kernel/drivers/gpu/drm/i915/intel_hdcp.c, branch linux-4.17.y

drm/i915: Reauthenticate HDCP on failure

2018-02-05T17:59:23Z

Incase of HDCP authentication failure, HDCP spec expects reauthentication. Hence this patch adds the reauthentications to be compliance with spec. v2: do-while to for loop for simplicity. [Seanpaul] v3: positioning the logs effectively. [Seanpaul] Signed-off-by: Ramalingam C Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/1517609350-10698-8-git-send-email-ramalingam.c@intel.com

drm/i915: Detect panel's hdcp capability

2018-02-05T17:59:18Z

DP HDCP1.4 spec mandates that An can be written to panel only after detecting the panel's hdcp capability. For DP 0th Bit of Bcaps register indicates the panel's hdcp capability For HDMI valid BKSV indicates the panel's hdcp capability. For HDMI it is optional to detect the panel's hdcp capability before An Write. v2: Added comments explaining the need for action [Seanpaul]. Made panel's hdcp capability detection optional for hdmi [Seanpaul]. Defined a func for reading bcaps for DP [Seanpaul]. v3: Removed the NULL initialization [Seanpaul]. Signed-off-by: Ramalingam C Reviewed-by: Sean Paul Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/1517609350-10698-7-git-send-email-ramalingam.c@intel.com

drm/i915: Optimize HDCP key load

2018-02-05T17:59:14Z

HDCP key need not be cleared on each hdcp disable. And HDCP key Load is skipped if key is already loaded. v2: No change. Added Reviewed-by tag. v3: No change. Signed-off-by: Ramalingam C Reviewed-by: Sean Paul Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/1517609350-10698-6-git-send-email-ramalingam.c@intel.com

drm/i915: Retry HDCP bksv read

2018-02-05T17:59:07Z

HDCP specification says that when bksv is identified as invalid (not with 20 1s), bksv should be re-read and verified. This patch adds the above mentioned re-read for bksv. v2: Rephrased the commit msg [Seanpaul] v3: do-while to for-loop [Seanpaul] v4: retry only if bksv is invalid and no error msg on each attempt [Seanpaul] v5: Correcting the return value [Seanpaul]. Signed-off-by: Ramalingam C Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/1517851922-30547-1-git-send-email-ramalingam.c@intel.com

drm/i915: Connector info in HDCP debug msgs

2018-02-05T17:58:59Z

When HDCP authentication is triggered on multiple connector, having connector name and ID in debug message will be more informative. v2: Added logs with connector info at the start of en/disable [Seanpaul] Added the connector info into Check link failure msgs too. v3: No Changes. Added Reviewed-by tag. Signed-off-by: Ramalingam C Reviewed-by: Sean Paul Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/1517609350-10698-4-git-send-email-ramalingam.c@intel.com

drm/i915: Stop encryption for repeater with no sink

2018-02-05T17:58:53Z

If a HDCP repeater is detected with zero downstream devices, HDCP spec approves either of below actions: 1. Dont continue on second stage authentication. Disable encryption. 2. Continue with second stage authentication excluding the KSV list and on success, continue encryption. Since disable encryption is agreed, repeater is not expected to have its own display. So there is no consumption of the display content in such setup. Hence, incase of repeater with zero device count, this patch fails the HDCP authentication and stops the HDCP encryption. v2: Rephrased commit msg and added comments in code [Seanpaul] v3: No changes. Added Reviewed-by tag. Signed-off-by: Ramalingam C Reviewed-by: Sean Paul Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/1517609350-10698-3-git-send-email-ramalingam.c@intel.com

drm/i915: Handle failure from 2nd stage HDCP auth

2018-02-05T17:58:45Z

We enable the HDCP encryption as a part of first stage authentication. So when second stage authentication fails, we need to disable the HDCP encryption and signalling. This patch ensures that, when hdcp authentication fails, HDCP encryption and signalling is turned off. v2: Dropped connector ref passing to auth [Seanpaul] Moved the call to disable_hdcp() to enable_hdcp() [Seanpaul] v3: No Changes. Added the Reveiwed-by tag. Signed-off-by: Ramalingam C Reviewed-by: Sean Paul Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/1517609350-10698-2-git-send-email-ramalingam.c@intel.com

drm/i915: Downgrade hdcp logs from INFO to DEBUG_KMS

2018-01-30T15:55:22Z

HDCP was a bit too chatty to get along with the rest of the i915 driver. Suggested-by: Daniel Vetter Reviewed-by: Daniel Vetter Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/20180130144707.171657-1-seanpaul@chromium.org

drm/i915: Restore HDCP DRM_INFO when with no downstream

2018-01-30T15:54:51Z

The commit below returned earlier than before, but failed to move the info message when authenticating without downstream devices. This patch restores the message on authentication success. Changes in v2: - s/no downstream devices/no repeater present/ (Ram) Fixes: 87eb3ec818fa ("drm/i915: II stage HDCP auth for repeater only") Cc: Ramalingam C Cc: Sean Paul Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: intel-gfx@lists.freedesktop.org Reviewed-by: Daniel Vetter Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/20180130142943.168314-1-seanpaul@chromium.org Link: https://patchwork.freedesktop.org/patch/msgid/20180130142943.168314-1-seanpaul@chromium.org

drm/i915: Check for downstream topology errors

2018-01-18T22:56:02Z

HDCP compliant Repeaters can support max of 127 devices and max depth of 7 for downstream topology. If these max limits are exceeded, repeater will set the topology error flags MAX_CASCADE_EXCEEDED and/or MAX_DEVS_EXCEEDED in Bstatus followed by asserting READY/CP_IRQ for HDCP transmitter. This patch check for these error flags as soon as READY bit is asserted. Signed-off-by: Ramalingam C [seanpaul fixed checkpatch alignment issue] Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/1516254488-4971-5-git-send-email-ramalingam.c@intel.com