Re: [Intel-gfx] [RFC PATCH 3/6] drm/i915: Add HDCP framework + base implementation

Sean Paul
2017-12-01T14:14:12Z

On Fri, Dec 1, 2017 at 3:36 AM, Ramalingam C <ramalingam.c@intel.com> wrote:
>
>
>
> On Friday 01 December 2017 01:06 PM, Daniel Vetter wrote:
>>
>> On Fri, Dec 01, 2017 at 12:53:31PM +0530, Ramalingam C wrote:
>>>
>>> Sean,
>>>
>>> IMHO, it will good if we can have all generic hdcp1.4 authentication flow in
>>> drm helpers and all interested display drivers to use them.
>>>
>>> This Design will make the extending of hdcp easy for other display drivers
>>> based on DRM.
>>>
>>> We can have the required drm_hdcp_shim type of implementation at drm
>>> structure which will be called for platform specific operations (like
>>> prepare an, send aksv, program bksv/repeater/r0 and verify sha1 etc)?
>>
>> I discussed this exact question with Sean Paul, and apparently the
>> hardware designs are too diverse to make shared code much useful. Some hw
>> has the entire hdcp flow in hw, some almost nothing (like i915 here), and
>> then there's everything in between.
>
> Just trying to understand the other extreme of HW (full)support for HDCP here.
>
> When you say everything about HDCP is implemented in HW, do you mean that whole protocol comm on HDCP link also driven by HW?
>

Yep. Check out the rockchip implementation in our 4.4 tree.

Sean

>
> --Ram
>
>>
>> Given that Sean has seen a lot more hdcp implementations than we have,
>> that we right now have no other implementation than i915 in upstream and
>> than wrong abstraction is much harder to fix than no abstraction I'm going
>> with Sean's approach of "no generic abstraction" here. Personally I'm not
>> even fully sold on the shim abstraction, but I think by&large that one is
>> fine.
>>
>>> On Thursday 30 November 2017 08:38 AM, Sean Paul wrote:
>>>>
>>>> This patch adds the framework required to add HDCP support to intel
>>>> connectors. It implements Aksv loading from fuse, and parts 1/2/3
>>>> of the HDCP authentication scheme.
>>>>
>>>> Note that without shim implementations, this does not actually implement
>>>> HDCP. That will come in subsequent patches.
>>>>
>>>> Signed-off-by: Sean Paul <seanpaul@chromium.org>
>>>> ---
>>>> drivers/gpu/drm/i915/Makefile | 1 +
>>>> drivers/gpu/drm/i915/i915_reg.h | 83 +++++
>>>> drivers/gpu/drm/i915/intel_atomic.c | 26 +-
>>>> drivers/gpu/drm/i915/intel_ddi.c | 14 +
>>>> drivers/gpu/drm/i915/intel_drv.h | 53 +++
>>>> drivers/gpu/drm/i915/intel_hdcp.c | 636 ++++++++++++++++++++++++++++++++++++
>>>> 6 files changed, 811 insertions(+), 2 deletions(-)
>>>> create mode 100644 drivers/gpu/drm/i915/intel_hdcp.c
>>>>
>>>> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
>>>> index 6c3b0481ef82..1e745508e437 100644
>>>> --- a/drivers/gpu/drm/i915/Makefile
>>>> +++ b/drivers/gpu/drm/i915/Makefile
>>>> @@ -87,6 +87,7 @@ i915-y += intel_audio.o \
>>>> intel_fbc.o \
>>>> intel_fifo_underrun.o \
>>>> intel_frontbuffer.o \
>>>> + intel_hdcp.o \
>>>> intel_hotplug.o \
>>>> intel_modes.o \
>>>> intel_overlay.o \
>>>> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>>>> index 68a58cce6ab1..43128030171d 100644
>>>> --- a/drivers/gpu/drm/i915/i915_reg.h
>>>> +++ b/drivers/gpu/drm/i915/i915_reg.h
>>>> @@ -7991,6 +7991,7 @@ enum {
>>>> #define GEN9_MEM_LATENCY_LEVEL_1_5_SHIFT 8
>>>> #define GEN9_MEM_LATENCY_LEVEL_2_6_SHIFT 16
>>>> #define GEN9_MEM_LATENCY_LEVEL_3_7_SHIFT 24
>>>> +#define SKL_PCODE_LOAD_HDCP_KEYS 0x5
>>>> #define SKL_PCODE_CDCLK_CONTROL 0x7
>>>> #define SKL_CDCLK_PREPARE_FOR_CHANGE 0x3
>>>> #define SKL_CDCLK_READY_FOR_CHANGE 0x1
>>>> @@ -8285,6 +8286,88 @@ enum skl_power_gate {
>>>> #define SKL_PW_TO_PG(pw) ((pw) - SKL_DISP_PW_1 + SKL_PG1)
>>>> #define SKL_FUSE_PG_DIST_STATUS(pg) (1 << (27 - (pg)))
>>>> +
>>>> +/* HDCP Key Registers */
>>>> +#define SKL_HDCP_KEY_CONF _MMIO(0x66c00)
>>>> +#define SKL_HDCP_AKSV_SEND_TRIGGER BIT(31)
>>>> +#define SKL_HDCP_CLEAR_KEYS_TRIGGER BIT(30)
>>>> +#define SKL_HDCP_KEY_STATUS _MMIO(0x66c04)
>>>> +#define SKL_HDCP_FUSE_IN_PROGRESS BIT(7)
>>>> +#define SKL_HDCP_FUSE_ERROR BIT(6)
>>>> +#define SKL_HDCP_FUSE_DONE BIT(5)
>>>> +#define SKL_HDCP_KEY_LOAD_STATUS BIT(1)
>>>> +#define SKL_HDCP_KEY_LOAD_DONE BIT(0)
>>>> +#define SKL_HDCP_AKSV_LO _MMIO(0x66c10)
>>>> +#define SKL_HDCP_AKSV_HI _MMIO(0x66c14)
>>>> +
>>>> +/* HDCP Repeater Registers */
>>>> +#define SKL_HDCP_REP_CTL _MMIO(0x66d00)
>>>> +#define SKL_HDCP_DDIB_REP_PRESENT BIT(30)
>>>> +#define SKL_HDCP_DDIA_REP_PRESENT BIT(29)
>>>> +#define SKL_HDCP_DDIC_REP_PRESENT BIT(28)
>>>> +#define SKL_HDCP_DDID_REP_PRESENT BIT(27)
>>>> +#define SKL_HDCP_DDIF_REP_PRESENT BIT(26)
>>>> +#define SKL_HDCP_DDIE_REP_PRESENT BIT(25)
>>>> +#define SKL_HDCP_DDIB_SHA1_M0 (1 << 20)
>>>> +#define SKL_HDCP_DDIA_SHA1_M0 (2 << 20)
>>>> +#define SKL_HDCP_DDIC_SHA1_M0 (3 << 20)
>>>> +#define SKL_HDCP_DDID_SHA1_M0 (4 << 20)
>>>> +#define SKL_HDCP_DDIF_SHA1_M0 (5 << 20)
>>>> +#define SKL_HDCP_DDIE_SHA1_M0 (6 << 20) // Bspec says 5?
