On Wednesday, June 25, 2014 12:52 AM, Alvin Chen wrote:
>
> From: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxx>
>
> This patch is to enable USB host controller for Intel Quark X1000. Add pci quirks
> to adjust the packet buffer in/out threshold value, and ensure EHCI packet buffer
> i/o threshold value is reconfigured to half.
Please add more detailed description. For example, why is it necessary to
reconfigure the threshold value?
>
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxx>
> Signed-off-by: Alvin (Weike) Chen <alvin.chen@xxxxxxxxx>
> ---
> drivers/usb/host/ehci-pci.c | 4 ++++
> drivers/usb/host/pci-quirks.c | 42 +++++++++++++++++++++++++++++++++++++++++
> drivers/usb/host/pci-quirks.h | 2 ++
> 3 files changed, 48 insertions(+)
>
> diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
> index 3e86bf4..33cfa23 100644
> --- a/drivers/usb/host/ehci-pci.c
> +++ b/drivers/usb/host/ehci-pci.c
> @@ -50,6 +50,10 @@ static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
> if (!retval)
> ehci_dbg(ehci, "MWI active\n");
>
> + /* Reset the threshold limit */
> + if(unlikely(usb_is_intel_qrk(pdev)))
> + usb_set_qrk_bulk_thresh(pdev);
> +
> return 0;
> }
>
> diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
> index 00661d3..1ea8803 100644
> --- a/drivers/usb/host/pci-quirks.c
> +++ b/drivers/usb/host/pci-quirks.c
> @@ -823,6 +823,48 @@ static int handshake(void __iomem *ptr, u32 mask, u32 done,
> return -ETIMEDOUT;
> }
>
> +#define PCI_DEVICE_ID_INTEL_QUARK_X1000_SOC 0x0939
> +bool usb_is_intel_qrk(struct pci_dev *pdev)
> +{
> + return pdev->vendor == PCI_VENDOR_ID_INTEL &&
> + pdev->device == PCI_DEVICE_ID_INTEL_QUARK_X1000_SOC;
> +
> +}
> +EXPORT_SYMBOL_GPL(usb_is_intel_qrk);
> +
> +#define EHCI_INSNREG01 0x84
> +#define EHCI_INSNREG01_THRESH 0x007F007F /* Threshold value */
What does this magic number mean?
Would you make it more readable?
> +void usb_set_qrk_bulk_thresh(struct pci_dev *pdev)
> +{
> + void __iomem *base, *op_reg_base;
> + u8 cap_length;
> + u32 val;
> +
> + if (!mmio_resource_enabled(pdev, 0))
> + return;
> +
> + base = pci_ioremap_bar(pdev, 0);
> + if (base == NULL)
> + return;
> +
> + cap_length = readb(base);
> + op_reg_base = base + cap_length;
> +
> + val = readl(op_reg_base + EHCI_INSNREG01);
> + dev_printk(KERN_INFO, &pdev->dev, "INSNREG01 is 0x%08x\n", val);
> +
> + val = EHCI_INSNREG01_THRESH;
> +
> + writel(val, op_reg_base + EHCI_INSNREG01);
> +
> + val = readl(op_reg_base + EHCI_INSNREG01);
> + dev_printk(KERN_INFO, &pdev->dev, "INSNREG01 is 0x%08x\n", val);
As Alan Stern said, These INFO message are noisy.
DEBUG level looks better.
Best regards,
Jingoo Han
> +
> + iounmap(base);
> +
> +}
> +EXPORT_SYMBOL_GPL(usb_set_qrk_bulk_thresh);
> +
> /*
> * Intel's Panther Point chipset has two host controllers (EHCI and xHCI) that
> * share some number of ports. These ports can be switched between either
> diff --git a/drivers/usb/host/pci-quirks.h b/drivers/usb/host/pci-quirks.h
> index c622ddf..617c22b 100644
> --- a/drivers/usb/host/pci-quirks.h
> +++ b/drivers/usb/host/pci-quirks.h
> @@ -14,6 +14,8 @@ void usb_amd_quirk_pll_enable(void);
> 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);
> +bool usb_is_intel_qrk(struct pci_dev *pdev);
> +void usb_set_qrk_bulk_thresh(struct pci_dev *pdev);
> #else
> struct pci_dev;
> static inline void usb_amd_quirk_pll_disable(void) {}
> --
> 1.7.9.5
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