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drm: Add HDMI infoframe helpers

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

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Thierry Reding 2012-11-21 15:31:35 +01:00
parent f142d3bd55
commit 10a8512008
3 changed files with 40 additions and 0 deletions
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1
drivers/gpu/drm/Kconfig
View file

@ -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

33
drivers/gpu/drm/drm_edid.c
View file

@ -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);

6
include/drm/drm_edid.h
View file

@ -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__ */