xhci: Show ZHAOXIN xHCI root hub speed correctly

commit d9b0328d0b8b8298dfdc97cd8e0e2371d4bcc97b upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 27 insertions, 7 deletions

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 1532414c8c40..1979702b0fa9 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1968,7 +1968,7 @@ 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;
@@ -1988,6 +1988,15 @@ 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 {
@@ -1996,10 +2005,6 @@ 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);
@@ -2017,8 +2022,6 @@ 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) {
@@ -2039,6 +2042,11 @@ 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]),
@@ -2048,6 +2056,15 @@ 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 31e9ac79f7cc..a410162e15df 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -529,6 +529,8 @@ 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 d4a33fd625ef..4474d540f6b4 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1906,6 +1906,7 @@ 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;