* [PATCH v6 1/6] drm: Add SCDC helpers
2017-03-03 6:29 [PATCH v6 0/6] HDMI 2.0: Scrambling in DRM layer Shashank Sharma
@ 2017-03-03 6:29 ` Shashank Sharma
2017-03-03 6:29 ` [PATCH v6 2/6] drm/edid: check for HF-VSDB block Shashank Sharma
` (5 subsequent siblings)
6 siblings, 0 replies; 14+ messages in thread
From: Shashank Sharma @ 2017-03-03 6:29 UTC (permalink / raw)
To: dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, ander.conselvan.de.oliveira, daniel.vetter, treding
From: Thierry Reding <treding@nvidia.com>
SCDC is a mechanism defined in the HDMI 2.0 specification that allows
the source and sink devices to communicate.
This commit introduces helpers to access the SCDC and provides the
symbolic names for the various registers defined in the specification.
V2: Rebase.
V3: Added R-B from Jose.
V4: Rebase
V5: Addressed review comments from Ville
- Handle the I2c return values in a better way (dp_dual_mode)
- Make the macros for SCDC Major/Minor more readable, by adding
a 'GET' in the macro names
V6: Rebase
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
---
Documentation/gpu/drm-kms-helpers.rst | 12 ++++
drivers/gpu/drm/Makefile | 3 +-
drivers/gpu/drm/drm_scdc_helper.c | 123 +++++++++++++++++++++++++++++++
include/drm/drm_scdc_helper.h | 132 ++++++++++++++++++++++++++++++++++
4 files changed, 269 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/drm_scdc_helper.c
create mode 100644 include/drm/drm_scdc_helper.h
diff --git a/Documentation/gpu/drm-kms-helpers.rst b/Documentation/gpu/drm-kms-helpers.rst
index 03040aa..7592756 100644
--- a/Documentation/gpu/drm-kms-helpers.rst
+++ b/Documentation/gpu/drm-kms-helpers.rst
@@ -217,6 +217,18 @@ EDID Helper Functions Reference
.. kernel-doc:: drivers/gpu/drm/drm_edid.c
:export:
+SCDC Helper Functions Reference
+===============================
+
+.. kernel-doc:: drivers/gpu/drm/drm_scdc_helper.c
+ :doc: scdc helpers
+
+.. kernel-doc:: include/drm/drm_scdc_helper.h
+ :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_scdc_helper.c
+ :export:
+
Rectangle Utilities Reference
=============================
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 3ee9579..da5b08c 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -31,7 +31,8 @@ drm-$(CONFIG_DEBUG_FS) += drm_debugfs.o drm_debugfs_crc.o
drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
drm_kms_helper_common.o drm_dp_dual_mode_helper.o \
- drm_simple_kms_helper.o drm_modeset_helper.o
+ drm_simple_kms_helper.o drm_modeset_helper.o \
+ drm_scdc_helper.o
drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
drm_kms_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fb_helper.o
diff --git a/drivers/gpu/drm/drm_scdc_helper.c b/drivers/gpu/drm/drm_scdc_helper.c
new file mode 100644
index 0000000..c2dd33f
--- /dev/null
+++ b/drivers/gpu/drm/drm_scdc_helper.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2015 NVIDIA Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/slab.h>
+
+#include <drm/drm_scdc_helper.h>
+
+/**
+ * DOC: scdc helpers
+ *
+ * Status and Control Data Channel (SCDC) is a mechanism introduced by the
+ * HDMI 2.0 specification. It is a point-to-point protocol that allows the
+ * HDMI source and HDMI sink to exchange data. The same I2C interface that
+ * is used to access EDID serves as the transport mechanism for SCDC.
+ */
+
+#define SCDC_I2C_SLAVE_ADDRESS 0x54
+
+/**
+ * drm_scdc_read - read a block of data from SCDC
+ * @adapter: I2C controller
+ * @offset: start offset of block to read
+ * @buffer: return location for the block to read
+ * @size: size of the block to read
+ *
+ * Reads a block of data from SCDC, starting at a given offset.
+ *
+ * Returns:
+ * 0 on success, negative error code on failure.
+ */
+ssize_t drm_scdc_read(struct i2c_adapter *adapter, u8 offset, void *buffer,
+ size_t size)
+{
+ int ret;
+ struct i2c_msg msgs[2] = {
+ {
+ .addr = SCDC_I2C_SLAVE_ADDRESS,
+ .flags = 0,
+ .len = 1,
+ .buf = &offset,
+ }, {
+ .addr = SCDC_I2C_SLAVE_ADDRESS,
+ .flags = I2C_M_RD,
+ .len = size,
+ .buf = buffer,
+ }
+ };
+
+ ret = i2c_transfer(adapter, msgs, ARRAY_SIZE(msgs));
+ if (ret < 0)
+ return ret;
+ if (ret != ARRAY_SIZE(msgs))
+ return -EPROTO;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_scdc_read);
+
+/**
+ * drm_scdc_write - write a block of data to SCDC
+ * @adapter: I2C controller
+ * @offset: start offset of block to write
+ * @buffer: block of data to write
+ * @size: size of the block to write
+ *
+ * Writes a block of data to SCDC, starting at a given offset.
+ *
+ * Returns:
+ * 0 on success, negative error code on failure.
+ */
+ssize_t drm_scdc_write(struct i2c_adapter *adapter, u8 offset,
+ const void *buffer, size_t size)
+{
+ struct i2c_msg msg = {
+ .addr = SCDC_I2C_SLAVE_ADDRESS,
+ .flags = 0,
+ .len = 1 + size,
+ .buf = NULL,
+ };
+ void *data;
+ int err;
+
+ data = kmalloc(1 + size, GFP_TEMPORARY);
+ if (!data)
+ return -ENOMEM;
+
+ msg.buf = data;
+
+ memcpy(data, &offset, sizeof(offset));
+ memcpy(data + 1, buffer, size);
+
+ err = i2c_transfer(adapter, &msg, 1);
+
+ kfree(data);
+
+ if (err < 0)
+ return err;
+ if (err != 1)
+ return -EPROTO;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_scdc_write);
diff --git a/include/drm/drm_scdc_helper.h b/include/drm/drm_scdc_helper.h
new file mode 100644
index 0000000..9c52deb
--- /dev/null
+++ b/include/drm/drm_scdc_helper.h
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2015 NVIDIA Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef DRM_SCDC_HELPER_H
+#define DRM_SCDC_HELPER_H
+
+#include <linux/i2c.h>
+#include <linux/types.h>
+
+#define SCDC_SINK_VERSION 0x01
+
+#define SCDC_SOURCE_VERSION 0x02
+
+#define SCDC_UPDATE_0 0x10
+#define SCDC_READ_REQUEST_TEST (1 << 2)
+#define SCDC_CED_UPDATE (1 << 1)
+#define SCDC_STATUS_UPDATE (1 << 0)
+
+#define SCDC_UPDATE_1 0x11
+
+#define SCDC_TMDS_CONFIG 0x20
+#define SCDC_TMDS_BIT_CLOCK_RATIO_BY_40 (1 << 1)
+#define SCDC_TMDS_BIT_CLOCK_RATIO_BY_10 (0 << 1)
+#define SCDC_SCRAMBLING_ENABLE (1 << 0)
+
+#define SCDC_SCRAMBLER_STATUS 0x21
+#define SCDC_SCRAMBLING_STATUS (1 << 0)
+
+#define SCDC_CONFIG_0 0x30
+#define SCDC_READ_REQUEST_ENABLE (1 << 0)
+
+#define SCDC_STATUS_FLAGS_0 0x40
+#define SCDC_CH2_LOCK (1 < 3)
+#define SCDC_CH1_LOCK (1 < 2)
+#define SCDC_CH0_LOCK (1 < 1)
+#define SCDC_CH_LOCK_MASK (SCDC_CH2_LOCK | SCDC_CH1_LOCK | SCDC_CH0_LOCK)
+#define SCDC_CLOCK_DETECT (1 << 0)
+
+#define SCDC_STATUS_FLAGS_1 0x41
+
+#define SCDC_ERR_DET_0_L 0x50
+#define SCDC_ERR_DET_0_H 0x51
+#define SCDC_ERR_DET_1_L 0x52
+#define SCDC_ERR_DET_1_H 0x53
+#define SCDC_ERR_DET_2_L 0x54
+#define SCDC_ERR_DET_2_H 0x55
+#define SCDC_CHANNEL_VALID (1 << 7)
+
+#define SCDC_ERR_DET_CHECKSUM 0x56
+
+#define SCDC_TEST_CONFIG_0 0xc0
+#define SCDC_TEST_READ_REQUEST (1 << 7)
+#define SCDC_TEST_READ_REQUEST_DELAY(x) ((x) & 0x7f)
+
+#define SCDC_MANUFACTURER_IEEE_OUI 0xd0
+#define SCDC_MANUFACTURER_IEEE_OUI_SIZE 3
+
+#define SCDC_DEVICE_ID 0xd3
+#define SCDC_DEVICE_ID_SIZE 8
+
+#define SCDC_DEVICE_HARDWARE_REVISION 0xdb
+#define SCDC_GET_DEVICE_HARDWARE_REVISION_MAJOR(x) (((x) >> 4) & 0xf)
+#define SCDC_GET_DEVICE_HARDWARE_REVISION_MINOR(x) (((x) >> 0) & 0xf)
+
+#define SCDC_DEVICE_SOFTWARE_MAJOR_REVISION 0xdc
+#define SCDC_DEVICE_SOFTWARE_MINOR_REVISION 0xdd
+
+#define SCDC_MANUFACTURER_SPECIFIC 0xde
+#define SCDC_MANUFACTURER_SPECIFIC_SIZE 34
+
+ssize_t drm_scdc_read(struct i2c_adapter *adapter, u8 offset, void *buffer,
+ size_t size);
+ssize_t drm_scdc_write(struct i2c_adapter *adapter, u8 offset,
+ const void *buffer, size_t size);
+
+/**
+ * drm_scdc_readb - read a single byte from SCDC
+ * @adapter: I2C adapter
+ * @offset: offset of register to read
+ * @value: return location for the register value
+ *
+ * Reads a single byte from SCDC. This is a convenience wrapper around the
+ * drm_scdc_read() function.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+static inline int drm_scdc_readb(struct i2c_adapter *adapter, u8 offset,
+ u8 *value)
+{
+ return drm_scdc_read(adapter, offset, value, sizeof(*value));
+}
+
+/**
+ * drm_scdc_writeb - write a single byte to SCDC
+ * @adapter: I2C adapter
+ * @offset: offset of register to read
+ * @value: return location for the register value
+ *
+ * Writes a single byte to SCDC. This is a convenience wrapper around the
+ * drm_scdc_write() function.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+static inline int drm_scdc_writeb(struct i2c_adapter *adapter, u8 offset,
+ u8 value)
+{
+ return drm_scdc_write(adapter, offset, &value, sizeof(value));
+}
+
+#endif
--
1.9.1
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^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH v6 2/6] drm/edid: check for HF-VSDB block
2017-03-03 6:29 [PATCH v6 0/6] HDMI 2.0: Scrambling in DRM layer Shashank Sharma
2017-03-03 6:29 ` [PATCH v6 1/6] drm: Add SCDC helpers Shashank Sharma
@ 2017-03-03 6:29 ` Shashank Sharma
2017-03-03 6:29 ` [PATCH v6 3/6] drm/edid: detect SCDC support in HF-VSDB Shashank Sharma
` (4 subsequent siblings)
6 siblings, 0 replies; 14+ messages in thread
From: Shashank Sharma @ 2017-03-03 6:29 UTC (permalink / raw)
To: dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, ander.conselvan.de.oliveira, daniel.vetter, treding
From: Thierry Reding <treding@nvidia.com>
This patch implements a small function that finds if a
given CEA db is hdmi-forum vendor specific data block
or not.
V2: Rebase.
V3: Added R-B from Jose.
V4: Rebase
V5: Rebase
V6: Rebase
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
---
drivers/gpu/drm/drm_edid.c | 15 +++++++++++++++
include/linux/hdmi.h | 1 +
2 files changed, 16 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 5da5a85..3e0aafa 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3251,6 +3251,21 @@ static bool cea_db_is_hdmi_vsdb(const u8 *db)
return hdmi_id == HDMI_IEEE_OUI;
}
+static bool cea_db_is_hdmi_forum_vsdb(const u8 *db)
+{
+ unsigned int oui;
+
+ if (cea_db_tag(db) != VENDOR_BLOCK)
+ return false;
+
+ if (cea_db_payload_len(db) < 7)
+ return false;
+
+ oui = db[3] << 16 | db[2] << 8 | db[1];
+
+ return oui == HDMI_FORUM_IEEE_OUI;
+}
+
#define for_each_cea_db(cea, i, start, end) \
for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1)
diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
index edbb4fc..d271ff2 100644
--- a/include/linux/hdmi.h
+++ b/include/linux/hdmi.h
@@ -35,6 +35,7 @@ enum hdmi_infoframe_type {
};
#define HDMI_IEEE_OUI 0x000c03
+#define HDMI_FORUM_IEEE_OUI 0xc45dd8
#define HDMI_INFOFRAME_HEADER_SIZE 4
#define HDMI_AVI_INFOFRAME_SIZE 13
#define HDMI_SPD_INFOFRAME_SIZE 25
--
1.9.1
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^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH v6 3/6] drm/edid: detect SCDC support in HF-VSDB
2017-03-03 6:29 [PATCH v6 0/6] HDMI 2.0: Scrambling in DRM layer Shashank Sharma
2017-03-03 6:29 ` [PATCH v6 1/6] drm: Add SCDC helpers Shashank Sharma
2017-03-03 6:29 ` [PATCH v6 2/6] drm/edid: check for HF-VSDB block Shashank Sharma
@ 2017-03-03 6:29 ` Shashank Sharma
2017-03-03 10:14 ` Jose Abreu
2017-03-03 6:29 ` [PATCH v6 4/6] " Shashank Sharma
` (3 subsequent siblings)
6 siblings, 1 reply; 14+ messages in thread
From: Shashank Sharma @ 2017-03-03 6:29 UTC (permalink / raw)
To: dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, ander.conselvan.de.oliveira, daniel.vetter, treding
This patch does following:
- Adds a new structure (drm_hdmi_info) in drm_display_info.
This structure will be used to save and indicate if sink
supports advanced HDMI 2.0 features
- Adds another structure drm_scdc within drm_hdmi_info, to
reflect scdc support and capabilities in connected HDMI 2.0 sink.
- Checks the HF-VSDB block for presence of SCDC, and marks it
in scdc structure
- If SCDC is present, checks if sink is capable of generating
SCDC read request, and marks it in scdc structure.
V2: Addressed review comments
Thierry:
- Fix typos in commit message and make abbreviation consistent
across the commit message.
- Change structure object name from hdmi_info -> hdmi
- Fix typos and abbreviations in description of structure drm_hdmi_info
end the description with a full stop.
- Create a structure drm_scdc, and keep all information related to SCDC
register set (supported, read request supported) etc in it.
Ville:
- Change rr -> read_request
- Call drm_detect_scrambling function drm_parse_hf_vsdb so that all
of HF-VSDB parsing can be kept in same function, in incremental
patches.
V3: Rebase.
V4: Rebase.
V5: Rebase.
V6: Rebase.
