Takashi Iwai kirjoitti 2013-10-07 13:43:
At Mon, 07 Oct 2013 13:31:17 +0300, Anssi Hannula wrote:
Takashi Iwai kirjoitti 2013-10-07 10:48:
At Wed, 2 Oct 2013 21:13:32 +0300, Anssi Hannula wrote:
Currently hdmi_setup_audio_infoframe() reprograms the HDA channel mapping only when the infoframe is not up-to-date or the non-PCM flag has changed.
However, when just the channel map has been changed, the infoframe may still be up-to-date and non-PCM flag may not have changed, so the new channel map is not actually programmed into the HDA codec.
Notably, this failing case is also always triggered when the device is already in a prepared state and a new channel map is configured while changing only the channel positions (for example, plain "speaker-test -c2 -m FR,FL").
Fix that by keeping track of the last programmed channel map and making hdmi_setup_audio_infoframe() always update the hardware mapping if the channel map has changed.
Hmm, maybe it's easier (and safer) to remove the check and always call hdmi_setup_channel_mapping()? Of course, the drawback is the unnecessary verbs, but it's not too much.
Easier, yes. I don't really have that good of an idea how big of a delay do 8 write verbs cause, so I'll rely on your judgment :)
I guess I could replace the writes with read-and-write-if-differs cycles when I add the set_slot ops for ATI/AMD, since it seems to be used for other similar cases (like channel count)?
Well, this would result in more cost, as read requires a sync.
Hmm, so why does e.g. converter channel count set-up use that, then?
If any, we can use the cached write/update. But this assumes that the hardware never clears the value by some operation internally.
It should not, but better be safe than sorry here (at least for stable) :)
Signed-off-by: Anssi Hannula anssi.hannula@iki.fi Cc: stable@vger.kernel.org
BTW, is there some mechanism preventing hdmi_chmap_ctl_put() to be called at the same time with generic_hdmi_playback_pcm_prepare() that I didn't see with a quick look? Both of them call hdmi_setup_audio_infoframe() which is not thread-safe.
Yeah, we need to introduce a mutex there.
I guess hdmi_present_sense() is the same, as it can also call hdmi_setup_audio_infoframe()?
Hm, looking at the code, we have already pin_eld->lock in hdmi_present_sense(). This can be used in other places, too.
Well, hdmi_setup_audio_infoframe() is non-threadsafe for other reasons than eld as well (e.g. write verbs to hw), though, so it might be a bit confusing as-is. Better move/rename the lock if we end up using it? Or not?
(And pin_eld->monitor_present change at the beginning of hdmi_present_sense() should be protected in the mutex, too...)
BTW, shouldn't hdmi_present_sense() call hdmi_setup_audio_infoframe() always when eld_changed is true? hdmi_setup_audio_infoframe() does not do its stuff if !monitor_present, so if one starts playback before plugging in, the channel mappings etc will never be set even when plug-in happens (from what I can see, that is - did not test yet).
Well, there is such a call but currently specific to Haswell because it hasn't been tested for others. Maybe we can simply get rid of is_haswell() check there.
OK, will test later and provide a patch if it works as expected.
thanks,
Takashi
sound/pci/hda/patch_hdmi.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 7ea0245..09f38a1 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -74,6 +74,8 @@ struct hdmi_spec_per_pin { bool non_pcm; bool chmap_set; /* channel-map override by ALSA API? */ unsigned char chmap[8]; /* ALSA API channel-map */
- bool last_chmap_set; /* channel-map override programmed? */
- unsigned char last_chmap[8]; /* last programmed channel-map */ char pcm_name[8]; /* filled in build_pcm callbacks */
};
@@ -955,15 +957,21 @@ static void hdmi_setup_audio_infoframe(struct hda_codec *codec, ai.bytes, sizeof(ai)); hdmi_start_infoframe_trans(codec, pin_nid); } else {
/* For non-pcm audio switch, setup new channel mapping* accordingly */if (per_pin->non_pcm != non_pcm)
/* For non-pcm audio switch or channel-map switch,* setup new channel mapping accordingly */if (per_pin->non_pcm != non_pcm|| per_pin->chmap_set != per_pin->last_chmap_set|| (per_pin->chmap_set && memcmp(per_pin->chmap,per_pin->last_chmap,
ARRAY_SIZE(per_pin->chmap)) != 0)) hdmi_setup_channel_mapping(codec, pin_nid, non_pcm, ca, channels, per_pin->chmap, per_pin->chmap_set);}
per_pin->non_pcm = non_pcm;
per_pin->last_chmap_set = per_pin->chmap_set;
if (per_pin->chmap_set)
memcpy(per_pin->last_chmap, per_pin->chmap,ARRAY_SIZE(per_pin->chmap)); }
-- 1.8.1.5