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BACKPORT: FROMGIT: usb: gadget: f_uac2: Add missing companion descriptor for feedback EP

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The f_uac2 function fails to enumerate when connected in SuperSpeed
due to the feedback endpoint missing the companion descriptor.
Add a new ss_epin_fback_desc_comp descriptor and append it behind the
ss_epin_fback_desc both in the static definition of the ss_audio_desc
structure as well as its dynamic construction in setup_headers().

Fixes: 24f779dac8f3 ("usb: gadget: f_uac2/u_audio: add feedback endpoint support")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Link: https://lore.kernel.org/r/20210909174811.12534-2-jackp@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 199044440
Change-Id: I8ae495878f38ec733af4ddf61a3f5d57f5cd5a80
(cherry picked from commit 595091a1426a3b2625dad322f69fe569dc9d8943
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-linus)
[jackp: Resolved merge conflict in f_uac2.c due to added code in upstream]
Signed-off-by: Jack Pham <jackp@codeaurora.org>
This commit is contained in:
Jack Pham
2021-09-09 10:48:10 -07:00
committed by Greg Kroah-Hartman
parent 6773d5cd77
commit d9e738916e
1 changed files with 15 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/usb/gadget/function/f_uac2.c
View File

@@ -348,6 +348,14 @@ static struct usb_endpoint_descriptor ss_epin_fback_desc = {
.bInterval = 4,
};
static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = {
.bLength = sizeof(ss_epin_fback_desc_comp),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 0,
.bmAttributes = 0,
.wBytesPerInterval = cpu_to_le16(4),
};
/* Audio Streaming IN Interface - Alt0 */
static struct usb_interface_descriptor std_as_in_if0_desc = {
@@ -527,6 +535,7 @@ static struct usb_descriptor_header *ss_audio_desc[] = {
(struct usb_descriptor_header *)&ss_epout_desc_comp,
(struct usb_descriptor_header *)&as_iso_out_desc,
(struct usb_descriptor_header *)&ss_epin_fback_desc,
(struct usb_descriptor_header *)&ss_epin_fback_desc_comp,
(struct usb_descriptor_header *)&std_as_in_if0_desc,
(struct usb_descriptor_header *)&std_as_in_if1_desc,
@@ -610,6 +619,7 @@ 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_endpoint_descriptor *epout_desc;
struct usb_endpoint_descriptor *epin_desc;
struct usb_endpoint_descriptor *epin_fback_desc;
@@ -632,6 +642,7 @@ static void setup_headers(struct f_uac2_opts *opts,
epout_desc_comp = &ss_epout_desc_comp;
epin_desc_comp = &ss_epin_desc_comp;
epin_fback_desc = &ss_epin_fback_desc;
epin_fback_desc_comp = &ss_epin_fback_desc_comp;
}
i = 0;
@@ -660,8 +671,11 @@ static void setup_headers(struct f_uac2_opts *opts,
headers[i++] = USBDHDR(&as_iso_out_desc);
if (EPOUT_FBACK_IN_EN(opts))
if (EPOUT_FBACK_IN_EN(opts)) {
headers[i++] = USBDHDR(epin_fback_desc);
if (epin_fback_desc_comp)
headers[i++] = USBDHDR(epin_fback_desc_comp);
}
}
if (EPIN_EN(opts)) {
headers[i++] = USBDHDR(&std_as_in_if0_desc);