[RFC PATCH v2 4/9] drm/drm_color_mgmt: add 3D LUT to color mgmt properties
Melissa Wen
mwen at igalia.com
Tue Sep 6 16:46:23 UTC 2022
Add 3D LUT for gammar correction using a 3D lookup table. The position
in the color correction pipeline where 3D LUT is applied depends on hw
design, being after CTM or gamma. If just after CTM, a shaper lut must
be set to shape the content for a non-linear space. That details should
be handled by the driver according to its color capabilities.
Signed-off-by: Melissa Wen <mwen at igalia.com>
---
drivers/gpu/drm/drm_atomic_state_helper.c | 3 ++
drivers/gpu/drm/drm_atomic_uapi.c | 10 ++++
drivers/gpu/drm/drm_color_mgmt.c | 58 +++++++++++++++++++++++
drivers/gpu/drm/drm_fb_helper.c | 2 +
drivers/gpu/drm/drm_mode_config.c | 14 ++++++
include/drm/drm_color_mgmt.h | 4 ++
include/drm/drm_crtc.h | 12 ++++-
include/drm/drm_mode_config.h | 13 +++++
8 files changed, 115 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index bf3222fbf4bb..cad579c66248 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -141,6 +141,8 @@ void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
drm_property_blob_get(state->ctm);
if (state->shaper_lut)
drm_property_blob_get(state->shaper_lut);
+ if (state->lut3d)
+ drm_property_blob_get(state->lut3d);
if (state->gamma_lut)
drm_property_blob_get(state->gamma_lut);
@@ -216,6 +218,7 @@ void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state)
drm_property_blob_put(state->degamma_lut);
drm_property_blob_put(state->ctm);
drm_property_blob_put(state->shaper_lut);
+ drm_property_blob_put(state->lut3d);
drm_property_blob_put(state->gamma_lut);
}
EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state);
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index ee78f4f5976d..041b00faebe9 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -437,6 +437,14 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
&replaced);
state->color_mgmt_changed |= replaced;
return ret;
+ } else if (property == config->lut3d_property) {
+ ret = drm_atomic_replace_property_blob_from_id(dev,
+ &state->lut3d,
+ val,
+ -1, sizeof(struct drm_color_lut),
+ &replaced);
+ state->color_mgmt_changed |= replaced;
+ return ret;
} else if (property == config->gamma_lut_property) {
ret = drm_atomic_replace_property_blob_from_id(dev,
&state->gamma_lut,
@@ -490,6 +498,8 @@ drm_atomic_crtc_get_property(struct drm_crtc *crtc,
*val = (state->ctm) ? state->ctm->base.id : 0;
else if (property == config->shaper_lut_property)
*val = (state->shaper_lut) ? state->shaper_lut->base.id : 0;
+ else if (property == config->lut3d_property)
+ *val = (state->lut3d) ? state->lut3d->base.id : 0;
else if (property == config->gamma_lut_property)
*val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
else if (property == config->prop_out_fence_ptr)
diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
index 873cca35f078..a87bfb866bcb 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -87,6 +87,25 @@
* publish the largest size, and sub-sample smaller sized LUTs
* appropriately.
*
+ * “LUT3D”:
+ * Blob property to set the 3D LUT mapping pixel data after the color
+ * transformation matrix and before gamma 1D lut correction. The
+ * data is interpreted as an array of &struct drm_color_lut elements.
+ * Hardware might choose not to use the full precision of the LUT
+ * elements.
+ *
+ * Setting this to NULL (blob property value set to 0) means a the output
+ * color is identical to the input color. This is generally the driver
+ * boot-up state too. Drivers can access this blob through
+ * &drm_crtc_state.gamma_lut.
+ *
+ * “LUT3D_SIZE”:
+ * Unsigned range property to give the size of the 3D lookup table to be
+ * set on the LUT3D property (the size depends on the underlying
+ * hardware). If drivers support multiple LUT sizes then they should
+ * publish the largest size, and sub-sample smaller sized LUTs
+ * appropriately.
+ *
* “GAMMA_LUT”:
* Blob property to set the gamma lookup table (LUT) mapping pixel data
* after the transformation matrix to data sent to the connector. The
@@ -208,6 +227,45 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
}
EXPORT_SYMBOL(drm_crtc_enable_color_mgmt);
+/**
+ * drm_crtc_enable_lut3d - enable 3D LUT properties
+ * @crtc: DRM CRTC
+ * @shaper_lut_size: the size of shaper lut
+ * @lut3d_size: the size of 3D lut
+ *
+ * This function lets the driver enable the 3D LUT color correction property
+ * on a CRTC. This includes 3D LUT and also a shaper LUT, if set. The shaper
+ * LUT property is only attached if its size is not 0 and 3D LUT is set, being
+ * therefore optional.
