linux-kernel - RE: [PATCH] USB: ehci-pci: USB host controller support for Intel Quark X1000

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Date:	Wed, 25 Jun 2014 09:22:18 +0000
From:	"Chen, Alvin" <alvin.chen@...el.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Ong, Boon Leong" <boon.leong.ong@...el.com>
Subject: RE: [PATCH] USB: ehci-pci: USB host controller support for Intel
 Quark X1000

See my comments below:

> > +	/* Reset the threshold limit */
> > +	if(unlikely(usb_is_intel_qrk(pdev)))
> 
>     Please run your patch thru scripts/checkpatch.pl -- space needed after
> *if*.
OK, I will improve it in the PATCH v2.

> 
> > +		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);
> 
>     Why not use DECLARE_PCI_FIXUP_FINAL() instead?
> 
Alan Stern suggests me to move 'usb_is_intel_qrk' and 'usb_set_qrk_bulk_thresh' to ehci-pci.c. 
Since no other modules call these two functions, I will move them to ehci-pci.c as static functions, so no necessary to export them out.

> > +
> > +#define EHCI_INSNREG01		0x84
> > +#define EHCI_INSNREG01_THRESH	0x007F007F	/* Threshold value */
> > +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);
> 
>     I doubt these dev_printk() calls are really useful. But if the are, it's worth
> merging them into one call.
Actually, the dev_printk calls is not necessary, I will remove them in the PATCH v2.

> 
> WBR, Sergei

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