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? Best regards, Luca -- Luca Ceresoli, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
