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drm/i915: Skip vblank waits for cursor updates when watermarks dont need updating 

In legacy cursor updates we need the extra vblank waits if we update
watermarks, and then we cannot skip the vblank for cursors.

This is why for < gen9 we disabled the cursor fastpath, but we can skip
the wait when post vblank watermarks are untouched.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170919121419.13708-2-maarten.lankhorst@linux.intel.com
This commit is contained in:
Maarten Lankhorst 2017-09-19 14:14:19 +02:00
parent 3cf50c63a7
commit 213f1bd035
1 changed files with 10 additions and 2 deletions
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12
drivers/gpu/drm/i915/intel_display.c
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@ -12562,8 +12562,16 @@ static int intel_atomic_commit(struct drm_device *dev,
* FIXME doing watermarks and fb cleanup from a vblank worker
* (assuming we had any) would solve these problems.
*/
if (INTEL_GEN(dev_priv) < 9)
state->legacy_cursor_update = false;
if (INTEL_GEN(dev_priv) < 9 && state->legacy_cursor_update) {
struct intel_crtc_state *new_crtc_state;
struct intel_crtc *crtc;
int i;
for_each_new_intel_crtc_in_state(intel_state, crtc, new_crtc_state, i)
if (new_crtc_state->wm.need_postvbl_update ||
new_crtc_state->update_wm_post)
state->legacy_cursor_update = false;
}
ret = intel_atomic_prepare_commit(dev, state);
if (ret) {