FAILED: patch "[PATCH] usb: dwc3: Move GUID programming after PHY initialization" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x aad35f9c926ec220b0742af1ada45666ae667956
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026051246-eccentric-slighting-f752@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From aad35f9c926ec220b0742af1ada45666ae667956 Mon Sep 17 00:00:00 2001
From: Selvarasu Ganesan <[email protected]>
Date: Fri, 17 Apr 2026 12:03:11 +0530
Subject: [PATCH] usb: dwc3: Move GUID programming after PHY initialization

The Linux Version Code is currently written to the GUID register before PHY initialization. Certain PHY implementations (such as Synopsys eUSB PHY performing link_sw_reset) clear the GUID register to its default value during initialization, causing the kernel version information to be lost.

Move the GUID register programming to occur after PHY initialization completes to ensure the Linux version information persists.

index 58899b1fa96d..65213896de99 100644
@@ -1359,12 +1359,6 @@ int dwc3_core_init(struct dwc3 *dwc)
 
 	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
 
-	/*
-	 * Write Linux Version Code to our GUID register so it's easy to figure
-	 * out which kernel version a bug was found.
-	 */
-	dwc3_writel(dwc, DWC3_GUID, LINUX_VERSION_CODE);
-
 	ret = dwc3_phy_setup(dwc);
 	if (ret)
 		return ret;

@@ -1398,6 +1392,12 @@ int dwc3_core_init(struct dwc3 *dwc)
 	if (ret)
 		goto err_exit_phy;
 
+	/*
+	 * Write Linux Version Code to our GUID register so it's easy to figure
+	 * out which kernel version a bug was found.
+	 */
+	dwc3_writel(dwc, DWC3_GUID, LINUX_VERSION_CODE);
+
 	dwc3_core_setup_global_control(dwc);
 	dwc3_core_num_eps(dwc);
 

From: Selvarasu Ganesan <[email protected]>

[ Upstream commit aad35f9c926ec220b0742af1ada45666ae667956 ]

The Linux Version Code is currently written to the GUID register before PHY initialization. Certain PHY implementations (such as Synopsys eUSB PHY performing link_sw_reset) clear the GUID register to its default value during initialization, causing the kernel version information to be lost.

Move the GUID register programming to occur after PHY initialization completes to ensure the Linux version information persists.

---
 drivers/usb/dwc3/core.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

index 11b938fd9de04..3ac0de8351f54 100644
@@ -1240,12 +1240,6 @@ static int dwc3_core_init(struct dwc3 *dwc)
 
 	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
 
-	/*
-	 * Write Linux Version Code to our GUID register so it's easy to figure
-	 * out which kernel version a bug was found.
-	 */
-	dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE);
-
 	ret = dwc3_phy_setup(dwc);
 	if (ret)
 		return ret;

@@ -1277,6 +1271,12 @@ static int dwc3_core_init(struct dwc3 *dwc)
 	if (ret)
 		goto err_exit_phy;
 
+	/*
+	 * Write Linux Version Code to our GUID register so it's easy to figure
+	 * out which kernel version a bug was found.
+	 */
+	dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE);
+
 	dwc3_core_setup_global_control(dwc);
 	dwc3_core_num_eps(dwc);
 

2.53.0