FAILED: patch "[PATCH] xhci: Show ZHAOXIN xHCI root hub speed correctly" failed to apply to 6.1-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.1-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 <stable@vger.kernel.org>.

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-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x d9b0328d0b8b8298dfdc97cd8e0e2371d4bcc97b
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023072121-estrogen-muppet-2973@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

d9b0328d0b8b ("xhci: Show ZHAOXIN xHCI root hub speed correctly")
2a865a652299 ("xhci: Fix TRB prefetch issue of ZHAOXIN hosts")
f927728186f0 ("xhci: Fix resume issue of some ZHAOXIN hosts")

thanks,

greg k-h

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

From d9b0328d0b8b8298dfdc97cd8e0e2371d4bcc97b Mon Sep 17 00:00:00 2001
From: Weitao Wang <WeitaoWang-oc@zhaoxin.com>
Date: Fri, 2 Jun 2023 17:40:08 +0300
Subject: [PATCH] xhci: Show ZHAOXIN xHCI root hub speed correctly

Some ZHAOXIN xHCI controllers follow usb3.1 spec, but only support
gen1 speed 5Gbps. While in Linux kernel, if xHCI suspport usb3.1,
root hub speed will show on 10Gbps.
To fix this issue of ZHAOXIN xHCI platforms, read usb speed ID
supported by xHCI to determine root hub speed. And add a quirk
XHCI_ZHAOXIN_HOST for this issue.

[fix warning about uninitialized symbol -Mathias]

Suggested-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Weitao Wang <WeitaoWang-oc@zhaoxin.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Message-ID: <20230602144009.1225632-11-mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index c4170421bc9c..19a402123de0 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1961,7 +1961,7 @@ static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
 {
 	u32 temp, port_offset, port_count;
 	int i;
-	u8 major_revision, minor_revision;
+	u8 major_revision, minor_revision, tmp_minor_revision;
 	struct xhci_hub *rhub;
 	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
 	struct xhci_port_cap *port_cap;
@@ -1981,6 +1981,15 @@ static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
 		 */
 		if (minor_revision > 0x00 && minor_revision < 0x10)
 			minor_revision <<= 4;
+		/*
+		 * Some zhaoxin's xHCI controller that follow usb3.1 spec
+		 * but only support Gen1.
+		 */
+		if (xhci->quirks & XHCI_ZHAOXIN_HOST) {
+			tmp_minor_revision = minor_revision;
+			minor_revision = 0;
+		}
+
 	} else if (major_revision <= 0x02) {
 		rhub = &xhci->usb2_rhub;
 	} else {
@@ -1989,10 +1998,6 @@ static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
 		/* Ignoring port protocol we can't understand. FIXME */
 		return;
 	}
-	rhub->maj_rev = XHCI_EXT_PORT_MAJOR(temp);
-
-	if (rhub->min_rev < minor_revision)
-		rhub->min_rev = minor_revision;
 
 	/* Port offset and count in the third dword, see section 7.2 */
 	temp = readl(addr + 2);
@@ -2010,8 +2015,6 @@ static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
 	if (xhci->num_port_caps > max_caps)
 		return;
 
-	port_cap->maj_rev = major_revision;
-	port_cap->min_rev = minor_revision;
 	port_cap->psi_count = XHCI_EXT_PORT_PSIC(temp);
 
 	if (port_cap->psi_count) {
@@ -2032,6 +2035,11 @@ static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
 				  XHCI_EXT_PORT_PSIV(port_cap->psi[i - 1])))
 				port_cap->psi_uid_count++;
 
+			if (xhci->quirks & XHCI_ZHAOXIN_HOST &&
+			    major_revision == 0x03 &&
+			    XHCI_EXT_PORT_PSIV(port_cap->psi[i]) >= 5)
+				minor_revision = tmp_minor_revision;
+
 			xhci_dbg(xhci, "PSIV:%d PSIE:%d PLT:%d PFD:%d LP:%d PSIM:%d\n",
 				  XHCI_EXT_PORT_PSIV(port_cap->psi[i]),
 				  XHCI_EXT_PORT_PSIE(port_cap->psi[i]),
@@ -2041,6 +2049,15 @@ static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
 				  XHCI_EXT_PORT_PSIM(port_cap->psi[i]));
 		}
 	}
+
+	rhub->maj_rev = major_revision;
+
+	if (rhub->min_rev < minor_revision)
+		rhub->min_rev = minor_revision;
+
+	port_cap->maj_rev = major_revision;
+	port_cap->min_rev = minor_revision;
+
 	/* cache usb2 port capabilities */
 	if (major_revision < 0x03 && xhci->num_ext_caps < max_caps)
 		xhci->ext_caps[xhci->num_ext_caps++] = temp;
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 3aad946bab68..88c16d91fb69 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -522,6 +522,8 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 		xhci->quirks |= XHCI_NO_SOFT_RETRY;
 
 	if (pdev->vendor == PCI_VENDOR_ID_ZHAOXIN) {
+		xhci->quirks |= XHCI_ZHAOXIN_HOST;
+
 		if (pdev->device == 0x9202) {
 			xhci->quirks |= XHCI_RESET_ON_RESUME;
 			xhci->quirks |= XHCI_ZHAOXIN_TRB_FETCH;
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 5a495126c8ba..7e282b4522c0 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1905,6 +1905,7 @@ struct xhci_hcd {
 #define XHCI_SUSPEND_RESUME_CLKS	BIT_ULL(43)
 #define XHCI_RESET_TO_DEFAULT	BIT_ULL(44)
 #define XHCI_ZHAOXIN_TRB_FETCH	BIT_ULL(45)
+#define XHCI_ZHAOXIN_HOST	BIT_ULL(46)
 
 	unsigned int		num_active_eps;
 	unsigned int		limit_active_eps;