linux-kernel - Re: [PATCH v4] USB: ehci-pci: USB host controller support for Intel Quark X1000

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Date:	Wed, 02 Jul 2014 09:34:48 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Alan Stern' <stern@...land.harvard.edu>,
	"'Chen, Alvin'" <alvin.chen@...el.com>
Cc:	'Sergei Shtylyov' <sergei.shtylyov@...entembedded.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	'Boon Leong Ong' <boon.leong.ong@...el.com>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH v4] USB: ehci-pci: USB host controller support for Intel
 Quark X1000

On Tuesday, July 01, 2014 11:12 PM, Alan Stern wrote: 
> On Tue, 1 Jul 2014, Chen, Alvin wrote:
> 
> > From: Bryan O'Donoghue <bryan.odonoghue@...el.com>
> >
> > The EHCI packet buffer in/out threshold is programmable for Intel Quark X1000
> > USB host controller, and the default value is 0x20 dwords. The in/out threshold
> > can be programmed to 0x80 dwords (512 Bytes) to maximize the perfomrance,
> > but only when isochronous/interrupt transactions are not initiated by the USB
> > host controller. This patch is to reconfigure the packet buffer in/out
> > threshold as maximal as possible to maximize the performance, and 0x7F dwords
> > (508 Bytes) should be used because the USB host controller initiates
> > isochronous/interrupt transactions.
> >
> > Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...el.com>
> > Signed-off-by: Alvin (Weike) Chen <alvin.chen@...el.com>
> 
> Acked-by: Alan Stern <stern@...land.harvard.edu>

Reviewed-by: Jingoo Han <jg1.han@...sung.com>

Best regards,
Jingoo Han

> 
> There's one error in the style...
> 
> > diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
> > index 3e86bf4..429434d 100644
> > --- a/drivers/usb/host/ehci-pci.c
> > +++ b/drivers/usb/host/ehci-pci.c
> > @@ -35,6 +35,21 @@ static const char hcd_name[] = "ehci-pci";
> >  #define PCI_DEVICE_ID_INTEL_CE4100_USB	0x2e70
> >
> >  /*-------------------------------------------------------------------------*/
> > +#define PCI_DEVICE_ID_INTEL_QUARK_X1000_SOC		0x0939
> > +static inline bool is_intel_quark_x1000(struct pci_dev *pdev)
> > +{
> > +	return pdev->vendor == PCI_VENDOR_ID_INTEL &&
> > +		pdev->device == PCI_DEVICE_ID_INTEL_QUARK_X1000_SOC;
> > +}
> > +
> > +/*
> > +	* 0x84 is the offset of in/out threshold register,
> > +	* and it is the same offset as the register of 'hostpc'.
> > +	*/
> 
> This comment isn't formatted right.  It should be like this:
> 
> /*
>  * blah blah blah
>  * blah blah blah
>  */
> 
> If you want to submit a corrected version, you can.  Or Greg may be
> willing to fix the style when he merges this patch.
> 
> Alan Stern


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