+ */
+void drm_crtc_enable_lut3d(struct drm_crtc *crtc,
+ uint shaper_lut_size,
+ uint lut3d_size)
+{
+ struct drm_device *dev = crtc->dev;
+ struct drm_mode_config *config = &dev->mode_config;
+
+ if (!lut3d_size)
+ return;
+
+ drm_object_attach_property(&crtc->base,
+ config->lut3d_property, 0);
+ drm_object_attach_property(&crtc->base,
+ config->lut3d_size_property,
+ lut3d_size);
+ if (!shaper_lut_size)
+ return;
+
+ drm_object_attach_property(&crtc->base,
+ config->shaper_lut_property, 0);
+ drm_object_attach_property(&crtc->base,
+ config->shaper_lut_size_property,
+ shaper_lut_size);
+
+}
+EXPORT_SYMBOL(drm_crtc_enable_lut3d);
+
+
/**
* drm_mode_crtc_set_gamma_size - set the gamma table size
* @crtc: CRTC to set the gamma table size for
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 20c4878bd4d9..a91db904392e 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1100,6 +1100,8 @@ static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
replaced |= drm_property_replace_blob(&crtc_state->shaper_lut,
NULL);
+ replaced |= drm_property_replace_blob(&crtc_state->lut3d,
+ NULL);
replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
gamma_lut);
diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index 4ba2a95b88e8..5458a7dfbe63 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -364,6 +364,20 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
return -ENOMEM;
dev->mode_config.shaper_lut_size_property = prop;
+ prop = drm_property_create(dev,
+ DRM_MODE_PROP_BLOB,
+ "LUT3D", 0);
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.lut3d_property = prop;
+
+ prop = drm_property_create_range(dev,
+ DRM_MODE_PROP_IMMUTABLE,
+ "LUT3D_SIZE", 0, UINT_MAX);
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.lut3d_size_property = prop;
+
prop = drm_property_create(dev,
DRM_MODE_PROP_BLOB,
"GAMMA_LUT", 0);
diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index 81c298488b0c..a4f054e0108f 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -59,6 +59,10 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
bool has_ctm,
uint gamma_lut_size);
+void drm_crtc_enable_lut3d(struct drm_crtc *crtc,
+ uint shaper_lut_size,
+ uint lut3d_size);
+
int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
int gamma_size);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 21938780d4bd..1ac61001e0e7 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -165,7 +165,7 @@ struct drm_crtc_state {
bool zpos_changed : 1;
/**
* @color_mgmt_changed: Color management properties have changed
- * (@shaper_lut, @gamma_lut, @degamma_lut or @ctm). Used by
+ * (@shaper_lut, @lut3d, @gamma_lut, @degamma_lut or @ctm). Used by
* the atomic helpers and drivers to steer the atomic commit control
* flow.
*/
@@ -302,6 +302,16 @@ struct drm_crtc_state {
*/
struct drm_property_blob *shaper_lut;
+ /**
+ * @lut3d:
+ *
+ * 3D Lookup table for converting pixel data. Position where it takes
+ * place depends on hw design, after @ctm or @gamma_lut. See
+ * drm_crtc_enable_color_mgmt(). The blob (if not NULL) is an array of
+ * &struct drm_color_lut.
+ */
+ struct drm_property_blob *lut3d;
+
/**
* @target_vblank:
*
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index c174d3a7c951..c15be4e88f6b 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -812,6 +812,19 @@ struct drm_mode_config {
*/
struct drm_property *shaper_lut_size_property;
+ /**
+ * @lut3d_property: Optional CRTC property to set the 3D LUT used to
+ * convert colors; before or after gamma conversion depends on hw
+ * design. A shaper LUT can be used to delinearize content before apply
+ * 3D LUT correction.
+ */
+ struct drm_property *lut3d_property;
+ /**
+ * @lut3d_size_property: Optional CRTC property for the size of the
+ * 3D LUT as supported by the driver (read-only).
+ */
+ struct drm_property *lut3d_size_property;
+
/**
* @gamma_lut_property: Optional CRTC property to set the LUT used to
* convert the colors, after the CTM matrix, to the gamma space of the
--
2.35.1
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