linux-kernel - Re: [PATCH v2 33/34] drm/amd/display: add plane CTM support

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Message-ID: <20230908144947.ih5z4x6wol2mcrod@mail.igalia.com>
Date:   Fri, 8 Sep 2023 13:49:47 -0100
From:   Melissa Wen <mwen@...lia.com>
To:     Harry Wentland <harry.wentland@....com>
Cc:     amd-gfx@...ts.freedesktop.org,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        sunpeng.li@....com, Alex Deucher <alexander.deucher@....com>,
        dri-devel@...ts.freedesktop.org, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
        Joshua Ashton <joshua@...ggi.es>,
        Sebastian Wick <sebastian.wick@...hat.com>,
        Xaver Hugl <xaver.hugl@...il.com>,
        Shashank Sharma <Shashank.Sharma@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        sungjoon.kim@....com, Alex Hung <alex.hung@....com>,
        Pekka Paalanen <pekka.paalanen@...labora.com>,
        Simon Ser <contact@...rsion.fr>, kernel-dev@...lia.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 33/34] drm/amd/display: add plane CTM support

On 09/06, Harry Wentland wrote:
> 
> 
> On 2023-08-10 12:03, Melissa Wen wrote:
> > Map the plane CTM driver-specific property to DC plane, instead of DC
> > stream. The remaining steps to program DPP block are already implemented
> > on DC shared-code.
> > 
> > Signed-off-by: Melissa Wen <mwen@...lia.com>
> > ---
> >  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  1 +
> >  .../amd/display/amdgpu_dm/amdgpu_dm_color.c   | 25 +++++++++++++++++++
> >  2 files changed, 26 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> > index dfe61c5ed49e..f239410234b3 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> > @@ -9578,6 +9578,7 @@ static bool should_reset_plane(struct drm_atomic_state *state,
> >  		if (dm_old_other_state->degamma_tf != dm_new_other_state->degamma_tf ||
> >  		    dm_old_other_state->degamma_lut != dm_new_other_state->degamma_lut ||
> >  		    dm_old_other_state->hdr_mult != dm_new_other_state->hdr_mult ||
> > +		    dm_old_other_state->ctm != dm_new_other_state->ctm ||
> >  		    dm_old_other_state->shaper_lut != dm_new_other_state->shaper_lut ||
> >  		    dm_old_other_state->shaper_tf != dm_new_other_state->shaper_tf ||
> >  		    dm_old_other_state->lut3d != dm_new_other_state->lut3d ||
> > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
> > index 86a918ab82be..7ff329101fd4 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
> > @@ -1158,6 +1158,8 @@ int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
> >  				      struct dc_plane_state *dc_plane_state)
> >  {
> >  	struct amdgpu_device *adev = drm_to_adev(crtc->base.state->dev);
> > +	struct dm_plane_state *dm_plane_state = to_dm_plane_state(plane_state);
> > +	struct drm_color_ctm *ctm = NULL;
> >  	struct dc_color_caps *color_caps = NULL;
> >  	bool has_crtc_cm_degamma;
> >  	int ret;
> > @@ -1209,6 +1211,29 @@ int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
> >  			return ret;
> >  	}
> >  
> > +	/* Setup CRTC CTM. */
> > +	if (dm_plane_state->ctm) {
> > +		ctm = (struct drm_color_ctm *)dm_plane_state->ctm->data;
> > +
> > +		/*
> > +		 * So far, if we have both plane and CRTC CTM, plane CTM takes
> > +		 * the priority and we discard data for CRTC CTM, as
> > +		 * implemented in dcn10_program_gamut_remap().  However, we
> 
> Isn't it the opposite? If stream (crtc) has a CTM we program that, only if
> stream doesn't have a CTM we program the plane one?

yeah, you're right. It was an intermediate approach that was discarded.
Indeed, I think I need to rewrite it to better describe that CRTC CTM
priority regarding DPP gamut remap matrix.

Thanks for pointing it out.

Melissa

> 
> Harry
> 
> > +		 * have MPC gamut_remap_matrix from DCN3 family, therefore we
> > +		 * can remap MPC programing of the matrix to MPC block and
> > +		 * provide support for both DPP and MPC matrix at the same
> > +		 * time.
> > +		 */
> > +		__drm_ctm_to_dc_matrix(ctm, dc_plane_state->gamut_remap_matrix.matrix);
> > +
> > +		dc_plane_state->gamut_remap_matrix.enable_remap = true;
> > +		dc_plane_state->input_csc_color_matrix.enable_adjustment = false;
> > +	} else {
> > +		/* Bypass CTM. */
> > +		dc_plane_state->gamut_remap_matrix.enable_remap = false;
> > +		dc_plane_state->input_csc_color_matrix.enable_adjustment = false;
> > +	}
> > +
> >  	return amdgpu_dm_plane_set_color_properties(plane_state,
> >  						    dc_plane_state, color_caps);
> >  }
>