This is a note to let you know that I've just added the patch titled
usb: dwc3: Soft reset phy on probe for host
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-dwc3-soft-reset-phy-on-probe-for-host.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8bea147dfdf823eaa8d3baeccc7aeb041b41944b Mon Sep 17 00:00:00 2001
From: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Date: Wed, 13 Sep 2023 00:52:15 +0000
Subject: usb: dwc3: Soft reset phy on probe for host
From: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
commit 8bea147dfdf823eaa8d3baeccc7aeb041b41944b upstream.
When there's phy initialization, we need to initiate a soft-reset
sequence. That's done through USBCMD.HCRST in the xHCI driver and its
initialization, However, the dwc3 driver may modify core configs before
the soft-reset. This may result in some connection instability. So,
ensure the phy is ready before the controller updates the GCTL.PRTCAPDIR
or other settings by issuing phy soft-reset.
Note that some host-mode configurations may not expose device registers
to initiate the controller soft-reset (via DCTL.CoreSftRst). So we reset
through GUSB3PIPECTL and GUSB2PHYCFG instead.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: e835c0a4e23c ("usb: dwc3: don't reset device side if dwc3 was configured as host-only")
Reported-by: Kenta Sato <tosainu.maple@xxxxxxxxx>
Closes: https://lore.kernel.org/linux-usb/ZPUciRLUcjDywMVS@xxxxxxxxx/
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Tested-by: Kenta Sato <tosainu.maple@xxxxxxxxx>
Link: https://lore.kernel.org/r/70aea513215d273669152696cc02b20ddcdb6f1a.1694564261.git.Thinh.Nguyen@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/core.c | 39 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -277,9 +277,46 @@ int dwc3_core_soft_reset(struct dwc3 *dw
* XHCI driver will reset the host block. If dwc3 was configured for
* host-only mode or current role is host, then we can return early.
*/
- if (dwc->dr_mode == USB_DR_MODE_HOST || dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST)
+ if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST)
return 0;
+ /*
+ * If the dr_mode is host and the dwc->current_dr_role is not the
+ * corresponding DWC3_GCTL_PRTCAP_HOST, then the dwc3_core_init_mode
+ * isn't executed yet. Ensure the phy is ready before the controller
+ * updates the GCTL.PRTCAPDIR or other settings by soft-resetting
+ * the phy.
+ *
+ * Note: GUSB3PIPECTL[n] and GUSB2PHYCFG[n] are port settings where n
+ * is port index. If this is a multiport host, then we need to reset
+ * all active ports.
+ */
+ if (dwc->dr_mode == USB_DR_MODE_HOST) {
+ u32 usb3_port;
+ u32 usb2_port;
+
+ usb3_port = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
+ usb3_port |= DWC3_GUSB3PIPECTL_PHYSOFTRST;
+ dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), usb3_port);
+
+ usb2_port = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
+ usb2_port |= DWC3_GUSB2PHYCFG_PHYSOFTRST;
+ dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), usb2_port);
+
+ /* Small delay for phy reset assertion */
+ usleep_range(1000, 2000);
+
+ usb3_port &= ~DWC3_GUSB3PIPECTL_PHYSOFTRST;
+ dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), usb3_port);
+
+ usb2_port &= ~DWC3_GUSB2PHYCFG_PHYSOFTRST;
+ dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), usb2_port);
+
+ /* Wait for clock synchronization */
+ msleep(50);
+ return 0;
+ }
+
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
reg |= DWC3_DCTL_CSFTRST;
reg &= ~DWC3_DCTL_RUN_STOP;
Patches currently in stable-queue which might be from Thinh.Nguyen@xxxxxxxxxxxx are
queue-5.15/usb-dwc3-soft-reset-phy-on-probe-for-host.patch
