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ALSA: usb-audio: work around streaming quirk for MacroSilicon MS2109 

commit 1b7ecc241a upstream.

Further investigation of the L-R swap problem on the MS2109 reveals that
the problem isn't that the channels are swapped, but rather that they
are swapped and also out of phase by one sample. In other words, the
issue is actually that the very first frame that comes from the hardware
is a half-frame containing only the right channel, and after that
everything becomes offset.

So introduce a new quirk field to drop the very first 2 bytes that come
in after the format is configured and a capture stream starts. This puts
the channels in phase and in the correct order.

Cc: stable@vger.kernel.org
Signed-off-by: Hector Martin <marcan@marcan.st>
Link: https://lore.kernel.org/r/20200810082400.225858-1-marcan@marcan.st
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Hector Martin 2020-08-10 17:24:00 +09:00 committed by Greg Kroah-Hartman
parent 1d2c4954e8
commit 10de419977
4 changed files with 11 additions and 0 deletions
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1
sound/usb/card.h
View File

@ -133,6 +133,7 @@ struct snd_usb_substream {
unsigned int tx_length_quirk:1; /* add length specifier to transfers */
unsigned int fmt_type; /* USB audio format type (1-3) */
unsigned int pkt_offset_adj; /* Bytes to drop from beginning of packets (for non-compliant devices) */
unsigned int stream_offset_adj; /* Bytes to drop from beginning of stream (for non-compliant devices) */
unsigned int running: 1; /* running status */

6
sound/usb/pcm.c
View File

@ -1417,6 +1417,12 @@ static void retire_capture_urb(struct snd_usb_substream *subs,
// continue;
}
bytes = urb->iso_frame_desc[i].actual_length;
if (subs->stream_offset_adj > 0) {
unsigned int adj = min(subs->stream_offset_adj, bytes);
cp += adj;
bytes -= adj;
subs->stream_offset_adj -= adj;
}
frames = bytes / stride;
if (!subs->txfr_quirk)
bytes = frames * stride;

3
sound/usb/quirks.c
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@ -1432,6 +1432,9 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
case USB_ID(0x041e, 0x3f19): /* E-Mu 0204 USB */
set_format_emu_quirk(subs, fmt);
break;
case USB_ID(0x534d, 0x2109): /* MacroSilicon MS2109 */
subs->stream_offset_adj = 2;
break;
}
}

1
sound/usb/stream.c
View File

@ -94,6 +94,7 @@ static void snd_usb_init_substream(struct snd_usb_stream *as,
subs->tx_length_quirk = as->chip->tx_length_quirk;
subs->speed = snd_usb_get_speed(subs->dev);
subs->pkt_offset_adj = 0;
subs->stream_offset_adj = 0;
snd_usb_set_pcm_ops(as->pcm, stream);