> -----Original Message-----
> From: Ville Syrjälä <[email protected]>
> Sent: Wednesday, November 24, 2021 8:23 PM
> To: Shankar, Uma <[email protected]>
> Cc: [email protected]; [email protected]
> Subject: Re: [Intel-gfx] [PATCH 2/3] drm/i915/xelpd: Enable Pipe Degamma
>
> On Wed, Nov 24, 2021 at 01:06:48AM +0530, Uma Shankar wrote:
> > Enable Pipe Degamma for XE_LPD. Extend the legacy implementation to
> > incorparate the extended lut size for XE_LPD.
> >
> > Signed-off-by: Uma Shankar <[email protected]>
> > ---
> > drivers/gpu/drm/i915/display/intel_color.c | 12 +++++++++---
> > 1 file changed, 9 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_color.c
> > b/drivers/gpu/drm/i915/display/intel_color.c
> > index e529dbeee525..81046d5ab509 100644
> > --- a/drivers/gpu/drm/i915/display/intel_color.c
> > +++ b/drivers/gpu/drm/i915/display/intel_color.c
> > @@ -815,6 +815,12 @@ static void glk_load_degamma_lut(const struct
> intel_crtc_state *crtc_state)
> > enum pipe pipe = crtc->pipe;
> > int i, lut_size = INTEL_INFO(dev_priv)->color.degamma_lut_size;
> > const struct drm_color_lut *lut = crtc_state->hw.degamma_lut->data;
> > + u32 extended_lut_size;
> > +
> > + if (DISPLAY_VER(dev_priv) >= 13)
> > + extended_lut_size = 131;
> > + else
> > + extended_lut_size = 35;
>
> Can you extract that into a small helper? IIRC I did that for the internal
> version
> already.
Ok sure, will update this.
Regards,
Uma Shankar
> >
> > /*
> > * When setting the auto-increment bit, the hardware seems to @@
> > -827,8 +833,8 @@ static void glk_load_degamma_lut(const struct
> > intel_crtc_state *crtc_state)
> >
> > for (i = 0; i < lut_size; i++) {
> > /*
> > - * First 33 entries represent range from 0 to 1.0
> > - * 34th and 35th entry will represent extended range
> > + * First lut_size entries represent range from 0 to 1.0
> > + * 3 additional lut entries will represent extended range
> > * inputs 3.0 and 7.0 respectively, currently clamped
> > * at 1.0. Since the precision is 16bit, the user
> > * value can be directly filled to register.
> > @@ -844,7 +850,7 @@ static void glk_load_degamma_lut(const struct
> intel_crtc_state *crtc_state)
> > }
> >
> > /* Clamp values > 1.0. */
> > - while (i++ < 35)
> > + while (i++ < extended_lut_size)
> > intel_de_write_fw(dev_priv, PRE_CSC_GAMC_DATA(pipe), 1 << 16);
> >
> > intel_de_write_fw(dev_priv, PRE_CSC_GAMC_INDEX(pipe), 0);
> > --
> > 2.25.1
>
> --
> Ville Syrjälä
> Intel
