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usb: dwc3: don't reset device side if dwc3 was configured as host-only

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Commit c4a5153e87 ("usb: dwc3: core: Power-off core/PHYs on
system_suspend in host mode") replaces check for HOST only dr_mode with
current_dr_role. But during booting, the current_dr_role isn't
initialized, thus the device side reset is always issued even if dwc3
was configured as host-only. What's more, on some platforms with host
only dwc3, aways issuing device side reset by accessing device register
block can cause kernel panic.

Fixes: c4a5153e87 ("usb: dwc3: core: Power-off core/PHYs on system_suspend in host mode")
Cc: stable <[email protected]>
Signed-off-by: Jisheng Zhang <[email protected]>
Acked-by: Thinh Nguyen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Jisheng Zhang
2023-07-25 17:39:58 +02:00
committed by Greg Kroah-Hartman
parent 71c47ad892
commit e835c0a4e2
1 changed files with 2 additions and 2 deletions
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drivers/usb/dwc3/core.c
+2 -2
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@@ -277,9 +277,9 @@ int dwc3_core_soft_reset(struct dwc3 *dwc)
/*
* We're resetting only the device side because, if we're in host mode,
* XHCI driver will reset the host block. If dwc3 was configured for
* host-only mode, then we can return early.
* host-only mode or current role is host, then we can return early.
*/
if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST)
if (dwc->dr_mode == USB_DR_MODE_HOST || dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST)
return 0;
reg = dwc3_readl(dwc->regs, DWC3_DCTL);