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drm: Add a helper to forge HDMI vendor infoframes 

This can then be used by DRM drivers to setup their vendor infoframes.

v2: Fix hmdi typo (Simon Farnsworth)
v3: Adapt to the hdmi_vendor_infoframe rename

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Simon Farnsworth <simon.farnsworth@onelan.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dave Airlie <airlied@gmail.com>
This commit is contained in:
Lespiau, Damien 2013-08-19 16:59:03 +01:00 committed by Dave Airlie
parent ae84b900b0
commit 83dd000865
2 changed files with 40 additions and 0 deletions
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36
drivers/gpu/drm/drm_edid.c
View File

@ -3263,3 +3263,39 @@ drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
return 0;
}
EXPORT_SYMBOL(drm_hdmi_avi_infoframe_from_display_mode);
/**
* drm_hdmi_vendor_infoframe_from_display_mode() - fill an HDMI infoframe with
* data from a DRM display mode
* @frame: HDMI vendor infoframe
* @mode: DRM display mode
*
* Note that there's is a need to send HDMI vendor infoframes only when using a
* 4k or stereoscopic 3D mode. So when giving any other mode as input this
* function will return -EINVAL, error that can be safely ignored.
*
* Returns 0 on success or a negative error code on failure.
*/
int
drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,
const struct drm_display_mode *mode)
{
int err;
u8 vic;
if (!frame || !mode)
return -EINVAL;
vic = drm_match_hdmi_mode(mode);
if (!vic)
return -EINVAL;
err = hdmi_vendor_infoframe_init(frame);
if (err < 0)
return err;
frame->vic = vic;
return 0;
}
EXPORT_SYMBOL(drm_hdmi_vendor_infoframe_from_display_mode);

4
include/drm/drm_edid.h
View File

@ -256,6 +256,7 @@ struct drm_encoder;
struct drm_connector;
struct drm_display_mode;
struct hdmi_avi_infoframe;
struct hdmi_vendor_infoframe;
void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid);
int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads);
@ -268,5 +269,8 @@ int drm_load_edid_firmware(struct drm_connector *connector);
int
drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
const struct drm_display_mode *mode);
int
drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,
const struct drm_display_mode *mode);
#endif /* __DRM_EDID_H__ */