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

Palak SHAH
2023-01-06T21:37:13Z

Hi Minas,
Sorry for the delay in replying to the last post.

To answer your question, I do not stop the host from playing the audio.

In terms of debug messages, what messages should I look into, to see the time gaps? We want to dig dipper into this and need more clarification on what I should be looking at?

Thanks,
Palak

-----Original Message-----
From: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Sent: Friday, December 16, 2022 2:03 AM
To: Palak SHAH <palak.shah@raritan.com>; Maynard CABIENTE <maynard.cabiente@raritan.com>
Cc: linux-usb@vger.kernel.org
Subject: RE: usb: gadget: dwc2: not getting audio data

Hi Palak,

On 12/16/2022 1:16 AM, Palak SHAH wrote:
>From: Palak SHAH <palak.shah@raritan.com>
>Sent: Friday, December 16, 2022 1:16 AM
>To: Minas Harutyunyan <hminas@synopsys.com>; Maynard CABIENTE
><maynard.cabiente@raritan.com>
>Cc: linux-usb@vger.kernel.org
>Subject: RE: usb: gadget: dwc2: not getting audio data
>
>Hi Minas,
>Please find attached the logs I got after I applied your latest patch.
>
>Thanks,
>Palak
>

In last log I don't see any obvious issue besides suspicious 6 second time gap after last ep1out transfer complete and control requests from host on getting string device descriptors. Could you please explain why this time gap happen? Do you stop playing from host side? If no, then it's looks like your platform issue - interrupts from core doesn't achieve driver.
Driver is interrupt driven SW and can't work correctly if interrupts not asserted or not passed to driver.

Same type of time gaps (not asserted interrupts) seen in previous logs too:
1. KX4-101_2022-12-06T16_00_38.039Z.txt, 2 seconds:

[ 182.154799] dwc2 ffb40000.usb: ureq->length:6 ureq->actual:0 [ 184.940357] dwc2 ffb40000.usb: dwc2_hsotg_irq: daint=00020000

2. KX4-101_2022-12-09T16_41_45.579Z.txt, 3 seconds:

[ 2847.681630] dwc2 ffb40000.usb: ep1out: req 307d375f: 200@3a5638aa, noi=0, zero=0, snok=0 [ 2850.442440] dwc2 ffb40000.usb: dwc2_hsotg_irq: 0428c0b8 00080000 (d08c3c44) retry 8

3. KX4-101_2022-12-12T16_46_16.365Z.txt, 7 seconds:

[ 504.335408] dwc2 ffb40000.usb: dwc2_gadget_complete_isoc_request_ddma: compl_desc # 18 [ 511.068368] dwc2 ffb40000.usb: dwc2_hsotg_irq: 0428c038 00080000 (d08c3cc4) retry 8

4. KX4-101_2022-12-15T21_14_35.964Z.txt, 6 seconds:

[ 83.796195] dwc2 ffb40000.usb: dwc2_gadget_complete_isoc_request_ddma: compl_desc # 12
[ 89.817700] dwc2 ffb40000.usb: dwc2_hsotg_start_req: 0ed84000 pad => 0x00000b14

I would recommend you to investigate your platform to find out reason of these time gaps.

Thanks,
Minas

________________________________

Ce message, ainsi que tous les fichiers joints à ce message, peuvent contenir des informations sensibles et/ ou confidentielles ne devant pas être divulguées. Si vous n'êtes pas le destinataire de ce message (ou que vous recevez ce message par erreur), nous vous remercions de le notifier immédiatement à son expéditeur, et de détruire ce message. Toute copie, divulgation, modification, utilisation ou diffusion, non autorisée, directe ou indirecte, de tout ou partie de ce message, est strictement interdite.

This e-mail, and any document attached hereby, may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized, direct or indirect, copying, disclosure, distribution or other use of the material or parts thereof is strictly forbidden.