>>>> +#define SKL_HDCP_SHA1_BUSY BIT(16)
>>>> +#define SKL_HDCP_SHA1_READY BIT(17)
>>>> +#define SKL_HDCP_SHA1_COMPLETE BIT(18)
>>>> +#define SKL_HDCP_SHA1_V_MATCH BIT(19)
>>>> +#define SKL_HDCP_SHA1_TEXT_32 (1 << 1)
>>>> +#define SKL_HDCP_SHA1_COMPLETE_HASH (2 << 1)
>>>> +#define SKL_HDCP_SHA1_TEXT_24 (4 << 1)
>>>> +#define SKL_HDCP_SHA1_TEXT_16 (5 << 1)
>>>> +#define SKL_HDCP_SHA1_TEXT_8 (6 << 1)
>>>> +#define SKL_HDCP_SHA1_TEXT_0 (7 << 1)
>>>> +#define SKL_HDCP_SHA_V_PRIME_H0 _MMIO(0x66d04)
>>>> +#define SKL_HDCP_SHA_V_PRIME_H1 _MMIO(0x66d08)
>>>> +#define SKL_HDCP_SHA_V_PRIME_H2 _MMIO(0x66d0C)
>>>> +#define SKL_HDCP_SHA_V_PRIME_H3 _MMIO(0x66d10)
>>>> +#define SKL_HDCP_SHA_V_PRIME_H4 _MMIO(0x66d14)
>>>> +#define SKL_HDCP_SHA_V_PRIME(h) _MMIO((0x66d04 + h * 4))
>>>> +#define SKL_HDCP_SHA_TEXT _MMIO(0x66d18)
>>>> +
>>>> +/* HDCP Auth Registers */
>>>> +#define _SKL_PORTA_HDCP_AUTHENC 0x66800
>>>> +#define _SKL_PORTB_HDCP_AUTHENC 0x66500
>>>> +#define _SKL_PORTC_HDCP_AUTHENC 0x66600
>>>> +#define _SKL_PORTD_HDCP_AUTHENC 0x66700
>>>> +#define _SKL_PORTE_HDCP_AUTHENC 0x66A00
>>>> +#define _SKL_PORTF_HDCP_AUTHENC 0x66900
>>>> +#define _SKL_PORT_HDCP_AUTHENC(port, x) _MMIO(_PICK(port, \
>>>> + _SKL_PORTA_HDCP_AUTHENC, \
>>>> + _SKL_PORTB_HDCP_AUTHENC, \
>>>> + _SKL_PORTC_HDCP_AUTHENC, \
>>>> + _SKL_PORTD_HDCP_AUTHENC, \
>>>> + _SKL_PORTE_HDCP_AUTHENC, \
>>>> + _SKL_PORTF_HDCP_AUTHENC) + x)
>>>> +#define SKL_PORT_HDCP_CONF(port) _SKL_PORT_HDCP_AUTHENC(port, 0x0)
>>>> +#define SKL_HDCP_CONF_CAPTURE_AN BIT(0)
>>>> +#define SKL_HDCP_CONF_AUTH_AND_ENC (BIT(1) | BIT(0))
>>>> +#define SKL_PORT_HDCP_ANINIT(port) _SKL_PORT_HDCP_AUTHENC(port, 0x4)
>>>> +#define SKL_PORT_HDCP_ANLO(port) _SKL_PORT_HDCP_AUTHENC(port, 0x8)
>>>> +#define SKL_PORT_HDCP_ANHI(port) _SKL_PORT_HDCP_AUTHENC(port, 0xC)
>>>> +#define SKL_PORT_HDCP_BKSVLO(port) _SKL_PORT_HDCP_AUTHENC(port, 0x10)
>>>> +#define SKL_PORT_HDCP_BKSVHI(port) _SKL_PORT_HDCP_AUTHENC(port, 0x14)
>>>> +#define SKL_PORT_HDCP_RPRIME(port) _SKL_PORT_HDCP_AUTHENC(port, 0x18)
>>>> +#define SKL_PORT_HDCP_STATUS(port) _SKL_PORT_HDCP_AUTHENC(port, 0x1C)
>>>> +#define SKL_HDCP_STATUS_STREAM_A_ENC BIT(31)
>>>> +#define SKL_HDCP_STATUS_STREAM_B_ENC BIT(30)
>>>> +#define SKL_HDCP_STATUS_STREAM_C_ENC BIT(29)
>>>> +#define SKL_HDCP_STATUS_STREAM_D_ENC BIT(28)
>>>> +#define SKL_HDCP_STATUS_AUTH BIT(21)
>>>> +#define SKL_HDCP_STATUS_ENC BIT(20)
>>>> +#define SKL_HDCP_STATUS_RI_MATCH BIT(19)
>>>> +#define SKL_HDCP_STATUS_R0_READY BIT(18)
>>>> +#define SKL_HDCP_STATUS_AN_READY BIT(17)
>>>> +#define SKL_HDCP_STATUS_CIPHER BIT(16)
>>>> +#define SKL_HDCP_STATUS_FRAME_CNT(x) ((x >> 8) & 0xff)
>>>> +
>>>> /* Per-pipe DDI Function Control */
>>>> #define _TRANS_DDI_FUNC_CTL_A 0x60400
>>>> #define _TRANS_DDI_FUNC_CTL_B 0x61400
>>>> diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
>>>> index 36d4e635e4ce..ddf08227d9cb 100644
>>>> --- a/drivers/gpu/drm/i915/intel_atomic.c
>>>> +++ b/drivers/gpu/drm/i915/intel_atomic.c
>>>> @@ -109,12 +109,34 @@ int intel_digital_connector_atomic_check(struct drm_connector *conn,
>>>> struct intel_digital_connector_state *old_conn_state =
>>>> to_intel_digital_connector_state(old_state);
>>>> struct drm_crtc_state *crtc_state;
>>>> -
>>>> - if (!new_state->crtc)
>>>> + uint64_t old_cp = old_conn_state->base.content_protection;
>>>> + uint64_t new_cp = new_state->content_protection;
>>>> +
>>>> + if (!new_state->crtc) {
>>>> + /*
>>>> + * If the connector is being disabled with CP enabled, mark it
>>>> + * desired so it's re-enabled when the connector is brought back
>>>> + */
>>>> + if (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)
>>>> + new_state->content_protection =
>>>> + DRM_MODE_CONTENT_PROTECTION_DESIRED;
>>>> return 0;
>>>> + }
>>>> crtc_state = drm_atomic_get_new_crtc_state(new_state->state, new_state->crtc);
>>>> + if (new_cp != old_cp) {
>>>> + /* Only drivers can set content protection enabled */
>>>> + if (new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)
