This is a note to let you know that I've just added the patch titled
usb: dwc2: fix STM ID/VBUS detection startup delay in dwc2_driver_probe
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-dwc2-fix-stm-id-vbus-detection-startup-delay-in-dwc2_driver_probe.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fac6bf87c55f7f0733efb0375565fb6a50cf2caf Mon Sep 17 00:00:00 2001
From: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
Date: Tue, 7 Dec 2021 13:45:10 +0100
Subject: usb: dwc2: fix STM ID/VBUS detection startup delay in dwc2_driver_probe
From: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
commit fac6bf87c55f7f0733efb0375565fb6a50cf2caf upstream.
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")
Cc: stable <stable@xxxxxxxxxxxxxxx>
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@xxxxxxxxxxxx>
Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20211207124510.268841-1-amelie.delaunay@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc2/platform.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -575,6 +575,9 @@ static int dwc2_driver_probe(struct plat
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);
Patches currently in stable-queue which might be from amelie.delaunay@xxxxxxxxxxx are
queue-5.15/usb-dwc2-fix-stm-id-vbus-detection-startup-delay-in-dwc2_driver_probe.patch
