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.h | 1 +
include/drm/drm_crtc_helper.h | 3 +++
3 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 68011bb..db59561 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -1011,3 +1011,36 @@ 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 (V4L2_PIX_FMT_*)
+ *
+ * See linux/videodev2.h for valid values of @format.
+ *
+ * RETURNS:
+ * The number of planes used by the specified pixel format.
+ */
+int drm_format_num_planes(uint32_t format)
+{
+ /* FIXME add all planar formats. */
+
+ switch (format) {
+ case V4L2_PIX_FMT_YUV410:
+ case V4L2_PIX_FMT_YVU410:
+ case V4L2_PIX_FMT_YUV420:
+ case V4L2_PIX_FMT_YVU420:
+ case V4L2_PIX_FMT_YUV411P:
+ case V4L2_PIX_FMT_YUV422P:
+ return 3;
+ case V4L2_PIX_FMT_NV12:
+ case V4L2_PIX_FMT_NV21:
+ case V4L2_PIX_FMT_NV16:
+ case V4L2_PIX_FMT_NV61:
+ return 2;
+ default:
+ return 1;
+ }
+}
+EXPORT_SYMBOL(drm_format_num_planes);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 49dc288..736d68d 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -902,4 +902,5 @@ extern int drm_mode_mmap_dumb_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv);
extern int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv);
+
#endif /* __DRM_CRTC_H__ */
diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h
index b4abb33..20a43f7 100644
--- a/include/drm/drm_crtc_helper.h
+++ b/include/drm/drm_crtc_helper.h
@@ -146,4 +146,7 @@ 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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