>>>> + new_state->content_protection =
>>>> + DRM_MODE_CONTENT_PROTECTION_DESIRED;
>>>> +
>>>> + /* Involve the encoder/connector to enable/disable CP */
>>>> + if (new_cp == DRM_MODE_CONTENT_PROTECTION_OFF ||
>>>> + old_cp == DRM_MODE_CONTENT_PROTECTION_OFF)
>>>> + crtc_state->mode_changed = true;
>>>
>>> We need not perform the mode set for hdcp enable/disable.
>>> Authentication and encryption can be started on active port.
>>
>> Was simpler to implement this way :-) We can fix this by pushing the hdcp
>> enable/disable code into a post-modeset operation. Ville had written the
>> infrastructure for that to fix a few fastboot corner cases. But that
>> infrastructure hasn't landed yet, so probably better to do that in a
>> follow-up.
>>
>> I also guess that CrOS simply set this to desired every time they enable
>> an external screen, so it won't result in an unecessary modeset.
>>
>>>> + }
>>>> +
>>>> /*
>>>> * These properties are handled by fastset, and might not end
>>>> * up in a modeset.
>>>> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
>>>> index 933c18fd4258..0e69337f410d 100644
>>>> --- a/drivers/gpu/drm/i915/intel_ddi.c
>>>> +++ b/drivers/gpu/drm/i915/intel_ddi.c
>>>> @@ -2432,10 +2432,17 @@ static void intel_enable_ddi(struct intel_encoder *encoder,
>>>> const struct intel_crtc_state *crtc_state,
>>>> const struct drm_connector_state *conn_state)
>>>> {
>>>> + struct drm_connector *connector = conn_state->connector;
>>>> + struct intel_connector *intel_connector = to_intel_connector(connector);
>>>> +
>>>> if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
>>>> intel_enable_ddi_hdmi(encoder, crtc_state, conn_state);
>>>> else
>>>> intel_enable_ddi_dp(encoder, crtc_state, conn_state);
>>>> +
>>>> + if (conn_state->content_protection ==
>>>> + DRM_MODE_CONTENT_PROTECTION_DESIRED)
>>>> + intel_hdcp_enable(intel_connector);
>>>> }
>>>> static void intel_disable_ddi_dp(struct intel_encoder *encoder,
>>>> @@ -2468,10 +2475,17 @@ static void intel_disable_ddi(struct intel_encoder *encoder,
>>>> const struct intel_crtc_state *old_crtc_state,
>>>> const struct drm_connector_state *old_conn_state)
>>>> {
>>>> + struct drm_connector *connector = old_conn_state->connector;
>>>> + struct intel_connector *intel_connector = to_intel_connector(connector);
>>>> +
>>>> if (intel_crtc_has_type(old_crtc_state, INTEL_OUTPUT_HDMI))
>>>> intel_disable_ddi_hdmi(encoder, old_crtc_state, old_conn_state);
>>>> else
>>>> intel_disable_ddi_dp(encoder, old_crtc_state, old_conn_state);
>>>> +
>>>> + if (old_conn_state->content_protection !=
>>>> + DRM_MODE_CONTENT_PROTECTION_OFF)
>>>> + intel_hdcp_disable(intel_connector);
>>>
>>> We might want to disable the hdcp before disabling the DDI. Actually we
>>> could trigger hdcp disable at connector state change(due to hot-unplug)
>>> also.
>>
>> Yeah this part needs to be reworked a bit, also because the locking
>> doesn't work yet. I think hot-unplug is handled by the worker thread
>> already, it does the mandatory regular polling.
>> -Daniel
>>
>>> Thanks,
>>> --Ram
>>>>
>>>> }
>>>> static void bxt_ddi_pre_pll_enable(struct intel_encoder *encoder,
>>>> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
>>>> index 47d022d48718..8924004575b8 100644
>>>> --- a/drivers/gpu/drm/i915/intel_drv.h
>>>> +++ b/drivers/gpu/drm/i915/intel_drv.h
>>>> @@ -299,6 +299,49 @@ struct intel_panel {
>>>> } backlight;
>>>> };
>>>> +struct intel_hdcp_shim {
>>>> + /* Outputs the transmitter's An and Aksv values to the receiver. */
>>>> + int (*write_an_aksv)(struct intel_digital_port *intel_dig_port, u8 *an);
>>>> +
>>>> + /* Reads the receiver's key selection vector */
>>>> + int (*read_bksv)(struct intel_digital_port *intel_dig_port, u8 *bksv);
>>>> +
>>>> + /*
>>>> + * Reads BINFO from DP receivers and BSTATUS from HDMI receivers. The
>>>> + * definitions are the same in the respective specs, but the names are
>>>> + * different. Call it BSTATUS since that's the name the HDMI spec
>>>> + * uses and it was there first.
