We currently have drm_atomic_helper_legacy_gamma_set() helper which can
be used to handle legacy gamma-set ioctl.
drm_atomic_helper_legacy_gamma_set() sets GAMMA_LUT, and clears
CTM and DEGAMMA_LUT. This works fine on HW where we have either:
degamma -> ctm -> gamma -> out
or
ctm -> gamma -> out
However, if the HW has gamma table before ctm, the atomic property
should be DEGAMMA_LUT, and thus we have:
degamma -> ctm -> out
This is fine for userspace which sets gamma table using the properties,
as the userspace can check for the existence of gamma & degamma, but the
legacy gamma-set ioctl does not work.
This patch fixes the issue by changing
drm_atomic_helper_legacy_gamma_set() so that GAMMA_LUT will be used if
it exists, and DEGAMMA_LUT will be used as a fallback.
Signed-off-by: Tomi Valkeinen <tomi.valkei...@ti.com>
---
drivers/gpu/drm/drm_atomic_helper.c | 18 +++++++++++++++---
drivers/gpu/drm/drm_color_mgmt.c | 4 ++++
include/drm/drm_crtc.h | 3 +++
3 files changed, 22 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c
b/drivers/gpu/drm/drm_atomic_helper.c
index ba1507036f26..fe59c8ea42a9 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -3512,6 +3512,10 @@ EXPORT_SYMBOL(drm_atomic_helper_page_flip_target);
* that support color management through the DEGAMMA_LUT/GAMMA_LUT
* properties. See drm_crtc_enable_color_mgmt() and the containing chapter for
* how the atomic color management and gamma tables work.
+ *
+ * This function uses the GAMMA_LUT or DEGAMMA_LUT property for the gamma
table.
+ * GAMMA_LUT property is used if it exists, and DEGAMMA_LUT property is used as
+ * a fallback.
*/
int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
u16 *red, u16 *green, u16 *blue,
@@ -3525,6 +3529,12 @@ int drm_atomic_helper_legacy_gamma_set(struct drm_crtc
*crtc,
struct drm_color_lut *blob_data;
int i, ret = 0;
bool replaced;
+ bool use_degamma;
+
+ if (!crtc->has_gamma_prop && !crtc->has_degamma_prop)
+ return -ENODEV;
+
+ use_degamma = !crtc->has_gamma_prop;
state = drm_atomic_state_alloc(crtc->dev);
if (!state)
@@ -3554,10 +3564,12 @@ int drm_atomic_helper_legacy_gamma_set(struct drm_crtc
*crtc,
goto fail;
}
- /* Reset DEGAMMA_LUT and CTM properties. */
- replaced = drm_property_replace_blob(&crtc_state->degamma_lut, NULL);
+ /* Set GAMMA/DEGAMMA_LUT and reset DEGAMMA/GAMMA_LUT and CTM */
+ replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
+ use_degamma ? blob : NULL);
replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
- replaced |= drm_property_replace_blob(&crtc_state->gamma_lut, blob);
+ replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
+ use_degamma ? NULL : blob);
crtc_state->color_mgmt_changed |= replaced;
ret = drm_atomic_commit(state);
diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
index 3bcabc2f6e0e..956e59d5f6a7 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -176,6 +176,8 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
degamma_lut_size);
}
+ crtc->has_degamma_prop = !!degamma_lut_size;
+
if (has_ctm)
drm_object_attach_property(&crtc->base,
config->ctm_property, 0);
@@ -187,6 +189,8 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
config->gamma_lut_size_property,
gamma_lut_size);
}
+
+ crtc->has_gamma_prop = !!gamma_lut_size;
}
EXPORT_SYMBOL(drm_crtc_enable_color_mgmt);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index ba839e5e357d..9e1f06047e3d 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1084,6 +1084,9 @@ struct drm_crtc {
*/
uint16_t *gamma_store;
+ bool has_gamma_prop;
+ bool has_degamma_prop;
+
/** @helper_private: mid-layer private data */
const struct drm_crtc_helper_funcs *helper_private;
--
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Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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