This patchset is a collection of fixes and clean ups found while
working on the uac2 gadget. Details are provided in each change.
The series depends on this fix [0] by Jack Pham to apply cleanly
[0]: https://lore.kernel.org/linux-usb/[email protected]/
Jerome Brunet (4):
usb: gadget: f_uac2: reset wMaxPacketSize
usb: gadget: u_audio: factorize ssize to alsa fmt conversion
usb: gadget: u_audio: remove struct uac_req
usb: gadget: u_audio: clean up locking
drivers/usb/gadget/function/f_uac2.c | 69 ++++++++++++---
drivers/usb/gadget/function/u_audio.c | 122 +++++++++++---------------
2 files changed, 105 insertions(+), 86 deletions(-)
--
2.29.2
snd_pcm_stream_lock() is held when the ALSA .trigger() callback is called.
The lock of 'struct uac_rtd_params' is not necessary since all its locking
operation are done under the snd_pcm_stream_lock() too.
Also, usb_request .complete() is called with irqs disabled, so saving and
restoring the irqs is not necessary.
Signed-off-by: Jerome Brunet <[email protected]>
---
drivers/usb/gadget/function/u_audio.c | 23 ++++-------------------
1 file changed, 4 insertions(+), 19 deletions(-)
diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
index 3eba31b8ebcb..d94f95edca40 100644
--- a/drivers/usb/gadget/function/u_audio.c
+++ b/drivers/usb/gadget/function/u_audio.c
@@ -36,9 +36,8 @@ struct uac_rtd_params {
void *rbuf;
unsigned int max_psize; /* MaxPacketSize of endpoint */
- struct usb_request **reqs;
- spinlock_t lock;
+ struct usb_request **reqs;
};
struct snd_uac_chip {
@@ -74,7 +73,6 @@ static const struct snd_pcm_hardware uac_pcm_hardware = {
static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req)
{
unsigned int pending;
- unsigned long flags, flags2;
unsigned int hw_ptr;
int status = req->status;
struct snd_pcm_substream *substream;
@@ -105,16 +103,14 @@ static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req)
if (!substream)
goto exit;
- snd_pcm_stream_lock_irqsave(substream, flags2);
+ snd_pcm_stream_lock(substream);
runtime = substream->runtime;
if (!runtime || !snd_pcm_running(substream)) {
- snd_pcm_stream_unlock_irqrestore(substream, flags2);
+ snd_pcm_stream_unlock(substream);
goto exit;
}
- spin_lock_irqsave(&prm->lock, flags);
-
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
/*
* For each IN packet, take the quotient of the current data
@@ -141,8 +137,6 @@ static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req)
hw_ptr = prm->hw_ptr;
- spin_unlock_irqrestore(&prm->lock, flags);
-
/* Pack USB load in ALSA ring buffer */
pending = runtime->dma_bytes - hw_ptr;
@@ -166,12 +160,10 @@ static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req)
}
}
- spin_lock_irqsave(&prm->lock, flags);
/* update hw_ptr after data is copied to memory */
prm->hw_ptr = (hw_ptr + req->actual) % runtime->dma_bytes;
hw_ptr = prm->hw_ptr;
- spin_unlock_irqrestore(&prm->lock, flags);
- snd_pcm_stream_unlock_irqrestore(substream, flags2);
+ snd_pcm_stream_unlock(substream);
if ((hw_ptr % snd_pcm_lib_period_bytes(substream)) < req->actual)
snd_pcm_period_elapsed(substream);
@@ -187,7 +179,6 @@ static int uac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
struct uac_rtd_params *prm;
struct g_audio *audio_dev;
struct uac_params *params;
- unsigned long flags;
int err = 0;
audio_dev = uac->audio_dev;
@@ -198,8 +189,6 @@ static int uac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
else
prm = &uac->c_prm;
- spin_lock_irqsave(&prm->lock, flags);
-
/* Reset */
prm->hw_ptr = 0;
@@ -216,8 +205,6 @@ static int uac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
err = -EINVAL;
}
- spin_unlock_irqrestore(&prm->lock, flags);
-
/* Clear buffer after Play stops */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss)
memset(prm->rbuf, 0, prm->max_psize * params->req_number);
@@ -280,14 +267,12 @@ static int uac_pcm_open(struct snd_pcm_substream *substream)
runtime->hw = uac_pcm_hardware;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- spin_lock_init(&uac->p_prm.lock);
runtime->hw.rate_min = p_srate;
runtime->hw.formats = uac_ssize_to_fmt(p_ssize);
runtime->hw.channels_min = num_channels(p_chmask);
runtime->hw.period_bytes_min = 2 * uac->p_prm.max_psize
/ runtime->hw.periods_min;
} else {
- spin_lock_init(&uac->c_prm.lock);
runtime->hw.rate_min = c_srate;
runtime->hw.formats = uac_ssize_to_fmt(c_ssize);
runtime->hw.channels_min = num_channels(c_chmask);
--
2.29.2
With commit 913e4a90b6f9 ("usb: gadget: f_uac2: finalize wMaxPacketSize according to bandwidth")
wMaxPacketSize is computed dynamically but the value is never reset.
Because of this, the actual maximum packet size can only decrease each time
the audio gadget is instantiated.
Reset the endpoint maximum packet size and mark wMaxPacketSize as dynamic
to solve the problem.
