2022-02-14 09:53:03

by Jing Leng

Subject: [PATCH] usb: gadget: f_uac2: fix superspeed transfer

From: Jing Leng <[email protected]>

ss_ep_int_desc endpoint doesn't have 'SuperSpeed Endpoint
Companion Descriptor', so we should add it.

Signed-off-by: Jing Leng <[email protected]>
---
drivers/usb/gadget/function/f_uac2.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index 097a709549d6..a6fc492f9148 100644
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -282,6 +282,14 @@ static struct usb_endpoint_descriptor ss_ep_int_desc = {
.bInterval = 4,
};

+static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = {
+ .bLength = sizeof(ss_ep_int_desc_comp),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .bMaxBurst = 0,
+ .bmAttributes = 0,
+ .wBytesPerInterval = cpu_to_le16(6),
+};
+
/* Audio Streaming OUT Interface - Alt0 */
static struct usb_interface_descriptor std_as_out_if0_desc = {
.bLength = sizeof std_as_out_if0_desc,
@@ -595,7 +603,8 @@ static struct usb_descriptor_header *ss_audio_desc[] = {
(struct usb_descriptor_header *)&in_feature_unit_desc,
(struct usb_descriptor_header *)&io_out_ot_desc,

- (struct usb_descriptor_header *)&ss_ep_int_desc,
+ (struct usb_descriptor_header *)&ss_ep_int_desc,
+ (struct usb_descriptor_header *)&ss_ep_int_desc_comp,

(struct usb_descriptor_header *)&std_as_out_if0_desc,
(struct usb_descriptor_header *)&std_as_out_if1_desc,
@@ -657,6 +666,7 @@ static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,

case USB_SPEED_HIGH:
case USB_SPEED_SUPER:
+ case USB_SPEED_SUPER_PLUS:
max_size_ep = 1024;
factor = 8000;
break;
@@ -723,6 +733,7 @@ static void setup_headers(struct f_uac2_opts *opts,
struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL;
+ struct usb_ss_ep_comp_descriptor *ep_int_desc_comp = NULL;
struct usb_endpoint_descriptor *epout_desc;
struct usb_endpoint_descriptor *epin_desc;
struct usb_endpoint_descriptor *epin_fback_desc;
@@ -750,6 +761,7 @@ static void setup_headers(struct f_uac2_opts *opts,
epin_fback_desc = &ss_epin_fback_desc;
epin_fback_desc_comp = &ss_epin_fback_desc_comp;
ep_int_desc = &ss_ep_int_desc;
+ ep_int_desc_comp = &ss_ep_int_desc_comp;
}

i = 0;
@@ -778,8 +790,11 @@ static void setup_headers(struct f_uac2_opts *opts,
if (EPOUT_EN(opts))
headers[i++] = USBDHDR(&io_out_ot_desc);

- if (FUOUT_EN(opts) || FUIN_EN(opts))
+ if (FUOUT_EN(opts) || FUIN_EN(opts)) {
headers[i++] = USBDHDR(ep_int_desc);
+ if (ep_int_desc_comp)
+ headers[i++] = USBDHDR(ep_int_desc_comp);
+ }

if (EPOUT_EN(opts)) {
headers[i++] = USBDHDR(&std_as_out_if0_desc);
--
2.17.1

2022-02-14 11:25:37

by Greg KH

Subject: Re: [PATCH] usb: gadget: f_uac2: fix superspeed transfer

On Mon, Feb 14, 2022 at 11:26:06AM +0800, [email protected] wrote:
> From: Jing Leng <[email protected]>
>
> ss_ep_int_desc endpoint doesn't have 'SuperSpeed Endpoint
> Companion Descriptor', so we should add it.

This is not a "fix" but rather a new feature.

Why does this endpoint need this descriptor? We need a lot more
description here please.

