[Intel-gfx] [PATCH 10/23] drm/i915: Add gamma correction handlers

[Sharma, Shashank]

Regards
Shashank

On 9/22/2015 6:45 PM, Daniel Vetter wrote:
> On Wed, Sep 16, 2015 at 11:07:07PM +0530, Shashank Sharma wrote:
>> I915 driver registers gamma correction as palette correction
>> property with DRM layer. This patch adds set_property() and get_property()
>> handlers for pipe level gamma correction.
>>
>> The set function attaches the Gamma correction blob to CRTC state, these
>> values will be committed during atomic commit.
>>
>> Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
>> Signed-off-by: Kausal Malladi <kausalmalladi at gmail.com>
>> ---
>>   drivers/gpu/drm/i915/intel_atomic.c        | 20 ++++++++++++++++++++
>>   drivers/gpu/drm/i915/intel_color_manager.c | 21 +++++++++++++++++++++
>>   drivers/gpu/drm/i915/intel_drv.h           |  5 +++++
>>   3 files changed, 46 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
>> index 500d2998..0b61fef 100644
>> --- a/drivers/gpu/drm/i915/intel_atomic.c
>> +++ b/drivers/gpu/drm/i915/intel_atomic.c
>> @@ -315,6 +315,13 @@ int intel_crtc_atomic_set_property(struct drm_crtc *crtc,
>>   				   struct drm_property *property,
>>   				   uint64_t val)
>>   {
>> +	struct drm_device *dev = crtc->dev;
>> +	struct drm_mode_config *config = &dev->mode_config;
>> +
>> +	if (property == config->cm_palette_after_ctm_property)
>> +		return intel_color_manager_set_pipe_gamma(dev, state,
>> +				&crtc->base, val);
>> +
>>   	DRM_DEBUG_KMS("Unknown crtc property '%s'\n", property->name);
>>   	return -EINVAL;
>>   }
>> @@ -324,6 +331,19 @@ int intel_crtc_atomic_get_property(struct drm_crtc *crtc,
>>   				   struct drm_property *property,
>>   				   uint64_t *val)
>>   {
>> +	struct drm_device *dev = crtc->dev;
>> +	struct drm_mode_config *config = &dev->mode_config;
>> +
>> +	if (property == config->cm_palette_after_ctm_property) {
>> +		*val = (state->palette_after_ctm_blob) ?
>> +			state->palette_after_ctm_blob->base.id : 0;
>> +		goto found;
>> +	}
>
> Since color manager properties are meant as a new standardize KMS
> extension (we put them into the core drm_crtc_state) the get/set support
> should also be in the core. See e.g. how the rotation property is handled
> in drm_atomic_plane_get/set_property. So all this code should be added to
> drm_atomic_crtc_get/set_property.
Thanks, sounds like a good one. Will move this.
>
>
>> +
>>   	DRM_DEBUG_KMS("Unknown crtc property '%s'\n", property->name);
>>   	return -EINVAL;
>> +
>> +found:
>> +	DRM_DEBUG_KMS("Found property %s\n", property->name);
>> +	return 0;
>>   }
>> diff --git a/drivers/gpu/drm/i915/intel_color_manager.c b/drivers/gpu/drm/i915/intel_color_manager.c
>> index 77f58f2..9421bb6 100644
>> --- a/drivers/gpu/drm/i915/intel_color_manager.c
>> +++ b/drivers/gpu/drm/i915/intel_color_manager.c
>> @@ -27,6 +27,27 @@
>>
>>   #include "intel_color_manager.h"
>>
>> +int intel_color_manager_set_pipe_gamma(struct drm_device *dev,
>> +		struct drm_crtc_state *crtc_state,
>> +		struct drm_mode_object *obj, uint32_t blob_id)
>> +{
>> +	struct drm_property_blob *blob;
>> +
>> +	blob = drm_property_lookup_blob(dev, blob_id);
>> +	if (!blob) {
>> +		DRM_DEBUG_KMS("Invalid Blob ID\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	if (crtc_state->palette_after_ctm_blob)
>> +		drm_property_unreference_blob(
>> +			crtc_state->palette_after_ctm_blob);
>> +
>> +	/* Attach the blob to be committed in state */
>> +	crtc_state->palette_after_ctm_blob = blob;
>> +	return 0;
>> +}
>
> What is this used for? It looks a bit like legacy property code, and we
> have a generic helper to make that happen
> (drm_atomic_helper_crtc_set_property).
>
No Daniel, its not the legacy part. Please check atomic_begin() part in 
the next patches. This is like the top half of atomic set_property for 
CRTC and will be applicable for any property. As you already know, to 
set a property:
- userspace creates a blob, and sends the blob id via set_property() 
interface
- set_property() saves the blob_id in the corresponding pointer space in 
the crtc_state()
- From the atomic_commit_begin() we will extract the values from blob 
and start committing to the registers. Its kind of bottom_half() of 
atomic set_property for CRTC.
> Generally please don't add functions/structs without also adding a user,
> it means that reviewers have to constantly jump around in your patch
> series to figure out how something is used. Instead if you want to split
> things up really fine add a stub function frist (but including relevant
> callers) and then fill out the bits separately.
I think the above explanation should make it clear.
> -Daniel
>
>> +
>>   int get_pipe_capabilities(struct drm_device *dev,
>>   		struct drm_palette_caps *palette_caps, struct drm_crtc *crtc)
>>   {
>> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
>> index e27e754..d0193e2 100644
>> --- a/drivers/gpu/drm/i915/intel_drv.h
>> +++ b/drivers/gpu/drm/i915/intel_drv.h
>> @@ -1466,4 +1466,9 @@ void intel_plane_destroy_state(struct drm_plane *plane,
>>   			       struct drm_plane_state *state);
>>   extern const struct drm_plane_helper_funcs intel_plane_helper_funcs;
>>
>> +/* intel_color_manager.c */
>> +int intel_color_manager_set_pipe_gamma(struct drm_device *dev,
>> +		struct drm_crtc_state *crtc_state,
>> +		struct drm_mode_object *obj, uint32_t blob_id);
>> +
>>   #endif /* __INTEL_DRV_H__ */
>> --
>> 1.9.1
>>
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>