Fixes: 913e4a90b6f9 ("usb: gadget: f_uac2: finalize wMaxPacketSize according to bandwidth")
Signed-off-by: Jerome Brunet <[email protected]>
---
drivers/usb/gadget/function/f_uac2.c | 69 ++++++++++++++++++++++------
1 file changed, 55 insertions(+), 14 deletions(-)
diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index 3633df6d7610..5d960b6603b6 100644
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -271,7 +271,7 @@ static struct usb_endpoint_descriptor fs_epout_desc = {
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
- .wMaxPacketSize = cpu_to_le16(1023),
+ /* .wMaxPacketSize = DYNAMIC */
.bInterval = 1,
};
@@ -280,7 +280,7 @@ static struct usb_endpoint_descriptor hs_epout_desc = {
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
- .wMaxPacketSize = cpu_to_le16(1024),
+ /* .wMaxPacketSize = DYNAMIC */
.bInterval = 4,
};
@@ -348,7 +348,7 @@ static struct usb_endpoint_descriptor fs_epin_desc = {
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
- .wMaxPacketSize = cpu_to_le16(1023),
+ /* .wMaxPacketSize = DYNAMIC */
.bInterval = 1,
};
@@ -357,7 +357,7 @@ static struct usb_endpoint_descriptor hs_epin_desc = {
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
- .wMaxPacketSize = cpu_to_le16(1024),
+ /* .wMaxPacketSize = DYNAMIC */
.bInterval = 4,
};
@@ -444,12 +444,28 @@ struct cntrl_range_lay3 {
__le32 dRES;
} __packed;
-static void set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
+static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
struct usb_endpoint_descriptor *ep_desc,
- unsigned int factor, bool is_playback)
+ enum usb_device_speed speed, bool is_playback)
{
int chmask, srate, ssize;
- u16 max_packet_size;
+ u16 max_size_bw, max_size_ep;
+ unsigned int factor;
+
+ switch (speed) {
+ case USB_SPEED_FULL:
+ max_size_ep = 1023;
+ factor = 1000;
+ break;
+
+ case USB_SPEED_HIGH:
+ max_size_ep = 1024;
+ factor = 8000;
+ break;
+
+ default:
+ return -EINVAL;
+ }
if (is_playback) {
chmask = uac2_opts->p_chmask;
@@ -461,10 +477,12 @@ static void set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
ssize = uac2_opts->c_ssize;
}
- max_packet_size = num_channels(chmask) * ssize *
+ max_size_bw = num_channels(chmask) * ssize *
DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1)));
- ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_packet_size,
- le16_to_cpu(ep_desc->wMaxPacketSize)));
+ ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_size_bw,
+ max_size_ep));
+
+ return 0;
}
/* Use macro to overcome line length limitation */
@@ -670,10 +688,33 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
}
/* Calculate wMaxPacketSize according to audio bandwidth */
- set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000, true);
- set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false);
- set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true);
- set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false);
+ ret = set_ep_max_packet_size(uac2_opts, &fs_epin_desc, USB_SPEED_FULL,
+ true);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return ret;
+ }
+
+ ret = set_ep_max_packet_size(uac2_opts, &fs_epout_desc, USB_SPEED_FULL,
+ false);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return ret;
+ }
+
+ ret = set_ep_max_packet_size(uac2_opts, &hs_epin_desc, USB_SPEED_HIGH,
+ true);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return ret;
+ }
+
+ ret = set_ep_max_packet_size(uac2_opts, &hs_epout_desc, USB_SPEED_HIGH,
+ false);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return ret;
+ }
if (EPOUT_EN(uac2_opts)) {
agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
--
2.29.2
Factorize format related code common to the capture and playback path.
Signed-off-by: Jerome Brunet <[email protected]>
---
drivers/usb/gadget/function/u_audio.c | 43 +++++++++++++--------------
1 file changed, 21 insertions(+), 22 deletions(-)
diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
index 71dd9f16c246..2f69bd572ed7 100644
--- a/drivers/usb/gadget/function/u_audio.c
+++ b/drivers/usb/gadget/function/u_audio.c
@@ -244,6 +244,25 @@ static snd_pcm_uframes_t uac_pcm_pointer(struct snd_pcm_substream *substream)
return bytes_to_frames(substream->runtime, prm->hw_ptr);
}
+static unsigned long uac_ssize_to_fmt(int ssize)
+{
+ unsigned long ret;
+
+ switch (ssize) {
+ case 3:
+ ret = SNDRV_PCM_FMTBIT_S24_3LE;
+ break;
+ case 4:
+ ret = SNDRV_PCM_FMTBIT_S32_LE;
+ break;
+ default:
+ ret = SNDRV_PCM_FMTBIT_S16_LE;
+ break;
+ }
+
+ return ret;
+}
+
static int uac_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
@@ -269,34 +288,14 @@ static int uac_pcm_open(struct snd_pcm_substream *substream)
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
spin_lock_init(&uac->p_prm.lock);
runtime->hw.rate_min = p_srate;
- switch (p_ssize) {
- case 3:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
- break;
- case 4:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
- break;
- default:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
- break;
- }
+ runtime->hw.formats = uac_ssize_to_fmt(p_ssize);
runtime->hw.channels_min = num_channels(p_chmask);
runtime->hw.period_bytes_min = 2 * uac->p_prm.max_psize
/ runtime->hw.periods_min;
} else {
spin_lock_init(&uac->c_prm.lock);
runtime->hw.rate_min = c_srate;
- switch (c_ssize) {
- case 3:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
- break;
- case 4:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
- break;
- default:
- runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
- break;
- }
+ runtime->hw.formats = uac_ssize_to_fmt(c_ssize);
runtime->hw.channels_min = num_channels(c_chmask);
runtime->hw.period_bytes_min = 2 * uac->c_prm.max_psize
/ runtime->hw.periods_min;
--
2.29.2