From 57dd5414a087991d427067b32dc3324af61b1c8b Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 29 Apr 2016 11:49:04 +0200
Subject: [PATCH] ALSA: usb-audio: Limit retrying sample rate reads
There are many USB audio devices with buggy firmware that don't react
with the sample rate reading properly. This often results in the
flood of error messages and slowing down the operation.
The sample rate read back is basically only for confirming the sample
rate setup, and it's not critically important. As a compromise, in
this patch, we stop the sample rate read back once when the device
gives errors more than tolerance (twice, as of now). This should
improve most of error cases while we still can catch the firmware
bugginess.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/usb/clock.c | 4 ++++
sound/usb/usbaudio.h | 1 +
2 files changed, 5 insertions(+)
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index 7ccbcaf6a14764..26dd5f20f14943 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -309,6 +309,9 @@ static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
* support reading */
if (snd_usb_get_sample_rate_quirk(chip))
return 0;
+ /* the firmware is likely buggy, don't repeat to fail too many times */
+ if (chip->sample_rate_read_error > 2)
+ return 0;
if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN,
@@ -316,6 +319,7 @@ static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
data, sizeof(data))) < 0) {
dev_err(&dev->dev, "%d:%d: cannot get freq at ep %#x\n",
iface, fmt->altsetting, ep);
+ chip->sample_rate_read_error++;
return 0; /* some devices don't support reading */
}
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index a161c7c1b12665..89b6853030de59 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -50,6 +50,7 @@ struct snd_usb_audio {
int num_interfaces;
int num_suspended_intf;
+ int sample_rate_read_error;
struct list_head pcm_list; /* list of pcm streams */
struct list_head ep_list; /* list of audio-related endpoints */
--
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