[PATCH 06/16] drm/i915: Load gamma color capabilities for CHV CRTC

[Matt Roper]

On Wed, Jul 15, 2015 at 06:39:30PM +0530, Kausal Malladi wrote:
> As per Color Manager design, each driver is responsible to load its
> palette color correction and enhancement capabilities in the form of
> a DRM blob property, so that user space can query and read.
> 
> This patch loads all CHV platform specific gamma color capabilities
> for CRTC into a blob that can be accessible by user space to
> query capabilities via DRM property interface.
> 
> Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
> Signed-off-by: Kausal Malladi <Kausal.Malladi at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_color_manager.c | 48 ++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_color_manager.h |  4 +++
>  2 files changed, 52 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_color_manager.c b/drivers/gpu/drm/i915/intel_color_manager.c
> index baa4536..def20d0f 100644
> --- a/drivers/gpu/drm/i915/intel_color_manager.c
> +++ b/drivers/gpu/drm/i915/intel_color_manager.c
> @@ -27,15 +27,63 @@
>  
>  #include "intel_color_manager.h"
>  
> +int get_chv_pipe_gamma_capabilities(struct drm_device *dev,
> +		struct drm_palette_caps *palette_caps, struct drm_crtc *crtc)
> +{
> +	struct drm_property_blob *blob = NULL;
> +	struct drm_mode_config *config = &dev->mode_config;
> +	int ret;
> +
> +	/*
> +	 * This function exposes best capability for DeGamma and Gamma
> +	 * For CHV, the DeGamma LUT has 65 entries
> +	 * and the best Gamma capability has 257 entries (CGM unit)
> +	 */
> +	palette_caps->version = CHV_PALETTE_STRUCT_VERSION;
> +	palette_caps->num_samples_before_ctm =
> +		CHV_DEGAMMA_MAX_VALS;
> +	palette_caps->num_samples_after_ctm =
> +		CHV_10BIT_GAMMA_MAX_VALS;
> +
> +	ret = drm_property_replace_global_blob(dev, &blob,

We're only calling this once at startup and never actually replacing the
capabilities, right?  Is there any difference between this and just
manually doing a drm_property_create_blob() and passing that blob's ID
as the value when we attach the property to the CRTC?  It feels a bit
strange to be calling 'replace' on a local variable that isn't
initialized and is never used/saved.


> +			sizeof(struct drm_palette_caps),
> +			(const void *)palette_caps,
> +			&crtc->base, config->prop_color_capabilities);
> +	if (ret) {
> +		DRM_ERROR("Error updating Gamma blob\n");
> +		return -EFAULT;
> +	}
> +
> +	return 0;
> +}
> +
> +int get_pipe_gamma_capabilities(struct drm_device *dev,
> +		struct drm_palette_caps *palette_caps, struct drm_crtc *crtc)
> +{
> +	if (IS_CHERRYVIEW(dev))
> +		return get_chv_pipe_gamma_capabilities(dev, palette_caps, crtc);
> +	return -EINVAL;
> +}
> +
>  void intel_attach_color_properties_to_crtc(struct drm_device *dev,
>  		struct drm_mode_object *mode_obj)
>  {
>  	struct drm_mode_config *config = &dev->mode_config;
> +	struct drm_palette_caps *palette_caps;
> +	struct drm_crtc *crtc;
> +	int ret;
>  
>  	if (IS_CHERRYVIEW(dev)) {
> +		crtc = obj_to_crtc(mode_obj);
>  		if (config->prop_color_capabilities)
>  			drm_object_attach_property(mode_obj,
>  					config->prop_color_capabilities, 0);
> +		palette_caps = kzalloc(sizeof(struct drm_palette_caps),
> +				GFP_KERNEL);
> +		ret = get_pipe_gamma_capabilities(dev, palette_caps, crtc);

Is palette_caps ever freed?  I believe the data is copied when a blob is
created, so I think you should be free to kfree() this allocation right
away.


Matt

> +		if (ret)
> +			DRM_ERROR("Error getting gamma capability for CHV\n");
> +
>  		if (config->prop_palette_before_ctm)
>  			drm_object_attach_property(mode_obj,
>  					config->prop_palette_before_ctm, 0);
> diff --git a/drivers/gpu/drm/i915/intel_color_manager.h b/drivers/gpu/drm/i915/intel_color_manager.h
> index 04c921d..51aeb91 100644
> --- a/drivers/gpu/drm/i915/intel_color_manager.h
> +++ b/drivers/gpu/drm/i915/intel_color_manager.h
> @@ -27,3 +27,7 @@
>  #include <drm/drmP.h>
>  #include <drm/drm_crtc_helper.h>
>  #include "i915_drv.h"
> +
> +#define CHV_PALETTE_STRUCT_VERSION		1
> +#define CHV_DEGAMMA_MAX_VALS			65
> +#define CHV_10BIT_GAMMA_MAX_VALS		257
> -- 
> 2.4.5
> 

-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795