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
---
drivers/gpu/drm/drm_edid.c | 14 ++++++++++++++
include/drm/drm_connector.h | 33 +++++++++++++++++++++++++++++++++
2 files changed, 47 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 3e0aafa..d64b7bd 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3817,6 +3817,18 @@ enum hdmi_quantization_range
}
EXPORT_SYMBOL(drm_default_rgb_quant_range);
+static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
+ const u8 *hf_vsdb)
+{
+ struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
+
+ if (hf_vsdb[6] & 0x80) {
+ hdmi->scdc.supported = true;
+ if (hf_vsdb[6] & 0x40)
+ hdmi->scdc.read_request = true;
+ }
+}
+
static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
const u8 *hdmi)
{
@@ -3931,6 +3943,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
if (cea_db_is_hdmi_vsdb(db))
drm_parse_hdmi_vsdb_video(connector, db);
+ if (cea_db_is_hdmi_forum_vsdb(db))
+ drm_parse_hdmi_forum_vsdb(connector, db);
}
}
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index fabb35a..bf9d6f5 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -87,6 +87,34 @@ enum subpixel_order {
SubPixelVerticalRGB,
SubPixelVerticalBGR,
SubPixelNone,
+
+};
+
+/*
+ * struct drm_scdc - Information about scdc capabilities of a HDMI 2.0 sink
+ *
+ * Provides SCDC register support and capabilities related information on a
+ * HDMI 2.0 sink. In case of a HDMI 1.4 sink, all parameter must be 0.
+ */
+struct drm_scdc {
+ /**
+ * @supported: status control & data channel present.
+ */
+ bool supported;
+ /**
+ * @read_request: sink is capable of generating scdc read request.
+ */
+ bool read_request;
+};
+
+/**
+ * struct drm_hdmi_info - runtime information about the connected HDMI sink
+ *
+ * Describes if a given display supports advanced HDMI 2.0 features.
+ * This information is available in CEA-861-F extension blocks (like HF-VSDB).
+ */
+struct drm_hdmi_info {
+ struct drm_scdc scdc;
};
/**
@@ -204,6 +232,11 @@ struct drm_display_info {
* @cea_rev: CEA revision of the HDMI sink.
*/
u8 cea_rev;
+
+ /**
+ * @hdmi: advance features of a HDMI sink.
+ */
+ struct drm_hdmi_info hdmi;
};
int drm_display_info_set_bus_formats(struct drm_display_info *info,
--
1.9.1
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^ permalink raw reply related [flat|nested] 14+ messages in thread* Re: [PATCH v6 3/6] drm/edid: detect SCDC support in HF-VSDB
2017-03-03 6:29 ` [PATCH v6 3/6] drm/edid: detect SCDC support in HF-VSDB Shashank Sharma
@ 2017-03-03 10:14 ` Jose Abreu
0 siblings, 0 replies; 14+ messages in thread
From: Jose Abreu @ 2017-03-03 10:14 UTC (permalink / raw)
To: Shashank Sharma, dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, ander.conselvan.de.oliveira, treding, daniel.vetter
Hi Shashank,
On 03-03-2017 06:29, Shashank Sharma wrote:
> This patch does following:
> - Adds a new structure (drm_hdmi_info) in drm_display_info.
> This structure will be used to save and indicate if sink
> supports advanced HDMI 2.0 features
> - Adds another structure drm_scdc within drm_hdmi_info, to
> reflect scdc support and capabilities in connected HDMI 2.0 sink.
> - Checks the HF-VSDB block for presence of SCDC, and marks it
> in scdc structure
> - If SCDC is present, checks if sink is capable of generating
> SCDC read request, and marks it in scdc structure.
>
> V2: Addressed review comments
> Thierry:
> - Fix typos in commit message and make abbreviation consistent
> across the commit message.
> - Change structure object name from hdmi_info -> hdmi
> - Fix typos and abbreviations in description of structure drm_hdmi_info
> end the description with a full stop.
> - Create a structure drm_scdc, and keep all information related to SCDC
> register set (supported, read request supported) etc in it.
>
> Ville:
> - Change rr -> read_request
> - Call drm_detect_scrambling function drm_parse_hf_vsdb so that all
> of HF-VSDB parsing can be kept in same function, in incremental
> patches.
>
> V3: Rebase.
> V4: Rebase.
> V5: Rebase.
> V6: Rebase.
>
> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
> Reviewed-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
Best regards,
Jose Miguel Abreu
> ---
> drivers/gpu/drm/drm_edid.c | 14 ++++++++++++++
> include/drm/drm_connector.h | 33 +++++++++++++++++++++++++++++++++
> 2 files changed, 47 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 3e0aafa..d64b7bd 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -3817,6 +3817,18 @@ enum hdmi_quantization_range
> }
> EXPORT_SYMBOL(drm_default_rgb_quant_range);
>
> +static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
> + const u8 *hf_vsdb)
> +{
> + struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
> +
> + if (hf_vsdb[6] & 0x80) {
> + hdmi->scdc.supported = true;
> + if (hf_vsdb[6] & 0x40)
> + hdmi->scdc.read_request = true;
> + }
> +}
> +
> static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
> const u8 *hdmi)
> {
> @@ -3931,6 +3943,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
>
> if (cea_db_is_hdmi_vsdb(db))
> drm_parse_hdmi_vsdb_video(connector, db);
> + if (cea_db_is_hdmi_forum_vsdb(db))
> + drm_parse_hdmi_forum_vsdb(connector, db);
> }
> }
>
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index fabb35a..bf9d6f5 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -87,6 +87,34 @@ enum subpixel_order {
> SubPixelVerticalRGB,
> SubPixelVerticalBGR,
> SubPixelNone,
> +
> +};
> +
> +/*
> + * struct drm_scdc - Information about scdc capabilities of a HDMI 2.0 sink
> + *
> + * Provides SCDC register support and capabilities related information on a
> + * HDMI 2.0 sink. In case of a HDMI 1.4 sink, all parameter must be 0.
> + */
> +struct drm_scdc {
> + /**
> + * @supported: status control & data channel present.
> + */
> + bool supported;
> + /**
> + * @read_request: sink is capable of generating scdc read request.
> + */
> + bool read_request;
> +};
> +
> +/**
> + * struct drm_hdmi_info - runtime information about the connected HDMI sink
> + *
> + * Describes if a given display supports advanced HDMI 2.0 features.
> + * This information is available in CEA-861-F extension blocks (like HF-VSDB).
> + */
> +struct drm_hdmi_info {
> + struct drm_scdc scdc;
> };
>
> /**
> @@ -204,6 +232,11 @@ struct drm_display_info {
> * @cea_rev: CEA revision of the HDMI sink.
> */
> u8 cea_rev;
> +
> + /**
> + * @hdmi: advance features of a HDMI sink.
> + */
> + struct drm_hdmi_info hdmi;
> };
>
> int drm_display_info_set_bus_formats(struct drm_display_info *info,
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^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH v6 4/6] drm/edid: detect SCDC support in HF-VSDB
2017-03-03 6:29 [PATCH v6 0/6] HDMI 2.0: Scrambling in DRM layer Shashank Sharma
` (2 preceding siblings ...)
2017-03-03 6:29 ` [PATCH v6 3/6] drm/edid: detect SCDC support in HF-VSDB Shashank Sharma
@ 2017-03-03 6:29 ` Shashank Sharma
2017-03-03 10:19 ` Jose Abreu
2017-03-03 6:29 ` [PATCH v6 5/6] drm/i915: enable scrambling Shashank Sharma
` (2 subsequent siblings)
6 siblings, 1 reply; 14+ messages in thread
From: Shashank Sharma @ 2017-03-03 6:29 UTC (permalink / raw)
To: dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, ander.conselvan.de.oliveira, daniel.vetter, treding
This patch does following:
- Adds a new structure (drm_hdmi_info) in drm_display_info.
This structure will be used to save and indicate if sink
supports advanced HDMI 2.0 features
- Adds another structure drm_scdc within drm_hdmi_info, to
reflect scdc support and capabilities in connected HDMI 2.0 sink.
- Checks the HF-VSDB block for presence of SCDC, and marks it
in scdc structure
- If SCDC is present, checks if sink is capable of generating
SCDC read request, and marks it in scdc structure.
V2: Addressed review comments
Thierry:
- Fix typos in commit message and make abbreviation consistent
across the commit message.
- Change structure object name from hdmi_info -> hdmi
- Fix typos and abbreviations in description of structure drm_hdmi_info
end the description with a full stop.
- Create a structure drm_scdc, and keep all information related to SCDC
register set (supported, read request supported) etc in it.
Ville:
- Change rr -> read_request
- Call drm_detect_scrambling function drm_parse_hf_vsdb so that all
of HF-VSDB parsing can be kept in same function, in incremental
patches.
V3: Rebase.
V4: Rebase.
V5: Rebase.
V6: Addressed review comments from Ville
- Add clock rate calculations for 1/10 and 1/40 ratios
- Remove leftovers from old patchset
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
---
drivers/gpu/drm/drm_edid.c | 33 ++++++++++-
drivers/gpu/drm/drm_scdc_helper.c | 121 ++++++++++++++++++++++++++++++++++++++
include/drm/drm_connector.h | 19 ++++++
include/drm/drm_edid.h | 1 -
include/drm/drm_scdc_helper.h | 27 +++++++++
5 files changed, 199 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index d64b7bd..fad3d44 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -37,6 +37,7 @@
#include <drm/drm_edid.h>
#include <drm/drm_encoder.h>
#include <drm/drm_displayid.h>
+#include <drm/drm_scdc_helper.h>
#include "drm_crtc_internal.h"
@@ -3820,13 +3821,43 @@ enum hdmi_quantization_range
static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
const u8 *hf_vsdb)
{
- struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
+ struct drm_display_info *display = &connector->display_info;
+ struct drm_hdmi_info *hdmi = &display->hdmi;
if (hf_vsdb[6] & 0x80) {
hdmi->scdc.supported = true;
if (hf_vsdb[6] & 0x40)
hdmi->scdc.read_request = true;
}
+
+ /*
+ * All HDMI 2.0 monitors must support scrambling at rates > 340 MHz.
+ * And as per the spec, three factors confirm this:
+ * * Availability of a HF-VSDB block in EDID (check)
+ * * Non zero Max_TMDS_Char_Rate filed in HF-VSDB (let's check)
+ * * SCDC support available (let's check)
+ * Lets check it out.
+ */
+
+ if (hf_vsdb[5]) {
+ /* max clock is 5000 KHz times block value */
+ u32 max_tmds_clock = hf_vsdb[5] * 5000;
+ struct drm_scdc *scdc = &hdmi->scdc;
+
+ if (max_tmds_clock > 340000) {
+ display->max_tmds_clock = max_tmds_clock;
+ DRM_DEBUG_KMS("HF-VSDB: max TMDS clock %d kHz\n",
+ display->max_tmds_clock);
+ }
+
+ if (scdc->supported) {
+ scdc->scrambling.supported = true;
+
+ /* Few sinks support scrambling for cloks < 340M */
+ if ((hf_vsdb[6] & 0x8))
+ scdc->scrambling.low_rates = true;
+ }
+ }
}
static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
diff --git a/drivers/gpu/drm/drm_scdc_helper.c b/drivers/gpu/drm/drm_scdc_helper.c
index c2dd33f..3cd96a9 100644
--- a/drivers/gpu/drm/drm_scdc_helper.c
+++ b/drivers/gpu/drm/drm_scdc_helper.c
@@ -22,8 +22,10 @@
*/
#include <linux/slab.h>
+#include <linux/delay.h>
#include <drm/drm_scdc_helper.h>
+#include <drm/drmP.h>
/**
* DOC: scdc helpers
@@ -121,3 +123,122 @@ ssize_t drm_scdc_write(struct i2c_adapter *adapter, u8 offset,
return 0;
}
EXPORT_SYMBOL(drm_scdc_write);
+
+/**
+ * drm_scdc_check_scrambling_status - what is status of scrambling?
+ * @adapter: I2C adapter for DDC channel
+ *
+ * Reads the scrambler status over SCDC, and checks the
+ * scrambling status.
+ *
+ * Returns:
+ * True if the scrambling is enabled, false otherwise.
+ */
+
+bool drm_scdc_get_scrambling_status(struct i2c_adapter *adapter)
+{
+ u8 status;
+ int ret;
+
+ ret = drm_scdc_readb(adapter, SCDC_SCRAMBLER_STATUS, &status);
+ if (ret < 0) {
+ DRM_ERROR("Failed to read scrambling status, error %d\n", ret);
+ return false;
+ }
+
+ return status & SCDC_SCRAMBLING_STATUS;
+}
+EXPORT_SYMBOL(drm_scdc_get_scrambling_status);
+
+/**
+ * drm_scdc_set_scrambling - enable scrambling
+ * @adapter: I2C adapter for DDC channel
+ * @enable: bool to indicate if scrambling is to be enabled/disabled
+ *
+ * Writes the TMDS config register over SCDC channel, and:
+ * enables scrambling when enable = 1
+ * disables scrambling when enable = 0
+ *
+ * Returns:
+ * True if scrambling is set/reset successfully, false otherwise.
+ */
+
+bool drm_scdc_set_scrambling(struct i2c_adapter *adapter, bool enable)
+{
+ u8 config;
+ int ret;
+
+ ret = drm_scdc_readb(adapter, SCDC_TMDS_CONFIG, &config);
+ if (ret < 0) {
+ DRM_ERROR("Failed to read tmds config, err=%d\n", ret);
+ return false;
+ }
+
+ if (enable)
+ config |= SCDC_SCRAMBLING_ENABLE;
+ else
+ config &= ~SCDC_SCRAMBLING_ENABLE;
+
+ ret = drm_scdc_writeb(adapter, SCDC_TMDS_CONFIG, config);
+ if (ret < 0) {
+ DRM_ERROR("Failed to enable scrambling, error %d\n", ret);
+ return false;
+ }
+
+ return true;
+}
+EXPORT_SYMBOL(drm_scdc_set_scrambling);
+
+/**
+ * drm_scdc_set_high_tmds_clock_ratio - set TMDS clock ratio
+ * @adapter: I2C adapter for DDC channel
+ * @set: ret or reset the high clock ratio
+ *
+ * TMDS clock ratio calculations go like this:
+ * TMDS character = 10 bit TMDS encoded value
+ * TMDS character rate = The rate at which TMDS characters are transmitted(Mcsc)
+ * TMDS bit rate = 10x TMDS character rate
+ * As per the spec:
+ * TMDS clock rate for pixel clock < 340 MHz = 1x the character rate
+ * = 1/10 pixel clock rate
+ * TMDS clock rate for pixel clock > 340 MHz = 0.25x the character rate
+ * = 1/40 pixel clock rate
+ *
+ * Writes to the TMDS config register over SCDC channel, and:
+ * sets TMDS clock ratio to 1/40 when set = 1
+ * sets TMDS clock ratio to 1/10 when set = 0
+ *
+ * Returns:
+ * True if write is successful, false otherwise.
+ */
+bool drm_scdc_set_high_tmds_clock_ratio(struct i2c_adapter *adapter, bool set)
+{
+ u8 config;
+ int ret;
+
+ ret = drm_scdc_readb(adapter, SCDC_TMDS_CONFIG, &config);
+ if (ret < 0) {
+ DRM_ERROR("Failed to read tmds config, err=%d\n", ret);
+ return false;
+ }
+
+ if (set)
+ config |= SCDC_TMDS_BIT_CLOCK_RATIO_BY_40;
+ else
+ config &= ~SCDC_TMDS_BIT_CLOCK_RATIO_BY_40;
+
+ ret = drm_scdc_writeb(adapter, SCDC_TMDS_CONFIG, config);
+ if (ret < 0) {
+ DRM_ERROR("Failed to set TMDS clock ratio, error %d\n", ret);
+ return false;
+ }
+
+ /*
+ * The spec says that a source should wait minimum 1ms and maximum
+ * 100ms after writing the TMDS config for clock ratio. Lets allow a
+ * wait of upto 2ms here.
