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Commit 83dd0008 authored by Lespiau, Damien's avatar Lespiau, Damien Committed by Dave Airlie
Browse files

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: default avatarDamien Lespiau <damien.lespiau@intel.com>
Reviewed-by: default avatarSimon Farnsworth <simon.farnsworth@onelan.co.uk>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarDave Airlie <airlied@gmail.com>
parent ae84b900

drivers/gpu/drm/drm_edid.c

+36 −0
Original line number Diff line number Diff line
@@ -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);

include/drm/drm_edid.h

+4 −0
Original line number Diff line number Diff line
@@ -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__ */