[Intel-gfx] [PATCH 10/11] drm/i915: Add 180 degree primary plane rotation support

[Daniel Vetter]

On Thu, Jun 19, 2014 at 9:52 AM, Jindal, Sonika <sonika.jindal at intel.com> wrote:
>> No, this really should be done in
>> drm_fb_helper_restore_fbdev_mode_unlocked in drm_fb_helper.c. Well, in the
>> restore_fbdev_mode function in there. Once that's done and once omap is
>> also using the generic rotation properties (I think it is already) we can
>> remove the rotation handling code from omap's last_close. Please also
>> throw a (compile-tested-only) patch on top for that so that Rob Clark can
>> pick it up.
>> -Daniel
>>
> Ok, I will add it. So should I add a function pointer say reset_properties
> in crtc, which will be called from restore_fbdev_mode?

No, I think it should directly reset the relevant properties. This
might mean that we have to move the rotation property pointer to
struct drm_plane so that restore_fbdev_mode can get at it. Or we wrap
up a helper for internal property setting purposes which bails out if
the property isn't attached to the relevant object.

This way it will automatically work for all drivers that support
rotation. With a callback we still have the same problem that each
driver needs to do their own magic, which means they'll get it wrong.
Letting helpers take care of such details gives us a much stronger
platfrom with drm drivers.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch