[PATCH v3 3/4] xhci: Show zhaoxin xHCI root hub speed correctly

[Weitao Wang]

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.

Suggested-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Weitao Wang <WeitaoWang-oc@xxxxxxxxxxx>
---
v2->v3
 - Checking port whether support over 5Gbps when parse the protocol
 speed id in xhci_add_in_port_function.

 drivers/usb/host/xhci-mem.c | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 6d00980d0070..8b36ff0f3e69 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 +2042,10 @@ 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 &&
+					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 +2055,15 @@ 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;
-- 
2.32.0