From: Ville Syrjälä <ville.syrj...@linux.intel.com>
Make glk_load_luts() a bit lighter for the common case
where neither the degamma LUT nor pipe CSC are enabled
by not loading the linear degamma LUT. Making .load_luts()
as lightweight as possible is a good idea since it may need
to execute from a vblank worker under tight deadlines.
My earlier reasoning for always loading the linear degamma LUT
was to avoid an extra LUT load when just enabling/disabling the
pipe CSC, but that is nonsense since we load the LUTs on every
flagged color management change/modeset anyway (either of which
is needed for a pipe CSC toggle).
We can also get rid of the glk_can_preload_luts() special
case since the presence of the degamma LUT will now always
match csc_enable.
v2: Fix typos (Uma)
Reviewed-by: Uma Shankar <uma.shan...@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_color.c | 26 +++-------------------
1 file changed, 3 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_color.c
b/drivers/gpu/drm/i915/display/intel_color.c
index 66d9eef92c45..4bb113c39f4b 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -1198,24 +1198,6 @@ static bool chv_can_preload_luts(const struct
intel_crtc_state *new_crtc_state)
return !old_crtc_state->post_csc_lut;
}
-static bool glk_can_preload_luts(const struct intel_crtc_state *new_crtc_state)
-{
- struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
- struct intel_atomic_state *state =
- to_intel_atomic_state(new_crtc_state->uapi.state);
- const struct intel_crtc_state *old_crtc_state =
- intel_atomic_get_old_crtc_state(state, crtc);
-
- /*
- * The hardware degamma is active whenever the pipe
- * CSC is active. Thus even if the old state has no
- * software degamma we need to avoid clobbering the
- * linear hardware degamma mid scanout.
- */
- return !old_crtc_state->csc_enable &&
- !old_crtc_state->post_csc_lut;
-}
-
int intel_color_check(struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
@@ -1626,11 +1608,9 @@ static void glk_assign_luts(struct intel_crtc_state
*crtc_state)
* On GLK+ both pipe CSC and degamma LUT are controlled
* by csc_enable. Hence for the cases where the CSC is
* needed but degamma LUT is not we need to load a
- * linear degamma LUT. In fact we'll just always load
- * the degama LUT so that we don't have to reload
- * it every time the pipe CSC is being enabled.
+ * linear degamma LUT.
*/
- if (!crtc_state->pre_csc_lut)
+ if (crtc_state->csc_enable && !crtc_state->pre_csc_lut)
drm_property_replace_blob(&crtc_state->pre_csc_lut,
i915->display.color.glk_linear_degamma_lut);
}
@@ -1671,7 +1651,7 @@ static int glk_color_check(struct intel_crtc_state
*crtc_state)
glk_assign_luts(crtc_state);
- crtc_state->preload_luts = glk_can_preload_luts(crtc_state);
+ crtc_state->preload_luts = intel_can_preload_luts(crtc_state);
return 0;
}
--
2.37.4
