[PATCH v2 5/5] drm/bridge: add preliminary driver for cadence dpi/dp bridge

Damian Kos
2018-07-24T11:13:36Z

This patch finally adds the preliminary driver for Cadence MHDP DPI/DP bridge.

Changes made in the low level driver:
- functions for writing register and register bits are now public
- added functions for reading registers and link training
adjustment

Signed-off-by: Damian Kos <dkos@cadence.com>
---
drivers/gpu/drm/bridge/Makefile | 2 +-
drivers/gpu/drm/bridge/cdns-mhdp-common.c | 110 +-
drivers/gpu/drm/bridge/cdns-mhdp-common.h | 11 +
drivers/gpu/drm/bridge/cdns-mhdp.c | 1233 +++++++++++++++++++++
4 files changed, 1353 insertions(+), 3 deletions(-)
create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp.c

diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index c9b35f736a00..5e2a84734c7a 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o
obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
-obj-$(CONFIG_DRM_CDNS_MHDP) += cdns-mhdp-common.o
+obj-$(CONFIG_DRM_CDNS_MHDP) += cdns-mhdp.o cdns-mhdp-common.o
obj-$(CONFIG_DRM_DUMB_VGA_DAC) += dumb-vga-dac.o
obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o
obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
diff --git a/drivers/gpu/drm/bridge/cdns-mhdp-common.c b/drivers/gpu/drm/bridge/cdns-mhdp-common.c
index 813319481220..5c426b04cf65 100644
--- a/drivers/gpu/drm/bridge/cdns-mhdp-common.c
+++ b/drivers/gpu/drm/bridge/cdns-mhdp-common.c
@@ -191,7 +191,55 @@ static int cdns_mhdp_mailbox_send(struct cdns_mhdp_device *mhdp, u8 module_id,
return 0;
}

-static int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val)
+int cdns_mhdp_reg_read(struct cdns_mhdp_device *mhdp, u32 addr, u32 *value)
+{
+ u8 msg[4], resp[8];
+ int ret;
+
+ if (addr == 0) {
+ ret = -EINVAL;
+ goto err_reg_read;
+ }
+
+ msg[0] = (u8)(addr >> 24);
+ msg[1] = (u8)(addr >> 16);
+ msg[2] = (u8)(addr >> 8);
+ msg[3] = (u8)addr;
+
+ ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_GENERAL,
+ GENERAL_REGISTER_READ,
+ sizeof(msg), msg);
+ if (ret)
+ goto err_reg_read;
+
+ ret = cdns_mhdp_mailbox_validate_receive(mhdp, MB_MODULE_ID_GENERAL,
+ GENERAL_REGISTER_READ,
+ sizeof(resp));
+ if (ret)
+ goto err_reg_read;
+
+ ret = cdns_mhdp_mailbox_read_receive(mhdp, resp, sizeof(resp));
+ if (ret)
+ goto err_reg_read;
+
+ /* Returned address value should be the same as requested */
+ if (memcmp(msg, resp, sizeof(msg))) {
+ ret = -EINVAL;
+ goto err_reg_read;
+ }
+
+ *value = (resp[4] << 24) | (resp[5] << 16) | (resp[6] << 8) | resp[7];
+
+err_reg_read:
+ if (ret) {
+ DRM_DEV_ERROR(mhdp->dev, "Failed to read register.\n");
+ *value = 0;
+ }
+
+ return ret;
+}
+
+int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val)
{
u8 msg[6];

@@ -205,7 +253,7 @@ static int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val)
DPTX_WRITE_REGISTER, sizeof(msg), msg);
}

-static int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr,
+int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr,
u8 start_bit, u8 bits_no, u32 val)
{
u8 field[8];
@@ -979,3 +1027,61 @@ int cdns_mhdp_audio_config(struct cdns_mhdp_device *mhdp,
DRM_DEV_ERROR(mhdp->dev, "audio config failed: %d\n", ret);
return ret;
}
+
+int cdns_mhdp_adjust_lt(struct cdns_mhdp_device *mhdp,
+ u8 nlanes, u16 udelay, u8 *lanes_data, u8 *dpcd)
+{
+ u8 payload[7];
+ u8 hdr[5]; /* For DPCD read response header */
+ u32 addr;
+ u8 const nregs = 6; /* Registers 0x202-0x207 */
+ int ret;
+
+ if (nlanes != 4 && nlanes != 2 && nlanes != 1) {
+ DRM_DEV_ERROR(mhdp->dev, "invalid number of lanes: %d\n",
+ nlanes);
+ ret = -EINVAL;
+ goto err_adjust_lt;
+ }
+
+ payload[0] = nlanes;
+ payload[1] = (u8)(udelay >> 8);
+ payload[2] = (u8)udelay;
+
+ payload[3] = lanes_data[0];
+ if (nlanes > 1)
+ payload[4] = lanes_data[1];
+ if (nlanes > 2) {
+ payload[5] = lanes_data[2];
+ payload[6] = lanes_data[3];
+ }
+
+ ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
+ DPTX_ADJUST_LT,
+ sizeof(payload), payload);
+ if (ret)
+ goto err_adjust_lt;
+
+ /* Yes, read the DPCD read command response */
+ ret = cdns_mhdp_mailbox_validate_receive(mhdp, MB_MODULE_ID_DP_TX,
+ DPTX_READ_DPCD,
+ sizeof(hdr) + nregs);
+ if (ret)
+ goto err_adjust_lt;
+
+ ret = cdns_mhdp_mailbox_read_receive(mhdp, hdr, sizeof(hdr));
+ if (ret)
+ goto err_adjust_lt;
+
+ addr = (hdr[2] << 24) | (hdr[3] << 8) | hdr[4];
+ if (addr != DP_LANE0_1_STATUS)
+ goto err_adjust_lt;
+
+ ret = cdns_mhdp_mailbox_read_receive(mhdp, dpcd, nregs);
+
+err_adjust_lt:
+ if (ret)
+ DRM_DEV_ERROR(mhdp->dev, "Failed to adjust Link Training.\n");
+
+ return ret;
+}
diff --git a/drivers/gpu/drm/bridge/cdns-mhdp-common.h b/drivers/gpu/drm/bridge/cdns-mhdp-common.h
index b0101f10594a..bdebe9e0a640 100644
--- a/drivers/gpu/drm/bridge/cdns-mhdp-common.h
+++ b/drivers/gpu/drm/bridge/cdns-mhdp-common.h
@@ -330,6 +330,7 @@
#define GENERAL_TEST_ECHO 0x02
#define GENERAL_BUS_SETTINGS 0x03
#define GENERAL_TEST_ACCESS 0x04
+#define GENERAL_REGISTER_READ 0x07

#define DPTX_SET_POWER_MNG 0x00
#define DPTX_SET_HOST_CAPABILITIES 0x01
@@ -349,6 +350,7 @@
#define DPTX_SET_LINK_BREAK_POINT 0x0f
#define DPTX_FORCE_LANES 0x10
#define DPTX_HPD_STATE 0x11
+#define DPTX_ADJUST_LT 0x12

#define FW_STANDBY 0
#define FW_ACTIVE 1
@@ -554,4 +556,13 @@ int cdns_mhdp_audio_stop(struct cdns_mhdp_device *mhdp,
int cdns_mhdp_audio_mute(struct cdns_mhdp_device *mhdp, bool enable);
int cdns_mhdp_audio_config(struct cdns_mhdp_device *mhdp,
struct audio_info *audio);
+int cdns_mhdp_register_read(struct cdns_mhdp_device *mhdp, u32 addr,
+ u32 *value);
+int cdns_mhdp_reg_read(struct cdns_mhdp_device *mhdp, u32 addr, u32 *value);
+int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val);
+int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr,
+ u8 start_bit, u8 bits_no, u32 val);
+int cdns_mhdp_adjust_lt(struct cdns_mhdp_device *mhdp, u8 nlanes,
+ u16 udelay, u8 *lanes_data,
+ u8 *dpcd);
#endif /* CDNS_MHDP_COMMON_H_ */
diff --git a/drivers/gpu/drm/bridge/cdns-mhdp.c b/drivers/gpu/drm/bridge/cdns-mhdp.c
new file mode 100644
index 000000000000..e31a1a11c96f
--- /dev/null
+++ b/drivers/gpu/drm/bridge/cdns-mhdp.c
@@ -0,0 +1,1233 @@
+// SPDX-License-Identifier: GPL v2
+/*
+ * Cadence MHDP DP bridge driver.