+ */
+ usleep_range(1000, 2000);
+ return true;
+}
+EXPORT_SYMBOL(drm_scdc_set_high_tmds_clock_ratio);
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index bf9d6f5..f8b766d 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -90,6 +90,20 @@ enum subpixel_order {
};
+/**
+ * struct drm_scrambling: sink's scrambling support.
+ */
+struct drm_scrambling {
+ /**
+ * @supported: scrambling supported for rates > 340 Mhz.
+ */
+ bool supported;
+ /**
+ * @low_rates: scrambling supported for rates <= 340 Mhz.
+ */
+ bool low_rates;
+};
+
/*
* struct drm_scdc - Information about scdc capabilities of a HDMI 2.0 sink
*
@@ -105,8 +119,13 @@ struct drm_scdc {
* @read_request: sink is capable of generating scdc read request.
*/
bool read_request;
+ /**
+ * @scrambling: sink's scrambling capabilities
+ */
+ struct drm_scrambling scrambling;
};
+
/**
* struct drm_hdmi_info - runtime information about the connected HDMI sink
*
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 3ead84d..7b9f48b 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -476,5 +476,4 @@ void drm_edid_get_monitor_name(struct edid *edid, char *name,
struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
int hsize, int vsize, int fresh,
bool rb);
-
#endif /* __DRM_EDID_H__ */
diff --git a/include/drm/drm_scdc_helper.h b/include/drm/drm_scdc_helper.h
index 9c52deb..ab6bcfb 100644
--- a/include/drm/drm_scdc_helper.h
+++ b/include/drm/drm_scdc_helper.h
@@ -129,4 +129,31 @@ static inline int drm_scdc_writeb(struct i2c_adapter *adapter, u8 offset,
return drm_scdc_write(adapter, offset, &value, sizeof(value));
}
+/**
+ * drm_scdc_set_scrambling - enable scrambling
+ * @adapter: I2C adapter for DDC channel
+ * @enable: bool to indicate if scrambling is to be enabled/disabled
+ *
+ * Writes the TMDS config register over SCDC channel, and:
+ * enables scrambling when enable = 1
+ * disables scrambling when enable = 0
+ *
+ * Returns:
+ * True if scrambling is set/reset successfully, false otherwise.
+ */
+bool drm_scdc_set_scrambling(struct i2c_adapter *adapter, bool enable);
+
+/**
+ * drm_scdc_set_high_tmds_clock_ratio - set TMDS clock ratio
+ * @adapter: I2C adapter for DDC channel
+ * @set: ret or reset the high clock ratio
+ *
+ * Writes to the TMDS config register over SCDC channel, and:
+ * sets TMDS clock ratio to 1/40 when set = 1
+ * sets TMDS clock ratio to 1/10 when set = 0
+ *
+ * Returns:
+ * True if write is successful, false otherwise.
+ */
+bool drm_scdc_set_high_tmds_clock_ratio(struct i2c_adapter *adapter, bool set);
#endif
--
1.9.1
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^ permalink raw reply related [flat|nested] 14+ messages in thread* Re: [PATCH v6 4/6] drm/edid: detect SCDC support in HF-VSDB
2017-03-03 6:29 ` [PATCH v6 4/6] " Shashank Sharma
@ 2017-03-03 10:19 ` Jose Abreu
0 siblings, 0 replies; 14+ messages in thread
From: Jose Abreu @ 2017-03-03 10:19 UTC (permalink / raw)
To: Shashank Sharma, dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, ander.conselvan.de.oliveira, treding, daniel.vetter
Hi Shashank,
On 03-03-2017 06:29, Shashank Sharma wrote:
> This patch does following:
> - Adds a new structure (drm_hdmi_info) in drm_display_info.
> This structure will be used to save and indicate if sink
> supports advanced HDMI 2.0 features
> - Adds another structure drm_scdc within drm_hdmi_info, to
> reflect scdc support and capabilities in connected HDMI 2.0 sink.
> - Checks the HF-VSDB block for presence of SCDC, and marks it
> in scdc structure
> - If SCDC is present, checks if sink is capable of generating
> SCDC read request, and marks it in scdc structure.
>
> V2: Addressed review comments
> Thierry:
> - Fix typos in commit message and make abbreviation consistent
> across the commit message.
> - Change structure object name from hdmi_info -> hdmi
> - Fix typos and abbreviations in description of structure drm_hdmi_info
> end the description with a full stop.
> - Create a structure drm_scdc, and keep all information related to SCDC
> register set (supported, read request supported) etc in it.
>
> Ville:
> - Change rr -> read_request
> - Call drm_detect_scrambling function drm_parse_hf_vsdb so that all
> of HF-VSDB parsing can be kept in same function, in incremental
> patches.
>
> V3: Rebase.
> V4: Rebase.
> V5: Rebase.
> V6: Addressed review comments from Ville
> - Add clock rate calculations for 1/10 and 1/40 ratios
> - Remove leftovers from old patchset
>
> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
> Reviewed-by: Thierry Reding <treding@nvidia.com>
Maybe drm_scdc_set_scrambling() and
drm_scdc_set_high_tmds_clock_ratio() should return int error code
instead of bool, but anyway:
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
Best regards,
Jose Miguel Abreu
> ---
> drivers/gpu/drm/drm_edid.c | 33 ++++++++++-
> drivers/gpu/drm/drm_scdc_helper.c | 121 ++++++++++++++++++++++++++++++++++++++
> include/drm/drm_connector.h | 19 ++++++
> include/drm/drm_edid.h | 1 -
> include/drm/drm_scdc_helper.h | 27 +++++++++
> 5 files changed, 199 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index d64b7bd..fad3d44 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -37,6 +37,7 @@
> #include <drm/drm_edid.h>
> #include <drm/drm_encoder.h>
> #include <drm/drm_displayid.h>
> +#include <drm/drm_scdc_helper.h>
>
> #include "drm_crtc_internal.h"
>
> @@ -3820,13 +3821,43 @@ enum hdmi_quantization_range
> static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
> const u8 *hf_vsdb)
> {
> - struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
> + struct drm_display_info *display = &connector->display_info;
> + struct drm_hdmi_info *hdmi = &display->hdmi;
>
> if (hf_vsdb[6] & 0x80) {
> hdmi->scdc.supported = true;
> if (hf_vsdb[6] & 0x40)
> hdmi->scdc.read_request = true;
> }
> +
> + /*
> + * All HDMI 2.0 monitors must support scrambling at rates > 340 MHz.
> + * And as per the spec, three factors confirm this:
> + * * Availability of a HF-VSDB block in EDID (check)
> + * * Non zero Max_TMDS_Char_Rate filed in HF-VSDB (let's check)
> + * * SCDC support available (let's check)
> + * Lets check it out.
> + */
> +
> + if (hf_vsdb[5]) {
> + /* max clock is 5000 KHz times block value */
> + u32 max_tmds_clock = hf_vsdb[5] * 5000;
> + struct drm_scdc *scdc = &hdmi->scdc;
> +
> + if (max_tmds_clock > 340000) {
> + display->max_tmds_clock = max_tmds_clock;
> + DRM_DEBUG_KMS("HF-VSDB: max TMDS clock %d kHz\n",
> + display->max_tmds_clock);
> + }
> +
> + if (scdc->supported) {
> + scdc->scrambling.supported = true;
> +
> + /* Few sinks support scrambling for cloks < 340M */
> + if ((hf_vsdb[6] & 0x8))
> + scdc->scrambling.low_rates = true;
> + }
> + }
> }
>
> static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
> diff --git a/drivers/gpu/drm/drm_scdc_helper.c b/drivers/gpu/drm/drm_scdc_helper.c
> index c2dd33f..3cd96a9 100644
> --- a/drivers/gpu/drm/drm_scdc_helper.c
> +++ b/drivers/gpu/drm/drm_scdc_helper.c
> @@ -22,8 +22,10 @@
> */
>
> #include <linux/slab.h>
> +#include <linux/delay.h>
>
> #include <drm/drm_scdc_helper.h>
> +#include <drm/drmP.h>
>
> /**
> * DOC: scdc helpers
> @@ -121,3 +123,122 @@ ssize_t drm_scdc_write(struct i2c_adapter *adapter, u8 offset,
> return 0;
> }
> EXPORT_SYMBOL(drm_scdc_write);
> +
> +/**
> + * drm_scdc_check_scrambling_status - what is status of scrambling?
> + * @adapter: I2C adapter for DDC channel
> + *
> + * Reads the scrambler status over SCDC, and checks the
> + * scrambling status.
> + *
> + * Returns:
> + * True if the scrambling is enabled, false otherwise.
> + */
> +
> +bool drm_scdc_get_scrambling_status(struct i2c_adapter *adapter)
> +{
> + u8 status;
> + int ret;
> +
> + ret = drm_scdc_readb(adapter, SCDC_SCRAMBLER_STATUS, &status);
> + if (ret < 0) {
> + DRM_ERROR("Failed to read scrambling status, error %d\n", ret);
> + return false;
> + }
> +
> + return status & SCDC_SCRAMBLING_STATUS;
> +}
> +EXPORT_SYMBOL(drm_scdc_get_scrambling_status);
> +
> +/**
> + * drm_scdc_set_scrambling - enable scrambling
> + * @adapter: I2C adapter for DDC channel
> + * @enable: bool to indicate if scrambling is to be enabled/disabled
> + *
> + * Writes the TMDS config register over SCDC channel, and:
> + * enables scrambling when enable = 1
> + * disables scrambling when enable = 0
> + *
> + * Returns:
> + * True if scrambling is set/reset successfully, false otherwise.
> + */
> +
> +bool drm_scdc_set_scrambling(struct i2c_adapter *adapter, bool enable)
> +{
> + u8 config;
> + int ret;
> +
> + ret = drm_scdc_readb(adapter, SCDC_TMDS_CONFIG, &config);
> + if (ret < 0) {
> + DRM_ERROR("Failed to read tmds config, err=%d\n", ret);
> + return false;
> + }
> +
> + if (enable)
> + config |= SCDC_SCRAMBLING_ENABLE;
> + else
> + config &= ~SCDC_SCRAMBLING_ENABLE;
> +
> + ret = drm_scdc_writeb(adapter, SCDC_TMDS_CONFIG, config);
> + if (ret < 0) {
> + DRM_ERROR("Failed to enable scrambling, error %d\n", ret);
> + return false;
> + }
> +
> + return true;
> +}
> +EXPORT_SYMBOL(drm_scdc_set_scrambling);
> +
> +/**
> + * drm_scdc_set_high_tmds_clock_ratio - set TMDS clock ratio
> + * @adapter: I2C adapter for DDC channel
> + * @set: ret or reset the high clock ratio
> + *
> + * TMDS clock ratio calculations go like this:
> + * TMDS character = 10 bit TMDS encoded value
> + * TMDS character rate = The rate at which TMDS characters are transmitted(Mcsc)
> + * TMDS bit rate = 10x TMDS character rate
> + * As per the spec:
> + * TMDS clock rate for pixel clock < 340 MHz = 1x the character rate
> + * = 1/10 pixel clock rate
> + * TMDS clock rate for pixel clock > 340 MHz = 0.25x the character rate
> + * = 1/40 pixel clock rate
> + *
> + * Writes to the TMDS config register over SCDC channel, and:
> + * sets TMDS clock ratio to 1/40 when set = 1
> + * sets TMDS clock ratio to 1/10 when set = 0
> + *
> + * Returns:
> + * True if write is successful, false otherwise.
> + */
> +bool drm_scdc_set_high_tmds_clock_ratio(struct i2c_adapter *adapter, bool set)
> +{
> + u8 config;
> + int ret;
> +
> + ret = drm_scdc_readb(adapter, SCDC_TMDS_CONFIG, &config);
> + if (ret < 0) {
> + DRM_ERROR("Failed to read tmds config, err=%d\n", ret);
> + return false;
> + }
> +
> + if (set)
> + config |= SCDC_TMDS_BIT_CLOCK_RATIO_BY_40;
> + else
> + config &= ~SCDC_TMDS_BIT_CLOCK_RATIO_BY_40;
> +
> + ret = drm_scdc_writeb(adapter, SCDC_TMDS_CONFIG, config);
> + if (ret < 0) {
> + DRM_ERROR("Failed to set TMDS clock ratio, error %d\n", ret);
> + return false;
> + }
> +
> + /*
> + * The spec says that a source should wait minimum 1ms and maximum
> + * 100ms after writing the TMDS config for clock ratio. Lets allow a
> + * wait of upto 2ms here.
> + */
> + usleep_range(1000, 2000);
> + return true;
> +}
> +EXPORT_SYMBOL(drm_scdc_set_high_tmds_clock_ratio);
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index bf9d6f5..f8b766d 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -90,6 +90,20 @@ enum subpixel_order {
>
> };
>
> +/**
> + * struct drm_scrambling: sink's scrambling support.
> + */
> +struct drm_scrambling {
> + /**
> + * @supported: scrambling supported for rates > 340 Mhz.
> + */
> + bool supported;
> + /**
> + * @low_rates: scrambling supported for rates <= 340 Mhz.
> + */
> + bool low_rates;
> +};
> +
> /*
> * struct drm_scdc - Information about scdc capabilities of a HDMI 2.0 sink
> *
> @@ -105,8 +119,13 @@ struct drm_scdc {
> * @read_request: sink is capable of generating scdc read request.
> */
> bool read_request;
> + /**
> + * @scrambling: sink's scrambling capabilities
> + */
> + struct drm_scrambling scrambling;
> };
>
> +
> /**
> * struct drm_hdmi_info - runtime information about the connected HDMI sink
> *
> diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
> index 3ead84d..7b9f48b 100644
> --- a/include/drm/drm_edid.h
> +++ b/include/drm/drm_edid.h
> @@ -476,5 +476,4 @@ void drm_edid_get_monitor_name(struct edid *edid, char *name,
> struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
> int hsize, int vsize, int fresh,
> bool rb);
> -
> #endif /* __DRM_EDID_H__ */
> diff --git a/include/drm/drm_scdc_helper.h b/include/drm/drm_scdc_helper.h
> index 9c52deb..ab6bcfb 100644
> --- a/include/drm/drm_scdc_helper.h
> +++ b/include/drm/drm_scdc_helper.h
> @@ -129,4 +129,31 @@ static inline int drm_scdc_writeb(struct i2c_adapter *adapter, u8 offset,
> return drm_scdc_write(adapter, offset, &value, sizeof(value));
> }
>
> +/**
> + * drm_scdc_set_scrambling - enable scrambling
> + * @adapter: I2C adapter for DDC channel
> + * @enable: bool to indicate if scrambling is to be enabled/disabled
> + *
> + * Writes the TMDS config register over SCDC channel, and:
> + * enables scrambling when enable = 1
> + * disables scrambling when enable = 0
> + *
> + * Returns:
> + * True if scrambling is set/reset successfully, false otherwise.
