dri2: Re-use previous CRTC when possible if pick_best_crtc returns NULL

This way, the MSC will continue ticking at the rate of (the last mode
which was enabled for) that CRTC, instead of the client running
unthrottled.

(Ported from amdgpu commit 3109f088fdbd89c2ee8078625d4f073852492656)
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michel Dänzer
2019-06-14 11:21:40 +02:00
committed by Michel Dänzer
parent d5f5bc5846
commit 2a3f2d2089

View File

@@ -517,10 +517,12 @@ xf86CrtcPtr radeon_dri2_drawable_crtc(DrawablePtr pDraw, Bool consider_disabled)
pDraw->x, pDraw->x + pDraw->width,
pDraw->y, pDraw->y + pDraw->height);
if (crtc && pDraw->type == DRAWABLE_WINDOW) {
if (pDraw->type == DRAWABLE_WINDOW) {
struct dri2_window_priv *priv = get_dri2_window_priv((WindowPtr)pDraw);
if (priv->crtc && priv->crtc != crtc) {
if (!crtc) {
crtc = priv->crtc;
} else if (priv->crtc && priv->crtc != crtc) {
CARD64 ust, mscold, mscnew;
if (radeon_dri2_get_crtc_msc(priv->crtc, &ust, &mscold) &&