[PATCH 06/36] drm/amd/display: add CRTC driver-specific property for gamma TF
Melissa Wen
mwen at igalia.com
Tue Jun 6 16:57:53 UTC 2023
On 06/06, Sebastian Wick wrote:
> On Tue, Jun 6, 2023 at 6:19 PM Joshua Ashton <joshua at froggi.es> wrote:
> >
> >
> >
> > On 6/1/23 20:17, Harry Wentland wrote:
> > >
> > >
> > > On 5/23/23 18:14, Melissa Wen wrote:
> > >> Hook up driver-specific atomic operations for managing AMD color
> > >> properties and create AMD driver-specific color management properties
> > >> and attach them according to HW capabilities defined by `struct
> > >> dc_color_caps`. Add enumerated transfer function property to DRM CRTC
> > >> gamma to convert to wire encoding with or without a user gamma LUT.
> > >> Enumerated TFs are not supported yet by the DRM color pipeline,
> > >> therefore, create a DRM enum list with the predefined TFs supported by
> > >> the AMD display driver.
> > >>
> > >> Co-developed-by: Joshua Ashton <joshua at froggi.es>
> > >> Signed-off-by: Joshua Ashton <joshua at froggi.es>
> > >> Signed-off-by: Melissa Wen <mwen at igalia.com>
> > >> ---
> > >> drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 36 ++++++++++
> > >> drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h | 8 +++
> > >> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 22 ++++++
> > >> .../amd/display/amdgpu_dm/amdgpu_dm_crtc.c | 72 ++++++++++++++++++-
> > >> 4 files changed, 137 insertions(+), 1 deletion(-)
> > >>
> > >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> > >> index 389396eac222..88af075e6c18 100644
> > >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> > >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> > >> @@ -1247,6 +1247,38 @@ amdgpu_display_user_framebuffer_create(struct drm_device *dev,
> > >> return &amdgpu_fb->base;
> > >> }
> > >>
> > >> +static const struct drm_prop_enum_list drm_transfer_function_enum_list[] = {
> > >> + { DRM_TRANSFER_FUNCTION_DEFAULT, "Default" },
> > >> + { DRM_TRANSFER_FUNCTION_SRGB, "sRGB" },
> > >> + { DRM_TRANSFER_FUNCTION_BT709, "BT.709" },
> > >> + { DRM_TRANSFER_FUNCTION_PQ, "PQ (Perceptual Quantizer)" },
> > >> + { DRM_TRANSFER_FUNCTION_LINEAR, "Linear" },
> > >> + { DRM_TRANSFER_FUNCTION_UNITY, "Unity" },
> > >> + { DRM_TRANSFER_FUNCTION_HLG, "HLG (Hybrid Log Gamma)" },
> > >> + { DRM_TRANSFER_FUNCTION_GAMMA22, "Gamma 2.2" },
> > >> + { DRM_TRANSFER_FUNCTION_GAMMA24, "Gamma 2.4" },
> > >> + { DRM_TRANSFER_FUNCTION_GAMMA26, "Gamma 2.6" },
> > >> +};
> > >
> > > Let's not use the DRM_/drm_ prefix here. It might clash later when
> > > we introduce DRM_ core interfaces for enumerated transfer functions.
> > >
> > > We'll want to specify whether something is an EOTF or an inverse EOTF,
> > > or possibly an OETF. Of course that wouldn't apply to "Linear" or
> > > "Unity" (I'm assuming the two are the same?).
> > >
> > > EOTF = electro-optical transfer function
> > > This is the transfer function to go from the encoded value to an
> > > optical (linear) value.
> > >
> > > Inverse EOTF = simply the inverse of the EOTF
> > > This is usually intended to go from an optical/linear space (which
> > > might have been used for blending) back to the encoded values.
> > >
> > > OETF = opto-electronic transfer function
> > > This is usually used for converting optical signals into encoded
> > > values. Usually that's done on the camera side but I think HLG might
> > > define the OETF instead of the EOTF. A bit fuzzy on that. If you're
> > > unclear about HLG I recommend we don't include it yet.
> > >
> > > It would also be good to document a bit more what each of the TFs
> > > mean, but I'm fine if that comes later with a "driver-agnostic"
> > > API. The key thing to clarify is whether we have an EOTF or inv_EOTF,
> > > i.e. whether we use the TF to go from encoded to optical or vice
> > > versa.
> >
> > Whether we use the inverse or not is just determined per-block though.
> >
> > I think we should definitely document it per-block very explicitly
> > (whether it is EOTF or inv EOTF) but I don't think we need to touch the
> > enums here.
>
> Either the drm prefix has to be removed or the enum variant names have
> to be explicitly be the EOTF, OETF, inverse EOTF or inverse OETF.
I'm okay on using `AMD_` prefix instead of `DRM_` for this
driver-specific implementation. I think the position of each block in
the pipeline already describe the conversion type, since we only
implemented one conversion type per-block. So, I agree we can keep it
simple as Joshua suggested (don't extend enum, just document blocks -
should it be a kernel doc?).