> + */
> +bool drm_scdc_set_scrambling(struct i2c_adapter *adapter, bool enable);
> +
> +/**
> + * drm_scdc_set_high_tmds_clock_ratio - set TMDS clock ratio
> + * @adapter: I2C adapter for DDC channel
> + * @set: ret or reset the high clock ratio
> + *
> + * Writes to the TMDS config register over SCDC channel, and:
> + * sets TMDS clock ratio to 1/40 when set = 1
> + * sets TMDS clock ratio to 1/10 when set = 0
> + *
> + * Returns:
> + * True if write is successful, false otherwise.
> + */
> +bool drm_scdc_set_high_tmds_clock_ratio(struct i2c_adapter *adapter, bool set);
> #endif
_______________________________________________
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https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH v6 5/6] drm/i915: enable scrambling
2017-03-03 6:29 [PATCH v6 0/6] HDMI 2.0: Scrambling in DRM layer Shashank Sharma
` (3 preceding siblings ...)
2017-03-03 6:29 ` [PATCH v6 4/6] " Shashank Sharma
@ 2017-03-03 6:29 ` Shashank Sharma
2017-03-03 9:52 ` [Intel-gfx] " Ander Conselvan De Oliveira
2017-03-03 6:29 ` [PATCH v6 6/6] drm/i915: allow HDMI 2.0 clock rates Shashank Sharma
2017-03-03 6:47 ` ✓ Fi.CI.BAT: success for HDMI 2.0: Scrambling in DRM layer (rev6) Patchwork
6 siblings, 1 reply; 14+ messages in thread
From: Shashank Sharma @ 2017-03-03 6:29 UTC (permalink / raw)
To: dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, ander.conselvan.de.oliveira, daniel.vetter, treding
Geminilake platform sports a native HDMI 2.0 controller, and is
capable of driving pixel-clocks upto 594Mhz. HDMI 2.0 spec
mendates scrambling for these higher clocks, for reduced RF footprint.
This patch checks if the monitor supports scrambling, and if required,
enables it during the modeset.
V2: Addressed review comments from Ville:
- Do not track scrambling status in DRM layer, track somewhere in
driver like in intel_crtc_state.
- Don't talk to monitor at such a low layer, set monitor scrambling
in intel_enable_ddi() before enabling the port.
V3: Addressed review comments from Jani
- In comments, function names, use "sink" instead of "monitor",
so that the implementation could be close to the language of
HDMI spec.
V4: Addressed review comment from Maarten
- scrambling -> hdmi_scrambling
high_tmds_clock_ratio -> hdmi_high_tmds_clock_ratio
V5: Addressed review comments from Ville and Ander
- Do not modifiy the crtc_state after compute_config. Move all
scrambling and tmds_clock_ratio calcutations to compute_config.
- While setting scrambling for source/sink, do not check the
conditions again, just go by the crtc_state flags. This will
simplyfy the condition checks.
V6: Addressed review comments from Ville
- Do not add IS_GLK check in disable/enable function, instead add it
in compute_config, while setting state flags.
- Remove unnecessary paranthesis.
- Simplyfy handle_sink_scrambling function as suggested.
- Add readout code for scrambling status in get_ddi_config and add a
check for the same in pipe_config_compare.
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 7 ++++
drivers/gpu/drm/i915/intel_ddi.c | 33 ++++++++++++++++
drivers/gpu/drm/i915/intel_display.c | 5 +++
drivers/gpu/drm/i915/intel_drv.h | 14 +++++++
drivers/gpu/drm/i915/intel_hdmi.c | 74 ++++++++++++++++++++++++++++++++++++
5 files changed, 133 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 4906ce4d..f7891ac 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7824,7 +7824,14 @@ enum {
#define TRANS_DDI_EDP_INPUT_B_ONOFF (5<<12)
#define TRANS_DDI_EDP_INPUT_C_ONOFF (6<<12)
#define TRANS_DDI_DP_VC_PAYLOAD_ALLOC (1<<8)
+#define TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE (1<<7)
+#define TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ (1<<6)
#define TRANS_DDI_BFI_ENABLE (1<<4)
+#define TRANS_DDI_HIGH_TMDS_CHAR_RATE (1<<4)
+#define TRANS_DDI_HDMI_SCRAMBLING (1<<0)
+#define TRANS_DDI_HDMI_SCRAMBLING_MASK (TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE \
+ | TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ \
+ | TRANS_DDI_HDMI_SCRAMBLING)
/* DisplayPort Transport Control */
#define _DP_TP_CTL_A 0x64040
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index a7c08d7..d0c6927 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1311,6 +1311,11 @@ void intel_ddi_enable_transcoder_func(struct drm_crtc *crtc)
temp |= TRANS_DDI_MODE_SELECT_HDMI;
else
temp |= TRANS_DDI_MODE_SELECT_DVI;
+
+ if (IS_GEMINILAKE(dev_priv))
+ temp = intel_hdmi_handle_source_scrambling(
+ intel_encoder,
+ intel_crtc->config, temp);
} else if (type == INTEL_OUTPUT_ANALOG) {
temp |= TRANS_DDI_MODE_SELECT_FDI;
temp |= (intel_crtc->config->fdi_lanes - 1) << 1;
@@ -1885,6 +1890,21 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder,
struct intel_digital_port *intel_dig_port =
enc_to_dig_port(encoder);
+ if (IS_GEMINILAKE(dev_priv)) {
+ struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
+ /*
+ * GLK sports a native HDMI 2.0 controller. If required
+ * clock rate is > 340 Mhz && scrambling is supported
+ * by sink, enable scrambling before enabling the
+ * HDMI 2.0 port. The sink can choose to disable the
+ * scrambling if it doesn't detect a scrambled within
+ * 100 ms.
+ */
+ intel_hdmi_handle_sink_scrambling(intel_encoder,
+ conn_state->connector,
+ crtc->config, true);
+ }
+
/* In HDMI/DVI mode, the port width, and swing/emphasis values
* are ignored so nothing special needs to be done besides
* enabling the port.
@@ -1917,6 +1937,14 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder,
if (old_crtc_state->has_audio)
intel_audio_codec_disable(intel_encoder);
+ if (type == INTEL_OUTPUT_HDMI) {
+ struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+
+ intel_hdmi_handle_sink_scrambling(intel_encoder,
+ old_conn_state->connector,
+ intel_crtc->config, false);
+ }
+
if (type == INTEL_OUTPUT_EDP) {
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
@@ -2044,6 +2072,11 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
if (intel_hdmi->infoframe_enabled(&encoder->base, pipe_config))
pipe_config->has_infoframe = true;
+
+ if (temp & TRANS_DDI_HDMI_SCRAMBLING_MASK)
+ pipe_config->hdmi_scrambling = true;
+ if (temp & TRANS_DDI_HIGH_TMDS_CHAR_RATE)
+ pipe_config->hdmi_high_tmds_clock_ratio = true;
/* fall through */
case TRANS_DDI_MODE_SELECT_DVI:
pipe_config->lane_count = 4;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 99e8d9c..c017ed3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11662,6 +11662,11 @@ static void __printf(3, 4)
if ((INTEL_GEN(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
PIPE_CONF_CHECK_I(limited_color_range);
+ if (IS_GEMINILAKE(dev_priv)) {
+ PIPE_CONF_CHECK_I(hdmi_scrambling);
+ PIPE_CONF_CHECK_I(hdmi_high_tmds_clock_ratio);
+ }
+
PIPE_CONF_CHECK_I(has_infoframe);
PIPE_CONF_CHECK_I(has_audio);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index e6fbbee..baefbaa 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -695,6 +695,12 @@ struct intel_crtc_state {
/* Gamma mode programmed on the pipe */
uint32_t gamma_mode;
+
+ /* HDMI scrambling status (sink) */
+ bool hdmi_scrambling;
+
+ /* HDMI High TMDS char rate ratio (sink) */
+ bool hdmi_high_tmds_clock_ratio;
};
struct vlv_wm_state {
@@ -1626,6 +1632,14 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
bool intel_hdmi_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state);
+uint32_t
+intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
+ struct intel_crtc_state *config,
+ uint32_t hdmi_config);
+void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
+ struct drm_connector *connector,
+ struct intel_crtc_state *config,
+ bool enable);
void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable);
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index c2184f7..0a1ae03 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -34,6 +34,7 @@
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
+#include <drm/drm_scdc_helper.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include <drm/intel_lpe_audio.h>
@@ -1316,6 +1317,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
+ struct drm_scdc *scdc = &conn_state->connector->display_info.hdmi.scdc;
int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
int clock_12bpc = clock_8bpc * 3 / 2;
int desired_bpp;
@@ -1385,6 +1387,16 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
pipe_config->lane_count = 4;
+ if (scdc->scrambling.supported && IS_GEMINILAKE(dev_priv)) {
+ if (scdc->scrambling.low_rates)
+ pipe_config->hdmi_scrambling = true;
+
+ if (pipe_config->port_clock > 340000) {
+ pipe_config->hdmi_scrambling = true;
+ pipe_config->hdmi_high_tmds_clock_ratio = true;
+ }
+ }
+
return true;
}
@@ -1794,6 +1806,68 @@ static void intel_hdmi_destroy(struct drm_connector *connector)
intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
}
+void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
+ struct drm_connector *connector,
+ struct intel_crtc_state *config,
+ bool enable)
+{
+ struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
+ struct drm_i915_private *dev_priv = connector->dev->dev_private;
+ struct drm_scrambling *scrambling =
+ &connector->display_info.hdmi.scdc.scrambling;
+ struct i2c_adapter *adptr = intel_gmbus_get_adapter(dev_priv,
+ intel_hdmi->ddc_bus);
+ bool ret;
+
+ if (!scrambling->supported)
+ return;
+
+ DRM_DEBUG_KMS("Setting sink scrambling for enc:%s connector:%s\n",
+ intel_encoder->base.name, connector->name);
+
+ if (config->hdmi_high_tmds_clock_ratio) {
+ /* Set TMDS bit clock ratio to 1/40 or 1/10 */
+ ret = drm_scdc_set_high_tmds_clock_ratio(adptr, enable);
+ if (!ret) {
+ DRM_ERROR("Set TMDS ratio failed\n");
+ return;
+ }
+ }
+
+ if (config->hdmi_scrambling) {
+ /* Enable/disable sink scrambling */
+ ret = drm_scdc_set_scrambling(adptr, enable);
+ if (!ret) {
+ DRM_ERROR("Set sink scrambling failed\n");
+ return;
+ }
+ }
+
+ DRM_DEBUG_KMS("sink scrambling handled\n");
+}
+
+uint32_t
+intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
+ struct intel_crtc_state *config, uint32_t hdmi_config)
+{
+ struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
+ struct drm_connector *connector = &intel_hdmi->attached_connector->base;
+
+ DRM_DEBUG_KMS("Setting scrambling for enc:%s connector:%s\n",
+ intel_encoder->base.name, connector->name);
+
+ hdmi_config &= ~(TRANS_DDI_HDMI_SCRAMBLING_MASK |
+ TRANS_DDI_HIGH_TMDS_CHAR_RATE);
+
+ if (config->hdmi_scrambling)
+ hdmi_config |= TRANS_DDI_HDMI_SCRAMBLING_MASK;
+
+ if (config->hdmi_high_tmds_clock_ratio)
+ hdmi_config |= TRANS_DDI_HIGH_TMDS_CHAR_RATE;
+
+ return hdmi_config;
+}
+
static u8 intel_hdmi_ddc_pin(struct drm_i915_private *dev_priv,
enum port port)
{
--
1.9.1
_______________________________________________
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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply related [flat|nested] 14+ messages in thread* Re: [Intel-gfx] [PATCH v6 5/6] drm/i915: enable scrambling
2017-03-03 6:29 ` [PATCH v6 5/6] drm/i915: enable scrambling Shashank Sharma
@ 2017-03-03 9:52 ` Ander Conselvan De Oliveira
2017-03-03 12:03 ` Sharma, Shashank
0 siblings, 1 reply; 14+ messages in thread
From: Ander Conselvan De Oliveira @ 2017-03-03 9:52 UTC (permalink / raw)
To: Shashank Sharma, dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, daniel.vetter, treding
On Fri, 2017-03-03 at 11:59 +0530, Shashank Sharma wrote:
> Geminilake platform sports a native HDMI 2.0 controller, and is
> capable of driving pixel-clocks upto 594Mhz. HDMI 2.0 spec
> mendates scrambling for these higher clocks, for reduced RF footprint.
>
> This patch checks if the monitor supports scrambling, and if required,
> enables it during the modeset.
>
> V2: Addressed review comments from Ville:
> - Do not track scrambling status in DRM layer, track somewhere in
> driver like in intel_crtc_state.
> - Don't talk to monitor at such a low layer, set monitor scrambling
> in intel_enable_ddi() before enabling the port.
>
> V3: Addressed review comments from Jani
> - In comments, function names, use "sink" instead of "monitor",
> so that the implementation could be close to the language of
> HDMI spec.
>
> V4: Addressed review comment from Maarten
> - scrambling -> hdmi_scrambling
> high_tmds_clock_ratio -> hdmi_high_tmds_clock_ratio
>
> V5: Addressed review comments from Ville and Ander
> - Do not modifiy the crtc_state after compute_config. Move all
> scrambling and tmds_clock_ratio calcutations to compute_config.
> - While setting scrambling for source/sink, do not check the
> conditions again, just go by the crtc_state flags. This will
> simplyfy the condition checks.
>
> V6: Addressed review comments from Ville
> - Do not add IS_GLK check in disable/enable function, instead add it
> in compute_config, while setting state flags.
> - Remove unnecessary paranthesis.
> - Simplyfy handle_sink_scrambling function as suggested.
> - Add readout code for scrambling status in get_ddi_config and add a
> check for the same in pipe_config_compare.
>
> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 7 ++++
> drivers/gpu/drm/i915/intel_ddi.c | 33 ++++++++++++++++
> drivers/gpu/drm/i915/intel_display.c | 5 +++
> drivers/gpu/drm/i915/intel_drv.h | 14 +++++++
> drivers/gpu/drm/i915/intel_hdmi.c | 74 ++++++++++++++++++++++++++++++++++++
> 5 files changed, 133 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 4906ce4d..f7891ac 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -7824,7 +7824,14 @@ enum {
> #define TRANS_DDI_EDP_INPUT_B_ONOFF (5<<12)
> #define TRANS_DDI_EDP_INPUT_C_ONOFF (6<<12)
> #define TRANS_DDI_DP_VC_PAYLOAD_ALLOC (1<<8)
> +#define TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE (1<<7)
> +#define TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ (1<<6)
> #define TRANS_DDI_BFI_ENABLE (1<<4)
> +#define TRANS_DDI_HIGH_TMDS_CHAR_RATE (1<<4)
> +#define TRANS_DDI_HDMI_SCRAMBLING (1<<0)
> +#define TRANS_DDI_HDMI_SCRAMBLING_MASK (TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE \
> + | TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ \
> + | TRANS_DDI_HDMI_SCRAMBLING)
Last line is misaligned.
>
> /* DisplayPort Transport Control */
> #define _DP_TP_CTL_A 0x64040
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index a7c08d7..d0c6927 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1311,6 +1311,11 @@ void intel_ddi_enable_transcoder_func(struct drm_crtc *crtc)
> temp |= TRANS_DDI_MODE_SELECT_HDMI;
> else
> temp |= TRANS_DDI_MODE_SELECT_DVI;
> +
> + if (IS_GEMINILAKE(dev_priv))
> + temp = intel_hdmi_handle_source_scrambling(
> + intel_encoder,
> + intel_crtc->config, temp);
This whole hunk could just be:
+ if (config->hdmi_scrambling)
+ hdmi_config |= TRANS_DDI_HDMI_SCRAMBLING_MASK;
+
+ if (config->hdmi_high_tmds_clock_ratio)
+ hdmi_config |= TRANS_DDI_HIGH_TMDS_CHAR_RATE;
No need to check for GLK here, since the compute config code already did.
