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

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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) {