From: Ville Syrjälä ville.syrjala@linux.intel.com
This function returns the number of planes used by a specific pixel format.
Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com --- drivers/gpu/drm/drm_crtc_helper.c | 33 +++++++++++++++++++++++++++++++++ include/drm/drm_crtc_helper.h | 3 +++ 2 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c index ccbdc0b..f388708 100644 --- a/drivers/gpu/drm/drm_crtc_helper.c +++ b/drivers/gpu/drm/drm_crtc_helper.c @@ -979,3 +979,36 @@ 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); diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h index e88b7d7..37515d1 100644 --- a/include/drm/drm_crtc_helper.h +++ b/include/drm/drm_crtc_helper.h @@ -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