Melissa
>
> > - Joshie 🐸✨
> >
> > >
> > > I know DC is sloppy and doesn't define those but it will still use
> > > them as either EOTF or inv_EOTF, based on which block they're being
> > > programmed, if I'm not mistaken.
> > >
> > >> +
> > >> +#ifdef AMD_PRIVATE_COLOR
> > >> +static int
> > >> +amdgpu_display_create_color_properties(struct amdgpu_device *adev)
> > >> +{
> > >> + struct drm_property *prop;
> > >> +
> > >> + prop = drm_property_create_enum(adev_to_drm(adev),
> > >> + DRM_MODE_PROP_ENUM,
> > >> + "AMD_REGAMMA_TF",
> > >> + drm_transfer_function_enum_list,
> > >> + ARRAY_SIZE(drm_transfer_function_enum_list));
> > >> + if (!prop)
> > >> + return -ENOMEM;
> > >> + adev->mode_info.regamma_tf_property = prop;
> > >> +
> > >> + return 0;
> > >> +}
> > >> +#endif
> > >> +
> > >
> > > It'd be nice if we have this function and the above enum_list
> > > in amdgpu_dm, possibly in amdgpu_dm_color.c. You could call it
> > > directly after the amdgpu_display_modeset_create_prop() call in
> > > amdgpu_dm_mode_config_init().
> > >
> > >> const struct drm_mode_config_funcs amdgpu_mode_funcs = {
> > >> .fb_create = amdgpu_display_user_framebuffer_create,
> > >> };
> > >> @@ -1323,6 +1355,10 @@ int amdgpu_display_modeset_create_props(struct amdgpu_device *adev)
> > >> return -ENOMEM;
> > >> }
> > >>
> > >> +#ifdef AMD_PRIVATE_COLOR
> > >> + if (amdgpu_display_create_color_properties(adev))
> > >> + return -ENOMEM;
> > >> +#endif
> > >> return 0;
> > >> }
> > >>
> > >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
> > >> index b8633df418d4..881446c51b36 100644
> > >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
> > >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
> > >> @@ -344,6 +344,14 @@ struct amdgpu_mode_info {
> > >> int disp_priority;
> > >> const struct amdgpu_display_funcs *funcs;
> > >> const enum drm_plane_type *plane_type;
> > >> +
> > >> + /* Driver-private color mgmt props */
> > >> +
> > >> + /* @regamma_tf_property: Transfer function for CRTC regamma
> > >> + * (post-blending). Possible values are defined by `enum
> > >> + * drm_transfer_function`.
> > >> + */
> > >> + struct drm_property *regamma_tf_property;
> > >> };
> > >>
> > >> #define AMDGPU_MAX_BL_LEVEL 0xFF
> > >> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> > >> index 2e2413fd73a4..ad5ee28b83dc 100644
> > >> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> > >> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> > >> @@ -699,6 +699,20 @@ static inline void amdgpu_dm_set_mst_status(uint8_t *status,
> > >>
> > >> extern const struct amdgpu_ip_block_version dm_ip_block;
> > >>
> > >> +enum drm_transfer_function {
> > >> + DRM_TRANSFER_FUNCTION_DEFAULT,
> > >> + DRM_TRANSFER_FUNCTION_SRGB,
> > >> + DRM_TRANSFER_FUNCTION_BT709,
> > >> + DRM_TRANSFER_FUNCTION_PQ,
> > >> + DRM_TRANSFER_FUNCTION_LINEAR,
> > >> + DRM_TRANSFER_FUNCTION_UNITY,
> > >> + DRM_TRANSFER_FUNCTION_HLG,
> > >> + DRM_TRANSFER_FUNCTION_GAMMA22,
> > >> + DRM_TRANSFER_FUNCTION_GAMMA24,
> > >> + DRM_TRANSFER_FUNCTION_GAMMA26,
> > >> + DRM_TRANSFER_FUNCTION_MAX,
> > >> +};
> > >> +
> > >> struct dm_plane_state {
> > >> struct drm_plane_state base;
> > >> struct dc_plane_state *dc_state;
> > >> @@ -726,6 +740,14 @@ struct dm_crtc_state {
> > >> struct dc_info_packet vrr_infopacket;
> > >>
> > >> int abm_level;
> > >> +
> > >> + /**
> > >> + * @regamma_tf:
> > >> + *
> > >> + * Pre-defined transfer function for converting internal FB -> wire
> > >> + * encoding.
> > >> + */
> > >> + enum drm_transfer_function regamma_tf;
> > >
> > > Again, let's avoid a drm_ prefix. Maybe name all this amdgpu_ instead.