>>>> + */
>>>> + int (*read_bstatus)(struct intel_digital_port *intel_dig_port,
>>>> + u8 *bstatus);
>>>> +
>>>> + /* Determines whether a repeater is present downstream */
>>>> + int (*repeater_present)(struct intel_digital_port *intel_dig_port,
>>>> + bool *repeater_present);
>>>> +
>>>> + /* Reads the receiver's Ri' value */
>>>> + int (*read_ri_prime)(struct intel_digital_port *intel_dig_port, u8 *ri);
>>>> +
>>>> + /* Determines if the receiver's KSV FIFO is ready for consumption */
>>>> + int (*read_ksv_ready)(struct intel_digital_port *intel_dig_port,
>>>> + bool *ksv_ready);
>>>> +
>>>> + /* Reads the ksv fifo for num_downstream devices */
>>>> + int (*read_ksv_fifo)(struct intel_digital_port *intel_dig_port,
>>>> + int num_downstream, u8 *ksv_fifo);
>>>> +
>>>> + /* Reads a 32-bit part of V' from the receiver */
>>>> + int (*read_v_prime_part)(struct intel_digital_port *intel_dig_port,
>>>> + int i, u32 *part);
>>>> +
>>>> + /* Enables HDCP signalling on the port */
>>>> + int (*toggle_signalling)(struct intel_digital_port *intel_dig_port,
>>>> + bool enable);
>>>> +
>>>> + /* Ensures the link is still protected */
>>>> + bool (*check_link)(struct intel_digital_port *intel_dig_port);
>>>> +};
>>>> +
>>>> struct intel_connector {
>>>> struct drm_connector base;
>>>> /*
>>>> @@ -330,6 +373,9 @@ struct intel_connector {
>>>> /* Work struct to schedule a uevent on link train failure */
>>>> struct work_struct modeset_retry_work;
>>>> +
>>>> + const struct intel_hdcp_shim *hdcp_shim;
>>>> + struct delayed_work hdcp_work;
>>>> };
>>>> struct intel_digital_connector_state {
>>>> @@ -1295,6 +1341,8 @@ void intel_ddi_set_vc_payload_alloc(const struct intel_crtc_state *crtc_state,
>>>> bool state);
>>>> u32 bxt_signal_levels(struct intel_dp *intel_dp);
>>>> uint32_t ddi_signal_levels(struct intel_dp *intel_dp);
>>>> +int intel_ddi_enable_hdcp_signalling(struct intel_encoder *intel_encoder);
>>>> +int intel_ddi_disable_hdcp_signalling(struct intel_encoder *intel_encoder);
>>>> u8 intel_ddi_dp_voltage_max(struct intel_encoder *encoder);
>>>> unsigned int intel_fb_align_height(const struct drm_framebuffer *fb,
>>>> @@ -1746,6 +1794,11 @@ static inline void intel_backlight_device_unregister(struct intel_connector *con
>>>> }
>>>> #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
>>>> +/* intel_hdcp.c */
>>>> +int intel_hdcp_enable(struct intel_connector *connector);
>>>> +int intel_hdcp_disable(struct intel_connector *connector);
>>>> +int intel_hdcp_check_link(struct intel_connector *connector);
>>>> +void intel_hdcp_work(struct work_struct *work);
>>>> /* intel_psr.c */
>>>> void intel_psr_enable(struct intel_dp *intel_dp,
>>>> diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
>>>> new file mode 100644
>>>> index 000000000000..a2a575ed657e
>>>> --- /dev/null
>>>> +++ b/drivers/gpu/drm/i915/intel_hdcp.c
>>>> @@ -0,0 +1,636 @@
>>>> +/*
>>>> + * Copyright (C) 2017 Google, Inc.
>>>> + *
>>>> + * This software is licensed under the terms of the GNU General Public
>>>> + * License version 2, as published by the Free Software Foundation, and
>>>> + * may be copied, distributed, and modified under those terms.
>>>> + *
>>>> + * This program is distributed in the hope that it will be useful,
>>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>>>> + * GNU General Public License for more details.
