AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-16 13:46:44 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

drm: bridge/dw_hdmi-ahb-audio: parse ELD from HDMI driver

Browse Source 
Parse the ELD (EDID like data) stored from the HDMI driver to restrict
the sample rates and channels which are available to ALSA.  This causes
the ALSA device to reflect the capabilities of the overall audio path,
not just what is supported at the HDMI source interface level.

Tested-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2013-11-07 16:06:01 +00:00
parent 7ed6c665e1
commit f5ce405722
4 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/bridge/Kconfig
View File

@ -15,6 +15,7 @@ config DRM_DW_HDMI_AHB_AUDIO
tristate "Synopsis Designware AHB Audio interface"
depends on DRM_DW_HDMI && SND
select SND_PCM
select SND_PCM_ELD
select SND_PCM_IEC958
help
Support the AHB Audio interface which is part of the Synopsis

6
drivers/gpu/drm/bridge/dw_hdmi-ahb-audio.c
View File

@ -12,11 +12,13 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <drm/bridge/dw_hdmi.h>
#include <drm/drm_edid.h>
#include <sound/asoundef.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_drm_eld.h>
#include <sound/pcm_iec958.h>
#include "dw_hdmi-audio.h"
@ -286,6 +288,10 @@ static int dw_hdmi_open(struct snd_pcm_substream *substream)
runtime->hw = dw_hdmi_hw;
ret = snd_pcm_hw_constraint_eld(runtime, dw->data.eld);
if (ret < 0)
return ret;
ret = snd_pcm_limit_hw_rates(runtime);
if (ret < 0)
return ret;

1
drivers/gpu/drm/bridge/dw_hdmi-audio.h
View File

@ -8,6 +8,7 @@ struct dw_hdmi_audio_data {
void __iomem *base;
int irq;
struct dw_hdmi *hdmi;
u8 *eld;
};
#endif

3
drivers/gpu/drm/bridge/dw_hdmi.c
View File

@ -1533,6 +1533,8 @@ static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
drm_mode_connector_update_edid_property(connector, edid);
ret = drm_add_edid_modes(connector, edid);
/* Store the ELD */
drm_edid_to_eld(connector, edid);
kfree(edid);
} else {
dev_dbg(hdmi->dev, "failed to get edid\n");
@ -1873,6 +1875,7 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
audio.base = hdmi->regs;
audio.irq = irq;
audio.hdmi = hdmi;
audio.eld = hdmi->connector.eld;
pdevinfo.name = "dw-hdmi-ahb-audio";
pdevinfo.data = &audio;