| Message ID | 20211207124510.268841-1-amelie.delaunay@foss.st.com |
|---|---|
| State | New |
| Headers | show |
| Series | [1/1] usb: dwc2: fix STM ID/VBUS detection startup delay in dwc2_driver_probe | expand |
On 12/7/2021 4:45 PM, Amelie Delaunay wrote: > When activate_stm_id_vb_detection is enabled, ID and Vbus detection relies > on sensing comparators. This detection needs time to stabilize. > A delay was already applied in dwc2_resume() when reactivating the > detection, but it wasn't done in dwc2_probe(). > This patch adds delay after enabling STM ID/VBUS detection. Then, ID state > is good when initializing gadget and host, and avoid to get a wrong > Connector ID Status Change interrupt. > > Fixes: a415083a11cc ("usb: dwc2: add support for STM32MP15 SoCs USB OTG HS and FS") > Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com> Acked-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com> > --- > drivers/usb/dwc2/platform.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c > index a1feaa09be57..55d7fca6f95c 100644 > --- a/drivers/usb/dwc2/platform.c > +++ b/drivers/usb/dwc2/platform.c > @@ -555,6 +555,9 @@ static int dwc2_driver_probe(struct platform_device *dev) > ggpio |= GGPIO_STM32_OTG_GCCFG_IDEN; > ggpio |= GGPIO_STM32_OTG_GCCFG_VBDEN; > dwc2_writel(hsotg, ggpio, GGPIO); > + > + /* ID/VBUS detection startup time */ > + usleep_range(5000, 7000); > } > > retval = dwc2_drd_init(hsotg);
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c index a1feaa09be57..55d7fca6f95c 100644 --- a/drivers/usb/dwc2/platform.c +++ b/drivers/usb/dwc2/platform.c @@ -555,6 +555,9 @@ static int dwc2_driver_probe(struct platform_device *dev) ggpio |= GGPIO_STM32_OTG_GCCFG_IDEN; ggpio |= GGPIO_STM32_OTG_GCCFG_VBDEN; dwc2_writel(hsotg, ggpio, GGPIO); + + /* ID/VBUS detection startup time */ + usleep_range(5000, 7000); } retval = dwc2_drd_init(hsotg);
When activate_stm_id_vb_detection is enabled, ID and Vbus detection relies on sensing comparators. This detection needs time to stabilize. A delay was already applied in dwc2_resume() when reactivating the detection, but it wasn't done in dwc2_probe(). This patch adds delay after enabling STM ID/VBUS detection. Then, ID state is good when initializing gadget and host, and avoid to get a wrong Connector ID Status Change interrupt. Fixes: a415083a11cc ("usb: dwc2: add support for STM32MP15 SoCs USB OTG HS and FS") Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com> --- drivers/usb/dwc2/platform.c | 3 +++ 1 file changed, 3 insertions(+)