From 0ebaa24c6b1f62839bcd12d63fa76e3cf23b9bd0 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 11 Jan 2011 18:11:04 +0100 Subject: 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 Cc: --- sound/pci/hda/patch_hdmi.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 27e8597f66a..8804c05b5fc 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -31,10 +31,15 @@ #include #include #include +#include #include #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) -- cgit v1.2.3-70-g09d2