>>>> + */
>>>> +
>>>> +#include <drm/drmP.h>
>>>> +#include <drm/drm_hdcp.h>
>>>> +#include <linux/i2c.h>
>>>> +#include <linux/random.h>
>>>> +
>>>> +#include "intel_drv.h"
>>>> +#include "i915_reg.h"
>>>> +
>>>> +#define KEY_LOAD_TRIES 5
>>>> +
>>>> +static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
>>>> + const struct intel_hdcp_shim *shim)
>>>> +{
>>>> + unsigned long timeout = jiffies + msecs_to_jiffies_timeout(500);
>>>> + int ret;
>>>> + bool ksv_ready;
>>>> +
>>>> + while (true) {
>>>> + ret = shim->read_ksv_ready(intel_dig_port, &ksv_ready);
>>>> + if (ret)
>>>> + return ret;
>>>> + if (ksv_ready)
>>>> + break;
>>>> + if (time_after(jiffies, timeout))
>>>> + return -ETIMEDOUT;
>>>> + msleep(100);
>>>> + }
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static void intel_hdcp_clear_keys(struct drm_i915_private *dev_priv)
>>>> +{
>>>> + I915_WRITE(SKL_HDCP_KEY_CONF, SKL_HDCP_CLEAR_KEYS_TRIGGER);
>>>> + I915_WRITE(SKL_HDCP_KEY_STATUS,
>>>> + SKL_HDCP_KEY_LOAD_DONE | SKL_HDCP_KEY_LOAD_STATUS |
>>>> + SKL_HDCP_FUSE_IN_PROGRESS | SKL_HDCP_FUSE_ERROR |
>>>> + SKL_HDCP_FUSE_DONE);
>>>> +}
>>>> +
>>>> +static int intel_hdcp_load_keys(struct drm_i915_private *dev_priv)
>>>> +{
>>>> + unsigned long timeout;
>>>> + int ret;
>>>> + u32 val;
>>>> +
>>>> + // Initiate loading the HDCP key from fuses
>>>> + mutex_lock(&dev_priv->pcu_lock);
>>>> + ret = sandybridge_pcode_write(dev_priv, SKL_PCODE_LOAD_HDCP_KEYS, 1);
>>>> + mutex_unlock(&dev_priv->pcu_lock);
>>>> + if (ret) {
>>>> + DRM_ERROR("Failed to initiate HDCP key load (%d)\n", ret);
>>>> + return ret;
>>>> + }
>>>> +
>>>> + // Wait for the keys to load (500us)
>>>> + timeout = jiffies + nsecs_to_jiffies_timeout(500 * 1000);
>>>> + while (true) {
>>>> + val = I915_READ(SKL_HDCP_KEY_STATUS);
>>>> + if (val & SKL_HDCP_KEY_LOAD_DONE)
>>>> + break;
>>>> + if (time_after(jiffies, timeout))
>>>> + return -ETIMEDOUT;
>>>> + usleep_range(50, 100);
>>>> + }
>>>> + if (!(val & SKL_HDCP_KEY_LOAD_STATUS))
>>>> + return -ENXIO;
>>>> +
>>>> + // Send Aksv over to PCH display for use in authentication
>>>> + I915_WRITE(SKL_HDCP_KEY_CONF, SKL_HDCP_AKSV_SEND_TRIGGER);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +/* Returns updated SHA-1 index */
>>>> +static int intel_write_sha_text(struct drm_i915_private *dev_priv, u32 sha_text)
>>>> +{
>>>> + I915_WRITE(SKL_HDCP_SHA_TEXT, sha_text);
>>>> + if (wait_for(I915_READ(SKL_HDCP_REP_CTL) & SKL_HDCP_SHA1_READY, 1)) {
>>>> + DRM_ERROR("Timed out waiting for SHA1 ready\n");
>>>> + return -ETIMEDOUT;
>>>> + }
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static
>>>> +u32 intel_hdcp_get_repeater_ctl(struct intel_digital_port *intel_dig_port)
>>>> +{
>>>> + enum port port = intel_dig_port->port;
>>>> + switch(port) {
>>>> + case PORT_A:
>>>> + return SKL_HDCP_DDIA_REP_PRESENT | SKL_HDCP_DDIA_SHA1_M0;
>>>> + case PORT_B:
>>>> + return SKL_HDCP_DDIB_REP_PRESENT | SKL_HDCP_DDIB_SHA1_M0;
>>>> + case PORT_C:
>>>> + return SKL_HDCP_DDIC_REP_PRESENT | SKL_HDCP_DDIC_SHA1_M0;
>>>> + case PORT_D:
>>>> + return SKL_HDCP_DDID_REP_PRESENT | SKL_HDCP_DDID_SHA1_M0;
>>>> + case PORT_E:
>>>> + return SKL_HDCP_DDIE_REP_PRESENT | SKL_HDCP_DDIE_SHA1_M0;
>>>> + default:
>>>> + break;
>>>> + }
>>>> + DRM_ERROR("Unknown port %d\n", port);
>>>> + return -EINVAL;
>>>> +}
>>>> +
>>>> +/* Implements Part 2 of the HDCP authorization procedure */
>>>> +static
>>>> +int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port,
>>>> + const struct intel_hdcp_shim *shim)
>>>> +{
>>>> + struct drm_i915_private *dev_priv;
>>>> + u32 vprime, sha_text, sha_leftovers, rep_ctl;
>>>> + u8 bstatus[2], num_downstream, *ksv_fifo;
>>>> + int ret, i, j, sha_idx;
>>>> +
>>>> + dev_priv = intel_dig_port->base.base.dev->dev_private;
>>>> +
>>>> + ret = shim->read_bstatus(intel_dig_port, bstatus);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + /* If there are no downstream devices, we're all done. */
>>>> + num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]);
>>>> + if (num_downstream == 0) {
>>>> + DRM_INFO("HDCP is enabled (no downstream devices)\n");
>>>> + return 0;
>>>> + }
>>>> +
>>>> + // Poll for ksv list ready (spec says max time allowed is 5s)
>>>> + ret = intel_hdcp_poll_ksv_fifo(intel_dig_port, shim);
>>>> + if (ret) {
>>>> + DRM_ERROR("KSV list failed to become ready (%d)\n", ret);
>>>> + return ret;
>>>> + }
>>>> +
>>>> + ksv_fifo = kzalloc(num_downstream * DRM_HDCP_KSV_LEN, GFP_KERNEL);
>>>> + if (!ksv_fifo)
>>>> + return -ENOMEM;
>>>> +
>>>> + ret = shim->read_ksv_fifo(intel_dig_port, num_downstream, ksv_fifo);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + // Process V' values from the receiver
>>>> + for (i = 0; i < DRM_HDCP_V_PRIME_NUM_PARTS; i++) {
>>>> + ret = shim->read_v_prime_part(intel_dig_port, i, &vprime);
>>>> + if (ret)
>>>> + return ret;
>>>> + I915_WRITE(SKL_HDCP_SHA_V_PRIME(i), vprime);
>>>> + }
>>>> +
>>>> + /*
>>>> + * We need to write the concatenation of all device KSVs, BINFO (DP) ||
>>>> + * BSTATUS (HDMI), and M0 (which is added via HDCP_REP_CTL). This byte
>>>> + * stream is written via the HDCP_SHA_TEXT register in 32-bit
>>>> + * increments. Every 64 bytes, we need to write HDCP_REP_CTL again. This
>>>> + * index will keep track of our progress through the 64 bytes as well as
>>>> + * helping us work the 40-bit KSVs through our 32-bit register.
