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Commit d0d110e0 authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Dave Airlie
Browse files

drm: Add drm_format_num_planes() utility function 



This function returns the number of planes used by a specific pixel
format.

Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarRob Clark <rob.clark@linaro.org>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent c7548837

drivers/gpu/drm/drm_crtc_helper.c

+33 −0
Original line number Diff line number Diff line
@@ -1015,3 +1015,36 @@ void drm_helper_hpd_irq_event(struct drm_device *dev) 
		queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);

}

EXPORT_SYMBOL(drm_helper_hpd_irq_event);





/**

 * drm_format_num_planes - get the number of planes for format

 * @format: pixel format (DRM_FORMAT_*)

 *

 * RETURNS:

 * The number of planes used by the specified pixel format.

 */

int drm_format_num_planes(uint32_t format)

{

	switch (format) {

	case DRM_FORMAT_YUV410:

	case DRM_FORMAT_YVU410:

	case DRM_FORMAT_YUV411:

	case DRM_FORMAT_YVU411:

	case DRM_FORMAT_YUV420:

	case DRM_FORMAT_YVU420:

	case DRM_FORMAT_YUV422:

	case DRM_FORMAT_YVU422:

	case DRM_FORMAT_YUV444:

	case DRM_FORMAT_YVU444:

		return 3;

	case DRM_FORMAT_NV12:

	case DRM_FORMAT_NV21:

	case DRM_FORMAT_NV16:

	case DRM_FORMAT_NV61:

		return 2;

	default:

		return 1;

	}

}

EXPORT_SYMBOL(drm_format_num_planes);

include/drm/drm_crtc_helper.h

+3 −0
Original line number Diff line number Diff line
@@ -144,4 +144,7 @@ extern void drm_helper_hpd_irq_event(struct drm_device *dev); 


extern void drm_kms_helper_poll_disable(struct drm_device *dev);

extern void drm_kms_helper_poll_enable(struct drm_device *dev);



extern int drm_format_num_planes(uint32_t format);



#endif