[PATCH v1] HSD #18028953892: usb: xhci-dwc3: Fix USB3.1 controller register access in reset state

[Chong, Teik Heng]

Hi

> -----Original Message-----
> From: Marek Vasut <marex at denx.de>
> Sent: Saturday, 22 July, 2023 4:31 AM
> To: Lim, Jit Loon <jit.loon.lim at intel.com>; u-boot at lists.denx.de
> Cc: Jagan Teki <jagan at amarulasolutions.com>; Simon
> <simon.k.r.goldschmidt at gmail.com>; Chee, Tien Fong
> <tien.fong.chee at intel.com>; Hea, Kok Kiang <kok.kiang.hea at intel.com>;
> Maniyam, Dinesh <dinesh.maniyam at intel.com>; Ng, Boon Khai
> <boon.khai.ng at intel.com>; Yuslaimi, Alif Zakuan
> <alif.zakuan.yuslaimi at intel.com>; Chong, Teik Heng
> <teik.heng.chong at intel.com>; Zamri, Muhammad Hazim Izzat
> <muhammad.hazim.izzat.zamri at intel.com>; Tang, Sieu Mun
> <sieu.mun.tang at intel.com>; Bin Meng <bmeng.cn at gmail.com>; Michal
> Simek <monstr at monstr.eu>; Tom Rini <trini at konsulko.com>; Eugen Hristev
> <eugen.hristev at microchip.com>
> Subject: Re: [PATCH v1] HSD #18028953892: usb: xhci-dwc3: Fix USB3.1
> controller register access in reset state
> 
> On 7/21/23 05:26, Lim, Jit Loon wrote:
> 
> Hi,
> 
> >>> Linux:  (__dwc3_of_simple_teardown)
> >>> https://elixir.bootlin.com/linux/latest/source/drivers/usb/dwc3/dwc3
> >>> -o
> >>> f-simple.c#L98
> >>> U-Boot: (xhci_dwc3_remove)
> >>> https://elixir.bootlin.com/u-boot/latest/source/drivers/usb/host/xhc
> >>> i-
> >>> dwc3.c#L227
> >>>
> >>> So we believed that we can't directly pickup all Linux kernel dwc3
> >>> patches
> >> and merge to U-Boot.
> >>
> >> If you were to sync the driver from Linux to U-Boot, then the same
> >> sequence as Linux uses would be automatically used too, right ?
> >>
> >> Sorry for the abysmal delay in my reply.
> >
> > Are we saying that we shall port/use Linux driver in U-Boot and abandon
> the existing USB host driver in U-Boot?
> 
> No, the existing driver in U-Boot is a port of the Linux driver, it is just
> outdated. I am saying, just pick the missing patches from Linux and add them
> to U-Boot, so the two drivers are in sync.

We do not see a DWC3 host driver under usb host folder in Linux https://elixir.bootlin.com/linux/latest/source/drivers/usb/host. Would you mind to tell us which DWC3 host driver we should use in usb host folder? Then, we can pick up the missing patches