From 2b58fd5b3193fd3af3d15114d95706087d25a7fe Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Tue, 4 Sep 2012 10:23:07 +0200 Subject: [PATCH] ALSA: snd-usb: Add quirks for Playback Designs devices Playback Designs' USB devices have some hardware limitations on their USB interface. In particular: - They need a 20ms delay after each class compliant request as the hardware ACKs the USB packets before the device is actually ready for the next command. Sending data immediately will result in buffer overflows in the hardware. - The devices send bogus feedback data at the start of each stream which confuse the feedback format auto-detection. This patch introduces a new quirks hook that is called after each control packet and which adds a delay for all devices that match Playback Designs' USB VID for now. In addition, it adds a counter to snd_usb_endpoint to drop received packets on the floor. Another new quirks function that is called once an endpoint is started initializes that counter for these devices on their sync endpoint. Signed-off-by: Daniel Mack Reported-and-tested-by: Andreas Koch Supported-by: Demian Martin Signed-off-by: Takashi Iwai --- sound/usb/card.h | 2 ++ sound/usb/endpoint.c | 8 ++++++++ sound/usb/helper.c | 5 +++++ sound/usb/quirks.c | 24 ++++++++++++++++++++++++ sound/usb/quirks.h | 10 ++++++++++ 5 files changed, 49 insertions(+) diff --git a/sound/usb/card.h b/sound/usb/card.h index bcb5267a02e8..23b6f23bd36a 100644 --- a/sound/usb/card.h +++ b/sound/usb/card.h @@ -92,6 +92,8 @@ struct snd_usb_endpoint { unsigned char silence_value; unsigned int stride; int iface, alt_idx; + int skip_packets; /* quirks for devices to ignore the first n packets + in a stream */ spinlock_t lock; struct list_head list; diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index c41181202688..94b08a6087a3 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -31,6 +31,7 @@ #include "card.h" #include "endpoint.h" #include "pcm.h" +#include "quirks.h" #define EP_FLAG_ACTIVATED 0 #define EP_FLAG_RUNNING 1 @@ -170,6 +171,11 @@ static void retire_inbound_urb(struct snd_usb_endpoint *ep, { struct urb *urb = urb_ctx->urb; + if (unlikely(ep->skip_packets > 0)) { + ep->skip_packets--; + return; + } + if (ep->sync_slave) snd_usb_handle_sync_urb(ep->sync_slave, ep, urb); @@ -825,6 +831,8 @@ int snd_usb_endpoint_start(struct snd_usb_endpoint *ep) ep->unlink_mask = 0; ep->phase = 0; + snd_usb_endpoint_start_quirk(ep); + /* * If this endpoint has a data endpoint as implicit feedback source, * don't start the urbs here. Instead, mark them all as available, diff --git a/sound/usb/helper.c b/sound/usb/helper.c index 9eed8f40b179..c1db28f874c2 100644 --- a/sound/usb/helper.c +++ b/sound/usb/helper.c @@ -21,6 +21,7 @@ #include "usbaudio.h" #include "helper.h" +#include "quirks.h" /* * combine bytes and get an integer value @@ -97,6 +98,10 @@ int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request, memcpy(data, buf, size); kfree(buf); } + + snd_usb_ctl_msg_quirk(dev, pipe, request, requesttype, + value, index, data, size); + return err; } diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 27817266867a..0f58b4b6d702 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -761,3 +761,27 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs, } } +void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep) +{ + /* + * "Playback Design" products send bogus feedback data at the start + * of the stream. Ignore them. + */ + if ((le16_to_cpu(ep->chip->dev->descriptor.idVendor) == 0x23ba) && + ep->type == SND_USB_ENDPOINT_TYPE_SYNC) + ep->skip_packets = 4; +} + +void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe, + __u8 request, __u8 requesttype, __u16 value, + __u16 index, void *data, __u16 size) +{ + /* + * "Playback Design" products need a 20ms delay after each + * class compliant request + */ + if ((le16_to_cpu(dev->descriptor.idVendor) == 0x23ba) && + (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS) + mdelay(20); +} + diff --git a/sound/usb/quirks.h b/sound/usb/quirks.h index 03e5e94098cd..0ca9e91067a6 100644 --- a/sound/usb/quirks.h +++ b/sound/usb/quirks.h @@ -1,6 +1,10 @@ #ifndef __USBAUDIO_QUIRKS_H #define __USBAUDIO_QUIRKS_H +struct audioformat; +struct snd_usb_endpoint; +struct snd_usb_substream; + int snd_usb_create_quirk(struct snd_usb_audio *chip, struct usb_interface *iface, struct usb_driver *driver, @@ -20,4 +24,10 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs, int snd_usb_is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp); +void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep); + +void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe, + __u8 request, __u8 requesttype, __u16 value, + __u16 index, void *data, __u16 size); + #endif /* __USBAUDIO_QUIRKS_H */ -- GitLab