Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.15 15/46] usb: dwc2: gadget: remove D+ pull-up while no vbus with usb-role-switch | Date | Sun, 14 Aug 2022 11:32:16 -0400 |
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From: Amelie Delaunay <amelie.delaunay@foss.st.com>
[ Upstream commit db638c6500abaffb8f7770b2a69c40d003d54ae1 ]
When using usb-role-switch, D+ pull-up is set as soon as DTCL_SFTDISCON is cleared, whatever the vbus valid signal state is. The pull-up should not be set when vbus isn't present (this is determined by the drd controller).
This patch ensures that B-Session (so Peripheral role + vbus valid signal) is valid before clearing the DCTL_SFTDISCON bit when role switch is used. Keep original behavior when usb-role-switch isn't used.
Acked-by: Minas Harutyunyan <hminas@synopsys.com> Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> Link: https://lore.kernel.org/r/20220622160717.314580-1-fabrice.gasnier@foss.st.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/usb/dwc2/gadget.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index e1cebf581a4a..519bb82b00e8 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -3594,7 +3594,8 @@ void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg) void dwc2_hsotg_core_connect(struct dwc2_hsotg *hsotg) { /* remove the soft-disconnect and let's go */ - dwc2_clear_bit(hsotg, DCTL, DCTL_SFTDISCON); + if (!hsotg->role_sw || (dwc2_readl(hsotg, GOTGCTL) & GOTGCTL_BSESVLD)) + dwc2_clear_bit(hsotg, DCTL, DCTL_SFTDISCON); } /** -- 2.35.1
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