> } else if (type == INTEL_OUTPUT_ANALOG) {
> temp |= TRANS_DDI_MODE_SELECT_FDI;
> temp |= (intel_crtc->config->fdi_lanes - 1) << 1;
> @@ -1885,6 +1890,21 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder,
> struct intel_digital_port *intel_dig_port =
> enc_to_dig_port(encoder);
>
> + if (IS_GEMINILAKE(dev_priv)) {
> + struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
> + /*
> + * GLK sports a native HDMI 2.0 controller. If required
> + * clock rate is > 340 Mhz && scrambling is supported
> + * by sink, enable scrambling before enabling the
> + * HDMI 2.0 port. The sink can choose to disable the
> + * scrambling if it doesn't detect a scrambled within
> + * 100 ms.
> + */
> + intel_hdmi_handle_sink_scrambling(intel_encoder,
> + conn_state->connector,
> + crtc->config, true);
This function receives a pipe_config pointer as argument. Use that instead of
crtc->config.
> + }
> +
> /* In HDMI/DVI mode, the port width, and swing/emphasis values
> * are ignored so nothing special needs to be done besides
> * enabling the port.
> @@ -1917,6 +1937,14 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder,
> if (old_crtc_state->has_audio)
> intel_audio_codec_disable(intel_encoder);
>
> + if (type == INTEL_OUTPUT_HDMI) {
> + struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +
> + intel_hdmi_handle_sink_scrambling(intel_encoder,
> + old_conn_state->connector,
> + intel_crtc->config, false);
> + }
> +
> if (type == INTEL_OUTPUT_EDP) {
> struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
>
> @@ -2044,6 +2072,11 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
>
> if (intel_hdmi->infoframe_enabled(&encoder->base, pipe_config))
> pipe_config->has_infoframe = true;
> +
> + if (temp & TRANS_DDI_HDMI_SCRAMBLING_MASK)
> + pipe_config->hdmi_scrambling = true;
> + if (temp & TRANS_DDI_HIGH_TMDS_CHAR_RATE)
> + pipe_config->hdmi_high_tmds_clock_ratio = true;
Hmm, we might need a IS_GLK here, since these bits only exist in that platform.
I believe they should read zero though, since they are listed are reserved.
Dunno.
> /* fall through */
> case TRANS_DDI_MODE_SELECT_DVI:
> pipe_config->lane_count = 4;
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 99e8d9c..c017ed3 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11662,6 +11662,11 @@ static void __printf(3, 4)
> if ((INTEL_GEN(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
> IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> PIPE_CONF_CHECK_I(limited_color_range);
> + if (IS_GEMINILAKE(dev_priv)) {
No need to check for GLK here. The configuration should never be set for other
platforms. If it is set, that's a bug and we want verify_crtc_state() to tells
us about it.
> + PIPE_CONF_CHECK_I(hdmi_scrambling);
> + PIPE_CONF_CHECK_I(hdmi_high_tmds_clock_ratio);
> + }
> +
> PIPE_CONF_CHECK_I(has_infoframe);
>
> PIPE_CONF_CHECK_I(has_audio);
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index e6fbbee..baefbaa 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -695,6 +695,12 @@ struct intel_crtc_state {
>
> /* Gamma mode programmed on the pipe */
> uint32_t gamma_mode;
> +
> + /* HDMI scrambling status (sink) */
> + bool hdmi_scrambling;
> +
> + /* HDMI High TMDS char rate ratio (sink) */
> + bool hdmi_high_tmds_clock_ratio;
> };
>
> struct vlv_wm_state {
> @@ -1626,6 +1632,14 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
> bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> struct intel_crtc_state *pipe_config,
> struct drm_connector_state *conn_state);
> +uint32_t
> +intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
> + struct intel_crtc_state *config,
> + uint32_t hdmi_config);
> +void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
> + struct drm_connector *connector,
> + struct intel_crtc_state *config,
> + bool enable);
> void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable);
>
>
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index c2184f7..0a1ae03 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -34,6 +34,7 @@
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_crtc.h>
> #include <drm/drm_edid.h>
> +#include <drm/drm_scdc_helper.h>
> #include "intel_drv.h"
> #include <drm/i915_drm.h>
> #include <drm/intel_lpe_audio.h>
> @@ -1316,6 +1317,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> + struct drm_scdc *scdc = &conn_state->connector->display_info.hdmi.scdc;
> int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
> int clock_12bpc = clock_8bpc * 3 / 2;
> int desired_bpp;
> @@ -1385,6 +1387,16 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
>
> pipe_config->lane_count = 4;
>
> + if (scdc->scrambling.supported && IS_GEMINILAKE(dev_priv)) {
> + if (scdc->scrambling.low_rates)
> + pipe_config->hdmi_scrambling = true;
> +
> + if (pipe_config->port_clock > 340000) {
> + pipe_config->hdmi_scrambling = true;
> + pipe_config->hdmi_high_tmds_clock_ratio = true;
> + }
> + }
> +
> return true;
> }
>
> @@ -1794,6 +1806,68 @@ static void intel_hdmi_destroy(struct drm_connector *connector)
> intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
> }
>
> +void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
> + struct drm_connector *connector,
> + struct intel_crtc_state *config,
> + bool enable)
> +{
> + struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
> + struct drm_i915_private *dev_priv = connector->dev->dev_private;
> + struct drm_scrambling *scrambling =
> + &connector->display_info.hdmi.scdc.scrambling;
> + struct i2c_adapter *adptr = intel_gmbus_get_adapter(dev_priv,
> + intel_hdmi->ddc_bus);
> + bool ret;
> +
> + if (!scrambling->supported)
> + return;
> +
> + DRM_DEBUG_KMS("Setting sink scrambling for enc:%s connector:%s\n",
> + intel_encoder->base.name, connector->name);
> +
> + if (config->hdmi_high_tmds_clock_ratio) {
> + /* Set TMDS bit clock ratio to 1/40 or 1/10 */
> + ret = drm_scdc_set_high_tmds_clock_ratio(adptr, enable);
> + if (!ret) {
> + DRM_ERROR("Set TMDS ratio failed\n");
> + return;
> + }
> + }
> +
> + if (config->hdmi_scrambling) {
> + /* Enable/disable sink scrambling */
> + ret = drm_scdc_set_scrambling(adptr, enable);
> + if (!ret) {
> + DRM_ERROR("Set sink scrambling failed\n");
> + return;
> + }
> + }
> +
> + DRM_DEBUG_KMS("sink scrambling handled\n");
> +}
> +
> +uint32_t
> +intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
> + struct intel_crtc_state *config, uint32_t hdmi_config)
> +{
> + struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
> + struct drm_connector *connector = &intel_hdmi->attached_connector->base;
> +
> + DRM_DEBUG_KMS("Setting scrambling for enc:%s connector:%s\n",
> + intel_encoder->base.name, connector->name);
Instead of debugging here, print the hdmi scrambling values in
intel_dump_pipe_config().
> + hdmi_config &= ~(TRANS_DDI_HDMI_SCRAMBLING_MASK |
> + TRANS_DDI_HIGH_TMDS_CHAR_RATE);
This is unnecessary. The hunk below belongs in
intel_ddi_enable_transcoder_func() and that function does not do read-modify-
write. Any bit that is not explicitly set is zero. I think things are just
simpler if this function doesn't exist.
Ander
> + if (config->hdmi_scrambling)
> + hdmi_config |= TRANS_DDI_HDMI_SCRAMBLING_MASK;
> +
> + if (config->hdmi_high_tmds_clock_ratio)
> + hdmi_config |= TRANS_DDI_HIGH_TMDS_CHAR_RATE;
> +
> + return hdmi_config;
> +}
> +
> static u8 intel_hdmi_ddc_pin(struct drm_i915_private *dev_priv,
> enum port port)
> {
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^ permalink raw reply [flat|nested] 14+ messages in thread* Re: [PATCH v6 5/6] drm/i915: enable scrambling
2017-03-03 9:52 ` [Intel-gfx] " Ander Conselvan De Oliveira
@ 2017-03-03 12:03 ` Sharma, Shashank
2017-03-03 13:01 ` [Intel-gfx] " Ander Conselvan De Oliveira
0 siblings, 1 reply; 14+ messages in thread
From: Sharma, Shashank @ 2017-03-03 12:03 UTC (permalink / raw)
To: Ander Conselvan De Oliveira, dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, daniel.vetter, treding
Thanks for the review Ander. My comments inline.
Shashank
On 3/3/2017 3:22 PM, Ander Conselvan De Oliveira wrote:
> On Fri, 2017-03-03 at 11:59 +0530, Shashank Sharma wrote:
>> Geminilake platform sports a native HDMI 2.0 controller, and is
>> capable of driving pixel-clocks upto 594Mhz. HDMI 2.0 spec
>> mendates scrambling for these higher clocks, for reduced RF footprint.
>>
>> This patch checks if the monitor supports scrambling, and if required,
>> enables it during the modeset.
>>
>> V2: Addressed review comments from Ville:
>> - Do not track scrambling status in DRM layer, track somewhere in
>> driver like in intel_crtc_state.
>> - Don't talk to monitor at such a low layer, set monitor scrambling
>> in intel_enable_ddi() before enabling the port.
>>
>> V3: Addressed review comments from Jani
>> - In comments, function names, use "sink" instead of "monitor",
>> so that the implementation could be close to the language of
>> HDMI spec.
>>
>> V4: Addressed review comment from Maarten
>> - scrambling -> hdmi_scrambling
>> high_tmds_clock_ratio -> hdmi_high_tmds_clock_ratio
>>
>> V5: Addressed review comments from Ville and Ander
>> - Do not modifiy the crtc_state after compute_config. Move all
>> scrambling and tmds_clock_ratio calcutations to compute_config.
>> - While setting scrambling for source/sink, do not check the
>> conditions again, just go by the crtc_state flags. This will
>> simplyfy the condition checks.
>>
>> V6: Addressed review comments from Ville
>> - Do not add IS_GLK check in disable/enable function, instead add it
>> in compute_config, while setting state flags.
>> - Remove unnecessary paranthesis.
>> - Simplyfy handle_sink_scrambling function as suggested.
>> - Add readout code for scrambling status in get_ddi_config and add a
>> check for the same in pipe_config_compare.
>>
>> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
>> ---
>> drivers/gpu/drm/i915/i915_reg.h | 7 ++++
>> drivers/gpu/drm/i915/intel_ddi.c | 33 ++++++++++++++++
>> drivers/gpu/drm/i915/intel_display.c | 5 +++
>> drivers/gpu/drm/i915/intel_drv.h | 14 +++++++
>> drivers/gpu/drm/i915/intel_hdmi.c | 74 ++++++++++++++++++++++++++++++++++++
>> 5 files changed, 133 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>> index 4906ce4d..f7891ac 100644
>> --- a/drivers/gpu/drm/i915/i915_reg.h
>> +++ b/drivers/gpu/drm/i915/i915_reg.h
>> @@ -7824,7 +7824,14 @@ enum {
>> #define TRANS_DDI_EDP_INPUT_B_ONOFF (5<<12)
>> #define TRANS_DDI_EDP_INPUT_C_ONOFF (6<<12)
>> #define TRANS_DDI_DP_VC_PAYLOAD_ALLOC (1<<8)
>> +#define TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE (1<<7)
>> +#define TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ (1<<6)
>> #define TRANS_DDI_BFI_ENABLE (1<<4)
>> +#define TRANS_DDI_HIGH_TMDS_CHAR_RATE (1<<4)
>> +#define TRANS_DDI_HDMI_SCRAMBLING (1<<0)
>> +#define TRANS_DDI_HDMI_SCRAMBLING_MASK (TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE \
>> + | TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ \
>> + | TRANS_DDI_HDMI_SCRAMBLING)
> Last line is misaligned.
Ok.
>>
>> /* DisplayPort Transport Control */
>> #define _DP_TP_CTL_A 0x64040
>> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
>> index a7c08d7..d0c6927 100644
>> --- a/drivers/gpu/drm/i915/intel_ddi.c
>> +++ b/drivers/gpu/drm/i915/intel_ddi.c
>> @@ -1311,6 +1311,11 @@ void intel_ddi_enable_transcoder_func(struct drm_crtc *crtc)
>> temp |= TRANS_DDI_MODE_SELECT_HDMI;
>> else
>> temp |= TRANS_DDI_MODE_SELECT_DVI;
>> +
>> + if (IS_GEMINILAKE(dev_priv))
>> + temp = intel_hdmi_handle_source_scrambling(
>> + intel_encoder,
>> + intel_crtc->config, temp);
> This whole hunk could just be:
>
> + if (config->hdmi_scrambling)
> + hdmi_config |= TRANS_DDI_HDMI_SCRAMBLING_MASK;
> +
> + if (config->hdmi_high_tmds_clock_ratio)
> + hdmi_config |= TRANS_DDI_HIGH_TMDS_CHAR_RATE;
>
> No need to check for GLK here, since the compute config code already did.
As I was emphasizing in the previous review comments, having two
separate functions, one to set source_scrambling and
other to set sink_scrambling makes it easy to follow up, due to design
symmetry, and in that case you need not to refer
to bspec to find out which all registers be dealing with scrambling ,
just check for scrambling control functions. So I was insisting
on keeping them.
But anyways, both you and Ville are insisting on keeping it inline, so
lets keep it that way.
>> } else if (type == INTEL_OUTPUT_ANALOG) {
>> temp |= TRANS_DDI_MODE_SELECT_FDI;
>> temp |= (intel_crtc->config->fdi_lanes - 1) << 1;
>> @@ -1885,6 +1890,21 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder,
>> struct intel_digital_port *intel_dig_port =
>> enc_to_dig_port(encoder);
>>
>> + if (IS_GEMINILAKE(dev_priv)) {
>> + struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
>> + /*
>> + * GLK sports a native HDMI 2.0 controller. If required
>> + * clock rate is > 340 Mhz && scrambling is supported
>> + * by sink, enable scrambling before enabling the
>> + * HDMI 2.0 port. The sink can choose to disable the
>> + * scrambling if it doesn't detect a scrambled within
>> + * 100 ms.
>> + */
>> + intel_hdmi_handle_sink_scrambling(intel_encoder,
>> + conn_state->connector,
>> + crtc->config, true);
> This function receives a pipe_config pointer as argument. Use that instead of
> crtc->config.
Ok.
>> + }
>> +
>> /* In HDMI/DVI mode, the port width, and swing/emphasis values
>> * are ignored so nothing special needs to be done besides
>> * enabling the port.
>> @@ -1917,6 +1937,14 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder,
>> if (old_crtc_state->has_audio)
>> intel_audio_codec_disable(intel_encoder);
>>
>> + if (type == INTEL_OUTPUT_HDMI) {
>> + struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
>> +
>> + intel_hdmi_handle_sink_scrambling(intel_encoder,
>> + old_conn_state->connector,
>> + intel_crtc->config, false);
>> + }
>> +
>> if (type == INTEL_OUTPUT_EDP) {
>> struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
>>
>> @@ -2044,6 +2072,11 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
>>
>> if (intel_hdmi->infoframe_enabled(&encoder->base, pipe_config))
>> pipe_config->has_infoframe = true;
>> +
>> + if (temp & TRANS_DDI_HDMI_SCRAMBLING_MASK)
>> + pipe_config->hdmi_scrambling = true;
>> + if (temp & TRANS_DDI_HIGH_TMDS_CHAR_RATE)
>> + pipe_config->hdmi_high_tmds_clock_ratio = true;
> Hmm, we might need a IS_GLK here, since these bits only exist in that platform.
