On 17 January 2018 at 16:05, Takashi Iwai tiwai@suse.de wrote:
On Wed, 17 Jan 2018 15:08:27 +0100, Mirza Krak wrote:
On 12 January 2018 at 19:04, Takashi Iwai tiwai@suse.de wrote:
On Fri, 12 Jan 2018 14:36:45 +0100, Mirza Krak wrote:
< snip >
The EBADFD is already indicating a fatal error, and something is wrong in the driver. Basically the driver should suspend the stream via snd_pcm_suspend*() call in the PM resume ops. Most likely your driver misses that.
That said, it's specific to your using driver, and you'd need to take a look at that code there.
Thank you for you patience with me.
I have looked further in to my hardware drivers and I can not really see any faults here.
But I did some further testing and applying the following diff on aplay "resolves" the problem (v1.1.4 of alsa-utils):
diff --git a/aplay/aplay.c b/aplay/aplay.c index f793c82..040cec1 100644 --- a/aplay/aplay.c +++ b/aplay/aplay.c @@ -2020,6 +2020,8 @@ static ssize_t pcm_write(u_char *data, size_t count) if (test_position) do_test_position(); if (r == -EAGAIN || (r >= 0 && (size_t)r < count)) {
if (snd_pcm_state(handle) == SND_PCM_STATE_SUSPENDED)suspend(); if (!test_nowait) snd_pcm_wait(handle, 100); } else if (r == -EPIPE) {Which means that there is no error in regard to suspending the stream as it properly reports this when checked.
My problem is that this condition:
(r >= 0 && (size_t)r < count)Is always true after a suspend/resume cycle. Which normally does not result in a "resume" call from aplay nor from snd_pcm_recover, which means that it will try to write data to a suspended stream which results in -EBADFD due to this (from alsa-lib):
snd_pcm_sframes_t snd_pcm_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size) { < snip >
if (bad_pcm_state(pcm, P_STATE_RUNNABLE)) return -EBADFD; return _snd_pcm_writei(pcm, buffer, size);}
Because SUSPENDED is not part of the P_STATE_RUNNABLE, which maybe it should be?
OK, that's a bug in alsa-lib, then. The sanity check is good, but it returns the inconsistent error code that doesn't match with the PCM state.
Could you try the patch below?
Yeah, the patch resolved my issues and the stream is resumed/reset after suspend properly. Tested with aplay and with custom application that uses snd_pcm_recover to handle return values from write.
You can add my:
Tested-by: Mirza Krak mirza.krak@gmail.com
If you like.