[Intel-gfx] [PATCH 12/12] drm/i915: Add PIPECONF YCbCr 4:4:4 programming for ILK-IVB

[Mun, Gwan-gyeong]

Except typo, the changes look good to me.
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
On Wed, 2019-09-18 at 19:05 +0000, Mun, Gwan-gyeong wrote:
> On Thu, 2019-07-18 at 17:50 +0300, Ville Syrjala wrote:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > 
> > On ILK-IVB the pipe colorspace is configured via PIPECONF
> > (as opposed to PIPEMISC in BDW+). Let's configure+readout
> > that stuff correctly.
> > 
> > Enablling YCbCr 4:4:4 output will now be a simple matter of
> Typo: Enablling -> Enabling
> > setting crtc_state->output_format appropriately in the encoder
> > .compute_config(). However, when we do that we must be
> > aware of the fact that YCbCr DP output doesn't seem to work
> > on ILK (resulting image is totally garbled), but on SNB+
> > it works fine. However HDMI YCbCr output does work correctly
> > even on ILK.
> > 
> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_display.c | 21
> > +++++++++++++++++++-
> >  drivers/gpu/drm/i915/i915_reg.h              |  4 ++++
> >  2 files changed, 24 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> > b/drivers/gpu/drm/i915/display/intel_display.c
> > index bd3ff96c1618..8e98715cd63b 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > @@ -9406,9 +9406,19 @@ static void ironlake_set_pipeconf(const
> > struct
> > intel_crtc_state *crtc_state)
> >  	else
> >  		val |= PIPECONF_PROGRESSIVE;
> >  
> > +	/*
> > +	 * This would end up with an odd purple hue over
> > +	 * the entire display. Make sure we don't do it.
> > +	 */
> > +	WARN_ON(crtc_state->limited_color_range &&
> > +		crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB);
> > +
> >  	if (crtc_state->limited_color_range)
> >  		val |= PIPECONF_COLOR_RANGE_SELECT;
> >  
> > +	if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB)
> > +		val |= PIPECONF_OUTPUT_COLORSPACE_YUV709;
> > +
> >  	val |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);
> >  
> >  	I915_WRITE(PIPECONF(pipe), val);
> > @@ -9945,7 +9955,6 @@ static bool ironlake_get_pipe_config(struct
> > intel_crtc *crtc,
> >  	if (!wakeref)
> >  		return false;
> >  
> > -	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
> >  	pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
> >  	pipe_config->shared_dpll = NULL;
> >  
> > @@ -9974,6 +9983,16 @@ static bool ironlake_get_pipe_config(struct
> > intel_crtc *crtc,
> >  	if (tmp & PIPECONF_COLOR_RANGE_SELECT)
> >  		pipe_config->limited_color_range = true;
> >  
> > +	switch (tmp & PIPECONF_OUTPUT_COLORSPACE_MASK) {
> > +	case PIPECONF_OUTPUT_COLORSPACE_YUV601:
> > +	case PIPECONF_OUTPUT_COLORSPACE_YUV709:
> > +		pipe_config->output_format =
> > INTEL_OUTPUT_FORMAT_YCBCR444;
> > +		break;
> > +	default:
> > +		pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
> > +		break;
> > +	}
> > +
> >  	pipe_config->gamma_mode = (tmp & PIPECONF_GAMMA_MODE_MASK_ILK)
> >  		PIPECONF_GAMMA_MODE_SHIFT;
> >  
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h
> > b/drivers/gpu/drm/i915/i915_reg.h
> > index 33d535ae0944..3d33a1e03a45 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -5712,6 +5712,10 @@ enum {
> >  #define   PIPECONF_CXSR_DOWNCLOCK	(1 << 16)
> >  #define   PIPECONF_EDP_RR_MODE_SWITCH_VLV	(1 << 14)
> >  #define   PIPECONF_COLOR_RANGE_SELECT	(1 << 13)
> > +#define   PIPECONF_OUTPUT_COLORSPACE_MASK	(3 << 11) /* ilk-ivb */
> > +#define   PIPECONF_OUTPUT_COLORSPACE_RGB	(0 << 11) /* ilk-ivb */
> > +#define   PIPECONF_OUTPUT_COLORSPACE_YUV601	(1 << 11) /*
> > ilk-ivb */
> > +#define   PIPECONF_OUTPUT_COLORSPACE_YUV709	(2 << 11) /*
> > ilk-ivb */
> >  #define   PIPECONF_OUTPUT_COLORSPACE_YUV_HSW	(1 << 11) /*
> > hsw only
> > */
> >  #define   PIPECONF_BPC_MASK	(0x7 << 5)
> >  #define   PIPECONF_8BPC		(0 << 5)
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