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Message-Id: <20230109143846.1966301-3-mwen@igalia.com>
Date: Mon, 9 Jan 2023 13:38:30 -0100
From: Melissa Wen <mwen@...lia.com>
To: maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch
Cc: Joshua Ashton <joshua@...ggi.es>, alex.hung@....com,
nicholas.kazlauskas@....com, sungjoon.kim@....com,
seanpaul@...omium.org, bhawanpreet.lakha@....com,
Shashank Sharma <shashank.sharma@....com>,
ville.syrjala@...ux.intel.com, kernel-dev@...lia.com,
laurent.pinchart+renesas@...asonboard.com,
Melissa Wen <mwen@...lia.com>, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 02/18] drm/drm_color_mgmt: add shaper LUT to color mgmt properties
Shaper LUT is used to shape the content after blending, i.e.,
de-linearize or normalize space before applying a 3D LUT color
correction. In the next patch, we add 3D LUT property to DRM color
management after this shaper LUT and before the current gamma LUT.
Signed-off-by: Melissa Wen <mwen@...lia.com>
---
drivers/gpu/drm/drm_atomic_state_helper.c | 4 ++++
drivers/gpu/drm/drm_atomic_uapi.c | 10 ++++++++++
drivers/gpu/drm/drm_color_mgmt.c | 18 ++++++++++++++++++
drivers/gpu/drm/drm_fb_helper.c | 3 +++
drivers/gpu/drm/drm_mode_config.c | 14 ++++++++++++++
include/drm/drm_crtc.h | 14 ++++++++++++--
include/drm/drm_mode_config.h | 12 ++++++++++++
include/drm/drm_mode_object.h | 2 +-
8 files changed, 74 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index bf31b9d92094..4bc860d6cf75 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -141,8 +141,11 @@ void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
drm_property_blob_get(state->degamma_lut);
if (state->ctm)
drm_property_blob_get(state->ctm);
+ if (state->shaper_lut)
+ drm_property_blob_get(state->shaper_lut);
if (state->gamma_lut)
drm_property_blob_get(state->gamma_lut);
+
state->mode_changed = false;
state->active_changed = false;
state->planes_changed = false;
@@ -214,6 +217,7 @@ void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state)
drm_property_blob_put(state->mode_blob);
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->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 79730fa1dd8e..5339350c858d 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -430,6 +430,14 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
&replaced);
state->color_mgmt_changed |= replaced;
return ret;
+ } else if (property == config->shaper_lut_property) {
+ ret = drm_atomic_replace_property_blob_from_id(dev,
+ &state->shaper_lut,
+ 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,
@@ -481,6 +489,8 @@ drm_atomic_crtc_get_property(struct drm_crtc *crtc,
*val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
else if (property == config->ctm_property)
*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->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 d021497841b8..cf6a998b4298 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -69,6 +69,24 @@
* boot-up state too. Drivers can access the blob for the color conversion
* matrix through &drm_crtc_state.ctm.
*
+ * “SHAPER_LUT”:
+ * Blob property to set the shaper lut shaping pixel data after the color
+ * transformation matrix and before applying 3D Lookup Table (3D LUT). It
+ * can be used to delinearize content to get an effective 3D LUT mapping.
+ * The data is interpreted as an array of &struct drm_color_lut elements.
+ *
+ * Setting this to NULL (blob property value set to 0) means 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.
+ *
+ * “SHAPER_LUT_SIZE”:
+ * Unsigned range property to give the size of the shaper lookup table to
+ * be set on the SHAPER_LUT 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
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 71edb80fe0fb..f8b4611cbb4a 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1129,8 +1129,11 @@ static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
NULL);
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->gamma_lut,
gamma_lut);
+
crtc_state->color_mgmt_changed |= replaced;
}
diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index 939d621c9ad4..6468cecc7081 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -354,6 +354,20 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
return -ENOMEM;
dev->mode_config.ctm_property = prop;
+ prop = drm_property_create(dev,
+ DRM_MODE_PROP_BLOB,
+ "SHAPER_LUT", 0);
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.shaper_lut_property = prop;
+
+ prop = drm_property_create_range(dev,
+ DRM_MODE_PROP_IMMUTABLE,
+ "SHAPER_LUT_SIZE", 0, UINT_MAX);
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.shaper_lut_size_property = prop;
+
prop = drm_property_create(dev,
DRM_MODE_PROP_BLOB,
"GAMMA_LUT", 0);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 8e1cbc75143e..7f289e0153aa 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -152,8 +152,9 @@ struct drm_crtc_state {
bool zpos_changed : 1;
/**
* @color_mgmt_changed: Color management properties have changed
- * (@gamma_lut, @degamma_lut or @ctm). Used by the atomic helpers and
- * drivers to steer the atomic commit control flow.
+ * (@shaper_lut, @gamma_lut, @degamma_lut or @ctm). Used by
+ * the atomic helpers and drivers to steer the atomic commit control
+ * flow.
*/
bool color_mgmt_changed : 1;
@@ -279,6 +280,15 @@ struct drm_crtc_state {
*/
struct drm_property_blob *gamma_lut;
+ /**
+ * @shaper_lut:
+ *
+ * Lookup table used to de-linearize pixel data for gamma correction.
+ * See drm_crtc_enable_color_mgmt(). The blob (if not NULL) is an array
+ * of &struct drm_color_lut.
+ */
+ struct drm_property_blob *shaper_lut;
+
/**
* @target_vblank:
*
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 6b5e01295348..c174d3a7c951 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -800,6 +800,18 @@ struct drm_mode_config {
* degamma LUT.
*/
struct drm_property *ctm_property;
+
+ /**
+ * @shaper_lut_property: Optional CRTC property to set the shaper LUT used to
+ * convert colors before 3D LUT conversion.
+ */
+ struct drm_property *shaper_lut_property;
+ /**
+ * @shaper_lut_size_property: Optional CRTC property for the size of the
+ * shaper LUT as supported by the driver (read-only).
+ */
+ struct drm_property *shaper_lut_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
diff --git a/include/drm/drm_mode_object.h b/include/drm/drm_mode_object.h
index 912f1e415685..5e75b51936e6 100644
--- a/include/drm/drm_mode_object.h
+++ b/include/drm/drm_mode_object.h
@@ -60,7 +60,7 @@ struct drm_mode_object {
void (*free_cb)(struct kref *kref);
};
-#define DRM_OBJECT_MAX_PROPERTY 24
+#define DRM_OBJECT_MAX_PROPERTY 26
/**
* struct drm_object_properties - property tracking for &drm_mode_object
*/
--
2.35.1
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