> I believe they should read zero though, since they are listed are reserved.
> Dunno.
Hmm, I dont think there would be a way to set the reserved bits though,
so we can keep it. In this way the
only place we are checking and setting the platform is compute_config.
>> /* fall through */
>> case TRANS_DDI_MODE_SELECT_DVI:
>> pipe_config->lane_count = 4;
>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>> index 99e8d9c..c017ed3 100644
>> --- a/drivers/gpu/drm/i915/intel_display.c
>> +++ b/drivers/gpu/drm/i915/intel_display.c
>> @@ -11662,6 +11662,11 @@ static void __printf(3, 4)
>> if ((INTEL_GEN(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
>> IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
>> PIPE_CONF_CHECK_I(limited_color_range);
>> + if (IS_GEMINILAKE(dev_priv)) {
> No need to check for GLK here. The configuration should never be set for other
> platforms. If it is set, that's a bug and we want verify_crtc_state() to tells
> us about it.
Agree, will remove this.
>
>> + PIPE_CONF_CHECK_I(hdmi_scrambling);
>> + PIPE_CONF_CHECK_I(hdmi_high_tmds_clock_ratio);
>> + }
>> +
>> PIPE_CONF_CHECK_I(has_infoframe);
>>
>> PIPE_CONF_CHECK_I(has_audio);
>> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
>> index e6fbbee..baefbaa 100644
>> --- a/drivers/gpu/drm/i915/intel_drv.h
>> +++ b/drivers/gpu/drm/i915/intel_drv.h
>> @@ -695,6 +695,12 @@ struct intel_crtc_state {
>>
>> /* Gamma mode programmed on the pipe */
>> uint32_t gamma_mode;
>> +
>> + /* HDMI scrambling status (sink) */
>> + bool hdmi_scrambling;
>> +
>> + /* HDMI High TMDS char rate ratio (sink) */
>> + bool hdmi_high_tmds_clock_ratio;
>> };
>>
>> struct vlv_wm_state {
>> @@ -1626,6 +1632,14 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>> bool intel_hdmi_compute_config(struct intel_encoder *encoder,
>> struct intel_crtc_state *pipe_config,
>> struct drm_connector_state *conn_state);
>> +uint32_t
>> +intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
>> + struct intel_crtc_state *config,
>> + uint32_t hdmi_config);
>> +void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
>> + struct drm_connector *connector,
>> + struct intel_crtc_state *config,
>> + bool enable);
>> void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable);
>>
>>
>> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
>> index c2184f7..0a1ae03 100644
>> --- a/drivers/gpu/drm/i915/intel_hdmi.c
>> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
>> @@ -34,6 +34,7 @@
>> #include <drm/drm_atomic_helper.h>
>> #include <drm/drm_crtc.h>
>> #include <drm/drm_edid.h>
>> +#include <drm/drm_scdc_helper.h>
>> #include "intel_drv.h"
>> #include <drm/i915_drm.h>
>> #include <drm/intel_lpe_audio.h>
>> @@ -1316,6 +1317,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
>> struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
>> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>> struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
>> + struct drm_scdc *scdc = &conn_state->connector->display_info.hdmi.scdc;
>> int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
>> int clock_12bpc = clock_8bpc * 3 / 2;
>> int desired_bpp;
>> @@ -1385,6 +1387,16 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
>>
>> pipe_config->lane_count = 4;
>>
>> + if (scdc->scrambling.supported && IS_GEMINILAKE(dev_priv)) {
>> + if (scdc->scrambling.low_rates)
>> + pipe_config->hdmi_scrambling = true;
>> +
>> + if (pipe_config->port_clock > 340000) {
>> + pipe_config->hdmi_scrambling = true;
>> + pipe_config->hdmi_high_tmds_clock_ratio = true;
>> + }
>> + }
>> +
>> return true;
>> }
>>
>> @@ -1794,6 +1806,68 @@ static void intel_hdmi_destroy(struct drm_connector *connector)
>> intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
>> }
>>
>> +void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
>> + struct drm_connector *connector,
>> + struct intel_crtc_state *config,
>> + bool enable)
>> +{
>> + struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
>> + struct drm_i915_private *dev_priv = connector->dev->dev_private;
>> + struct drm_scrambling *scrambling =
>> + &connector->display_info.hdmi.scdc.scrambling;
>> + struct i2c_adapter *adptr = intel_gmbus_get_adapter(dev_priv,
>> + intel_hdmi->ddc_bus);
>> + bool ret;
>> +
>> + if (!scrambling->supported)
>> + return;
>> +
>> + DRM_DEBUG_KMS("Setting sink scrambling for enc:%s connector:%s\n",
>> + intel_encoder->base.name, connector->name);
>> +
>> + if (config->hdmi_high_tmds_clock_ratio) {
>> + /* Set TMDS bit clock ratio to 1/40 or 1/10 */
>> + ret = drm_scdc_set_high_tmds_clock_ratio(adptr, enable);
>> + if (!ret) {
>> + DRM_ERROR("Set TMDS ratio failed\n");
>> + return;
>> + }
>> + }
>> +
>> + if (config->hdmi_scrambling) {
>> + /* Enable/disable sink scrambling */
>> + ret = drm_scdc_set_scrambling(adptr, enable);
>> + if (!ret) {
>> + DRM_ERROR("Set sink scrambling failed\n");
>> + return;
>> + }
>> + }
>> +
>> + DRM_DEBUG_KMS("sink scrambling handled\n");
>> +}
>> +
>> +uint32_t
>> +intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
>> + struct intel_crtc_state *config, uint32_t hdmi_config)
>> +{
>> + struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
>> + struct drm_connector *connector = &intel_hdmi->attached_connector->base;
>> +
>> + DRM_DEBUG_KMS("Setting scrambling for enc:%s connector:%s\n",
>> + intel_encoder->base.name, connector->name);
> Instead of debugging here, print the hdmi scrambling values in
> intel_dump_pipe_config().
I am also interested in which encoder and connector are we setting the
values for, is it that bad :) ?
>
>> + hdmi_config &= ~(TRANS_DDI_HDMI_SCRAMBLING_MASK |
>> + TRANS_DDI_HIGH_TMDS_CHAR_RATE);
> This is unnecessary. The hunk below belongs in
> intel_ddi_enable_transcoder_func() and that function does not do read-modify-
> write. Any bit that is not explicitly set is zero. I think things are just
> simpler if this function doesn't exist.
Yeah, will do that.
> Ander
>
>> + if (config->hdmi_scrambling)
>> + hdmi_config |= TRANS_DDI_HDMI_SCRAMBLING_MASK;
>> +
>> + if (config->hdmi_high_tmds_clock_ratio)
>> + hdmi_config |= TRANS_DDI_HIGH_TMDS_CHAR_RATE;
>> +
>> + return hdmi_config;
>> +}
>> +
>> static u8 intel_hdmi_ddc_pin(struct drm_i915_private *dev_priv,
>> enum port port)
>> {
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^ permalink raw reply [flat|nested] 14+ messages in thread* Re: [Intel-gfx] [PATCH v6 5/6] drm/i915: enable scrambling
2017-03-03 12:03 ` Sharma, Shashank
@ 2017-03-03 13:01 ` Ander Conselvan De Oliveira
2017-03-03 16:03 ` Sharma, Shashank
0 siblings, 1 reply; 14+ messages in thread
From: Ander Conselvan De Oliveira @ 2017-03-03 13:01 UTC (permalink / raw)
To: Sharma, Shashank, dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, daniel.vetter, treding
On Fri, 2017-03-03 at 17:33 +0530, Sharma, Shashank wrote:
> Thanks for the review Ander. My comments inline.
>
> Shashank
>
> On 3/3/2017 3:22 PM, Ander Conselvan De Oliveira wrote:
> > On Fri, 2017-03-03 at 11:59 +0530, Shashank Sharma wrote:
> > > Geminilake platform sports a native HDMI 2.0 controller, and is
> > > capable of driving pixel-clocks upto 594Mhz. HDMI 2.0 spec
> > > mendates scrambling for these higher clocks, for reduced RF footprint.
> > >
> > > This patch checks if the monitor supports scrambling, and if required,
> > > enables it during the modeset.
> > >
> > > V2: Addressed review comments from Ville:
> > > - Do not track scrambling status in DRM layer, track somewhere in
> > > driver like in intel_crtc_state.
> > > - Don't talk to monitor at such a low layer, set monitor scrambling
> > > in intel_enable_ddi() before enabling the port.
> > >
> > > V3: Addressed review comments from Jani
> > > - In comments, function names, use "sink" instead of "monitor",
> > > so that the implementation could be close to the language of
> > > HDMI spec.
> > >
> > > V4: Addressed review comment from Maarten
> > > - scrambling -> hdmi_scrambling
> > > high_tmds_clock_ratio -> hdmi_high_tmds_clock_ratio
> > >
> > > V5: Addressed review comments from Ville and Ander
> > > - Do not modifiy the crtc_state after compute_config. Move all
> > > scrambling and tmds_clock_ratio calcutations to compute_config.
> > > - While setting scrambling for source/sink, do not check the
> > > conditions again, just go by the crtc_state flags. This will
> > > simplyfy the condition checks.
> > >
> > > V6: Addressed review comments from Ville
> > > - Do not add IS_GLK check in disable/enable function, instead add it
> > > in compute_config, while setting state flags.
> > > - Remove unnecessary paranthesis.
> > > - Simplyfy handle_sink_scrambling function as suggested.
> > > - Add readout code for scrambling status in get_ddi_config and add a
> > > check for the same in pipe_config_compare.
> > >
> > > Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
> > > ---
> > > drivers/gpu/drm/i915/i915_reg.h | 7 ++++
> > > drivers/gpu/drm/i915/intel_ddi.c | 33 ++++++++++++++++
> > > drivers/gpu/drm/i915/intel_display.c | 5 +++
> > > drivers/gpu/drm/i915/intel_drv.h | 14 +++++++
> > > drivers/gpu/drm/i915/intel_hdmi.c | 74 ++++++++++++++++++++++++++++++++++++
> > > 5 files changed, 133 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > > index 4906ce4d..f7891ac 100644
> > > --- a/drivers/gpu/drm/i915/i915_reg.h
> > > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > > @@ -7824,7 +7824,14 @@ enum {
> > > #define TRANS_DDI_EDP_INPUT_B_ONOFF (5<<12)
> > > #define TRANS_DDI_EDP_INPUT_C_ONOFF (6<<12)
> > > #define TRANS_DDI_DP_VC_PAYLOAD_ALLOC (1<<8)
> > > +#define TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE (1<<7)
> > > +#define TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ (1<<6)
> > > #define TRANS_DDI_BFI_ENABLE (1<<4)
> > > +#define TRANS_DDI_HIGH_TMDS_CHAR_RATE (1<<4)
> > > +#define TRANS_DDI_HDMI_SCRAMBLING (1<<0)
> > > +#define TRANS_DDI_HDMI_SCRAMBLING_MASK (TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE \
> > > + | TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ \
> > > + | TRANS_DDI_HDMI_SCRAMBLING)
> >
> > Last line is misaligned.
>
> Ok.
> > >
> > > /* DisplayPort Transport Control */
> > > #define _DP_TP_CTL_A 0x64040
> > > diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> > > index a7c08d7..d0c6927 100644
> > > --- a/drivers/gpu/drm/i915/intel_ddi.c
> > > +++ b/drivers/gpu/drm/i915/intel_ddi.c
> > > @@ -1311,6 +1311,11 @@ void intel_ddi_enable_transcoder_func(struct drm_crtc *crtc)
> > > temp |= TRANS_DDI_MODE_SELECT_HDMI;
> > > else
> > > temp |= TRANS_DDI_MODE_SELECT_DVI;
> > > +
> > > + if (IS_GEMINILAKE(dev_priv))
> > > + temp = intel_hdmi_handle_source_scrambling(
> > > + intel_encoder,
> > > + intel_crtc->config, temp);
> >
> > This whole hunk could just be:
> >
> > + if (config->hdmi_scrambling)
> > + hdmi_config |= TRANS_DDI_HDMI_SCRAMBLING_MASK;
> > +
> > + if (config->hdmi_high_tmds_clock_ratio)
> > + hdmi_config |= TRANS_DDI_HIGH_TMDS_CHAR_RATE;
> >
> > No need to check for GLK here, since the compute config code already did.
>
> As I was emphasizing in the previous review comments, having two
> separate functions, one to set source_scrambling and
> other to set sink_scrambling makes it easy to follow up, due to design
> symmetry, and in that case you need not to refer
> to bspec to find out which all registers be dealing with scrambling ,
> just check for scrambling control functions. So I was insisting
> on keeping them.
But that design creates an asymmetry when it comes to checking all bits that are
enabled in TRANS_DDI_FUNC_CTL() that involves function-hopping. Maybe it is just
a matter of different taste. But for the more practical problem of finding what
bits are involved in enabling scrambling, I think
git grep hdmi_scrambling
will do a good enough job.
>
> But anyways, both you and Ville are insisting on keeping it inline, so
> lets keep it that way.
> > > } else if (type == INTEL_OUTPUT_ANALOG) {
> > > temp |= TRANS_DDI_MODE_SELECT_FDI;
> > > temp |= (intel_crtc->config->fdi_lanes - 1) << 1;
> > > @@ -1885,6 +1890,21 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder,
> > > struct intel_digital_port *intel_dig_port =
> > > enc_to_dig_port(encoder);
> > >
> > > + if (IS_GEMINILAKE(dev_priv)) {
> > > + struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
> > > + /*
> > > + * GLK sports a native HDMI 2.0 controller. If required
> > > + * clock rate is > 340 Mhz && scrambling is supported
> > > + * by sink, enable scrambling before enabling the
> > > + * HDMI 2.0 port. The sink can choose to disable the
> > > + * scrambling if it doesn't detect a scrambled within
> > > + * 100 ms.
> > > + */
> > > + intel_hdmi_handle_sink_scrambling(intel_encoder,
> > > + conn_state->connector,
> > > + crtc->config, true);
> >
> > This function receives a pipe_config pointer as argument. Use that instead of
> > crtc->config.
>
> Ok.
> > > + }
> > > +
> > > /* In HDMI/DVI mode, the port width, and swing/emphasis values
> > > * are ignored so nothing special needs to be done besides
> > > * enabling the port.
> > > @@ -1917,6 +1937,14 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder,
> > > if (old_crtc_state->has_audio)
> > > intel_audio_codec_disable(intel_encoder);
> > >
> > > + if (type == INTEL_OUTPUT_HDMI) {
> > > + struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> > > +
> > > + intel_hdmi_handle_sink_scrambling(intel_encoder,
> > > + old_conn_state->connector,
> > > + intel_crtc->config, false);
> > > + }
> > > +
> > > if (type == INTEL_OUTPUT_EDP) {
> > > struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> > >
> > > @@ -2044,6 +2072,11 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
> > >
> > > if (intel_hdmi->infoframe_enabled(&encoder->base, pipe_config))
> > > pipe_config->has_infoframe = true;
> > > +
> > > + if (temp & TRANS_DDI_HDMI_SCRAMBLING_MASK)
I missed this the first time, but we say hdmi_scrambling is enabled if any of
those bits in the mask is set. Is that really what we want? Or should this check
specifically for the TRANS_DDI_HDMI_SCRAMBLING bit or all the bits set?