>>>> + *
>>>> + * NOTE: data passed via HDCP_SHA_TEXT should be big-endian
>>>> + */
>>>> + sha_idx = 0;
>>>> + sha_text = 0;
>>>> + sha_leftovers = 0;
>>>> + rep_ctl = intel_hdcp_get_repeater_ctl(intel_dig_port);
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32);
>>>> + for (i = 0; i < num_downstream; i++) {
>>>> + unsigned sha_empty;
>>>> + u8 *ksv = &ksv_fifo[i * DRM_HDCP_KSV_LEN];
>>>> +
>>>> + // Fill up the empty slots in sha_text and write it out
>>>> + sha_empty = sizeof(sha_text) - sha_leftovers;
>>>> + for (j = 0; j < sha_empty; j++)
>>>> + sha_text |= ksv[j] << ((sizeof(sha_text) - j - 1) * 8);
>>>> +
>>>> + ret = intel_write_sha_text(dev_priv, sha_text);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> +
>>>> + // Programming guide writes this every 64 bytes
>>>> + sha_idx += sizeof(sha_text);
>>>> + if (!(sha_idx % 64))
>>>> + I915_WRITE(SKL_HDCP_REP_CTL,
>>>> + rep_ctl | SKL_HDCP_SHA1_TEXT_32);
>>>> +
>>>> + // Store the leftover bytes from the ksv in sha_text
>>>> + sha_leftovers = DRM_HDCP_KSV_LEN - sha_empty;
>>>> + sha_text = 0;
>>>> + for (j = 0; j < sha_leftovers; j++)
>>>> + sha_text |= ksv[sha_empty + j] <<
>>>> + ((sizeof(sha_text) - j - 1) * 8);
>>>> +
>>>> + /*
>>>> + * If we still have room in sha_text for more data, continue.
>>>> + * Otherwise, write it out immediately.
>>>> + */
>>>> + if (sizeof(sha_text) > sha_leftovers)
>>>> + continue;
>>>> +
>>>> + ret = intel_write_sha_text(dev_priv, sha_text);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_leftovers = 0;
>>>> + sha_text = 0;
>>>> + sha_idx += sizeof(sha_text);
>>>> + }
>>>> +
>>>> + /*
>>>> + * We need to write BINFO/BSTATUS, and M0 now. Depending on how many
>>>> + * bytes are leftover from the last ksv, we might be able to fit them
>>>> + * all in sha_text (first 2 cases), or we might need to split them up
>>>> + * into 2 writes (last 2 cases).
>>>> + */
>>>> + if (sha_leftovers == 0) {
>>>> + // Write 16 bits of text, 16 bits of M0
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_16);
>>>> + ret = intel_write_sha_text(dev_priv,
>>>> + bstatus[0] << 8 | bstatus[1]);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> +
>>>> + // Write 32 bits of M0
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0);
>>>> + ret = intel_write_sha_text(dev_priv, 0);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> +
>>>> + // Write 16 bits of M0
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_16);
>>>> + ret = intel_write_sha_text(dev_priv, 0);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> +
>>>> + } else if (sha_leftovers == 1) {
>>>> + // Write 24 bits of text, 8 bits of M0
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_24);
>>>> + sha_text |= bstatus[0] << 16 | bstatus[1] << 8;
>>>> + // Only 24-bits of data, must be in the LSB
>>>> + sha_text = (sha_text & 0xffffff00) >> 8;
>>>> + ret = intel_write_sha_text(dev_priv, sha_text);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> +
>>>> + // Write 32 bits of M0
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0);
>>>> + ret = intel_write_sha_text(dev_priv, 0);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> +
>>>> + // Write 24 bits of M0
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_8);
>>>> + ret = intel_write_sha_text(dev_priv, 0);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> +
>>>> + } else if (sha_leftovers == 2) {
>>>> + // Write 32 bits of text
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32);
>>>> + sha_text |= bstatus[0] << 24 | bstatus[1] << 16;
>>>> + ret = intel_write_sha_text(dev_priv, sha_text);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> +
>>>> + // Write 64 bits of M0
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0);
>>>> + for (i = 0; i < 2; i++) {
>>>> + ret = intel_write_sha_text(dev_priv, 0);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> + }
>>>> + } else if (sha_leftovers == 3) {
>>>> + // Write 32 bits of text
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32);
>>>> + sha_text |= bstatus[0] << 24;
>>>> + ret = intel_write_sha_text(dev_priv, sha_text);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> +
>>>> + // Write 8 bits of text, 24 bits of M0
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_8);
>>>> + ret = intel_write_sha_text(dev_priv, bstatus[1]);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> +
>>>> + // Write 32 bits of M0
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0);
>>>> + ret = intel_write_sha_text(dev_priv, 0);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> +
>>>> + // Write 8 bits of M0
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_24);
>>>> + ret = intel_write_sha_text(dev_priv, 0);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> + } else {
>>>> + DRM_ERROR("Invalid number of leftovers %d\n", sha_leftovers);
>>>> + return -EINVAL;
>>>> + }
