linux-kernel - Re: [PATCH 2/2] usb: host: ehci-msm: Use posted data writes on AHB

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Message-ID: <Pine.LNX.4.44L0.1511061040460.2082-100000@iolanthe.rowland.org>
Date:	Fri, 6 Nov 2015 10:41:07 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Georgi Djakov <georgi.djakov@...aro.org>
cc:	Andy Gross <agross@...eaurora.org>, <linux-usb@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Peter Chen <Peter.Chen@...escale.com>,
	<linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 2/2] usb: host: ehci-msm: Use posted data writes on AHB

On Fri, 6 Nov 2015, Georgi Djakov wrote:

> On 11/06/2015 08:04 AM, Andy Gross wrote:
> > This patch sets the AHBMODE to allow for posted data writes.  This
> > results in higher performance.
> > 
> > Signed-off-by: Andy Gross <agross@...eaurora.org>
> 
> With these patches I see significant improvement in throughput
> on my db410c board.
> 
> Tested-by: Georgi Djakov <georgi.djakov@...aro.org>
> 
> > ---
> >  drivers/usb/host/ehci-msm.c |    4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
> > index c4f84c8..c23e285 100644
> > --- a/drivers/usb/host/ehci-msm.c
> > +++ b/drivers/usb/host/ehci-msm.c
> > @@ -57,8 +57,8 @@ static int ehci_msm_reset(struct usb_hcd *hcd)
> >  
> >  	/* bursts of unspecified length. */
> >  	writel(0, USB_AHBBURST);
> > -	/* Use the AHB transactor */
> > -	writel(0, USB_AHBMODE);
> > +	/* Use the AHB transactor, allow posted data writes */
> > +	writel(0x8, USB_AHBMODE);
> >  	/* Disable streaming mode and select host mode */
> >  	writel(0x13, USB_USBMODE);

Acked-by: Alan Stern <stern@...land.harvard.edu>

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