RE: [PATCH v2 2/3] usb: chipidea: imx: support disabling runtime-pm

[Jun Li]

> -----Original Message-----
> From: Luca Ceresoli <luca.ceresoli@xxxxxxxxxxx>
> Sent: Monday, May 29, 2023 6:18 PM
> To: Jun Li <jun.li@xxxxxxx>
> Cc: Francesco Dolcini <francesco@xxxxxxxxxx>; devicetree@xxxxxxxxxxxxxxx;
> festevam@xxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>;
> linux-kernel@xxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx;
> robh+dt@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx; shawnguo@xxxxxxxxxx;
> Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>; Francesco Dolcini
> <francesco.dolcini@xxxxxxxxxxx>; Xu Yang <xu.yang_2@xxxxxxx>
> Subject: Re: [PATCH v2 2/3] usb: chipidea: imx: support disabling runtime-pm
> 
> Hello Jun,
> 
> On Mon, 8 May 2023 15:17:56 +0200
> Luca Ceresoli <luca.ceresoli@xxxxxxxxxxx> wrote:
> 
> > Hello Jun, Francesco,
> >
> > On Mon, 8 May 2023 13:17:11 +0200
> > Francesco Dolcini <francesco@xxxxxxxxxx> wrote:
> >
> > > On Sat, May 06, 2023 at 09:02:39AM +0000, Jun Li wrote:
> > > > > -----Original Message-----
> > > > > From: Francesco Dolcini <francesco@xxxxxxxxxx>
> > > > > Sent: Friday, May 5, 2023 7:00 PM
> > > > > To: Luca Ceresoli <luca.ceresoli@xxxxxxxxxxx>; Jun Li
> <jun.li@xxxxxxx>
> > > > > Cc: Francesco Dolcini <francesco@xxxxxxxxxx>;
> devicetree@xxxxxxxxxxxxxxx;
> > > > > festevam@xxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx;
> kernel@xxxxxxxxxxxxxx;
> > > > > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; dl-linux-imx
> <linux-imx@xxxxxxx>;
> > > > > linux-kernel@xxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx;
> > > > > peter.chen@xxxxxxx; robh+dt@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx;
> > > > > shawnguo@xxxxxxxxxx; Krzysztof Kozlowski
> <krzysztof.kozlowski@xxxxxxxxxx>;
> > > > > Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>
> > > > > Subject: Re: [PATCH v2 2/3] usb: chipidea: imx: support disabling
> runtime-pm
> > > > >
> > > > > On Fri, May 05, 2023 at 12:06:18PM +0200, Luca Ceresoli wrote:
> > > > > > On Fri, 5 May 2023 09:49:16 +0000
> > > > > > Jun Li <jun.li@xxxxxxx> wrote:
> > > > > > > Is your board design similar like Francesco's as below?
> > > > > >
> > > > > > Possibly, but I'm afraid I can't say: I am using the Toradex Colibri
> > > > > > i.MX6ULL SoM, whose schematics are not public.
> > > > >
> > > > > I can confirm that it's the same.
> > > >
> > > > Thanks Francesco for the confirmation, had a check with design team,
> > > > there is no status bit which can be used to judge the VDD_USB_CAP is
> > > > powered or not, so we have to add a board level dts property to tell
> > > > this usb phy driver to bypass MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS.
> > > >
> > > > Before send a formal patch, I want to confirm this should work for
> your
> > > > HW design, like below simple hack:
> > >
> > > Thanks Li Jun, I tested it with v6.3.1 kernel and it's all good.
> > > I would be happy to test the patch as soon as you send it.
> >
> > Thanks Jun, it works here as well, on 6.1.27!
> 
> Have you managed to make progress on the patch after Francesco's and my
> tests?
> 
> As I see it, a proper fix for mainline could be as simple as a new DT
> property to describe this specific hardware configuration and a patch
> to ignore the flag when the property is present. Is my understanding
> correct?

Yes, your understanding is correct, talked with Xu(in CC), he will take this
soon.

Thanks
Li Jun

> 
> Best regards,
> Luca
> 
> --
> Luca Ceresoli, Bootlin
> Embedded Linux and Kernel engineering
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