> > > + pipe_config->hdmi_scrambling = true;
> > > + if (temp & TRANS_DDI_HIGH_TMDS_CHAR_RATE)
> > > + pipe_config->hdmi_high_tmds_clock_ratio = true;
> >
> > Hmm, we might need a IS_GLK here, since these bits only exist in that platform.
> > I believe they should read zero though, since they are listed are reserved.
> > Dunno.
>
> Hmm, I dont think there would be a way to set the reserved bits though,
> so we can keep it. In this way the
> only place we are checking and setting the platform is compute_config.
Yeah, with the change to check the state for non-GLK too, we get a WARN if this
fails, so seems ok.
> > > /* fall through */
> > > case TRANS_DDI_MODE_SELECT_DVI:
> > > pipe_config->lane_count = 4;
> > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > > index 99e8d9c..c017ed3 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.c
> > > +++ b/drivers/gpu/drm/i915/intel_display.c
> > > @@ -11662,6 +11662,11 @@ static void __printf(3, 4)
> > > if ((INTEL_GEN(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
> > > IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> > > PIPE_CONF_CHECK_I(limited_color_range);
> > > + if (IS_GEMINILAKE(dev_priv)) {
> >
> > No need to check for GLK here. The configuration should never be set for other
> > platforms. If it is set, that's a bug and we want verify_crtc_state() to tells
> > us about it.
>
> Agree, will remove this.
> >
> > > + PIPE_CONF_CHECK_I(hdmi_scrambling);
> > > + PIPE_CONF_CHECK_I(hdmi_high_tmds_clock_ratio);
> > > + }
> > > +
> > > PIPE_CONF_CHECK_I(has_infoframe);
> > >
> > > PIPE_CONF_CHECK_I(has_audio);
> > > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > > index e6fbbee..baefbaa 100644
> > > --- a/drivers/gpu/drm/i915/intel_drv.h
> > > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > > @@ -695,6 +695,12 @@ struct intel_crtc_state {
> > >
> > > /* Gamma mode programmed on the pipe */
> > > uint32_t gamma_mode;
> > > +
> > > + /* HDMI scrambling status (sink) */
> > > + bool hdmi_scrambling;
> > > +
> > > + /* HDMI High TMDS char rate ratio (sink) */
> > > + bool hdmi_high_tmds_clock_ratio;
> > > };
> > >
> > > struct vlv_wm_state {
> > > @@ -1626,6 +1632,14 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
> > > bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> > > struct intel_crtc_state *pipe_config,
> > > struct drm_connector_state *conn_state);
> > > +uint32_t
> > > +intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
> > > + struct intel_crtc_state *config,
> > > + uint32_t hdmi_config);
> > > +void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
> > > + struct drm_connector *connector,
> > > + struct intel_crtc_state *config,
> > > + bool enable);
> > > void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable);
> > >
> > >
> > > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> > > index c2184f7..0a1ae03 100644
> > > --- a/drivers/gpu/drm/i915/intel_hdmi.c
> > > +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> > > @@ -34,6 +34,7 @@
> > > #include <drm/drm_atomic_helper.h>
> > > #include <drm/drm_crtc.h>
> > > #include <drm/drm_edid.h>
> > > +#include <drm/drm_scdc_helper.h>
> > > #include "intel_drv.h"
> > > #include <drm/i915_drm.h>
> > > #include <drm/intel_lpe_audio.h>
> > > @@ -1316,6 +1317,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> > > struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
> > > struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> > > struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> > > + struct drm_scdc *scdc = &conn_state->connector->display_info.hdmi.scdc;
> > > int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
> > > int clock_12bpc = clock_8bpc * 3 / 2;
> > > int desired_bpp;
> > > @@ -1385,6 +1387,16 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> > >
> > > pipe_config->lane_count = 4;
> > >
> > > + if (scdc->scrambling.supported && IS_GEMINILAKE(dev_priv)) {
> > > + if (scdc->scrambling.low_rates)
> > > + pipe_config->hdmi_scrambling = true;
> > > +
> > > + if (pipe_config->port_clock > 340000) {
> > > + pipe_config->hdmi_scrambling = true;
> > > + pipe_config->hdmi_high_tmds_clock_ratio = true;
> > > + }
> > > + }
> > > +
> > > return true;
> > > }
> > >
> > > @@ -1794,6 +1806,68 @@ static void intel_hdmi_destroy(struct drm_connector *connector)
> > > intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
> > > }
> > >
> > > +void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
> > > + struct drm_connector *connector,
> > > + struct intel_crtc_state *config,
> > > + bool enable)
> > > +{
> > > + struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
> > > + struct drm_i915_private *dev_priv = connector->dev->dev_private;
> > > + struct drm_scrambling *scrambling =
> > > + &connector->display_info.hdmi.scdc.scrambling;
> > > + struct i2c_adapter *adptr = intel_gmbus_get_adapter(dev_priv,
> > > + intel_hdmi->ddc_bus);
> > > + bool ret;
> > > +
> > > + if (!scrambling->supported)
> > > + return;
> > > +
> > > + DRM_DEBUG_KMS("Setting sink scrambling for enc:%s connector:%s\n",
> > > + intel_encoder->base.name, connector->name);
> > > +
> > > + if (config->hdmi_high_tmds_clock_ratio) {
> > > + /* Set TMDS bit clock ratio to 1/40 or 1/10 */
> > > + ret = drm_scdc_set_high_tmds_clock_ratio(adptr, enable);
> > > + if (!ret) {
> > > + DRM_ERROR("Set TMDS ratio failed\n");
> > > + return;
> > > + }
> > > + }
> > > +
> > > + if (config->hdmi_scrambling) {
> > > + /* Enable/disable sink scrambling */
> > > + ret = drm_scdc_set_scrambling(adptr, enable);
> > > + if (!ret) {
> > > + DRM_ERROR("Set sink scrambling failed\n");
> > > + return;
> > > + }
> > > + }
> > > +
> > > + DRM_DEBUG_KMS("sink scrambling handled\n");
> > > +}
> > > +
> > > +uint32_t
> > > +intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
> > > + struct intel_crtc_state *config, uint32_t hdmi_config)
> > > +{
> > > + struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
> > > + struct drm_connector *connector = &intel_hdmi->attached_connector->base;
> > > +
> > > + DRM_DEBUG_KMS("Setting scrambling for enc:%s connector:%s\n",
> > > + intel_encoder->base.name, connector->name);
> >
> > Instead of debugging here, print the hdmi scrambling values in
> > intel_dump_pipe_config().
>
> I am also interested in which encoder and connector are we setting the
> values for, is it that bad :) ?
The debug for the modeset should tell you that, but IMO it would be ok to leave
this extra debug message if the function would still exist.
Ander
> >
> > > + hdmi_config &= ~(TRANS_DDI_HDMI_SCRAMBLING_MASK |
> > > + TRANS_DDI_HIGH_TMDS_CHAR_RATE);
> >
> > This is unnecessary. The hunk below belongs in
> > intel_ddi_enable_transcoder_func() and that function does not do read-modify-
> > write. Any bit that is not explicitly set is zero. I think things are just
> > simpler if this function doesn't exist.
>
> Yeah, will do that.
> > Ander
> >
> > > + if (config->hdmi_scrambling)
> > > + hdmi_config |= TRANS_DDI_HDMI_SCRAMBLING_MASK;
> > > +
> > > + if (config->hdmi_high_tmds_clock_ratio)
> > > + hdmi_config |= TRANS_DDI_HIGH_TMDS_CHAR_RATE;
> > > +
> > > + return hdmi_config;
> > > +}
> > > +
> > > static u8 intel_hdmi_ddc_pin(struct drm_i915_private *dev_priv,
> > > enum port port)
> > > {
>
>
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^ permalink raw reply [flat|nested] 14+ messages in thread* Re: [PATCH v6 5/6] drm/i915: enable scrambling
2017-03-03 13:01 ` [Intel-gfx] " Ander Conselvan De Oliveira
@ 2017-03-03 16:03 ` Sharma, Shashank
0 siblings, 0 replies; 14+ messages in thread
From: Sharma, Shashank @ 2017-03-03 16:03 UTC (permalink / raw)
To: Ander Conselvan De Oliveira, dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, daniel.vetter, treding
Regards
Shashank
On 3/3/2017 6:31 PM, Ander Conselvan De Oliveira wrote:
> On Fri, 2017-03-03 at 17:33 +0530, Sharma, Shashank wrote:
>> Thanks for the review Ander. My comments inline.
>>
>> Shashank
>>
>> On 3/3/2017 3:22 PM, Ander Conselvan De Oliveira wrote:
>>> On Fri, 2017-03-03 at 11:59 +0530, Shashank Sharma wrote:
>>>> Geminilake platform sports a native HDMI 2.0 controller, and is
>>>> capable of driving pixel-clocks upto 594Mhz. HDMI 2.0 spec
>>>> mendates scrambling for these higher clocks, for reduced RF footprint.
>>>>
>>>> This patch checks if the monitor supports scrambling, and if required,
>>>> enables it during the modeset.
>>>>
>>>> V2: Addressed review comments from Ville:
>>>> - Do not track scrambling status in DRM layer, track somewhere in
>>>> driver like in intel_crtc_state.
>>>> - Don't talk to monitor at such a low layer, set monitor scrambling
>>>> in intel_enable_ddi() before enabling the port.
>>>>
>>>> V3: Addressed review comments from Jani
>>>> - In comments, function names, use "sink" instead of "monitor",
>>>> so that the implementation could be close to the language of
>>>> HDMI spec.
>>>>
>>>> V4: Addressed review comment from Maarten
>>>> - scrambling -> hdmi_scrambling
>>>> high_tmds_clock_ratio -> hdmi_high_tmds_clock_ratio
>>>>
>>>> V5: Addressed review comments from Ville and Ander
>>>> - Do not modifiy the crtc_state after compute_config. Move all
>>>> scrambling and tmds_clock_ratio calcutations to compute_config.
>>>> - While setting scrambling for source/sink, do not check the
>>>> conditions again, just go by the crtc_state flags. This will
>>>> simplyfy the condition checks.
>>>>
>>>> V6: Addressed review comments from Ville
>>>> - Do not add IS_GLK check in disable/enable function, instead add it
>>>> in compute_config, while setting state flags.
>>>> - Remove unnecessary paranthesis.
>>>> - Simplyfy handle_sink_scrambling function as suggested.
>>>> - Add readout code for scrambling status in get_ddi_config and add a
>>>> check for the same in pipe_config_compare.
>>>>
>>>> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
>>>> ---
>>>> drivers/gpu/drm/i915/i915_reg.h | 7 ++++
>>>> drivers/gpu/drm/i915/intel_ddi.c | 33 ++++++++++++++++
>>>> drivers/gpu/drm/i915/intel_display.c | 5 +++
>>>> drivers/gpu/drm/i915/intel_drv.h | 14 +++++++
>>>> drivers/gpu/drm/i915/intel_hdmi.c | 74 ++++++++++++++++++++++++++++++++++++
>>>> 5 files changed, 133 insertions(+)
>>>>
>>>> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>>>> index 4906ce4d..f7891ac 100644
>>>> --- a/drivers/gpu/drm/i915/i915_reg.h
>>>> +++ b/drivers/gpu/drm/i915/i915_reg.h
>>>> @@ -7824,7 +7824,14 @@ enum {
>>>> #define TRANS_DDI_EDP_INPUT_B_ONOFF (5<<12)
>>>> #define TRANS_DDI_EDP_INPUT_C_ONOFF (6<<12)
>>>> #define TRANS_DDI_DP_VC_PAYLOAD_ALLOC (1<<8)
>>>> +#define TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE (1<<7)
>>>> +#define TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ (1<<6)
>>>> #define TRANS_DDI_BFI_ENABLE (1<<4)
>>>> +#define TRANS_DDI_HIGH_TMDS_CHAR_RATE (1<<4)
>>>> +#define TRANS_DDI_HDMI_SCRAMBLING (1<<0)
>>>> +#define TRANS_DDI_HDMI_SCRAMBLING_MASK (TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE \
>>>> + | TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ \
>>>> + | TRANS_DDI_HDMI_SCRAMBLING)
>>> Last line is misaligned.
>> Ok.
>>>>
>>>> /* DisplayPort Transport Control */
>>>> #define _DP_TP_CTL_A 0x64040
>>>> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
>>>> index a7c08d7..d0c6927 100644
>>>> --- a/drivers/gpu/drm/i915/intel_ddi.c
>>>> +++ b/drivers/gpu/drm/i915/intel_ddi.c
>>>> @@ -1311,6 +1311,11 @@ void intel_ddi_enable_transcoder_func(struct drm_crtc *crtc)
>>>> temp |= TRANS_DDI_MODE_SELECT_HDMI;
>>>> else
>>>> temp |= TRANS_DDI_MODE_SELECT_DVI;
>>>> +
>>>> + if (IS_GEMINILAKE(dev_priv))
>>>> + temp = intel_hdmi_handle_source_scrambling(
>>>> + intel_encoder,
>>>> + intel_crtc->config, temp);
>>> This whole hunk could just be:
>>>
>>> + if (config->hdmi_scrambling)
>>> + hdmi_config |= TRANS_DDI_HDMI_SCRAMBLING_MASK;
>>> +
>>> + if (config->hdmi_high_tmds_clock_ratio)
>>> + hdmi_config |= TRANS_DDI_HIGH_TMDS_CHAR_RATE;
>>>
>>> No need to check for GLK here, since the compute config code already did.
>> As I was emphasizing in the previous review comments, having two
>> separate functions, one to set source_scrambling and
>> other to set sink_scrambling makes it easy to follow up, due to design
>> symmetry, and in that case you need not to refer
>> to bspec to find out which all registers be dealing with scrambling ,
>> just check for scrambling control functions. So I was insisting
>> on keeping them.
> But that design creates an asymmetry when it comes to checking all bits that are
> enabled in TRANS_DDI_FUNC_CTL() that involves function-hopping. Maybe it is just
> a matter of different taste. But for the more practical problem of finding what
> bits are involved in enabling scrambling, I think
>
> git grep hdmi_scrambling
>
> will do a good enough job.
Will do this.
>> But anyways, both you and Ville are insisting on keeping it inline, so
>> lets keep it that way.
>>>> } else if (type == INTEL_OUTPUT_ANALOG) {
>>>> temp |= TRANS_DDI_MODE_SELECT_FDI;
>>>> temp |= (intel_crtc->config->fdi_lanes - 1) << 1;
>>>> @@ -1885,6 +1890,21 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder,
>>>> struct intel_digital_port *intel_dig_port =
>>>> enc_to_dig_port(encoder);
>>>>
>>>> + if (IS_GEMINILAKE(dev_priv)) {
>>>> + struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
>>>> + /*
>>>> + * GLK sports a native HDMI 2.0 controller. If required
>>>> + * clock rate is > 340 Mhz && scrambling is supported
>>>> + * by sink, enable scrambling before enabling the
>>>> + * HDMI 2.0 port. The sink can choose to disable the
>>>> + * scrambling if it doesn't detect a scrambled within
>>>> + * 100 ms.
>>>> + */
>>>> + intel_hdmi_handle_sink_scrambling(intel_encoder,
>>>> + conn_state->connector,
>>>> + crtc->config, true);
>>> This function receives a pipe_config pointer as argument. Use that instead of
>>> crtc->config.
