linux-kernel - Re: commit 3497b9a5 (usb: dwc3: add power down scale setting) breaks imx8mp

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Date:   Mon, 9 Jan 2023 09:46:54 +0100
From:   Rasmus Villemoes <rasmus.villemoes@...vas.dk>
To:     Jun Li <jun.li@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Shawn Guo <shawnguo@...nel.org>, Arnd Bergmann <arnd@...db.de>
Subject: Re: commit 3497b9a5 (usb: dwc3: add power down scale setting) breaks
 imx8mp

On 06/01/2023 14.35, Jun Li wrote:
> 
> 
>> -----Original Message-----
>> From: Rasmus Villemoes <rasmus.villemoes@...vas.dk>
>> Sent: Friday, January 6, 2023 7:55 PM
>> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; Jun Li
>> <jun.li@....com>

>> Li Jun, please either revert 3497b9a5 or figure out if imx8mp.dtsi is broken
>> and needs a fix similar to 74bd5951dd3.
> 
> iMX8MP suspend clock(with name IMX8MP_CLK_USB_ROOT) was 32K when 3497b9a5
> was merged, a later iMX8MP clock driver patch change the clock to be root
> clock gate(actually this is a shared clock gate for both suspend and root
> clock), so break the iMX8MP USB as you are seeing, a fix patch set already
> addressed this issue, please check and apply below 3 patches:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/include/dt-bindings/clock/imx8mp-clock.h?id=5c1f7f1090947d494c30042123e0ec846f696336
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/clk/imx/clk-imx8mp.c?id=ed1f4ccfe947a3e1018a3bd7325134574c7ff9b3
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/arch/arm64/boot/dts/freescale/imx8mp.dtsi?id=8a1ed98fe0f2e7669f0409de0f46f317b275f8be

Thanks, I see that the first two are in 6.2-rc1 and have already been
picked up in 6.0.y and 6.1.y. The last is not yet in mainline and thus
not eligible for -stable, but does seem to be included in Shawn's PR

https://lore.kernel.org/all/20230102132016.GA10699@T480/

so I assume that it will land shortly.

Rasmus