drm: Add drm_format_num_planes() utility function

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

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rob Clark <rob.clark@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 0cd2ba1..84a4a80 100644 (file)
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -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);

diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h
index e88b7d7..37515d1 100644 (file)
--- 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