>> Ok.
>>>> + }
>>>> +
>>>> /* In HDMI/DVI mode, the port width, and swing/emphasis values
>>>> * are ignored so nothing special needs to be done besides
>>>> * enabling the port.
>>>> @@ -1917,6 +1937,14 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder,
>>>> if (old_crtc_state->has_audio)
>>>> intel_audio_codec_disable(intel_encoder);
>>>>
>>>> + if (type == INTEL_OUTPUT_HDMI) {
>>>> + struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
>>>> +
>>>> + intel_hdmi_handle_sink_scrambling(intel_encoder,
>>>> + old_conn_state->connector,
>>>> + intel_crtc->config, false);
>>>> + }
>>>> +
>>>> if (type == INTEL_OUTPUT_EDP) {
>>>> struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
>>>>
>>>> @@ -2044,6 +2072,11 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
>>>>
>>>> if (intel_hdmi->infoframe_enabled(&encoder->base, pipe_config))
>>>> pipe_config->has_infoframe = true;
>>>> +
>>>> + if (temp & TRANS_DDI_HDMI_SCRAMBLING_MASK)
> I missed this the first time, but we say hdmi_scrambling is enabled if any of
> those bits in the mask is set. Is that really what we want? Or should this check
> specifically for the TRANS_DDI_HDMI_SCRAMBLING bit or all the bits set?
Initially I thought of any of those bits in the mask, but now I am
thinking we are always setting all of those bits
togother, and as per the bspec, all of it is required, so I will add it
like this:
(temp & TRANS_DDI_HDMI_SCRAMBLING_MASK == TRANS_DDI_HDMI_SCRAMBLING_MASK)
Shashank
>>>> + pipe_config->hdmi_scrambling = true;
>>>> + if (temp & TRANS_DDI_HIGH_TMDS_CHAR_RATE)
>>>> + pipe_config->hdmi_high_tmds_clock_ratio = true;
>>> Hmm, we might need a IS_GLK here, since these bits only exist in that platform.
>>> I believe they should read zero though, since they are listed are reserved.
>>> Dunno.
>> Hmm, I dont think there would be a way to set the reserved bits though,
>> so we can keep it. In this way the
>> only place we are checking and setting the platform is compute_config.
> Yeah, with the change to check the state for non-GLK too, we get a WARN if this
> fails, so seems ok.
>
>>>> /* fall through */
>>>> case TRANS_DDI_MODE_SELECT_DVI:
>>>> pipe_config->lane_count = 4;
>>>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>>>> index 99e8d9c..c017ed3 100644
>>>> --- a/drivers/gpu/drm/i915/intel_display.c
>>>> +++ b/drivers/gpu/drm/i915/intel_display.c
>>>> @@ -11662,6 +11662,11 @@ static void __printf(3, 4)
>>>> if ((INTEL_GEN(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
>>>> IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
>>>> PIPE_CONF_CHECK_I(limited_color_range);
>>>> + if (IS_GEMINILAKE(dev_priv)) {
>>> No need to check for GLK here. The configuration should never be set for other
>>> platforms. If it is set, that's a bug and we want verify_crtc_state() to tells
>>> us about it.
>> Agree, will remove this.
>>>> + PIPE_CONF_CHECK_I(hdmi_scrambling);
>>>> + PIPE_CONF_CHECK_I(hdmi_high_tmds_clock_ratio);
>>>> + }
>>>> +
>>>> PIPE_CONF_CHECK_I(has_infoframe);
>>>>
>>>> PIPE_CONF_CHECK_I(has_audio);
>>>> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
>>>> index e6fbbee..baefbaa 100644
>>>> --- a/drivers/gpu/drm/i915/intel_drv.h
>>>> +++ b/drivers/gpu/drm/i915/intel_drv.h
>>>> @@ -695,6 +695,12 @@ struct intel_crtc_state {
>>>>
>>>> /* Gamma mode programmed on the pipe */
>>>> uint32_t gamma_mode;
>>>> +
>>>> + /* HDMI scrambling status (sink) */
>>>> + bool hdmi_scrambling;
>>>> +
>>>> + /* HDMI High TMDS char rate ratio (sink) */
>>>> + bool hdmi_high_tmds_clock_ratio;
>>>> };
>>>>
>>>> struct vlv_wm_state {
>>>> @@ -1626,6 +1632,14 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>>>> bool intel_hdmi_compute_config(struct intel_encoder *encoder,
>>>> struct intel_crtc_state *pipe_config,
>>>> struct drm_connector_state *conn_state);
>>>> +uint32_t
>>>> +intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
>>>> + struct intel_crtc_state *config,
>>>> + uint32_t hdmi_config);
>>>> +void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
>>>> + struct drm_connector *connector,
>>>> + struct intel_crtc_state *config,
>>>> + bool enable);
>>>> void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable);
>>>>
>>>>
>>>> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
>>>> index c2184f7..0a1ae03 100644
>>>> --- a/drivers/gpu/drm/i915/intel_hdmi.c
>>>> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
>>>> @@ -34,6 +34,7 @@
>>>> #include <drm/drm_atomic_helper.h>
>>>> #include <drm/drm_crtc.h>
>>>> #include <drm/drm_edid.h>
>>>> +#include <drm/drm_scdc_helper.h>
>>>> #include "intel_drv.h"
>>>> #include <drm/i915_drm.h>
>>>> #include <drm/intel_lpe_audio.h>
>>>> @@ -1316,6 +1317,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
>>>> struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
>>>> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>>>> struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
>>>> + struct drm_scdc *scdc = &conn_state->connector->display_info.hdmi.scdc;
>>>> int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
>>>> int clock_12bpc = clock_8bpc * 3 / 2;
>>>> int desired_bpp;
>>>> @@ -1385,6 +1387,16 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
>>>>
>>>> pipe_config->lane_count = 4;
>>>>
>>>> + if (scdc->scrambling.supported && IS_GEMINILAKE(dev_priv)) {
>>>> + if (scdc->scrambling.low_rates)
>>>> + pipe_config->hdmi_scrambling = true;
>>>> +
>>>> + if (pipe_config->port_clock > 340000) {
>>>> + pipe_config->hdmi_scrambling = true;
>>>> + pipe_config->hdmi_high_tmds_clock_ratio = true;
>>>> + }
>>>> + }
>>>> +
>>>> return true;
>>>> }
>>>>
>>>> @@ -1794,6 +1806,68 @@ static void intel_hdmi_destroy(struct drm_connector *connector)
>>>> intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
>>>> }
>>>>
>>>> +void intel_hdmi_handle_sink_scrambling(struct intel_encoder *intel_encoder,
>>>> + struct drm_connector *connector,
>>>> + struct intel_crtc_state *config,
>>>> + bool enable)
>>>> +{
>>>> + struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
>>>> + struct drm_i915_private *dev_priv = connector->dev->dev_private;
>>>> + struct drm_scrambling *scrambling =
>>>> + &connector->display_info.hdmi.scdc.scrambling;
>>>> + struct i2c_adapter *adptr = intel_gmbus_get_adapter(dev_priv,
>>>> + intel_hdmi->ddc_bus);
>>>> + bool ret;
>>>> +
>>>> + if (!scrambling->supported)
>>>> + return;
>>>> +
>>>> + DRM_DEBUG_KMS("Setting sink scrambling for enc:%s connector:%s\n",
>>>> + intel_encoder->base.name, connector->name);
>>>> +
>>>> + if (config->hdmi_high_tmds_clock_ratio) {
>>>> + /* Set TMDS bit clock ratio to 1/40 or 1/10 */
>>>> + ret = drm_scdc_set_high_tmds_clock_ratio(adptr, enable);
>>>> + if (!ret) {
>>>> + DRM_ERROR("Set TMDS ratio failed\n");
>>>> + return;
>>>> + }
>>>> + }
>>>> +
>>>> + if (config->hdmi_scrambling) {
>>>> + /* Enable/disable sink scrambling */
>>>> + ret = drm_scdc_set_scrambling(adptr, enable);
>>>> + if (!ret) {
>>>> + DRM_ERROR("Set sink scrambling failed\n");
>>>> + return;
>>>> + }
>>>> + }
>>>> +
>>>> + DRM_DEBUG_KMS("sink scrambling handled\n");
>>>> +}
>>>> +
>>>> +uint32_t
>>>> +intel_hdmi_handle_source_scrambling(struct intel_encoder *intel_encoder,
>>>> + struct intel_crtc_state *config, uint32_t hdmi_config)
>>>> +{
>>>> + struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&intel_encoder->base);
>>>> + struct drm_connector *connector = &intel_hdmi->attached_connector->base;
>>>> +
>>>> + DRM_DEBUG_KMS("Setting scrambling for enc:%s connector:%s\n",
>>>> + intel_encoder->base.name, connector->name);
>>> Instead of debugging here, print the hdmi scrambling values in
>>> intel_dump_pipe_config().
>> I am also interested in which encoder and connector are we setting the
>> values for, is it that bad :) ?
> The debug for the modeset should tell you that, but IMO it would be ok to leave
> this extra debug message if the function would still exist.
>
> Ander
>
>>>> + hdmi_config &= ~(TRANS_DDI_HDMI_SCRAMBLING_MASK |
>>>> + TRANS_DDI_HIGH_TMDS_CHAR_RATE);
>>> This is unnecessary. The hunk below belongs in
>>> intel_ddi_enable_transcoder_func() and that function does not do read-modify-
>>> write. Any bit that is not explicitly set is zero. I think things are just
>>> simpler if this function doesn't exist.
>> Yeah, will do that.
>>> Ander
>>>
>>>> + if (config->hdmi_scrambling)
>>>> + hdmi_config |= TRANS_DDI_HDMI_SCRAMBLING_MASK;
>>>> +
>>>> + if (config->hdmi_high_tmds_clock_ratio)
>>>> + hdmi_config |= TRANS_DDI_HIGH_TMDS_CHAR_RATE;
>>>> +
>>>> + return hdmi_config;
>>>> +}
>>>> +
>>>> static u8 intel_hdmi_ddc_pin(struct drm_i915_private *dev_priv,
>>>> enum port port)
>>>> {
>>
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^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH v6 6/6] drm/i915: allow HDMI 2.0 clock rates
2017-03-03 6:29 [PATCH v6 0/6] HDMI 2.0: Scrambling in DRM layer Shashank Sharma
` (4 preceding siblings ...)
2017-03-03 6:29 ` [PATCH v6 5/6] drm/i915: enable scrambling Shashank Sharma
@ 2017-03-03 6:29 ` Shashank Sharma
2017-03-03 6:47 ` ✓ Fi.CI.BAT: success for HDMI 2.0: Scrambling in DRM layer (rev6) Patchwork
6 siblings, 0 replies; 14+ messages in thread
From: Shashank Sharma @ 2017-03-03 6:29 UTC (permalink / raw)
To: dri-devel, intel-gfx, ville.syrjala
Cc: jose.abreu, ander.conselvan.de.oliveira, daniel.vetter, treding
Geminilake has a native HDMI 2.0 controller, which is capable of
driving clocks upto 594Mhz. This patch updates the max tmds clock
limit for the same.
V2: rebase
V3: rebase
V4: added r-b from Ander
V5: rebase
V6: rebase
Cc: Ander Conselvan De Oliveira <ander.conselvan.de.oliveira@intel.com>
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Ander Conselvan De Oliveira <ander.conselvan.de.oliveira@intel.com>
---
drivers/gpu/drm/i915/intel_hdmi.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 0a1ae03..be25aac 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1209,6 +1209,8 @@ static int intel_hdmi_source_max_tmds_clock(struct drm_i915_private *dev_priv)
{
if (IS_G4X(dev_priv))
return 165000;
+ else if (IS_GEMINILAKE(dev_priv))
+ return 594000;
else if (IS_HASWELL(dev_priv) || INTEL_INFO(dev_priv)->gen >= 8)
return 300000;
else
--
1.9.1
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^ permalink raw reply related [flat|nested] 14+ messages in thread* ✓ Fi.CI.BAT: success for HDMI 2.0: Scrambling in DRM layer (rev6)
2017-03-03 6:29 [PATCH v6 0/6] HDMI 2.0: Scrambling in DRM layer Shashank Sharma
` (5 preceding siblings ...)
2017-03-03 6:29 ` [PATCH v6 6/6] drm/i915: allow HDMI 2.0 clock rates Shashank Sharma
@ 2017-03-03 6:47 ` Patchwork
6 siblings, 0 replies; 14+ messages in thread
From: Patchwork @ 2017-03-03 6:47 UTC (permalink / raw)
To: Shashank Sharma; +Cc: intel-gfx
== Series Details ==
Series: HDMI 2.0: Scrambling in DRM layer (rev6)
URL : https://patchwork.freedesktop.org/series/19161/
State : success
== Summary ==
Series 19161v6 HDMI 2.0: Scrambling in DRM layer
https://patchwork.freedesktop.org/api/1.0/series/19161/revisions/6/mbox/
Test drv_module_reload:
Subgroup basic-reload:
dmesg-warn -> PASS (fi-ilk-650)
fi-bdw-5557u total:278 pass:267 dwarn:0 dfail:0 fail:0 skip:11
fi-bxt-j4205 total:278 pass:259 dwarn:0 dfail:0 fail:0 skip:19
fi-bxt-t5700 total:278 pass:258 dwarn:0 dfail:0 fail:0 skip:20
fi-byt-j1900 total:278 pass:251 dwarn:0 dfail:0 fail:0 skip:27
fi-byt-n2820 total:278 pass:247 dwarn:0 dfail:0 fail:0 skip:31
fi-hsw-4770 total:278 pass:262 dwarn:0 dfail:0 fail:0 skip:16
fi-hsw-4770r total:278 pass:262 dwarn:0 dfail:0 fail:0 skip:16
fi-ilk-650 total:278 pass:228 dwarn:0 dfail:0 fail:0 skip:50
fi-ivb-3520m total:278 pass:260 dwarn:0 dfail:0 fail:0 skip:18
fi-ivb-3770 total:278 pass:260 dwarn:0 dfail:0 fail:0 skip:18
fi-kbl-7500u total:278 pass:259 dwarn:1 dfail:0 fail:0 skip:18
fi-skl-6260u total:278 pass:268 dwarn:0 dfail:0 fail:0 skip:10
fi-skl-6700hq total:278 pass:261 dwarn:0 dfail:0 fail:0 skip:17
fi-skl-6700k total:278 pass:256 dwarn:4 dfail:0 fail:0 skip:18
fi-skl-6770hq total:278 pass:268 dwarn:0 dfail:0 fail:0 skip:10
fi-snb-2520m total:278 pass:250 dwarn:0 dfail:0 fail:0 skip:28
fi-snb-2600 total:278 pass:248 dwarn:0 dfail:0 fail:1 skip:29
7f38bb9ea553c613223b705326c1b8d1a8fc4a90 drm-tip: 2017y-03m-02d-22h-35m-41s UTC integration manifest
3621c19 drm/i915: allow HDMI 2.0 clock rates
df73883 drm/i915: enable scrambling
86f1e39 drm/edid: detect SCDC support in HF-VSDB
ed4f7e3 drm/edid: detect SCDC support in HF-VSDB
6e9ab7c drm/edid: check for HF-VSDB block
8666fe4 drm: Add SCDC helpers
== Logs ==
For more details see: https://intel-gfx-ci.01.org/CI/Patchwork_4048/
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^ permalink raw reply [flat|nested] 14+ messages in thread