+ *
+ * Copyright: 2018 Cadence Design Systems, Inc.
+ *
+ * Author: Quentin Schulz <quentin.schulz@free-electrons.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/firmware.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_modeset_helper_vtables.h>
+
+#include "cdns-mhdp-common.h"
+
+#define DEBUG_MSG
+
+#define IRAM_FW_NAME "cadence_mhdp_iram_fw.bin"
+#define DRAM_FW_NAME "cadence_mhdp_dram_fw.bin"
+
+#define CDNS_APB_CFG 0x00000
+#define CDNS_APB_CTRL (CDNS_APB_CFG + 0x00)
+#define CDNS_MAILBOX_FULL (CDNS_APB_CFG + 0x08)
+#define CDNS_MAILBOX_EMPTY (CDNS_APB_CFG + 0x0c)
+#define CDNS_MAILBOX_TX_DATA (CDNS_APB_CFG + 0x10)
+#define CDNS_MAILBOX_RX_DATA (CDNS_APB_CFG + 0x14)
+#define CDNS_KEEP_ALIVE (CDNS_APB_CFG + 0x18)
+#define CDNS_KEEP_ALIVE_MASK GENMASK(7, 0)
+
+#define CDNS_SW_CLK_L (CDNS_APB_CFG + 0x3c)
+#define CDNS_SW_CLK_H (CDNS_APB_CFG + 0x40)
+#define CDNS_SW_EVENT0 (CDNS_APB_CFG + 0x44)
+#define CDNS_DPTX_HPD BIT(0)
+
+#define CDNS_SW_EVENT1 (CDNS_APB_CFG + 0x48)
+#define CDNS_SW_EVENT2 (CDNS_APB_CFG + 0x4c)
+#define CDNS_SW_EVENT3 (CDNS_APB_CFG + 0x50)
+
+#define CDNS_SOURCE_VIDEO_INTERFACE 0x00b00
+#define CDNS_BND_HSYNC2VSYNC (CDNS_SOURCE_VIDEO_INTERFACE + \
+ 0x00)
+#define CDNS_IP_DTCT_WIN GENMASK(11, 0)
+#define CDNS_IP_DET_INTERLACE_FORMAT BIT(12)
+#define CDNS_IP_BYPASS_V_INTERFACE BIT(13)
+
+#define CDNS_HSYNC2VSYNC_POL_CTRL (CDNS_SOURCE_VIDEO_INTERFACE + \
+ 0x10)
+#define CDNS_H2V_HSYNC_POL_ACTIVE_LOW BIT(1)
+#define CDNS_H2V_VSYNC_POL_ACTIVE_LOW BIT(2)
+
+#define CDNS_DPTX_PHY_CONFIG 0x02000
+#define CDNS_PHY_TRAINING_EN BIT(0)
+#define CDNS_PHY_TRAINING_TYPE(x) (((x) & GENMASK(3, 0)) << 1)
+#define CDNS_PHY_SCRAMBLER_BYPASS BIT(5)
+#define CDNS_PHY_ENCODER_BYPASS BIT(6)
+#define CDNS_PHY_SKEW_BYPASS BIT(7)
+#define CDNS_PHY_TRAINING_AUTO BIT(8)
+#define CDNS_PHY_LANE0_SKEW(x) (((x) & GENMASK(2, 0)) << 9)
+#define CDNS_PHY_LANE1_SKEW(x) (((x) & GENMASK(2, 0)) << 12)
+#define CDNS_PHY_LANE2_SKEW(x) (((x) & GENMASK(2, 0)) << 15)
+#define CDNS_PHY_LANE3_SKEW(x) (((x) & GENMASK(2, 0)) << 18)
+#define CDNS_PHY_COMMON_CONFIG (CDNS_PHY_LANE1_SKEW(1) | \
+ CDNS_PHY_LANE2_SKEW(2) | \
+ CDNS_PHY_LANE3_SKEW(3))
+#define CDNS_PHY_10BIT_EN BIT(21)
+
+#define CDNS_DPTX_FRAMER 0x02200
+#define CDNS_DP_FRAMER_GLOBAL_CONFIG (CDNS_DPTX_FRAMER + 0x00)
+#define CDNS_DP_NUM_LANES(x) (x - 1)
+#define CDNS_DP_FRAMER_EN BIT(3)
+#define CDNS_DP_RATE_GOVERNOR_EN BIT(4)
+#define CDNS_DP_NO_VIDEO_MODE BIT(5)
+#define CDNS_DP_DISABLE_PHY_RST BIT(6)
+#define CDNS_DP_WR_FAILING_EDGE_VSYNC BIT(7)
+
+#define CDNS_DP_SW_RESET (CDNS_DPTX_FRAMER + 0x04)
+#define CDNS_DP_FRAMER_TU (CDNS_DPTX_FRAMER + 0x08)
+#define CDNS_DP_FRAMER_TU_SIZE(x) (((x) & GENMASK(6, 0)) << 8)
+#define CDNS_DP_FRAMER_TU_VS(x) ((x) & GENMASK(5, 0))
+#define CDNS_DP_FRAMER_TU_CNT_RST_EN BIT(15)
+
+#define CDNS_DPTX_STREAM 0x03000
+#define CDNS_DP_MSA_HORIZONTAL_0 (CDNS_DPTX_STREAM + 0x00)
+#define CDNS_DP_MSAH0_H_TOTAL(x) (x)
+#define CDNS_DP_MSAH0_HSYNC_START(x) ((x) << 16)
+
+#define CDNS_DP_MSA_HORIZONTAL_1 (CDNS_DPTX_STREAM + 0x04)
+#define CDNS_DP_MSAH1_HSYNC_WIDTH(x) (x)
+#define CDNS_DP_MSAH1_HSYNC_POL_LOW BIT(15)
+#define CDNS_DP_MSAH1_HDISP_WIDTH(x) ((x) << 16)
+
+#define CDNS_DP_MSA_VERTICAL_0 (CDNS_DPTX_STREAM + 0x08)
+#define CDNS_DP_MSAV0_V_TOTAL(x) (x)
+#define CDNS_DP_MSAV0_VSYNC_START(x) ((x) << 16)
+
+#define CDNS_DP_MSA_VERTICAL_1 (CDNS_DPTX_STREAM + 0x0c)
+#define CDNS_DP_MSAV1_VSYNC_WIDTH(x) (x)
+#define CDNS_DP_MSAV1_VSYNC_POL_LOW BIT(15)
+#define CDNS_DP_MSAV1_VDISP_WIDTH(x) ((x) << 16)
+
+#define CDNS_DP_MSA_MISC (CDNS_DPTX_STREAM + 0x10)
+#define CDNS_DP_STREAM_CONFIG (CDNS_DPTX_STREAM + 0x14)
+#define CDNS_DP_RATE_GOVERNOR_STATUS (CDNS_DPTX_STREAM + 0x2c)
+#define CDNS_DP_RG_TU_VS_DIFF(x) ((x) << 8)
+
+#define CDNS_DP_HORIZONTAL (CDNS_DPTX_STREAM + 0x30)
+#define CDNS_DP_H_HSYNC_WIDTH(x) (x)
+#define CDNS_DP_H_H_TOTAL(x) ((x) << 16)
+
+#define CDNS_DP_VERTICAL_0 (CDNS_DPTX_STREAM + 0x34)
+#define CDNS_DP_V0_VHEIGHT(x) (x)
+#define CDNS_DP_V0_VSTART(x) ((x) << 16)
+
+#define CDNS_DP_VERTICAL_1 (CDNS_DPTX_STREAM + 0x38)
+#define CDNS_DP_V1_VTOTAL(x) (x)
+#define CDNS_DP_V1_VTOTAL_EVEN BIT(16)
+
+#define CDNS_DP_FRAMER_PXL_REPR (CDNS_DPTX_STREAM + 0x4c)
+#define CDNS_DP_FRAMER_6_BPC BIT(0)
+#define CDNS_DP_FRAMER_8_BPC BIT(1)
+#define CDNS_DP_FRAMER_10_BPC BIT(2)
+#define CDNS_DP_FRAMER_12_BPC BIT(3)
+#define CDNS_DP_FRAMER_16_BPC BIT(4)
+#define CDNS_DP_FRAMER_PXL_FORMAT 0x8
+#define CDNS_DP_FRAMER_RGB BIT(0)
+#define CDNS_DP_FRAMER_YCBCR444 BIT(1)
+#define CDNS_DP_FRAMER_YCBCR422 BIT(2)
+#define CDNS_DP_FRAMER_YCBCR420 BIT(3)
+#define CDNS_DP_FRAMER_Y_ONLY BIT(4)
+
+#define CDNS_DP_FRAMER_SP (CDNS_DPTX_STREAM + 0x10)
+#define CDNS_DP_FRAMER_VSYNC_POL_LOW BIT(0)
+#define CDNS_DP_FRAMER_HSYNC_POL_LOW BIT(1)
+#define CDNS_DP_FRAMER_INTERLACE BIT(2)
+
+#define CDNS_DP_LINE_THRESH (CDNS_DPTX_STREAM + 0x64)
+#define CDNS_DP_VB_ID (CDNS_DPTX_STREAM + 0x68)
+#define CDNS_DP_VB_ID_INTERLACED BIT(2)
+
+#define CDNS_DP_FRONT_BACK_PORCH (CDNS_DPTX_STREAM + 0x78)
+#define CDNS_DP_BACK_PORCH(x) (x)
+#define CDNS_DP_FRONT_PORCH(x) ((x) << 16)
+
+#define CDNS_DP_BYTE_COUNT (CDNS_DPTX_STREAM + 0x7c)
+
+#define CDNS_DPTX_GLOBAL 0x02300
+#define CDNS_DP_LANE_EN (CDNS_DPTX_GLOBAL + 0x00)