>>>> +
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32);
>>>> + // Fill up to 64 - 4 bytes with zeros (leave the last write for length)
>>>> + while ((sha_idx % 64) < (64 - sizeof(sha_text))) {
>>>> + ret = intel_write_sha_text(dev_priv, 0);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + sha_idx += sizeof(sha_text);
>>>> + }
>>>> +
>>>> + /*
>>>> + * Last write gets the length of the concatenation in bits. That is:
>>>> + * - 5 bytes per device
>>>> + * - 10 bytes for BINFO/BSTATUS(2), M0(8)
>>>> + */
>>>> + sha_text = (num_downstream * 5 + 10) * 8;
>>>> + ret = intel_write_sha_text(dev_priv, sha_text);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> +
>>>> + // Finally, tell the HW we're done with the hash and wait for it to ACK
>>>> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_COMPLETE_HASH);
>>>> + if (wait_for(I915_READ(SKL_HDCP_REP_CTL) & SKL_HDCP_SHA1_COMPLETE, 1)) {
>>>> + DRM_ERROR("Timed out waiting for SHA1 complete\n");
>>>> + return -ETIMEDOUT;
>>>> + }
>>>> + if (!(I915_READ(SKL_HDCP_REP_CTL) & SKL_HDCP_SHA1_V_MATCH)) {
>>>> + DRM_ERROR("SHA-1 mismatch, HDCP failed\n");
>>>> + return -ENXIO;
>>>> + }
>>>> +
>>>> + DRM_INFO("HDCP is enabled (%d downstream devices)\n", num_downstream);
>>>> + return 0;
>>>> +}
>>>> +
>>>> +/* Implements Part 1 of the HDCP authorization procedure */
>>>> +static int intel_hdcp_auth(struct intel_digital_port *intel_dig_port,
>>>> + const struct intel_hdcp_shim *shim)
>>>> +{
>>>> + struct drm_i915_private *dev_priv;
>>>> + enum port port;
>>>> + unsigned long r0_prime_gen_start;
>>>> + int ret, i;
>>>> + union {
>>>> + u32 reg[2];
>>>> + u8 shim[DRM_HDCP_AN_LEN];
>>>> + } an;
>>>> + union {
>>>> + u32 reg[2];
>>>> + u8 shim[DRM_HDCP_KSV_LEN];
>>>> + } bksv;
>>>> + union {
>>>> + u32 reg;
>>>> + u8 shim[DRM_HDCP_RI_LEN];
>>>> + } ri;
>>>> + bool repeater_present;
>>>> +
>>>> + dev_priv = intel_dig_port->base.base.dev->dev_private;
>>>> +
>>>> + port = intel_dig_port->port;
>>>> +
>>>> + // Initialize An with 2 random values and acquire it
>>>> + for (i = 0; i < 2; i++)
>>>> + I915_WRITE(SKL_PORT_HDCP_ANINIT(port), get_random_long());
>>>> + I915_WRITE(SKL_PORT_HDCP_CONF(port), SKL_HDCP_CONF_CAPTURE_AN);
>>>> +
>>>> + // Wait for An to be acquired
>>>> + if (wait_for(I915_READ(SKL_PORT_HDCP_STATUS(port)) &
>>>> + SKL_HDCP_STATUS_AN_READY, 1)) {
>>>> + DRM_ERROR("Timed out waiting for An\n");
>>>> + return -ETIMEDOUT;
>>>> + }
>>>> +
>>>> + an.reg[0] = I915_READ(SKL_PORT_HDCP_ANLO(port));
>>>> + an.reg[1] = I915_READ(SKL_PORT_HDCP_ANHI(port));
>>>> + ret = shim->write_an_aksv(intel_dig_port, an.shim);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + r0_prime_gen_start = jiffies;
>>>> +
>>>> + memset(&bksv, 0, sizeof(bksv));
>>>> + ret = shim->read_bksv(intel_dig_port, bksv.shim);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + I915_WRITE(SKL_PORT_HDCP_BKSVLO(port), bksv.reg[0]);
>>>> + I915_WRITE(SKL_PORT_HDCP_BKSVHI(port), bksv.reg[1]);
>>>> +
>>>> + ret = shim->repeater_present(intel_dig_port, &repeater_present);
>>>> + if (ret)
>>>> + return ret;
>>>> + if (repeater_present)
>>>> + I915_WRITE(SKL_HDCP_REP_CTL,
>>>> + intel_hdcp_get_repeater_ctl(intel_dig_port));
>>>> +
>>>> + ret = shim->toggle_signalling(intel_dig_port, true);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + I915_WRITE(SKL_PORT_HDCP_CONF(port), SKL_HDCP_CONF_AUTH_AND_ENC);
>>>> +
>>>> + // Wait for R0 ready
>>>> + if (wait_for(I915_READ(SKL_PORT_HDCP_STATUS(port)) &
>>>> + (SKL_HDCP_STATUS_R0_READY | SKL_HDCP_STATUS_ENC), 1)) {
>>>> + DRM_ERROR("Timed out waiting for R0 ready\n");
>>>> + return -ETIMEDOUT;
>>>> + }
>>>> +
>>>> + /*
>>>> + * Wait for R0' to become available, the spec says 100ms from Aksv
>>>> + * write. On DP, there's an R0_READY bit available but no such bit
>>>> + * exists on HDMI. Since the upper-bound is the same, we'll just do
>>>> + * the stupid thing instead of polling on one and not the other.
>>>> + */
>>>> + wait_remaining_ms_from_jiffies(r0_prime_gen_start, 100);
>>>> +
>>>> + ri.reg = 0;
>>>> + ret = shim->read_ri_prime(intel_dig_port, ri.shim);
>>>> + if (ret)
>>>> + return ret;
>>>> + I915_WRITE(SKL_PORT_HDCP_RPRIME(port), ri.reg);
>>>> +
>>>> + // Wait for Ri prime match
>>>> + if (wait_for(I915_READ(SKL_PORT_HDCP_STATUS(port)) &
>>>> + (SKL_HDCP_STATUS_RI_MATCH | SKL_HDCP_STATUS_ENC), 1)) {
>>>> + DRM_ERROR("Timed out waiting for Ri prime match (%x)\n",
>>>> + I915_READ(SKL_PORT_HDCP_STATUS(port)));
>>>> + return -ETIMEDOUT;
>>>> + }
>>>> +
>>>> + // Wait for encryption confirmation
>>>> + if (wait_for(I915_READ(SKL_PORT_HDCP_STATUS(port)) &
>>>> + SKL_HDCP_STATUS_ENC, 20)) {
>>>> + DRM_ERROR("Timed out waiting for encryption\n");
>>>> + return -ETIMEDOUT;
>>>> + }
>>>> +
>>>> + /*
>>>> + * XXX: If we have MST-connected devices, we need to enable encryption
>>>> + * on those as well.
