[PATCH v2 3/5] drm/vkms: Add atomic_helper_check_plane_state

[Sean Paul]

On Sat, Jul 14, 2018 at 03:21:13PM +0300, Haneen Mohammed wrote:
> Call atomic_helper_check_plane_state to clip plane coordinates.
> 
> Signed-off-by: Haneen Mohammed <hamohammed.sa at gmail.com>

Reviewed-by: Sean Paul <seanpaul at chromium.org>

> ---
> Changes in v2:
> - check for plane_state->visible since we can't handle a disabled
>   primary plane yet.
> 
>  drivers/gpu/drm/vkms/vkms_plane.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> index 877483984897..aaf7c35faed6 100644
> --- a/drivers/gpu/drm/vkms/vkms_plane.c
> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> @@ -7,6 +7,7 @@
>   */
>  
>  #include "vkms_drv.h"
> +#include <drm/drm_atomic.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_gem_framebuffer_helper.h>
>  #include <drm/drm_plane_helper.h>
> @@ -25,6 +26,33 @@ static void vkms_primary_plane_update(struct drm_plane *plane,
>  {
>  }
>  
> +static int vkms_plane_atomic_check(struct drm_plane *plane,
> +				   struct drm_plane_state *state)
> +{
> +	struct drm_crtc_state *crtc_state;
> +	int ret;
> +
> +	if (!state->fb | !state->crtc)
> +		return 0;
> +
> +	crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
> +	if (IS_ERR(crtc_state))
> +		return PTR_ERR(crtc_state);
> +
> +	ret = drm_atomic_helper_check_plane_state(state, crtc_state,
> +						  DRM_PLANE_HELPER_NO_SCALING,
> +						  DRM_PLANE_HELPER_NO_SCALING,
> +						  false, true);
> +	if (ret != 0)
> +		return ret;
> +
> +	/* for now primary plane must be visible and full screen */
> +	if (!state->visible)
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +
>  static int vkms_prepare_fb(struct drm_plane *plane,
>  			   struct drm_plane_state *state)
>  {
> @@ -58,6 +86,7 @@ static void vkms_cleanup_fb(struct drm_plane *plane,
>  
>  static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = {
>  	.atomic_update		= vkms_primary_plane_update,
> +	.atomic_check		= vkms_plane_atomic_check,
>  	.prepare_fb		= vkms_prepare_fb,
>  	.cleanup_fb		= vkms_cleanup_fb,
>  };
> -- 
> 2.17.1
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS