On 20-11-24 14:22:25, Roger Quadros wrote:
> Peter,
>
> On 24/11/2020 13:47, Peter Chen wrote:
> > On 20-11-24 12:33:34, Roger Quadros wrote:
> > > > > >
> > > > > > I am sorry about that. Do you use role switch /sys entry, if you have
> > > > > > used, I prefer using "usb-role-switch" property at dts to judge if SoC
> > > > > > OTG signals or external signals for role switch. If you have not used
> > > > > > it, I prefer only setting cdns->role_sw for role switch use cases.
> > > > > >
> > > > >
> > > > > We use both hardware role switch and /sys entries for manually forcing a
> > > > > certain role.
> > > > >
> > > > > We do not set any "usb-role-switch" property at DTS.
> > > > >
> > > > > Currently cdns->role_sw is being always set by driver irrespective of any DT
> > > > > property, so this patch is clearly wrong and needs to be reverted.
> > > > >
> > > > > What do you think?
> > > > >
> > > >
> > > > Could you accept below fix?
> > > >
> > > > diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
> > > > index 2e469139769f..fdd52e87a7b2 100644
> > > > --- a/drivers/usb/cdns3/core.c
> > > > +++ b/drivers/usb/cdns3/core.c
> > > > @@ -280,8 +280,8 @@ int cdns3_hw_role_switch(struct cdns3 *cdns)
> > > > enum usb_role real_role, current_role;
> > > > int ret = 0;
> > > >
> > > > - /* Depends on role switch class */
> > > > - if (cdns->role_sw)
> > > > + /* quit if switch role through external signals */
> > > > + if (device_property_read_bool(cdns->dev, "usb-role-switch"))
> > > > return 0;
> > > >
> > > > pm_runtime_get_sync(cdns->dev);
> > >
> > > Although this will fix the issue I don't think this is making the driver to behave
> > > as expected with usb-role-switch property.
> > >
> > > Now, even if usb-role-switch property is not present the driver will still register
> > > the role switch driver.
> > >
> > > I think we need to register the role switch driver only if usb-role-switch property
> > > is present. We would also need to set the default role if role-switch-default-mode is present.
> > >
> > > How about the following? It still doesn't handle role-switch-default-mode property though.
> > >
> >
> > Roger, you said you also use /sys entries (I suppose it means through role
> > switch class) to do role switch, with your change, there will be no /sys
> > entry for role switch.
>
> Sorry for the confusion. Although we do need both features (SW role switch + HW role switch)
> I don't think it is required to operate simultaneously. If users need SW control they can set the DT flag.
>
I see. I prefer embracing all things related to role switch under the
firmware entry condition. Besides, I find another issue that devm_request_irq
for wakeup_irq does not call usb_role_switch_unregister if it has
failed. So, probably, two patches are needed. I am OK you send the
patches to fix both.
diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
index 2e469139769f..fc6a8152406c 100644
--- a/drivers/usb/cdns3/core.c
+++ b/drivers/usb/cdns3/core.c
@@ -427,7 +427,6 @@ static irqreturn_t cdns3_wakeup_irq(int irq, void *data)
*/
static int cdns3_probe(struct platform_device *pdev)
{
- struct usb_role_switch_desc sw_desc = { };
struct device *dev = &pdev->dev;
struct resource *res;
struct cdns3 *cdns;
@@ -529,18 +528,21 @@ static int cdns3_probe(struct platform_device *pdev)
if (ret)
goto err2;
- sw_desc.set = cdns3_role_set;
- sw_desc.get = cdns3_role_get;
- sw_desc.allow_userspace_control = true;
- sw_desc.driver_data = cdns;
- if (device_property_read_bool(dev, "usb-role-switch"))
+ if (device_property_read_bool(dev, "usb-role-switch")) {
+ struct usb_role_switch_desc sw_desc = { };
+
+ sw_desc.set = cdns3_role_set;
+ sw_desc.get = cdns3_role_get;
+ sw_desc.allow_userspace_control = true;
+ sw_desc.driver_data = cdns;
sw_desc.fwnode = dev->fwnode;
- cdns->role_sw = usb_role_switch_register(dev, &sw_desc);
- if (IS_ERR(cdns->role_sw)) {
- ret = PTR_ERR(cdns->role_sw);
- dev_warn(dev, "Unable to register Role Switch\n");
- goto err3;
+ cdns->role_sw = usb_role_switch_register(dev, &sw_desc);
+ if (IS_ERR(cdns->role_sw)) {
+ ret = PTR_ERR(cdns->role_sw);
+ dev_warn(dev, "Unable to register Role Switch\n");
+ goto err3;
+ }
}
if (cdns->wakeup_irq) {
@@ -583,7 +585,8 @@ static int cdns3_probe(struct platform_device *pdev)
return 0;
err4:
cdns3_drd_exit(cdns);
- usb_role_switch_unregister(cdns->role_sw);
+ if (cdns->role_sw)
+ usb_role_switch_unregister(cdns->role_sw);
err3:
set_phy_power_off(cdns);
err2:
--
Thanks,
Peter Chen
