From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
This function returns the number of planes used by a specific pixel
format.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
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
--
1.7.3.4
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