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.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