Re: [PATCH v2 6/7] usb: cdns3-ti: signal reset-on-resume to xHCI for J7200 platform

[Théo Lebrun]

Hello,

On Tue Nov 21, 2023 at 5:53 PM CET, Roger Quadros wrote:
> On 20/11/2023 19:06, Théo Lebrun wrote:
> > Pass CDNS3_RESET_ON_RESUME as platform data to cdns3 host role. It will
> > in turn pass it down to xHCI platform data as XHCI_RESET_ON_RESUME.
> > 
> > Avoid this warning on resume:
> > 
> >   [   16.017462] xhci-hcd xhci-hcd.1.auto: xHC error in resume, USBSTS 0x401, Reinit
> > 
> > When used, remote wakeup is not expected to work.
> > 
> > Only focus J7200 as other SoC are untested.
> > 
> > Signed-off-by: Théo Lebrun <theo.lebrun@xxxxxxxxxxx>
> > ---
> >  drivers/usb/cdns3/cdns3-ti.c | 19 +++++++++++++++++--
> >  1 file changed, 17 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c
> > index 84f93c2fcd5c..7d56a1acbc54 100644
> > --- a/drivers/usb/cdns3/cdns3-ti.c
> > +++ b/drivers/usb/cdns3/cdns3-ti.c
> > @@ -16,6 +16,7 @@
> >  #include <linux/of_platform.h>
> >  #include <linux/pm_runtime.h>
> >  #include <linux/property.h>
> > +#include "core.h"
> >  
> >  /* USB Wrapper register offsets */
> >  #define USBSS_PID		0x0
> > @@ -128,6 +129,7 @@ static int cdns_ti_probe(struct platform_device *pdev)
> >  {
> >  	struct device *dev = &pdev->dev;
> >  	struct device_node *node = pdev->dev.of_node;
> > +	const struct of_dev_auxdata *auxdata;
> >  	struct cdns_ti *data;
> >  	unsigned long rate;
> >  	int error, i;
> > @@ -177,7 +179,8 @@ static int cdns_ti_probe(struct platform_device *pdev)
> >  
> >  	cdns_ti_init_hw(data);
> >  
> > -	error = of_platform_populate(node, NULL, NULL, dev);
> > +	auxdata = of_device_get_match_data(dev);
> > +	error = of_platform_populate(node, NULL, auxdata, dev);
> >  	if (error) {
> >  		dev_err(dev, "failed to create children: %d\n", error);
> >  		return error;
> > @@ -222,8 +225,20 @@ static const struct dev_pm_ops cdns_ti_pm_ops = {
> >  
> >  #endif /* CONFIG_PM */
> >  
> > +static struct cdns3_platform_data cdns_ti_j7200_pdata = {
> > +	.quirks = CDNS3_RESET_ON_RESUME,
> > +};
>
> We will need to introduce a new data structure "struct cdns_ti_platform_data"
> and add platform specific details like "reset_on_resume" to it.
> This is to address what Krzysztof pointed to in patch 4.

Yes I've got it locally following Krzysztof's review. Below my signature
is a sneak peak as I'll wait a bit more before a V3. First we implement
resume behavior in the wrapper driver using match data then we add
auxdata passed to the subdevices.

Regards,

--
Théo Lebrun, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com


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