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usb: dwc2: drd: reset current session before setting the new one

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[ Upstream commit 1ad707f559f7cb12c64f3d7cb37f0b1ea27c1058 ]

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: 17f934024e ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Amelie Delaunay 2021-10-05 11:53:05 +02:00 committed by Greg Kroah-Hartman
parent fc86da757d
commit 31e7a836e2
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/dwc2/drd.c
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@ -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