[PATCH 11/16] drm/i915: Add pipe level Gamma correction for CHV/BSW

[Matt Roper]

On Tue, Jul 21, 2015 at 04:40:08PM +0530, Malladi, Kausal wrote:
> On Tuesday 21 July 2015 05:33 AM, Matt Roper wrote:
> >On Wed, Jul 15, 2015 at 06:39:35PM +0530, Kausal Malladi wrote:
...
> >>diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> >>index 11d491e..9e994fc 100644
> >>--- a/drivers/gpu/drm/i915/intel_display.c
> >>+++ b/drivers/gpu/drm/i915/intel_display.c
> >>@@ -13773,6 +13773,9 @@ static void intel_begin_crtc_commit(struct drm_crtc *crtc)
> >>  	if (!needs_modeset(crtc->state) && INTEL_INFO(dev)->gen >= 9)
> >>  		skl_detach_scalers(intel_crtc);
> >>+
> >>+	if (!needs_modeset(crtc->state))
> >>+		intel_color_manager_crtc_commit(dev, crtc->state);
> >It's not immediately clear to me why this is only for the
> >'!needs_modeset' case.  Does color management get setup somewhere else
> >in cases where a display update does involve a modeset?
> This is just an extra precaution. Do you think that we should remove it?
> 
> Kausal

It seems to me that if you updated your color settings in the process of
also doing a full modeset, then those new settings wouldn't take effect
until you followed up with another, non-modeset, pageflip.  Unless I'm
overlooking something that would cause them to be programmed on the
first frame anyway?


Matt

-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795