5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Roger Quadros <rogerq@xxxxxxxxxx> commit 9cfb31e4c89d200d8ab7cb1e0bb9e6e8d621ca0b upstream. If the device was already runtime suspended then during system suspend we cannot access the device registers else it will crash. Also we cannot access any registers after dwc3_core_exit() on some platforms so move the dwc3_enable_susphy() call to the top. Cc: stable@xxxxxxxxxxxxxxx # v5.15+ Reported-by: William McVicker <willmcvicker@xxxxxxxxxx> Closes: https://lore.kernel.org/all/ZyVfcUuPq56R2m1Y@xxxxxxxxxx Fixes: 705e3ce37bcc ("usb: dwc3: core: Fix system suspend on TI AM62 platforms") Signed-off-by: Roger Quadros <rogerq@xxxxxxxxxx> Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> Tested-by: Will McVicker <willmcvicker@xxxxxxxxxx> Link: https://lore.kernel.org/r/20241104-am62-lpm-usb-fix-v1-1-e93df73a4f0d@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/dwc3/core.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1796,10 +1796,18 @@ static int dwc3_suspend_common(struct dw { u32 reg; - dwc->susphy_state = (dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)) & - DWC3_GUSB2PHYCFG_SUSPHY) || - (dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0)) & - DWC3_GUSB3PIPECTL_SUSPHY); + if (!pm_runtime_suspended(dwc->dev) && !PMSG_IS_AUTO(msg)) { + dwc->susphy_state = (dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)) & + DWC3_GUSB2PHYCFG_SUSPHY) || + (dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0)) & + DWC3_GUSB3PIPECTL_SUSPHY); + /* + * TI AM62 platform requires SUSPHY to be + * enabled for system suspend to work. + */ + if (!dwc->susphy_state) + dwc3_enable_susphy(dwc, true); + } switch (dwc->current_dr_role) { case DWC3_GCTL_PRTCAP_DEVICE: @@ -1848,15 +1856,6 @@ static int dwc3_suspend_common(struct dw break; } - if (!PMSG_IS_AUTO(msg)) { - /* - * TI AM62 platform requires SUSPHY to be - * enabled for system suspend to work. - */ - if (!dwc->susphy_state) - dwc3_enable_susphy(dwc, true); - } - return 0; }