> > >
> > >> };
> > >>
> > >> #define to_dm_crtc_state(x) container_of(x, struct dm_crtc_state, base)
> > >> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
> > >> index e3762e806617..1eb279d341c5 100644
> > >> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
> > >> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
> > >> @@ -229,7 +229,6 @@ static void dm_crtc_destroy_state(struct drm_crtc *crtc,
> > >> if (cur->stream)
> > >> dc_stream_release(cur->stream);
> > >>
> > >> -
> > >
> > > nit: stray newline
> > >
> > > Harry
> > >
> > >> __drm_atomic_helper_crtc_destroy_state(state);
> > >>
> > >>
> > >> @@ -263,6 +262,7 @@ static struct drm_crtc_state *dm_crtc_duplicate_state(struct drm_crtc *crtc)
> > >> state->freesync_config = cur->freesync_config;
> > >> state->cm_has_degamma = cur->cm_has_degamma;
> > >> state->cm_is_degamma_srgb = cur->cm_is_degamma_srgb;
> > >> + state->regamma_tf = cur->regamma_tf;
> > >> state->crc_skip_count = cur->crc_skip_count;
> > >> state->mpo_requested = cur->mpo_requested;
> > >> /* TODO Duplicate dc_stream after objects are stream object is flattened */
> > >> @@ -299,6 +299,69 @@ static int amdgpu_dm_crtc_late_register(struct drm_crtc *crtc)
> > >> }
> > >> #endif
> > >>
> > >> +#ifdef AMD_PRIVATE_COLOR
> > >> +/**
> > >> + * drm_crtc_additional_color_mgmt - enable additional color properties
> > >> + * @crtc: DRM CRTC
> > >> + *
> > >> + * This function lets the driver enable the 3D LUT color correction property
> > >> + * on a CRTC. This includes shaper LUT, 3D LUT and regamma TF. The shaper
> > >> + * LUT and 3D LUT property is only attached if its size is not 0.
> > >> + */
> > >> +static void
> > >> +dm_crtc_additional_color_mgmt(struct drm_crtc *crtc)
> > >> +{
> > >> + struct amdgpu_device *adev = drm_to_adev(crtc->dev);
> > >> +
> > >> + if(adev->dm.dc->caps.color.mpc.ogam_ram)
> > >> + drm_object_attach_property(&crtc->base,
> > >> + adev->mode_info.regamma_tf_property,
> > >> + DRM_TRANSFER_FUNCTION_DEFAULT);
> > >> +}
> > >> +
> > >> +static int
> > >> +amdgpu_dm_atomic_crtc_set_property(struct drm_crtc *crtc,
> > >> + struct drm_crtc_state *state,
> > >> + struct drm_property *property,
> > >> + uint64_t val)
> > >> +{
> > >> + struct amdgpu_device *adev = drm_to_adev(crtc->dev);
> > >> + struct dm_crtc_state *acrtc_state = to_dm_crtc_state(state);
> > >> +
> > >> + if (property == adev->mode_info.regamma_tf_property) {
> > >> + if (acrtc_state->regamma_tf != val) {
> > >> + acrtc_state->regamma_tf = val;
> > >> + acrtc_state->base.color_mgmt_changed |= 1;
> > >> + }
> > >> + } else {
> > >> + drm_dbg_atomic(crtc->dev,
> > >> + "[CRTC:%d:%s] unknown property [PROP:%d:%s]]\n",
> > >> + crtc->base.id, crtc->name,
> > >> + property->base.id, property->name);
> > >> + return -EINVAL;
> > >> + }
> > >> +
> > >> + return 0;
> > >> +}
> > >> +
> > >> +static int
> > >> +amdgpu_dm_atomic_crtc_get_property(struct drm_crtc *crtc,
> > >> + const struct drm_crtc_state *state,
> > >> + struct drm_property *property,
> > >> + uint64_t *val)
> > >> +{
> > >> + struct amdgpu_device *adev = drm_to_adev(crtc->dev);
> > >> + struct dm_crtc_state *acrtc_state = to_dm_crtc_state(state);
> > >> +
> > >> + if (property == adev->mode_info.regamma_tf_property)
> > >> + *val = acrtc_state->regamma_tf;
> > >> + else
> > >> + return -EINVAL;
> > >> +
> > >> + return 0;
> > >> +}
> > >> +#endif
> > >> +
> > >> /* Implemented only the options currently available for the driver */
> > >> static const struct drm_crtc_funcs amdgpu_dm_crtc_funcs = {
> > >> .reset = dm_crtc_reset_state,
> > >> @@ -317,6 +380,10 @@ static const struct drm_crtc_funcs amdgpu_dm_crtc_funcs = {
> > >> #if defined(CONFIG_DEBUG_FS)
> > >> .late_register = amdgpu_dm_crtc_late_register,
> > >> #endif
> > >> +#ifdef AMD_PRIVATE_COLOR
> > >> + .atomic_set_property = amdgpu_dm_atomic_crtc_set_property,
> > >> + .atomic_get_property = amdgpu_dm_atomic_crtc_get_property,
> > >> +#endif
> > >> };
> > >>
> > >> static void dm_crtc_helper_disable(struct drm_crtc *crtc)
> > >> @@ -480,6 +547,9 @@ int amdgpu_dm_crtc_init(struct amdgpu_display_manager *dm,
> > >>
> > >> drm_mode_crtc_set_gamma_size(&acrtc->base, MAX_COLOR_LEGACY_LUT_ENTRIES);
> > >>
> > >> +#ifdef AMD_PRIVATE_COLOR
> > >> + dm_crtc_additional_color_mgmt(&acrtc->base);
> > >> +#endif
> > >> return 0;
> > >>
> > >> fail:
> > >
> >
>
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