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authorTakashi Iwai <tiwai@suse.de>2011-01-11 18:11:04 +0100
committerTakashi Iwai <tiwai@suse.de>2011-01-12 07:46:06 +0100
commit0ebaa24c6b1f62839bcd12d63fa76e3cf23b9bd0 (patch)
treef03740bfda77daa50ec3b763633b10b138289edc /sound
parent6661702f2e803b55b50cc0471eb6b9254e99eef2 (diff)
downloadlinux-0ebaa24c6b1f62839bcd12d63fa76e3cf23b9bd0.tar.bz2
ALSA: hda - Add static_hdmi_pcm option to HDMI codec parser
The dynamic PCM restriction based on ELD information may lead to the problem in some cases, e.g. when the receiver is turned off. Then it may send a TV HDMI default such as channels = 2. Since it's still plugged, the driver doesn't know whether it's the right configuration for future use. Now, when an app opens the device at this moment, then turn on the receiver, the app still sends channels=2. The right solution is to implement some kind of notification and automatic re-open mechanism. But, this is a goal far ahead. This patch provides a workaround for such a case by providing a new module option static_hdmi_pcm for snd-hda-codec-hdmi module. When this is set to true, the driver doesn't change PCM parameters per ELD information. For users who need the static configuration like the scenario above, set this to true. The parameter can be changed dynamically via sysfs, too. Signed-off-by: Takashi Iwai <tiwai@suse.de> Cc: <stable@kernel.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/hda/patch_hdmi.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 27e8597f66ad..8804c05b5fc7 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -31,10 +31,15 @@
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
+#include <linux/moduleparam.h>
#include <sound/core.h>
#include "hda_codec.h"
#include "hda_local.h"
+static bool static_hdmi_pcm;
+module_param(static_hdmi_pcm, bool, 0644);
+MODULE_PARM_DESC(static_hdmi_pcm, "Don't restrict PCM parameters per ELD info");
+
/*
* The HDMI/DisplayPort configuration can be highly dynamic. A graphics device
* could support two independent pipes, each of them can be connected to one or
@@ -827,7 +832,7 @@ static int hdmi_pcm_open(struct hda_pcm_stream *hinfo,
*codec_pars = *hinfo;
eld = &spec->sink_eld[idx];
- if (eld->eld_valid && eld->sad_count > 0) {
+ if (!static_hdmi_pcm && eld->eld_valid && eld->sad_count > 0) {
hdmi_eld_update_pcm_info(eld, hinfo, codec_pars);
if (hinfo->channels_min > hinfo->channels_max ||
!hinfo->rates || !hinfo->formats)