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drm/sti: do not post GDP command if no update 

Do not process update requests with unmodified parameters.

This typically happens when the driver is called with legacy
(non-atomic) IOCTL : in that case atomic_update() is called multiple
times with the same parameters.

Signed-off-by: Vincent Abriou <vincent.abriou@st.com>
This commit is contained in:
Vincent Abriou 2017-02-02 09:50:48 +01:00
parent c5649ee497
commit e9f494d36f
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/sti/sti_gdp.c
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@ -708,6 +708,21 @@ static void sti_gdp_atomic_update(struct drm_plane *drm_plane,
if (!crtc || !fb)
return;
if ((oldstate->fb == state->fb) &&
(oldstate->crtc_x == state->crtc_x) &&
(oldstate->crtc_y == state->crtc_y) &&
(oldstate->crtc_w == state->crtc_w) &&
(oldstate->crtc_h == state->crtc_h) &&
(oldstate->src_x == state->src_x) &&
(oldstate->src_y == state->src_y) &&
(oldstate->src_w == state->src_w) &&
(oldstate->src_h == state->src_h)) {
/* No change since last update, do not post cmd */
DRM_DEBUG_DRIVER("No change, not posting cmd\n");
plane->status = STI_PLANE_UPDATED;
return;
}
if (!gdp->vtg) {
struct sti_compositor *compo = dev_get_drvdata(gdp->dev);
struct sti_mixer *mixer = to_sti_mixer(crtc);