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| author | Amelie Delaunay <amelie.delaunay@foss.st.com> | 2021-10-05 12:53:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-21 13:49:01 +0300 |
| commit | 1ad707f559f7cb12c64f3d7cb37f0b1ea27c1058 (patch) | |
| tree | 2965f905e6f1936d0308ba0d6c8b2202aa8a7275 | |
| parent | 8d387f61b0240854e81450c261beb775065bad5d (diff) | |
| download | linux-1ad707f559f7cb12c64f3d7cb37f0b1ea27c1058.tar.xz | |
usb: dwc2: drd: reset current session before setting the new one
If role is changed without the "none" step, A- and B- valid session could
be set at the same time. It is an issue.
This patch resets A-session if role switch sets B-session, and resets
B-session if role switch sets A-session.
Then, it is possible to change the role without the "none" step.
Fixes: 17f934024e84 ("usb: dwc2: override PHY input signals with usb role switch support")
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20211005095305.66397-4-amelie.delaunay@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/dwc2/drd.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/drd.c b/drivers/usb/dwc2/drd.c index 99672360f34b..aa6eb76f64dd 100644 --- a/drivers/usb/dwc2/drd.c +++ b/drivers/usb/dwc2/drd.c @@ -40,6 +40,7 @@ static int dwc2_ovr_avalid(struct dwc2_hsotg *hsotg, bool valid) (!valid && !(gotgctl & GOTGCTL_ASESVLD))) return -EALREADY; + gotgctl &= ~GOTGCTL_BVALOVAL; if (valid) gotgctl |= GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL; else @@ -58,6 +59,7 @@ static int dwc2_ovr_bvalid(struct dwc2_hsotg *hsotg, bool valid) (!valid && !(gotgctl & GOTGCTL_BSESVLD))) return -EALREADY; + gotgctl &= ~GOTGCTL_AVALOVAL; if (valid) gotgctl |= GOTGCTL_BVALOVAL | GOTGCTL_VBVALOVAL; else |