Re: usb: gadget: dwc2: not getting audio data

[Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>]

Hi Palak,

On 12/8/2022 8:30 PM, Palak SHAH wrote:
> Hi Minas,
> 
> We are using an Altera Cyclone V SoC FPGA on our board with linux kernel 
> 5.4.80 and enabling the USB gadget for HID (keyboard and mouse) and 
> audio (UAC1). The USB will always be configured for USB gadget (and 
> never host).
> 
> When the USB gadget is configured for audio (speaker), we are seeing 
> that the USB gadget DWC2 driver is getting stuck and not getting the 
> transfers completed. The USB speaker is configured for 44.1KHz, 2 channel.
> 

Could you please apply below patch, test and send debug log.

index 8b15742d9e8a..3c03431023a8 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -2218,6 +2218,8 @@ static void 
dwc2_gadget_complete_isoc_request_ddma(struct dwc2_hsotg_ep *hs_ep)

                 dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0);

+               dev_dbg(hsotg->dev, "%s: compl_desc # %d\n", __func__, 
hs_ep->compl_desc);
+
                 hs_ep->compl_desc++;
                 if (hs_ep->compl_desc > (MAX_DMA_DESC_NUM_HS_ISOC - 1))
                         hs_ep->compl_desc = 0;
@@ -2892,6 +2894,9 @@ static void 
dwc2_gadget_handle_out_token_ep_disabled(struct dwc2_hsotg_ep *ep)
                 return;

         if (using_desc_dma(hsotg)) {
+
+               dev_dbg(hsotg->dev, "%s: target_frame = 0x%08x\n", 
__func__, ep->target_frame);
+
                 if (ep->target_frame == TARGET_FRAME_INITIAL) {
                         /* Start first ISO Out */
                         ep->target_frame = hsotg->frame_number;


BTW, correct subject should be follow:

usb: dwc2: gadget: not getting....

Thanks,
Minas