+#define CDNS_DP_LANE_EN_LANES(x) GENMASK(x - 1, 0)
+#define CDNS_DP_ENHNCD (CDNS_DPTX_GLOBAL + 0x04)
+
+#define CDNS_MHDP_IMEM 0x10000
+#define CDNS_MHDP_DMEM 0x20000
+
+#define CDNS_DP_TRAINING_PATTERN_4 0x7
+
+/* 3min delay because of EDID mb being VERY slow */
+/* FIXME: should be >615000 when upstreaming */
+#define CDNS_TIMEOUT_MAILBOX (1000 * 1000 * 60 * 3)
+
+/* FIXME: Should be 2000 */
+#define CDNS_KEEP_ALIVE_TIMEOUT 40000
+#define CDNS_SW_EVENT0_TIMEOUT 40000
+
+static const struct of_device_id mhdp_ids[] = {
+ { .compatible = "cdns,mhdp8546", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mhdp_ids);
+
+#define CDNS_LANE_1 BIT(0)
+#define CDNS_LANE_2 BIT(1)
+#define CDNS_LANE_4 BIT(2)
+#define CDNS_SSC BIT(3)
+#define CDNS_SCRAMBLER BIT(4)
+
+#define CDNS_VOLT_SWING(x) ((x) & GENMASK(1, 0))
+#define CDNS_FORCE_VOLT_SWING BIT(2)
+
+#define CDNS_PRE_EMPHASIS(x) ((x) & GENMASK(1, 0))
+#define CDNS_FORCE_PRE_EMPHASIS BIT(2)
+
+#define CDNS_SUPPORT_TPS(x) BIT((x) - 1)
+
+#define CDNS_FAST_LINK_TRAINING BIT(0)
+
+#define CDNS_LANE_MAPPING_TYPE_C_LANE_0(x) ((x) & GENMASK(1, 0))
+#define CDNS_LANE_MAPPING_TYPE_C_LANE_1(x) ((x) & GENMASK(3, 2))
+#define CDNS_LANE_MAPPING_TYPE_C_LANE_2(x) ((x) & GENMASK(5, 4))
+#define CDNS_LANE_MAPPING_TYPE_C_LANE_3(x) ((x) & GENMASK(7, 6))
+#define CDNS_LANE_MAPPING_NORMAL 0xe4
+#define CDNS_LANE_MAPPING_FLIPPED 0x1b
+
+#define CDNS_DP_MAX_NUM_LANES 4
+#define CDNS_DP_TEST_VSC_SDP (1 << 6) /* 1.3+ */
+#define CDNS_DP_TEST_COLOR_FORMAT_RAW_Y_ONLY (1 << 7)
+
+static inline struct cdns_mhdp_device *connector_to_mhdp(
+ struct drm_connector *conn)
+{
+ return container_of(conn, struct cdns_mhdp_device, connector);
+}
+
+static inline struct cdns_mhdp_device *bridge_to_mhdp(
+ struct drm_bridge *bridge)
+{
+ return container_of(bridge, struct cdns_mhdp_device, bridge);
+}
+
+static unsigned int max_link_rate(struct cdns_mhdp_host host,
+ struct cdns_mhdp_sink sink)
+{
+ return min(host.link_rate, sink.link_rate);
+}
+
+static u8 eq_training_pattern_supported(struct cdns_mhdp_host host,
+ struct cdns_mhdp_sink sink)
+{
+ return fls(host.pattern_supp & sink.pattern_supp);
+}
+
+static ssize_t mhdp_transfer(struct drm_dp_aux *aux,
+ struct drm_dp_aux_msg *msg)
+{
+ struct cdns_mhdp_device *mhdp = dev_get_drvdata(aux->dev);
+ int ret;
+
+ if (msg->request != DP_AUX_NATIVE_WRITE &&
+ msg->request != DP_AUX_NATIVE_READ)
+ return -ENOTSUPP;
+
+ if (msg->request == DP_AUX_NATIVE_WRITE) {
+ int i;
+
+ for (i = 0; i < msg->size; ++i) {
+ ret = cdns_mhdp_dpcd_write(mhdp,
+ msg->address + i,
+ *((u8 *)msg->buffer + i));
+ if (!ret)
+ continue;
+
+ DRM_DEV_ERROR(mhdp->dev, "Failed to write DPCD\n");
+
+ return i;
+ }
+ } else {
+ ret = cdns_mhdp_dpcd_read(mhdp, msg->address,
+ msg->buffer, msg->size);
+ if (ret) {
+ DRM_DEV_ERROR(mhdp->dev, "Failed to read DPCD\n");
+ return 0;
+ }
+ }
+
+ return msg->size;
+}
+
+static int cdns_mhdp_get_modes(struct drm_connector *connector)
+{
+ struct cdns_mhdp_device *mhdp = connector_to_mhdp(connector);
+ struct edid *edid;
+ int num_modes;
+
+ edid = drm_do_get_edid(connector, cdns_mhdp_get_edid_block, mhdp);
+
+ drm_connector_update_edid_property(connector, edid);
+
+ num_modes = drm_add_edid_modes(connector, edid);
+
+ return num_modes;
+}
+
+static const struct drm_connector_helper_funcs cdns_mhdp_conn_helper_funcs = {
+ .get_modes = cdns_mhdp_get_modes,
+};
+
+static enum drm_connector_status cdns_mhdp_detect(struct drm_connector *conn,
+ bool force)
+{
+ struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn);
+ enum drm_connector_status status = connector_status_disconnected;
+ int ret;
+
+ ret = cdns_mhdp_get_hpd_status(mhdp);
+ if (ret > 0)
+ status = connector_status_connected;
+ else if (ret < 0)
+ dev_err(mhdp->dev, "Failed to obtain HPD state\n");
+
+ return status;
+}
+
+static const struct drm_connector_funcs cdns_mhdp_conn_funcs = {
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+ .reset = drm_atomic_helper_connector_reset,
+ .destroy = drm_connector_cleanup,
+ .dpms = drm_helper_connector_dpms,
+ .detect = cdns_mhdp_detect,
+};
+
+static int cdns_mhdp_attach(struct drm_bridge *bridge)
+{
+ struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
+ struct drm_connector *conn = &mhdp->connector;
+ int ret;
+
+ conn->polled = DRM_CONNECTOR_POLL_CONNECT |
+ DRM_CONNECTOR_POLL_DISCONNECT;
+
+ ret = drm_connector_init(bridge->dev, conn, &cdns_mhdp_conn_funcs,
+ DRM_MODE_CONNECTOR_DisplayPort);
+ if (ret) {
+ dev_err(mhdp->dev, "failed to init connector\n");
+ return ret;
+ }
+
+ drm_connector_helper_add(conn, &cdns_mhdp_conn_helper_funcs);
+
+ ret = drm_connector_attach_encoder(conn, bridge->encoder);
+ if (ret) {
+ dev_err(mhdp->dev, "failed to attach connector to encoder\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+enum pixel_format {
+ PIXEL_FORMAT_RGB = 1,
+ PIXEL_FORMAT_YCBCR_444 = 2,
+ PIXEL_FORMAT_YCBCR_422 = 4,
+ PIXEL_FORMAT_YCBCR_420 = 8,
+ PIXEL_FORMAT_Y_ONLY = 16,
+};
+
+static void mhdp_link_training_init(struct cdns_mhdp_device *mhdp)
+{
+ u32 reg32;
+
+ drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_DISABLE);
+
+ /* Reset PHY configuration */
+ reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1);
+ if (!(mhdp->host.lanes_cnt & CDNS_SCRAMBLER))
+ reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_ENHNCD,
+ mhdp->sink.enhanced & mhdp->host.enhanced);
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_LANE_EN,
+ CDNS_DP_LANE_EN_LANES(mhdp->link.num_lanes));
+
+ drm_dp_link_configure(&mhdp->aux, &mhdp->link);
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG,
+ CDNS_PHY_COMMON_CONFIG |
+ CDNS_PHY_TRAINING_EN |
+ CDNS_PHY_TRAINING_TYPE(1) |
+ CDNS_PHY_SCRAMBLER_BYPASS);
+
+ drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE);
+}
+
+static void mhdp_get_adjust_train(struct cdns_mhdp_device *mhdp,
+ u8 link_status[DP_LINK_STATUS_SIZE],
+ u8 lanes_data[CDNS_DP_MAX_NUM_LANES])
+{
+ unsigned int i;
+ u8 adjust, max_pre_emphasis, max_volt_swing;
+
+ max_pre_emphasis = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis)
+ << DP_TRAIN_PRE_EMPHASIS_SHIFT;
+ max_volt_swing = CDNS_VOLT_SWING(mhdp->host.volt_swing);
+
+ for (i = 0; i < mhdp->link.num_lanes; i++) {
+ adjust = drm_dp_get_adjust_request_voltage(link_status, i);
+ lanes_data[i] = min_t(u8, adjust, max_volt_swing);
+ if (lanes_data[i] != adjust)
+ lanes_data[i] |= DP_TRAIN_MAX_SWING_REACHED;
+
+ adjust = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
+ lanes_data[i] |= min_t(u8, adjust, max_pre_emphasis);
+ if ((lanes_data[i] >> DP_TRAIN_PRE_EMPHASIS_SHIFT) != adjust)
+ lanes_data[i] |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
+ }
+}
+
+static void mhdp_set_adjust_request_voltage(
+ u8 link_status[DP_LINK_STATUS_SIZE], int lane, u8 volt)
+{
+ int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
+ int s = ((lane & 1) ?
+ DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
+ DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
+ int idx = i - DP_LANE0_1_STATUS;
+
+ link_status[idx] &= ~(DP_ADJUST_VOLTAGE_SWING_LANE0_MASK << s);
+ link_status[idx] |= volt << s;
+}
+
+static void mhdp_set_adjust_request_pre_emphasis(
+ u8 link_status[DP_LINK_STATUS_SIZE], int lane, u8 pre_emphasis)
+{
+ int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
+ int s = ((lane & 1) ?
+ DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
+ DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
+ int idx = i - DP_LANE0_1_STATUS;
+
+ link_status[idx] &= ~(DP_ADJUST_PRE_EMPHASIS_LANE0_MASK << s);
+ link_status[idx] |= pre_emphasis << s;
+}
+
+static void mhdp_adjust_requested_eq(struct cdns_mhdp_device *mhdp,
+ u8 link_status[DP_LINK_STATUS_SIZE])
+{
+ unsigned int i;
+ u8 pre, volt, max_pre = CDNS_VOLT_SWING(mhdp->host.volt_swing),
+ max_volt = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis);
+
+ for (i = 0; i < mhdp->link.num_lanes; i++) {
+ volt = drm_dp_get_adjust_request_voltage(link_status, i);
+ pre = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
+ if (volt + pre > 3)
+ mhdp_set_adjust_request_voltage(link_status, i,
+ 3 - pre);
+ if (mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING)
+ mhdp_set_adjust_request_voltage(link_status, i,
+ max_volt);
+ if (mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS)
+ mhdp_set_adjust_request_pre_emphasis(link_status, i,
+ max_pre);
+ }
+}
+
+static bool mhdp_link_training_channel_eq(struct cdns_mhdp_device *mhdp,
+ u8 eq_tps,
+ unsigned int training_interval)
+{
+ u8 lanes_data[CDNS_DP_MAX_NUM_LANES], fail_counter_short = 0;
+ u8 dpcd[DP_LINK_STATUS_SIZE];
+ u32 reg32;
+
+ dev_dbg(mhdp->dev, "Link training - Starting EQ phase\n");
+
+ /* Enable link training TPS[eq_tps] in PHY */
+ reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_EN |
+ CDNS_PHY_TRAINING_TYPE(eq_tps);
+ if (eq_tps != 4)
+ reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
+ cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
+
+ drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
+ (eq_tps != 4) ? eq_tps | DP_LINK_SCRAMBLING_DISABLE :
+ CDNS_DP_TRAINING_PATTERN_4);
+
+ drm_dp_dpcd_read_link_status(&mhdp->aux, dpcd);
+
+ do {
+ mhdp_get_adjust_train(mhdp, dpcd, lanes_data);
+
+ cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes,
+ training_interval, lanes_data, dpcd);
+
+ if (!drm_dp_clock_recovery_ok(dpcd, mhdp->link.num_lanes))
+ goto err;
+
+ if (drm_dp_channel_eq_ok(dpcd, mhdp->link.num_lanes)) {
+ dev_dbg(mhdp->dev,
+ "Link training: EQ phase succeeded\n");
+ return true;
+ }
+
+ fail_counter_short++;
+
+ mhdp_adjust_requested_eq(mhdp, dpcd);
+ } while (fail_counter_short < 5);
+
+err:
+ dev_dbg(mhdp->dev,
+ "Link training - EQ phase failed for %d lanes and %d rate\n",
+ mhdp->link.num_lanes, mhdp->link.rate);
+
+ return false;
+}
+
+static void mhdp_adjust_requested_cr(struct cdns_mhdp_device *mhdp,
+ u8 link_status[DP_LINK_STATUS_SIZE],
+ u8 *req_volt, u8 *req_pre)
+{
+ unsigned int i, max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing),
+ max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis);
+
+ for (i = 0; i < mhdp->link.num_lanes; i++) {
+ if (mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING)
+ mhdp_set_adjust_request_voltage(link_status, i,
+ max_volt);
+ else
+ mhdp_set_adjust_request_voltage(link_status, i,
+ req_volt[i]);
+
+ if (mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS)
+ mhdp_set_adjust_request_pre_emphasis(link_status, i,
+ max_pre);
+ else
+ mhdp_set_adjust_request_pre_emphasis(link_status, i,
