> -----Original Message----- > From: Felipe Balbi [mailto:felipe.balbi@xxxxxxxxxxxxxxx] > Sent: Friday, June 09, 2017 2:04 PM > To: Jiahau Chang; linux-usb@xxxxxxxxxxxxxxx; mathias.nyman@xxxxxxxxx > Cc: Brain Lee(李魁中); mario.limonciello@xxxxxxxx; Justin_CY Chen(陳志勇); > keith_Wang@xxxxxxxx; Yd Tseng(曾裕達); Jiahau Chang; Lars Chang(張家豪) > Subject: Re: [PATCH v2] xhci: Bad Ethernet performance plugged in ASM1042A > host > > > Hi, > > Jiahau Chang <jiahau@xxxxxxxxx> writes: > > v2 : fix coding format > > this doesn't need to be in the commit log. You should place such notes > after the tearline (---) below I will move it after the tearline. Should I need to resend the patch? > > > 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. > > > > Signed-off-by: Jiahau Chang <Lars_chang@xxxxxxxxxxxxxx> > > --- > > drivers/usb/host/pci-quirks.c | 62 > +++++++++++++++++++++++++++++++++++++++++++ > > drivers/usb/host/pci-quirks.h | 1 + > > drivers/usb/host/xhci-pci.c | 5 ++++ > > drivers/usb/host/xhci.c | 3 +++ > > drivers/usb/host/xhci.h | 1 + > > 5 files changed, 72 insertions(+) > > > > diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c > > index a9a1e4c..bdeaf75 100644 > > --- a/drivers/usb/host/pci-quirks.c > > +++ b/drivers/usb/host/pci-quirks.c > > @@ -77,6 +77,12 @@ > > #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 > > + > > /* > > * amd_chipset_gen values represent AMD different chipset generations > > */ > > @@ -412,6 +418,62 @@ void usb_amd_quirk_pll_disable(void) > > } > > EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_disable); > > > > +void usb_asmedia_modifyflowcontrol(struct pci_dev *pdev) > > +{ > > + u32 value_low, value_high; > > + unsigned char value; > > + unsigned long wait_time_count; > > + > > + wait_time_count = 1000; > > + while (wait_time_count) { > > + pci_read_config_byte(pdev, ASMT_CONTROL_REG, &value); > > + if (value == 0xff) { > > + dev_dbg(&pdev->dev, "%s: wait_write_ready IO_ERROR, > value=%x\n", > > + __func__, value); > > + goto err_exit; > > + } else if ((value & ASMT_CONTROL_WRITE_BIT) == 0) { > > + break; > > + } > > + wait_time_count--; > > + udelay(50); > > + } > > + if (wait_time_count == 0) { > > + dev_dbg(&pdev->dev, "%s: wait_write_ready timeout\n", > > + __func__); > > + goto err_exit; > > + } > > + value_low = 0x00010423; > > + value_high = 0xFA30; > > sorry, no magic constants > > > + pci_write_config_dword(pdev, ASMT_DATA_WRITE0_REG, value_low); > > + pci_write_config_dword(pdev, ASMT_DATA_WRITE1_REG, value_high); > > + pci_write_config_byte(pdev, ASMT_CONTROL_REG, > ASMT_CONTROL_WRITE_BIT); > > + wait_time_count = 1000; > > + while (wait_time_count) { > > + pci_read_config_byte(pdev, ASMT_CONTROL_REG, &value); > > + if (value == 0xff) { > > + dev_dbg(&pdev->dev, "%s: wait_write_ready IO_ERROR, > value=%x\n", > > + __func__, value); > > + goto err_exit; > > indentation > > > + } else if ((value & ASMT_CONTROL_WRITE_BIT) == 0) { > > + break; > > + } > > + wait_time_count--; > > + udelay(50); > > + } > > + if (wait_time_count == 0) { > > + dev_dbg(&pdev->dev, "%s: wait_write_ready timeout\n", > > + __func__); > > + goto err_exit; > > + } > > + pci_write_config_dword(pdev, ASMT_DATA_WRITE0_REG, 0xBA); > > + pci_write_config_dword(pdev, ASMT_DATA_WRITE1_REG, 0); > > likewise > > > diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h > > index 73a28a9..ed58f87 100644 > > --- a/drivers/usb/host/xhci.h > > +++ b/drivers/usb/host/xhci.h > > @@ -1819,6 +1819,7 @@ struct xhci_hcd { > > /* For controller with a broken Port Disable implementation */ > > #define XHCI_BROKEN_PORT_PED (1 << 25) > > #define XHCI_LIMIT_ENDPOINT_INTERVAL_7 (1 << 26) > > +#define XHCI_ASMEDIA_MODIFY_FLOWCONTROL (1<<27) > > spaces around << > > -- > balbi ================================================================================================================== This email and any attachments to it contain confidential information and are intended solely for the use of the individual to whom it is addressed.If you are not the intended recipient or receive it accidentally, please immediately notify the sender by e-mail and delete the message and any attachments from your computer system, and destroy all hard copies. 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