>
> Signed-off-by: Jing Leng <[email protected]>
> ---
> drivers/usb/gadget/function/f_uac2.c | 19 +++++++++++++++++--
> 1 file changed, 17 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
> index 097a709549d6..a6fc492f9148 100644
> --- a/drivers/usb/gadget/function/f_uac2.c
> +++ b/drivers/usb/gadget/function/f_uac2.c
> @@ -282,6 +282,14 @@ static struct usb_endpoint_descriptor ss_ep_int_desc = {
> .bInterval = 4,
> };
>
> +static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = {
> + .bLength = sizeof(ss_ep_int_desc_comp),
> + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
> + .bMaxBurst = 0,
> + .bmAttributes = 0,

0 is the default value if it is not defined.

thanks,

greg k-h

2022-02-14 20:07:20

by Jing Leng

Subject: [PATCH v2] usb: gadget: f_uac2: fix superspeed transfer

From: Jing Leng <[email protected]>

On page 362 of the USB3.2 specification (
https://usb.org/sites/default/files/usb_32_20210125.zip),
The 'SuperSpeed Endpoint Companion Descriptor' shall only be returned
by Enhanced SuperSpeed devices that are operating at Gen X speed.
Each endpoint described in an interface is followed by a 'SuperSpeed
Endpoint Companion Descriptor'.

If we use SuperSpeed UDC, host can't recognize the device if endpoint
doesn't have 'SuperSpeed Endpoint Companion Descriptor' followed.

Currently in the uac2 driver code:
1. ss_epout_desc_comp follows ss_epout_desc;
2. ss_epin_fback_desc_comp follows ss_epin_fback_desc;
3. ss_epin_desc_comp follows ss_epin_desc;
4. Only ss_ep_int_desc endpoint doesn't have 'SuperSpeed Endpoint
Companion Descriptor' followed, so we should add it.

Signed-off-by: Jing Leng <[email protected]>
---
drivers/usb/gadget/function/f_uac2.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index 097a709549d6..a6fc492f9148 100644
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -282,6 +282,14 @@ static struct usb_endpoint_descriptor ss_ep_int_desc = {
.bInterval = 4,
};

+static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = {
+ .bLength = sizeof(ss_ep_int_desc_comp),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .bMaxBurst = 0,
+ .bmAttributes = 0,
+ .wBytesPerInterval = cpu_to_le16(6),
+};
+
/* Audio Streaming OUT Interface - Alt0 */
static struct usb_interface_descriptor std_as_out_if0_desc = {
.bLength = sizeof std_as_out_if0_desc,
@@ -595,7 +603,8 @@ static struct usb_descriptor_header *ss_audio_desc[] = {
(struct usb_descriptor_header *)&in_feature_unit_desc,
(struct usb_descriptor_header *)&io_out_ot_desc,

- (struct usb_descriptor_header *)&ss_ep_int_desc,
+ (struct usb_descriptor_header *)&ss_ep_int_desc,
+ (struct usb_descriptor_header *)&ss_ep_int_desc_comp,

(struct usb_descriptor_header *)&std_as_out_if0_desc,
(struct usb_descriptor_header *)&std_as_out_if1_desc,
@@ -657,6 +666,7 @@ static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,

case USB_SPEED_HIGH:
case USB_SPEED_SUPER:
+ case USB_SPEED_SUPER_PLUS:
max_size_ep = 1024;
factor = 8000;
break;
@@ -723,6 +733,7 @@ static void setup_headers(struct f_uac2_opts *opts,
struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL;
+ struct usb_ss_ep_comp_descriptor *ep_int_desc_comp = NULL;
struct usb_endpoint_descriptor *epout_desc;
struct usb_endpoint_descriptor *epin_desc;
struct usb_endpoint_descriptor *epin_fback_desc;
@@ -750,6 +761,7 @@ static void setup_headers(struct f_uac2_opts *opts,
epin_fback_desc = &ss_epin_fback_desc;
epin_fback_desc_comp = &ss_epin_fback_desc_comp;
ep_int_desc = &ss_ep_int_desc;
+ ep_int_desc_comp = &ss_ep_int_desc_comp;
}

i = 0;
@@ -778,8 +790,11 @@ static void setup_headers(struct f_uac2_opts *opts,
if (EPOUT_EN(opts))
headers[i++] = USBDHDR(&io_out_ot_desc);

- if (FUOUT_EN(opts) || FUIN_EN(opts))
+ if (FUOUT_EN(opts) || FUIN_EN(opts)) {
headers[i++] = USBDHDR(ep_int_desc);
+ if (ep_int_desc_comp)
+ headers[i++] = USBDHDR(ep_int_desc_comp);
+ }

if (EPOUT_EN(opts)) {
headers[i++] = USBDHDR(&std_as_out_if0_desc);
--
2.17.1