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drm/i915: Skip useless watermark/FIFO related work on VLV/CHV when not needed

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Check whether anything relevant has actually change when we compute new
watermarks for each plane in the state. If the watermarks for no
primary/sprite planes changed we don't have to recompute the FIFO split
or reprogram the DSBARB registers. And even the cursor watermarks didn't
change we can skip the merge+invert step between all the planes on
the pipe as well.

v2: s/noninverted/raw/ for consistency with other platforms
v3: Drop duplicated vlv_get_fifo_size() call during init

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170302171508.1666-9-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä
2017-03-02 19:14:58 +02:00
parent ff32c54ef1
commit 236c48e692
3 changed files with 58 additions and 15 deletions
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1
drivers/gpu/drm/i915/intel_drv.h
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@@ -573,6 +573,7 @@ struct intel_crtc_state {
bool disable_cxsr;
bool update_wm_pre, update_wm_post; /* watermarks are updated */
bool fb_changed; /* fb on any of the planes is changed */
bool fifo_changed; /* FIFO split is changed */
/* Pipe source size (ie. panel fitter input size)
* All planes will be positioned inside this space,