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drm/i915: Detect panel's hdcp capability

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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 <ramalingam.c@intel.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1517609350-10698-7-git-send-email-ramalingam.c@intel.com
This commit is contained in:
Ramalingam C
2018-02-03 03:39:08 +05:30
committed by Sean Paul
parent 7ee5798829
commit 791a98dd9b
3 changed files with 58 additions and 7 deletions
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4
drivers/gpu/drm/i915/intel_drv.h
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@@ -369,6 +369,10 @@ struct intel_hdcp_shim {
/* Ensures the link is still protected */
bool (*check_link)(struct intel_digital_port *intel_dig_port);
/* Detects panel's hdcp capability. This is optional for HDMI. */
int (*hdcp_capable)(struct intel_digital_port *intel_dig_port,
bool *hdcp_capable);
};
struct intel_connector {