On 5/12/2023 2:24 PM, Takashi Iwai wrote:
On Fri, 12 May 2023 14:00:54 +0200,
Amadeusz Sławiński wrote:
On 5/12/2023 1:33 PM, Takashi Iwai wrote:
On Fri, 12 May 2023 13:23:49 +0200,
Takashi Iwai wrote:
On Thu, 11 May 2023 19:20:17 +0200,
Amadeusz Sławiński wrote:
On 5/11/2023 5:58 PM, Takashi Iwai wrote:
On Thu, 11 May 2023 17:31:37 +0200,
Amadeusz Sławiński wrote:
On 5/10/2023 2:21 PM, Takashi Iwai wrote:
On Tue, 09 May 2023 12:10:06 +0200,
Amadeusz Sławiński wrote:
Then capture stream starts and seems to assume that
registers were already set, so it doesn't write them to hw.
... it seems this didn't happen, and that's the inconsistency.
So the further question is:
At the point just before you start recording, is the codec in runtime
suspended? Or it's running?
If it's runtime-suspended, snd_hda_regmap_sync() must be called from
alc269_resume() via runtime-resume, and this must write out the
cached values. Then the bug can be along with that line.
Or if it's running, it means that the previous check of
snd_hdac_keep_power_up() was bogus (or racy).
Well, it is in... let's call it semi powered state. When snd_hda_intel
driver is loaded with power_save=X option it sets timeout to X seconds
and problem only happens when I start the stream before those X
seconds pass and it runs first runtime suspend. After it suspends it
then uses standard pm_runtime_resume and works correctly. That's why
the pm_runtime_force_suspend(&codec->core.dev); mentioned in first
email in thread "fixes" the problem, as it forces it to be instantly
suspended instead of waiting for timeout and then later normal
resume-play/record-suspend flow can be followed.
Hm, then maybe it's a bad idea to rely on the usage count there.
Even if the usage is 0, the device can be still active, and the update
can be missed.
How about the patch like below?
Scratch that, it returns a wrong value.
A simpler version like below works instead?
Yes it was broken, arecord didn't even start capturing ;)
Takashi
--- a/sound/hda/hdac_device.c
+++ b/sound/hda/hdac_device.c
@@ -611,10 +611,9 @@ EXPORT_SYMBOL_GPL(snd_hdac_power_up_pm);
int snd_hdac_keep_power_up(struct hdac_device *codec)
{
if (!atomic_inc_not_zero(&codec->in_pm)) {
- int ret = pm_runtime_get_if_in_use(&codec->dev);
- if (!ret)
+ if (!pm_runtime_active(&codec->dev))
return -1;
- if (ret < 0)
+ if (pm_runtime_get_sync(&codec->dev) < 0)
return 0;
}
return 1;
This one seems to work, as in I'm able to record before first suspend
hits. However device stays in D0 when no stream is running...
# cat /sys/devices/pci0000\:00/0000\:00\:0e.0/power_state
D0
OK, one step forward. The previous change was bad in anyway, as we
shouldn't sync there at all.
So, the problem becomes clearer now: it's in the lazy update mechanism
that misses the case that has to be written.
Scratch the previous one again, and could you try the following one
instead?
Takashi
--- a/sound/hda/hdac_regmap.c
+++ b/sound/hda/hdac_regmap.c
@@ -293,8 +293,17 @@ static int hda_reg_write(void *context, unsigned int reg, unsigned int val)
if (verb != AC_VERB_SET_POWER_STATE) {
pm_lock = codec_pm_lock(codec);
- if (pm_lock < 0)
- return codec->lazy_cache ? 0 : -EAGAIN;
+ if (pm_lock < 0) {
+ /* skip the actual write if it's in lazy-update mode
+ * and only if the device is actually suspended;
+ * the usage count can be zero at transition phase
+ * (either suspending/resuming or auto-suspend sleep)
+ */
+ if (codec->lazy_cache &&
+ pm_runtime_suspended(&codec->dev))
+ return 0;
+ return -EAGAIN;
+ }
}
if (is_stereo_amp_verb(reg)) {
With this one we are back to same behavior as without it. When capture
is started before first suspend it records silence. After waiting for
timeout and suspend it records correctly.
