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3 Commits

Author SHA1 Message Date
Ramalingam C
b8e47d87be drm: Fix HDCP downstream dev count read 
In both HDMI and DP, device count is represented by 6:0 bits of a
register(BInfo/Bstatus)

So macro for bitmasking the device_count is fixed(0x3F->0x7F).

v3:
  Retained the Rb-ed.
v4:
  %s/drm\/i915/drm [rodrigo]
v5:
  Added "Fixes:" and HDCP keyword in subject [Rodrigo, Sean Paul]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Fixes: 495eb7f877 drm: Add some HDCP related #defines
cc: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1522929802-22850-1-git-send-email-ramalingam.c@intel.com
 2018-04-16 12:10:48 -04:00
Ramalingam C
49d85d0342 drm/i915: Check for downstream topology errors 
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 <ramalingam.c@intel.com>
[seanpaul fixed checkpatch alignment issue]
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1516254488-4971-5-git-send-email-ramalingam.c@intel.com
 2018-01-18 17:56:02 -05:00
Sean Paul
495eb7f877 drm: Add some HDCP related #defines 
In preparation for implementing HDCP in i915, add some HDCP related
register offsets and defines. The dpcd register offsets will go in
drm_dp_helper.h whereas the ddc offsets along with generic HDCP stuff
will get stuffed in drm_hdcp.h, which is new.

Changes in v2:
- drm_hdcp.h gets MIT license (Daniel)
Changes in v3:
- None
Changes in v4:
- None
Changes in v5:
- None
Changes in v6:
- SPDX license

Cc: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Ramalingam C <ramalingm.c@intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180108195545.218615-5-seanpaul@chromium.org
 2018-01-08 14:57:54 -05:00