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

[Daniel Vetter]

On Sat, Sep 26, 2015 at 09:18:48PM +0530, Sharma, Shashank wrote:
> On 9/23/2015 1:52 PM, Sharma, Shashank wrote:
> >>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.
> Actually, while implementing this, I realized that this change is not
> required.
> What we want to do in drm_atomic_crtc_get/set code is:
> if (prop == config->cm_palette_after_ctm_property || prop == 	
> 	config->cm_palette_before_ctm_property) {
> 	crtc->funcs->atomic_get_property();
> }
> 
> Which is already being done in the current code:
> else if (crtc->funcs->atomic_get_property)
> 	return crtc->funcs->atomic_get_property(crtc, state, property, val);

This code is to pass any property unknown to the drm core into the driver.
But since we want this to be a new drm core property set (that's why it's
in drm_crtc_state) the decoding should be done in the core too.

Note that atomic_get/set_property _only_ map between the property as seen
by userspace and the state structures. They're not allowed to do anything
else like compute derived state, check constraints or put the state into
the hw. That's for the atomic_check and atomic_commit callbacks. So for
this patchset here you should move all the code in the
atomic_get/set_property callbacks you add in i915 into the drm core. Like
it is doen for the rotation property.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch