6daf1c58e7
SDE driver triggers the frame and waits for the ctl_start interrupt for command mode display. This interrupt provides confirmation that hardware has picked up the frame. Retire fence signaling is associated with this interrupt and it is sent at the rd_ptr interrupt after ctl_start. Due to lut dma delay, ctl_start interrupt may be trigger before rd_ptr or after rd_ptr. SW manages this complexity and handle retire fence for different cases with 500us threshold logic. This change replaces the ctl_start interrupt with wr_ptr interrupt by programming it to trigger at 1st write line count. This is guaranteed to come every time and it is close to rd_ptr interrupt. That allows retire fence trigger at wr_ptr interrupt and simplifies the SW logic. CRTC commit thread would be held slightly longer with this change as the wr_ptr is always close to rd_ptr and after ctl_start. Change-Id: Ic47a8f82c854b4aded0d70c95af853b28a68ffd6 Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>