linux-kernel - RE: [PATCH v2 0/2] usb: dwc2: fix USB peripheral role in dual-role mode on PX30

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Date:   Tue, 20 Dec 2022 06:02:47 +0000
From:   Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
To:     Quentin Schulz <foss+kernel@...il.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bin Yang <yangbin@...k-chips.com>,
        Quentin Schulz <quentin.schulz@...obroma-systems.com>
Subject: RE: [PATCH v2 0/2] usb: dwc2: fix USB peripheral role in dual-role
 mode on PX30

Hi Quentin,

On 12/16/2022 8:29 PM, Quentin Schulz <foss+kernel@...il.net> wrote:
>From: Quentin Schulz <foss+kernel@...il.net>
>Sent: Friday, December 16, 2022 8:29 PM
>To: Minas Harutyunyan <hminas@...opsys.com>; Greg Kroah-Hartman
><gregkh@...uxfoundation.org>
>Cc: Quentin Schulz <foss+kernel@...il.net>; linux-usb@...r.kernel.org;
>linux-kernel@...r.kernel.org; Bin Yang <yangbin@...k-chips.com>; Quentin
>Schulz <quentin.schulz@...obroma-systems.com>
>Subject: [PATCH v2 0/2] usb: dwc2: fix USB peripheral role in dual-role mode
>on PX30
>
>On Theobroma Ringneck SoM, USB peripheral role when in dual-role mode does
>not work and displays the following error message:
>dwc2 ff300000.usb: dwc2_core_reset: HANG! Soft Reset timeout GRSTCTL_CSFTRST
>

This mostly happen if PHY not initialized correctly.

>The USB sniffer shows nothing and dumping the host registers is stuck on
>HCDMA(0) register.
>
>Note that for some reason it works "fine" on PX30-EVB (there's another issue
>but not related to/fixed in this patch series).
>
>Since there's no documentation available for this IP, this patch series is
>basically just slightly adapted downstream BSP vendor kernel patches and I
>cannot unfortunately give more information than what I have.
>
>This patch series was tested on Theobroma Ringneck SoM on Haikou devkit and
>PX30 EVB. It fixes Ringneck support and does not break PX30-EVB's.
>
>For reference, the content of those commits can be found in tag linux-5.10-
>gen-rkr1, and the following commits have been used:
>964d50060bf53a8defd1fc561b9261424f25ddad
>ad81c375602819a538ad68d979906c05663046e2
>6e6adab8f735bc4fe27a67bdc3144d8fa89250d4
>7c3a4e60247fd7f7b04d95d15cb12c63a5c20408
>
>Note that Rockchip kernel called a slightly different implementation of
>__dwc2_lowlevel_hw_enable instead of dwc2_lowlevel_hw_enable but it seemed
>more right to me to call dwc2_lowlevel_hw_enable as done for the forced
>peripheral mode.
>
>Note that it is still not flawlessly working but the support is improved
>(somewhat working vs not working at all).

If "still not flawlessly working" maybe required deeper investigate issue
and submit "flawlessly working" patch.

Thanks,
Minas

>
>To: Minas Harutyunyan <hminas@...opsys.com>
>To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>Cc: linux-usb@...r.kernel.org
>Cc: linux-kernel@...r.kernel.org
>Cc: Bin Yang <yangbin@...k-chips.com>
>Signed-off-by: Quentin Schulz <quentin.schulz@...obroma-systems.com>
>---
>Changes in v2:
>- add "shadow" variable for HCD skip_phy_initialization so that it can be
>  configured on a per-platform basis,
>- Patch 1 and Patch 2 of the v1 are already in linux-next next-20221216, so
>removed from this series,
>- Link to v1:
>https://urldefense.com/v3/__https://lore.kernel.org/r/20221206-dwc2-gadget-
>dual-role-v1-0-36515e1092cd@...obroma-
>systems.com__;!!A4F2R9G_pg!abD6i25j11WuiZxeHgqSXPLLwpjHNNNR2b18aw-
>lsRUROS_fdnLEnEw-t4kodoTU8qnqXrzkT2N_9w7e6L-q$
>
>---
>Quentin Schulz (2):
>      usb: dwc2: allow platforms to prevent core phy initialisation
>      usb: dwc2: prevent core PHY initialization on Rockchip
>
> drivers/usb/dwc2/core.h   | 6 ++++++
> drivers/usb/dwc2/hcd.c    | 2 ++
> drivers/usb/dwc2/params.c | 1 +
> 3 files changed, 9 insertions(+)
>---
>base-commit: ca39c4daa6f7f770b1329ffb46f1e4a6bcc3f291
>change-id: 20221206-dwc2-gadget-dual-role-aac67e6d42fd
>
>Best regards,
>--
>Quentin Schulz <quentin.schulz@...obroma-systems.com>