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
......@@ -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);
......@@ -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
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