+ req_pre[i]);
+ }
+}
+
+static void mhdp_validate_cr(struct cdns_mhdp_device *mhdp, bool *cr_done,
+ bool *same_before_adjust, bool *max_swing_reached,
+ u8 before_cr[DP_LINK_STATUS_SIZE],
+ u8 after_cr[DP_LINK_STATUS_SIZE], u8 *req_volt,
+ u8 *req_pre)
+{
+ unsigned int i;
+ u8 tmp, max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing),
+ max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis), lane_status;
+ bool same_pre, same_volt;
+
+ *same_before_adjust = false;
+ *max_swing_reached = false;
+ *cr_done = true;
+
+ for (i = 0; i < mhdp->link.num_lanes; i++) {
+ tmp = drm_dp_get_adjust_request_voltage(after_cr, i);
+ req_volt[i] = min_t(u8, tmp, max_volt);
+
+ tmp = drm_dp_get_adjust_request_pre_emphasis(after_cr, i) >>
+ DP_TRAIN_PRE_EMPHASIS_SHIFT;
+ req_pre[i] = min_t(u8, tmp, max_pre);
+
+ same_pre = (before_cr[i] & DP_TRAIN_PRE_EMPHASIS_MASK) ==
+ (req_pre[i] << DP_TRAIN_PRE_EMPHASIS_SHIFT);
+ same_volt = (before_cr[i] & DP_TRAIN_VOLTAGE_SWING_MASK) ==
+ req_volt[i];
+ if (same_pre && same_volt)
+ *same_before_adjust = true;
+
+ lane_status = drm_dp_get_lane_status(after_cr, i);
+ if (!(lane_status & DP_LANE_CR_DONE)) {
+ *cr_done = false;
+ /* 3.1.5.2 in DP Standard v1.4. Table 3-1 */
+ if (req_volt[i] + req_pre[i] >= 3) {
+ *max_swing_reached = true;
+ return;
+ }
+ }
+ }
+}
+
+static bool mhdp_link_training_clock_recovery(struct cdns_mhdp_device *mhdp)
+{
+ u8 lanes_data[CDNS_DP_MAX_NUM_LANES], fail_counter_short = 0,
+ fail_counter_cr_long = 0;
+ u8 dpcd[DP_LINK_STATUS_SIZE];
+ bool cr_done;
+
+ dev_dbg(mhdp->dev, "Link training starting CR phase\n");
+
+ mhdp_link_training_init(mhdp);
+
+ drm_dp_dpcd_read_link_status(&mhdp->aux, dpcd);
+
+ do {
+ u8 requested_adjust_volt_swing[CDNS_DP_MAX_NUM_LANES] = {},
+ requested_adjust_pre_emphasis[CDNS_DP_MAX_NUM_LANES] = {};
+ bool same_before_adjust, max_swing_reached;
+
+ mhdp_get_adjust_train(mhdp, dpcd, lanes_data);
+
+ cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes, 100,
+ lanes_data, dpcd);
+
+ mhdp_validate_cr(mhdp, &cr_done, &same_before_adjust,
+ &max_swing_reached, lanes_data, dpcd,
+ requested_adjust_volt_swing,
+ requested_adjust_pre_emphasis);
+
+ if (max_swing_reached)
+ goto err;
+
+ if (cr_done) {
+ dev_dbg(mhdp->dev,
+ "Link training: CR phase succeeded\n");
+ return true;
+ }
+
+ /* Not all CR_DONE bits set */
+ fail_counter_cr_long++;
+
+ if (same_before_adjust) {
+ fail_counter_short++;
+ continue;
+ }
+
+ fail_counter_short = 0;
+ /*
+ * Voltage swing/pre-emphasis adjust requested
+ * during CR phase
+ */
+ mhdp_adjust_requested_cr(mhdp, dpcd,
+ requested_adjust_volt_swing,
+ requested_adjust_pre_emphasis);
+ } while (fail_counter_short < 5 && fail_counter_cr_long < 10);
+
+err:
+ dev_dbg(mhdp->dev,
+ "Link training: CR phase failed for %d lanes and %d rate\n",
+ mhdp->link.num_lanes, mhdp->link.rate);
+
+ return false;
+}
+
+static void lower_link_rate(struct drm_dp_link *link)
+{
+ switch (drm_dp_link_rate_to_bw_code(link->rate)) {
+ case DP_LINK_BW_2_7:
+ link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_1_62);
+ break;
+ case DP_LINK_BW_5_4:
+ link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_2_7);
+ break;
+ case DP_LINK_BW_8_1:
+ link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4);
+ break;
+ }
+}
+
+static int mhdp_link_training(struct cdns_mhdp_device *mhdp,
+ unsigned int video_mode,
+ unsigned int training_interval)
+{
+ u32 reg32;
+ u8 eq_tps = eq_training_pattern_supported(mhdp->host, mhdp->sink);
+
+ while (1) {
+ if (!mhdp_link_training_clock_recovery(mhdp)) {
+ if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) !=
+ DP_LINK_BW_1_62) {
+ dev_dbg(mhdp->dev,
+ "Reducing link rate during CR phase\n");
+ lower_link_rate(&mhdp->link);
+ drm_dp_link_configure(&mhdp->aux, &mhdp->link);
+
+ continue;
+ } else if (mhdp->link.num_lanes > 1) {
+ dev_dbg(mhdp->dev,
+ "Reducing lanes number during CR phase\n");
+ mhdp->link.num_lanes >>= 1;
+ mhdp->link.rate = max_link_rate(mhdp->host,
+ mhdp->sink);
+ drm_dp_link_configure(&mhdp->aux, &mhdp->link);
+
+ continue;
+ }
+
+ dev_dbg(mhdp->dev,
+ "Link training failed during CR phase\n");
+ goto err;
+ }
+
+ if (mhdp_link_training_channel_eq(mhdp, eq_tps,
+ training_interval))
+ break;
+
+ if (mhdp->link.num_lanes > 1) {
+ dev_dbg(mhdp->dev,
+ "Reducing lanes number during EQ phase\n");
+ mhdp->link.num_lanes >>= 1;
+ drm_dp_link_configure(&mhdp->aux, &mhdp->link);
+
+ continue;
+ } else if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) !=
+ DP_LINK_BW_1_62) {
+ dev_dbg(mhdp->dev,
+ "Reducing link rate during EQ phase\n");
+ lower_link_rate(&mhdp->link);
+ drm_dp_link_configure(&mhdp->aux, &mhdp->link);
+
+ continue;
+ }
+
+ dev_dbg(mhdp->dev, "Link training failed during EQ phase\n");
+ goto err;
+ }
+
+ dev_dbg(mhdp->dev, "Link training successful\n");
+
+ drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
+ (mhdp->host.lanes_cnt & CDNS_SCRAMBLER) ? 0 :
+ DP_LINK_SCRAMBLING_DISABLE);
+
+ /* SW reset DPTX framer */
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_SW_RESET, 1);
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_SW_RESET, 0);
+
+ /* Enable framer */
+ /* FIXME: update when MST supported, BIT(2) */
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG,
