xhci: Bad Ethernet performance plugged in ASM1042A host

commit 9da5a1092b13468839b1a864b126cacfb72ad016 upstream.

When USB Ethernet is plugged in ASMEDIA ASM1042A xHCI host, bad
performance was manifesting in Web browser use (like download
large file such as ISO image). It is known limitation of
ASM1042A that is not compatible with driver scheduling,
As a workaround we can modify flow control handling of ASM1042A.
The register we modify is changes the behavior

[use quirk bit 28, usleep_range 40-60us, empty non-pci function -Mathias]
Signed-off-by: Jiahau Chang <Lars_chang@asmedia.com.tw>
Signed-off-by: Ian Pilcher <arequipeno@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index a9a1e4c..c8989c6 100644 (file)
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -77,6 +77,16 @@
 #define USB_INTEL_USB3_PSSEN   0xD8
 #define USB_INTEL_USB3PRM      0xDC
 
+/* ASMEDIA quirk use */
+#define ASMT_DATA_WRITE0_REG   0xF8
+#define ASMT_DATA_WRITE1_REG   0xFC
+#define ASMT_CONTROL_REG       0xE0
+#define ASMT_CONTROL_WRITE_BIT 0x02
+#define ASMT_WRITEREG_CMD      0x10423
+#define ASMT_FLOWCTL_ADDR      0xFA30
+#define ASMT_FLOWCTL_DATA      0xBA
+#define ASMT_PSEUDO_DATA       0
+
 /*
  * amd_chipset_gen values represent AMD different chipset generations
  */
@@ -412,6 +422,50 @@ void usb_amd_quirk_pll_disable(void)
 }
 EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_disable);
 
+static int usb_asmedia_wait_write(struct pci_dev *pdev)
+{
+       unsigned long retry_count;
+       unsigned char value;
+
+       for (retry_count = 1000; retry_count > 0; --retry_count) {
+
+               pci_read_config_byte(pdev, ASMT_CONTROL_REG, &value);
+
+               if (value == 0xff) {
+                       dev_err(&pdev->dev, "%s: check_ready ERROR", __func__);
+                       return -EIO;
+               }
+
+               if ((value & ASMT_CONTROL_WRITE_BIT) == 0)
+                       return 0;
+
+               usleep_range(40, 60);
+       }
+
+       dev_warn(&pdev->dev, "%s: check_write_ready timeout", __func__);
+       return -ETIMEDOUT;
+}
+
+void usb_asmedia_modifyflowcontrol(struct pci_dev *pdev)
+{
+       if (usb_asmedia_wait_write(pdev) != 0)
+               return;
+
+       /* send command and address to device */
+       pci_write_config_dword(pdev, ASMT_DATA_WRITE0_REG, ASMT_WRITEREG_CMD);
+       pci_write_config_dword(pdev, ASMT_DATA_WRITE1_REG, ASMT_FLOWCTL_ADDR);
+       pci_write_config_byte(pdev, ASMT_CONTROL_REG, ASMT_CONTROL_WRITE_BIT);
+
+       if (usb_asmedia_wait_write(pdev) != 0)
+               return;
+
+       /* send data to device */
+       pci_write_config_dword(pdev, ASMT_DATA_WRITE0_REG, ASMT_FLOWCTL_DATA);
+       pci_write_config_dword(pdev, ASMT_DATA_WRITE1_REG, ASMT_PSEUDO_DATA);
+       pci_write_config_byte(pdev, ASMT_CONTROL_REG, ASMT_CONTROL_WRITE_BIT);
+}
+EXPORT_SYMBOL_GPL(usb_asmedia_modifyflowcontrol);
+
 void usb_amd_quirk_pll_enable(void)
 {
        usb_amd_quirk_pll(0);

diff --git a/drivers/usb/host/pci-quirks.h b/drivers/usb/host/pci-quirks.h
index c622ddf..6463fdb 100644 (file)
--- a/drivers/usb/host/pci-quirks.h
+++ b/drivers/usb/host/pci-quirks.h
@@ -11,6 +11,7 @@ bool usb_amd_prefetch_quirk(void);
 void usb_amd_dev_put(void);
 void usb_amd_quirk_pll_disable(void);
 void usb_amd_quirk_pll_enable(void);
+void usb_asmedia_modifyflowcontrol(struct pci_dev *pdev);
 void usb_enable_intel_xhci_ports(struct pci_dev *xhci_pdev);
 void usb_disable_xhci_ports(struct pci_dev *xhci_pdev);
 void sb800_prefetch(struct device *dev, int on);
@@ -18,6 +19,7 @@ void sb800_prefetch(struct device *dev, int on);
 struct pci_dev;
 static inline void usb_amd_quirk_pll_disable(void) {}
 static inline void usb_amd_quirk_pll_enable(void) {}
+static inline void usb_asmedia_modifyflowcontrol(struct pci_dev *pdev) {}
 static inline void usb_amd_dev_put(void) {}
 static inline void usb_disable_xhci_ports(struct pci_dev *xhci_pdev) {}
 static inline void sb800_prefetch(struct device *dev, int on) {}

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 672751e..2383344 100644 (file)
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -59,6 +59,8 @@
 #define PCI_DEVICE_ID_AMD_PROMONTORYA_2                        0x43bb
 #define PCI_DEVICE_ID_AMD_PROMONTORYA_1                        0x43bc
 
+#define PCI_DEVICE_ID_ASMEDIA_1042A_XHCI               0x1142
+
 static const char hcd_name[] = "xhci_hcd";
 
 static struct hc_driver __read_mostly xhci_pci_hc_driver;
@@ -217,6 +219,10 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
                        pdev->device == 0x1142)
                xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 
+       if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
+               pdev->device == PCI_DEVICE_ID_ASMEDIA_1042A_XHCI)
+               xhci->quirks |= XHCI_ASMEDIA_MODIFY_FLOWCONTROL;
+
        if (pdev->vendor == PCI_VENDOR_ID_TI && pdev->device == 0x8241)
                xhci->quirks |= XHCI_LIMIT_ENDPOINT_INTERVAL_7;
 

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 34e23c7..82308af 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -192,6 +192,9 @@ int xhci_reset(struct xhci_hcd *xhci)
        if (ret)
                return ret;
 
+       if (xhci->quirks & XHCI_ASMEDIA_MODIFY_FLOWCONTROL)
+               usb_asmedia_modifyflowcontrol(to_pci_dev(xhci_to_hcd(xhci)->self.controller));
+
        xhci_dbg_trace(xhci, trace_xhci_dbg_init,
                         "Wait for controller to be ready for doorbell rings");
        /*
@@ -1122,6 +1125,9 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
        if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && !comp_timer_running)
                compliance_mode_recovery_timer_init(xhci);
 
+       if (xhci->quirks & XHCI_ASMEDIA_MODIFY_FLOWCONTROL)
+               usb_asmedia_modifyflowcontrol(to_pci_dev(hcd->self.controller));
+
        /* Re-enable port polling. */
        xhci_dbg(xhci, "%s: starting port polling.\n", __func__);
        set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);

diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 8336e07..a0f4a9f 100644 (file)
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1661,6 +1661,7 @@ struct xhci_hcd {
 #define XHCI_BROKEN_PORT_PED   (1 << 25)
 #define XHCI_LIMIT_ENDPOINT_INTERVAL_7 (1 << 26)
 #define XHCI_U2_DISABLE_WAKE   (1 << 27)
+#define XHCI_ASMEDIA_MODIFY_FLOWCONTROL        (1 << 28)
 
        unsigned int            num_active_eps;
        unsigned int            limit_active_eps;