msm: mdss: dp: add support to read per frame CRC values

Display Port (DP) controller has the ability to calculate CRC values
for every frame. In addition, most DP sinks also have the capability
to calculate per frame CRC values. Add support to enable/disable
calculation of per-frame CRC values for both the DP controller and
the DP sink. Add support to read the computed CRC values via a new
sysfs node. See below for usage instructions:

To enable/disable per frame CRC calculation:
   * echo "ctl_cr_en=[0/1]" > /sys/class/graphics/<fbi>/frame_crc
   * echo "sink_cr_en=[0/1]" > /sys/class/graphics/<fbi>/frame_crc

To read computed CRC values:
   * cat /sys/class/graphics/<fbi>/frame_crc

CRs-Fixed: 1109812
Change-Id: I41271db64463b26cbbd9baba43d098bc30da33bf
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>

0 files changed, 0 insertions, 0 deletions