+ CDNS_DP_FRAMER_EN |
+ CDNS_DP_NUM_LANES(mhdp->link.num_lanes) |
+ CDNS_DP_DISABLE_PHY_RST |
+ CDNS_DP_WR_FAILING_EDGE_VSYNC |
+ (!video_mode ? CDNS_DP_NO_VIDEO_MODE : 0));
+
+ /* Reset PHY config */
+ reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1);
+ if (!(mhdp->host.lanes_cnt & CDNS_SCRAMBLER))
+ reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
+ cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
+
+ return 0;
+err:
+ /* Reset PHY config */
+ reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1);
+ if (!(mhdp->host.lanes_cnt & CDNS_SCRAMBLER))
+ reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
+ cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
+
+ drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_DISABLE);
+
+ return -EIO;
+}
+
+static void cdns_mhdp_disable(struct drm_bridge *bridge)
+{
+ struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
+
+ cdns_mhdp_set_video_status(mhdp, 0);
+
+ drm_dp_link_power_down(&mhdp->aux, &mhdp->link);
+}
+
+static void cdns_mhdp_enable(struct drm_bridge *bridge)
+{
+ struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
+ struct drm_display_mode *mode;
+ struct drm_display_info *disp_info = &mhdp->connector.display_info;
+ enum pixel_format pxlfmt;
+ int pxlclock;
+ unsigned int rate, tu_size = 30, vs, vs_f, bpp, required_bandwidth,
+ available_bandwidth, dp_framer_sp = 0, msa_horizontal_1,
+ msa_vertical_1, bnd_hsync2vsync, hsync2vsync_pol_ctrl,
+ misc0 = 0, misc1 = 0, line_thresh = 0, pxl_repr,
+ front_porch, back_porch, msa_h0, msa_v0, hsync, vsync,
+ dp_vertical_1, line_thresh1, line_thresh2;
+ u32 resp;
+
+ unsigned int size = DP_RECEIVER_CAP_SIZE, dp_framer_global_config,
+ video_mode, training_interval_us;
+ u8 reg0[size], reg8, amp[2];
+
+ mode = &bridge->encoder->crtc->state->adjusted_mode;
+ pxlclock = mode->crtc_clock;
+
+ /*
+ * Upon power-on reset/device disconnection: [2:0] bits should be 0b001
+ * and [7:5] bits 0b000.
+ */
+ drm_dp_dpcd_writeb(&mhdp->aux, DP_SET_POWER, 1);
+
+ drm_dp_link_probe(&mhdp->aux, &mhdp->link);
+
+ dev_dbg(mhdp->dev, "Set sink device power state via DPCD\n");
+ drm_dp_link_power_up(&mhdp->aux, &mhdp->link);
+ /* FIXME (CDNS): do we have to wait for 100ms before going on? */
+ mdelay(100);
+
+ mhdp->sink.link_rate = mhdp->link.rate;
+ mhdp->sink.lanes_cnt = mhdp->link.num_lanes;
+ mhdp->sink.enhanced = !!(mhdp->link.capabilities &
+ DP_LINK_CAP_ENHANCED_FRAMING);
+
+ drm_dp_dpcd_read(&mhdp->aux, DP_DPCD_REV, reg0, size);
+
+ mhdp->sink.pattern_supp = CDNS_SUPPORT_TPS(1) | CDNS_SUPPORT_TPS(2);
+ if (drm_dp_tps3_supported(reg0))
+ mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(3);
+ if (drm_dp_tps4_supported(reg0))
+ mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(4);
+
+ mhdp->sink.fast_link = !!(reg0[DP_MAX_DOWNSPREAD] &
+ DP_NO_AUX_HANDSHAKE_LINK_TRAINING);
+
+ mhdp->link.rate = max_link_rate(mhdp->host, mhdp->sink);
+ mhdp->link.num_lanes = min_t(u8, mhdp->sink.lanes_cnt,
+ mhdp->host.lanes_cnt & GENMASK(2, 0));
+
+ reg8 = reg0[DP_TRAINING_AUX_RD_INTERVAL] &
+ DP_TRAINING_AUX_RD_MASK;
+ switch (reg8) {
+ case 0:
+ training_interval_us = 400;
+ break;
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ training_interval_us = 4000 << (reg8 - 1);
+ break;
+ default:
+ dev_err(mhdp->dev,
+ "wrong training interval returned by DPCD: %d\n", reg8);
+ return;
+ }
+
+ cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &resp);
+
+ dp_framer_global_config = be32_to_cpu(resp);
+
+ video_mode = !(dp_framer_global_config & CDNS_DP_NO_VIDEO_MODE);
+
+ if (dp_framer_global_config & CDNS_DP_FRAMER_EN)
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG,
+ dp_framer_global_config &
+ ~CDNS_DP_FRAMER_EN);
+
+ /* Spread AMP if required, enable 8b/10b coding */
+ amp[0] = (mhdp->host.lanes_cnt & CDNS_SSC) ? DP_SPREAD_AMP_0_5 : 0;
+ amp[1] = DP_SET_ANSI_8B10B;
+ drm_dp_dpcd_write(&mhdp->aux, DP_DOWNSPREAD_CTRL, amp, 2);
+
+ if (mhdp->host.fast_link & mhdp->sink.fast_link) {
+ /* FIXME: implement fastlink */
+ dev_dbg(mhdp->dev, "fastlink\n");
+ } else {
+ if (mhdp_link_training(mhdp, video_mode,
+ training_interval_us)) {
+ dev_err(mhdp->dev, "Link training failed. Exiting.\n");
+ return;
+ }
+ }
+
+ rate = mhdp->link.rate / 1000;
+
+ /* FIXME: what about Y_ONLY? how is it handled in the kernel? */
+ if (disp_info->color_formats & DRM_COLOR_FORMAT_YCRCB444)
+ pxlfmt = PIXEL_FORMAT_YCBCR_444;
+ else if (disp_info->color_formats & DRM_COLOR_FORMAT_YCRCB422)
+ pxlfmt = PIXEL_FORMAT_YCBCR_422;
+ else if (disp_info->color_formats & DRM_COLOR_FORMAT_YCRCB420)
+ pxlfmt = PIXEL_FORMAT_YCBCR_420;
+ else
+ pxlfmt = PIXEL_FORMAT_RGB;
+
+ /* if YCBCR supported and stream not SD, use ITU709 */
+ /* FIXME: handle ITU version with YCBCR420 when supported */
+ if ((pxlfmt == PIXEL_FORMAT_YCBCR_444 ||
+ pxlfmt == PIXEL_FORMAT_YCBCR_422) && mode->crtc_vdisplay >= 720)
+ misc0 = DP_YCBCR_COEFFICIENTS_ITU709;
+
+ switch (pxlfmt) {
+ case PIXEL_FORMAT_RGB:
+ bpp = disp_info->bpc * 3;
+ pxl_repr = CDNS_DP_FRAMER_RGB << CDNS_DP_FRAMER_PXL_FORMAT;
+ misc0 |= DP_COLOR_FORMAT_RGB;
+ break;
+ case PIXEL_FORMAT_YCBCR_444:
+ bpp = disp_info->bpc * 3;
+ pxl_repr = CDNS_DP_FRAMER_YCBCR444 << CDNS_DP_FRAMER_PXL_FORMAT;
