[PATCH xf86-video-amdgpu] Set drmmode_crtc->scanout_id = 0 when TearFree is disabled

[Michel Dänzer]

From: Michel Dänzer <michel.daenzer at amd.com>

When disabling TearFree, drmmode_crtc->scanout_id could remain as 1,
but drmmode_set_mode_major would destroy drmmode_crtc->scanout[1], so
scanout_do_update() would keep bailing, and the scanout buffer would
stop being updated.

Fixes freeze after disabling TearFree on a CRTC with active RandR
rotation or other transform.

Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
 src/drmmode_display.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 536890d18..793027d50 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -846,6 +846,8 @@ drmmode_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 		drmmode_crtc_update_tear_free(crtc);
 		if (drmmode_crtc->tear_free)
 			scanout_id = drmmode_crtc->scanout_id;
+		else
+			drmmode_crtc->scanout_id = 0;
 
 		/* gamma is disabled in kernel driver for deep color */
 		if (pScrn->depth != 30)
-- 
2.17.0