Commit 2d1980b2 authored Mar 27, 2020 by Raviteja Tamatam Committed by Gerrit - the friendly Code Review server Apr 20, 2020

disp: msm: sde: avoid drm_crtc_vblank_on during seamless transition

When there is a race condition between DMS seamless transition and
drm_wait_vblank_ioctl, the latter gets deregistered for vblank
handle as drm_crtc_vblank_on call in crtc enbale increments vblank
count. This change avoids drm_crtc_vblank_on call during seamless
transition when crtc is already enabled as it is not required.

Change-Id: I0b9327a98cef00405b5b94e24a3fd15205339cfc
Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org>

parent a1143d12

msm/sde/sde_crtc.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -4103,6 +4103,11 @@ static void sde_crtc_enable(struct drm_crtc *crtc,
		SDE_EVT32_VERBOSE(DRMID(crtc));
		sde_crtc = to_sde_crtc(crtc);

		/*
		* Avoid drm_crtc_vblank_on during seamless DMS case
		* when CRTC is already in enabled state
		*/
		if (!sde_crtc->enabled)
		drm_crtc_vblank_on(crtc);

		mutex_lock(&sde_crtc->crtc_lock);