+ misc0 |= DP_COLOR_FORMAT_YCbCr444 | DP_TEST_DYNAMIC_RANGE_CEA;
+ break;
+ case PIXEL_FORMAT_YCBCR_422:
+ bpp = disp_info->bpc * 2;
+ pxl_repr = CDNS_DP_FRAMER_YCBCR422 << CDNS_DP_FRAMER_PXL_FORMAT;
+ misc0 |= DP_COLOR_FORMAT_YCbCr422 | DP_TEST_DYNAMIC_RANGE_CEA;
+ break;
+ case PIXEL_FORMAT_YCBCR_420:
+ bpp = disp_info->bpc * 3 / 2;
+ pxl_repr = CDNS_DP_FRAMER_YCBCR420 << CDNS_DP_FRAMER_PXL_FORMAT;
+ break;
+ default:
+ bpp = disp_info->bpc;
+ pxl_repr = CDNS_DP_FRAMER_Y_ONLY << CDNS_DP_FRAMER_PXL_FORMAT;
+ }
+
+ switch (disp_info->bpc) {
+ case 6:
+ misc0 |= DP_TEST_BIT_DEPTH_6;
+ pxl_repr |= CDNS_DP_FRAMER_6_BPC;
+ break;
+ case 8:
+ misc0 |= DP_TEST_BIT_DEPTH_8;
+ pxl_repr |= CDNS_DP_FRAMER_8_BPC;
+ break;
+ case 10:
+ misc0 |= DP_TEST_BIT_DEPTH_10;
+ pxl_repr |= CDNS_DP_FRAMER_10_BPC;
+ break;
+ case 12:
+ misc0 |= DP_TEST_BIT_DEPTH_12;
+ pxl_repr |= CDNS_DP_FRAMER_12_BPC;
+ break;
+ case 16:
+ misc0 |= DP_TEST_BIT_DEPTH_16;
+ pxl_repr |= CDNS_DP_FRAMER_16_BPC;
+ break;
+ }
+
+ /* find optimal tu_size */
+ required_bandwidth = pxlclock * bpp / 8;
+ available_bandwidth = mhdp->link.num_lanes * rate;
+ do {
+ tu_size += 2;
+
+ vs_f = tu_size * required_bandwidth / available_bandwidth;
+ vs = vs_f / 1000;
+ vs_f = vs_f % 1000;
+ /*
+ * FIXME (CDNS): downspreading?
+ * It's unused is what I've been told.
+ */
+ } while ((vs == 1 || ((vs_f > 850 || vs_f < 100) && vs_f != 0) ||
+ tu_size - vs < 2) && tu_size < 64);
+
+ if (vs > 64)
+ return;
+
+ bnd_hsync2vsync = CDNS_IP_BYPASS_V_INTERFACE;
+ if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+ bnd_hsync2vsync |= CDNS_IP_DET_INTERLACE_FORMAT;
+
+ cdns_mhdp_reg_write(mhdp, CDNS_BND_HSYNC2VSYNC, bnd_hsync2vsync);
+
+ if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
+ mode->flags & DRM_MODE_FLAG_PHSYNC)
+ hsync2vsync_pol_ctrl = CDNS_H2V_HSYNC_POL_ACTIVE_LOW |
+ CDNS_H2V_VSYNC_POL_ACTIVE_LOW;
+ else
+ hsync2vsync_pol_ctrl = 0;
+
+ cdns_mhdp_reg_write(mhdp, CDNS_HSYNC2VSYNC_POL_CTRL,
+ hsync2vsync_pol_ctrl);
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_TU,
+ CDNS_DP_FRAMER_TU_VS(vs) |
+ CDNS_DP_FRAMER_TU_SIZE(tu_size) |
+ CDNS_DP_FRAMER_TU_CNT_RST_EN);
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_PXL_REPR, pxl_repr);
+
+ if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+ dp_framer_sp |= CDNS_DP_FRAMER_INTERLACE;
+ if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+ dp_framer_sp |= CDNS_DP_FRAMER_HSYNC_POL_LOW;
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+ dp_framer_sp |= CDNS_DP_FRAMER_VSYNC_POL_LOW;
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_SP, dp_framer_sp);
+
+ front_porch = mode->crtc_hsync_start - mode->crtc_hdisplay;
+ back_porch = mode->crtc_htotal - mode->crtc_hsync_end;
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_FRONT_BACK_PORCH,
+ CDNS_DP_FRONT_PORCH(front_porch) |
+ CDNS_DP_BACK_PORCH(back_porch));
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_BYTE_COUNT,
+ mode->crtc_hdisplay * bpp / 8);
+
+ msa_h0 = mode->crtc_htotal - mode->crtc_hsync_start;
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_0,
+ CDNS_DP_MSAH0_H_TOTAL(mode->crtc_htotal) |
+ CDNS_DP_MSAH0_HSYNC_START(msa_h0));
+
+ hsync = mode->crtc_hsync_end - mode->crtc_hsync_start;
+ msa_horizontal_1 = CDNS_DP_MSAH1_HSYNC_WIDTH(hsync) |
+ CDNS_DP_MSAH1_HDISP_WIDTH(mode->crtc_hdisplay);
+ if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+ msa_horizontal_1 |= CDNS_DP_MSAH1_HSYNC_POL_LOW;
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_1,
+ msa_horizontal_1);
+
+ msa_v0 = mode->crtc_vtotal - mode->crtc_vsync_start;
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_0,
+ CDNS_DP_MSAV0_V_TOTAL(mode->crtc_vtotal) |
+ CDNS_DP_MSAV0_VSYNC_START(msa_v0));
+
+ vsync = mode->crtc_vsync_end - mode->crtc_vsync_start;
+ msa_vertical_1 = CDNS_DP_MSAV1_VSYNC_WIDTH(vsync) |
+ CDNS_DP_MSAV1_VDISP_WIDTH(mode->crtc_vdisplay);
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+ msa_vertical_1 |= CDNS_DP_MSAV1_VSYNC_POL_LOW;
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_1, msa_vertical_1);
+
+ if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
+ mode->crtc_vtotal % 2 == 0)
+ misc1 = DP_TEST_INTERLACED;
+ if (pxlfmt == PIXEL_FORMAT_Y_ONLY)
+ misc1 |= CDNS_DP_TEST_COLOR_FORMAT_RAW_Y_ONLY;
+ /* FIXME: use VSC SDP for Y420 */
+ /* FIXME: (CDNS) no code for Y420 in bare metal test */
+ if (pxlfmt == PIXEL_FORMAT_YCBCR_420)
+ misc1 = CDNS_DP_TEST_VSC_SDP;
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_MISC, misc0 | (misc1 << 8));
+
+ /* FIXME: to be changed if MST mode */
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_STREAM_CONFIG, 1);
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_HORIZONTAL,
+ CDNS_DP_H_HSYNC_WIDTH(hsync) |
+ CDNS_DP_H_H_TOTAL(mode->crtc_hdisplay));
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_0,
+ CDNS_DP_V0_VHEIGHT(mode->crtc_vdisplay) |
+ CDNS_DP_V0_VSTART(msa_v0));
+
+ dp_vertical_1 = CDNS_DP_V1_VTOTAL(mode->crtc_vtotal);
+ if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
+ mode->crtc_vtotal % 2 == 0)
+ dp_vertical_1 |= CDNS_DP_V1_VTOTAL_EVEN;
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_1, dp_vertical_1);
+
+ cdns_mhdp_reg_write_bit(mhdp, CDNS_DP_VB_ID, 2, 1,
+ (mode->flags & DRM_MODE_FLAG_INTERLACE) ?
