Commit 10a85120 authored by Thierry Reding's avatar Thierry Reding
Browse files

drm: Add HDMI infoframe helpers 



Add a generic helper to fill in an HDMI AVI infoframe with data
extracted from a DRM display mode.

Signed-off-by: default avatarThierry Reding <thierry.reding@avionic-design.de>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent f142d3bd

drivers/gpu/drm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
menuconfig DRM

	tristate "Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)"

	depends on (AGP || AGP=n) && !EMULATED_CMPXCHG && MMU

	select HDMI

	select I2C

	select I2C_ALGOBIT

	select DMA_SHARED_BUFFER

drivers/gpu/drm/drm_edid.c

+33 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
 */

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/hdmi.h>

#include <linux/i2c.h>

#include <linux/module.h>

#include <drm/drmP.h>
@@ -2856,3 +2857,35 @@ int drm_add_modes_noedid(struct drm_connector *connector, 
	return num_modes;

}

EXPORT_SYMBOL(drm_add_modes_noedid);



/**

 * drm_hdmi_avi_infoframe_from_display_mode() - fill an HDMI AVI infoframe with

 *                                              data from a DRM display mode

 * @frame: HDMI AVI infoframe

 * @mode: DRM display mode

 *

 * Returns 0 on success or a negative error code on failure.

 */

int

drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,

					 const struct drm_display_mode *mode)

{

	int err;



	if (!frame || !mode)

		return -EINVAL;



	err = hdmi_avi_infoframe_init(frame);

	if (err < 0)

		return err;



	frame->video_code = drm_match_cea_mode(mode);

	if (!frame->video_code)

		return 0;



	frame->picture_aspect = HDMI_PICTURE_ASPECT_NONE;

	frame->active_aspect = HDMI_ACTIVE_ASPECT_PICTURE;



	return 0;

}

EXPORT_SYMBOL(drm_hdmi_avi_infoframe_from_display_mode);

include/drm/drm_edid.h

+6 −0
Original line number Diff line number Diff line
@@ -247,6 +247,8 @@ struct edid { 
struct drm_encoder;

struct drm_connector;

struct drm_display_mode;

struct hdmi_avi_infoframe;



void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid);

int drm_av_sync_delay(struct drm_connector *connector,

		      struct drm_display_mode *mode);
@@ -254,4 +256,8 @@ struct drm_connector *drm_select_eld(struct drm_encoder *encoder, 
				     struct drm_display_mode *mode);

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);



#endif /* __DRM_EDID_H__ */