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| author | Geoffrey D. Bennett <g@b4.vu> | 2025-07-28 19:00:35 +0930 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-15 12:14:12 +0200 |
| commit | e1c508818cba27c0ef44dd0f3ee487c205eb6abd (patch) | |
| tree | b37ab8a19a0e27d6a3ec9b72b52384019e12dc0b /drivers/platform/x86/intel/pmt/class.h | |
| parent | 0f158abad0ce0a1e7df0b420b6e6afba91179183 (diff) | |
ALSA: scarlett2: Add retry on -EPROTO from scarlett2_usb_tx()
commit 8a15ca0ca51399b652b1bbb23b590b220cf03d62 upstream.
During communication with Focusrite Scarlett Gen 2/3/4 USB audio
interfaces, -EPROTO is sometimes returned from scarlett2_usb_tx(),
snd_usb_ctl_msg() which can cause initialisation and control
operations to fail intermittently.
This patch adds up to 5 retries in scarlett2_usb(), with a delay
starting at 5ms and doubling each time. This follows the same approach
as the fix for usb_set_interface() in endpoint.c (commit f406005e162b
("ALSA: usb-audio: Add retry on -EPROTO from usb_set_interface()")),
which resolved similar -EPROTO issues during device initialisation,
and is the same approach as in fcp.c:fcp_usb().
Fixes: 9e4d5c1be21f ("ALSA: usb-audio: Scarlett Gen 2 mixer interface")
Closes: https://github.com/geoffreybennett/linux-fcp/issues/41
Cc: stable@vger.kernel.org
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://patch.msgid.link/aIdDO6ld50WQwNim@m.b4.vu
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/platform/x86/intel/pmt/class.h')
0 files changed, 0 insertions, 0 deletions