+ CDNS_DP_VB_ID_INTERLACED : 0);
+
+ line_thresh1 = ((vs + 1) << 5) * 8 / bpp;
+ line_thresh2 = (pxlclock << 5) / 1000 / rate * (vs + 1) - (1 << 5);
+ line_thresh = line_thresh1 - line_thresh2 / mhdp->link.num_lanes;
+ line_thresh = (line_thresh >> 5) + 2;
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_LINE_THRESH,
+ line_thresh & GENMASK(5, 0));
+
+ cdns_mhdp_reg_write(mhdp, CDNS_DP_RATE_GOVERNOR_STATUS,
+ CDNS_DP_RG_TU_VS_DIFF((tu_size - vs > 3) ?
+ 0 : tu_size - vs));
+
+ cdns_mhdp_set_video_status(mhdp, 1);
+}
+
+static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = {
+ .enable = cdns_mhdp_enable,
+ .disable = cdns_mhdp_disable,
+ .attach = cdns_mhdp_attach,
+};
+
+static int load_firmware(struct cdns_mhdp_device *mhdp, const char *name,
+ unsigned int addr)
+{
+ const struct firmware *fw;
+ int ret;
+
+ ret = request_firmware(&fw, name, mhdp->dev);
+ if (ret) {
+ dev_err(mhdp->dev, "failed to load firmware (%s), ret: %d\n",
+ name, ret);
+ return ret;
+ }
+
+ memcpy_toio(mhdp->regs + addr, fw->data, fw->size);
+
+ release_firmware(fw);
+
+ return 0;
+}
+
+static int mhdp_probe(struct platform_device *pdev)
+{
+ struct resource *regs;
+ struct cdns_mhdp_device *mhdp;
+ struct clk *clk;
+ int ret;
+ unsigned int reg;
+ unsigned long rate;
+
+ mhdp = devm_kzalloc(&pdev->dev, sizeof(struct cdns_mhdp_device),
+ GFP_KERNEL);
+ if (!mhdp)
+ return -ENOMEM;
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "couldn't get clk: %ld\n", PTR_ERR(clk));
+ return PTR_ERR(clk);
+ }
+
+ mhdp->dev = &pdev->dev;
+ dev_set_drvdata(&pdev->dev, mhdp);
+
+ drm_dp_aux_init(&mhdp->aux);
+ mhdp->aux.dev = &pdev->dev;
+ mhdp->aux.transfer = mhdp_transfer;
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ mhdp->regs = devm_ioremap_resource(&pdev->dev, regs);
+ if (IS_ERR(mhdp->regs))
+ return PTR_ERR(mhdp->regs);
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ mhdp->dbg_regs = devm_ioremap_resource(&pdev->dev, regs);
+ if (IS_ERR(mhdp->dbg_regs))
+ return PTR_ERR(mhdp->dbg_regs);
+
+ platform_set_drvdata(pdev, mhdp);
+
+ ret = load_firmware(mhdp, IRAM_FW_NAME, CDNS_MHDP_IMEM);
+ if (ret)
+ return ret;
+
+ ret = load_firmware(mhdp, DRAM_FW_NAME, CDNS_MHDP_DMEM);
+ if (ret)
+ return ret;
+
+ rate = clk_get_rate(clk);
+ writel(rate % 1000000, mhdp->regs + CDNS_SW_CLK_L);
+ writel(rate / 1000000, mhdp->regs + CDNS_SW_CLK_H);
+
+ /* Leave debug mode */
+ writel(0, mhdp->regs + CDNS_APB_CTRL);
+
+ /*
+ * Wait for the KEEP_ALIVE "message" on the first 8 bits.
+ * Updated each sched "tick" (~2ms)
+ */
+ ret = readl_poll_timeout(mhdp->regs + CDNS_KEEP_ALIVE, reg,
+ reg & CDNS_KEEP_ALIVE_MASK, 500,
+ CDNS_KEEP_ALIVE_TIMEOUT);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "device didn't give any life sign: reg %d\n", reg);
+ return -EIO;
+ }
+
+ /*
+ * FIXME (CDNS): how are the characteristics/features of the host
+ * defined? Will they be always hardcoded?
+ */
+ /* FIXME: link rate 2.7; num_lanes = 2, */
+ /* FIXME: read capabilities from PHY */
+ mhdp->host.link_rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4);
+ mhdp->host.lanes_cnt = CDNS_LANE_4 | CDNS_SCRAMBLER;
+ mhdp->host.volt_swing = CDNS_VOLT_SWING(3);
+ mhdp->host.pre_emphasis = CDNS_PRE_EMPHASIS(2);
+ mhdp->host.pattern_supp = CDNS_SUPPORT_TPS(1) |
+ CDNS_SUPPORT_TPS(2) | CDNS_SUPPORT_TPS(3) |
+ CDNS_SUPPORT_TPS(4);
+ mhdp->host.fast_link = 0;
+ mhdp->host.lane_mapping = CDNS_LANE_MAPPING_FLIPPED;
+ mhdp->host.enhanced = true;
+
+ mhdp->bridge.of_node = pdev->dev.of_node;
+ mhdp->bridge.funcs = &cdns_mhdp_bridge_funcs;
+
+ /* Init events to 0 as it's not cleared by FW at boot but on read */
+ readl(mhdp->regs + CDNS_SW_EVENT0);
+ readl(mhdp->regs + CDNS_SW_EVENT1);
+ readl(mhdp->regs + CDNS_SW_EVENT2);
+ readl(mhdp->regs + CDNS_SW_EVENT3);
+
+ /* Activate uCPU */
+ ret = cdns_mhdp_set_firmware_active(mhdp, true);
+ if (ret) {
+ dev_err(mhdp->dev, "Failed to activate DP\n");
+ return ret;
+ }
+
+ /* Loop over HDP change */
+ /*
+ * FIXME: does not work when put in mhdp_bridge_enable.
+ * Where should we put it?
+ */
+ /* Is it still needed with use of mb message HPD STATUS? */
+ ret = readl_poll_timeout(mhdp->regs + CDNS_SW_EVENT0, reg,
+ reg & CDNS_DPTX_HPD, 500,
+ CDNS_SW_EVENT0_TIMEOUT);
+ if (ret) {
+ dev_err(mhdp->dev, "no HPD received %d\n", reg);
+ return -ENODEV;
+ }
+
+ drm_bridge_add(&mhdp->bridge);
+
+ return 0;
+}
+
+MODULE_FIRMWARE(IRAM_FW_NAME);
+MODULE_FIRMWARE(DRAM_FW_NAME);
+
+static int mhdp_remove(struct platform_device *pdev)
+{
+ struct cdns_mhdp_device *mhdp = dev_get_drvdata(&pdev->dev);
+ int ret;
+
+ drm_bridge_remove(&mhdp->bridge);
+
+ ret = cdns_mhdp_set_firmware_active(mhdp, false);
+ if (ret) {
+ dev_err(mhdp->dev, "Failed to de-activate DP\n");
+ return ret;
+ }
+
+ /* FIXME: check for missing functions */
+
+ return 0;
+}
+
+static struct platform_driver mhdp_driver = {
+ .driver = {
+ .name = "cdns-mhdp",
+ .of_match_table = of_match_ptr(mhdp_ids),
+ },
+ .probe = mhdp_probe,
+ .remove = mhdp_remove,
+};
+module_platform_driver(mhdp_driver);
+
+MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
+MODULE_DESCRIPTION("Cadence MHDP DP bridge driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:cdns-mhdp");
--
2.17.1