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

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Message-ID: <563C7D2C.9080909@linaro.org>
Date:	Fri, 6 Nov 2015 12:13:00 +0200
From:	Georgi Djakov <georgi.djakov@...aro.org>
To:	Andy Gross <agross@...eaurora.org>, linux-usb@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Peter Chen <Peter.Chen@...escale.com>,
	Alan Stern <stern@...land.harvard.edu>,
	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 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);
>  
> 

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