>>>> + */
>>>> +
>>>> + return intel_hdcp_auth_downstream(intel_dig_port, shim);
>>>> +}
>>>> +
>>>> +static
>>>> +struct intel_digital_port *conn_to_dig_port(struct intel_connector *connector)
>>>> +{
>>>> + return enc_to_dig_port(&intel_attached_encoder(&connector->base)->base);
>>>> +}
>>>> +
>>>> +static int _intel_hdcp_disable(struct intel_connector *connector)
>>>> +{
>>>> + struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
>>>> + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
>>>> + enum port port = intel_dig_port->port;
>>>> + int ret;
>>>> +
>>>> + I915_WRITE(SKL_PORT_HDCP_CONF(port), 0);
>>>> + if (wait_for(I915_READ(SKL_PORT_HDCP_STATUS(port)) == 0, 20)) {
>>>> + DRM_ERROR("Failed to disable HDCP, timeout clearing status\n");
>>>> + return -ETIMEDOUT;
>>>> + }
>>>> +
>>>> + intel_hdcp_clear_keys(dev_priv);
>>>> +
>>>> + ret = connector->hdcp_shim->toggle_signalling(intel_dig_port, false);
>>>> + if (ret) {
>>>> + DRM_ERROR("Failed to disable HDCP signalling\n");
>>>> + return ret;
>>>> + }
>>>> +
>>>> + DRM_INFO("HDCP is disabled\n");
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static int _intel_hdcp_enable(struct intel_connector *connector)
>>>> +{
>>>> + struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
>>>> + int i, ret;
>>>> +
>>>> + if (!(I915_READ(SKL_FUSE_STATUS) & SKL_FUSE_PG_DIST_STATUS(1))) {
>>>> + DRM_ERROR("PG1 is disabled, cannot load keys\n");
>>>> + return -ENXIO;
>>>> + }
>>>> +
>>>> + for (i = 0; i < KEY_LOAD_TRIES; i++) {
>>>> + ret = intel_hdcp_load_keys(dev_priv);
>>>> + if (!ret)
>>>> + break;
>>>> + intel_hdcp_clear_keys(dev_priv);
>>>> + }
>>>> + if (ret) {
>>>> + DRM_ERROR("Could not load HDCP keys, (%d)\n", ret);
>>>> + return ret;
>>>> + }
>>>> +
>>>> + ret = intel_hdcp_auth(conn_to_dig_port(connector),
>>>> + connector->hdcp_shim);
>>>> + if (ret) {
>>>> + DRM_ERROR("Failed to authenticate HDCP (%d)\n", ret);
>>>> + return ret;
>>>> + }
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +void intel_hdcp_work(struct work_struct *work)
>>>> +{
>>>> + struct intel_connector *connector = container_of(to_delayed_work(work),
>>>> + struct intel_connector,
>>>> + hdcp_work);
>>>> + struct drm_device *dev = connector->base.dev;
>>>> + int ret;
>>>> +
>>>> + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
>>>> +
>>>> + ret = intel_hdcp_check_link(connector);
>>>> + if (!ret)
>>>> + schedule_delayed_work(&connector->hdcp_work,
>>>> + DRM_HDCP_CHECK_PERIOD_MS);
>>>> +
>>>> + drm_modeset_unlock(&dev->mode_config.connection_mutex);
>>>> +}
>>>> +
>>>> +int intel_hdcp_enable(struct intel_connector *connector)
>>>> +{
>>>> + struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
>>>> + struct drm_device *dev = &dev_priv->drm;
>>>> + struct drm_connector_state *state = connector->base.state;
>>>> + int ret;
>>>> +
>>>> + WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
>>>> +
>>>> + if (!connector->hdcp_shim)
>>>> + return -ENOENT;
>>>> +
>>>> + ret = _intel_hdcp_enable(connector);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + state->content_protection = DRM_MODE_CONTENT_PROTECTION_ENABLED;
>>>> +
>>>> + schedule_delayed_work(&connector->hdcp_work, DRM_HDCP_CHECK_PERIOD_MS);
>>>> + return 0;
>>>> +}
>>>> +
>>>> +int intel_hdcp_disable(struct intel_connector *connector)
>>>> +{
>>>> + struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
>>>> + struct drm_device *dev = &dev_priv->drm;
>>>> +
>>>> + WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
>>>> +
>>>> + if (!connector->hdcp_shim)
>>>> + return -ENOENT;
>>>> +
>>>> + cancel_delayed_work(&connector->hdcp_work);
>>>> +
>>>> + return _intel_hdcp_disable(connector);
>>>> +}
>>>> +
>>>> +/* Implements Part 3 of the HDCP authorization procedure */
>>>> +int intel_hdcp_check_link(struct intel_connector *connector)
>>>> +{
>>>> + struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
>>>> + struct drm_device *dev = &dev_priv->drm;
>>>> + struct drm_connector_state *state = connector->base.state;
>>>> + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
>>>> + enum port port = intel_dig_port->port;
>>>> + int ret;
>>>> +
>>>> + WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
>>>> +
>>>> + if (state->content_protection != DRM_MODE_CONTENT_PROTECTION_ENABLED)
>>>> + return 0;
>>>> +
>>>> + if (!connector->hdcp_shim)
>>>> + return -ENOENT;
>>>> +
>>>> + if (!(I915_READ(SKL_PORT_HDCP_STATUS(port)) & SKL_HDCP_STATUS_ENC)) {
>>>> + DRM_ERROR("HDCP check failed: link is not encrypted, %x\n",
>>>> + I915_READ(SKL_PORT_HDCP_STATUS(port)));
>>>> + ret = -ENXIO;
>>>> + goto fail;
>>>> + }
>>>> +
>>>> + if (connector->hdcp_shim->check_link(intel_dig_port))
>>>> + return 0;
>>>> +
>>>> + DRM_INFO("HDCP link failed, retrying authentication\n");
>>>> +
>>>> + ret = _intel_hdcp_disable(connector);
>>>> + if (ret) {
>>>> + DRM_ERROR("Failed to disable hdcp (%d)\n", ret);
>>>> + goto fail;
>>>> + }
>>>> +
>>>> + ret = _intel_hdcp_enable(connector);
>>>> + if (ret) {
>>>> + DRM_ERROR("Failed to enable hdcp (%d)\n", ret);
>>>> + goto fail;
>>>> + }
>>>> +
>>>> + return 0;
>>>> +
>>>> +fail:
>>>> + state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED;
>>>> + return ret;
>>>> +}
>>>
>>> _______________________________________________
>>> Intel-gfx mailing list
>>> Intel-gfx@lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
>