linux-kernel - Re: [PATCH 1/2] usb: chipidea: msm: Use posted data writes on AHB

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Message-ID: <20151106082429.GA569@shlinux2>
Date:	Fri, 6 Nov 2015 16:24:31 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Andy Gross <agross@...eaurora.org>,
	Greg KH <gregkh@...uxfoundation.org>
CC:	<linux-usb@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	<linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 1/2] usb: chipidea: msm: Use posted data writes on AHB

On Fri, Nov 06, 2015 at 12:04:06AM -0600, 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>
> ---
>  drivers/usb/chipidea/ci_hdrc_msm.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
> index d79ecc0..3889809 100644
> --- a/drivers/usb/chipidea/ci_hdrc_msm.c
> +++ b/drivers/usb/chipidea/ci_hdrc_msm.c
> @@ -25,7 +25,8 @@ static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
>  	case CI_HDRC_CONTROLLER_RESET_EVENT:
>  		dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n");
>  		writel(0, USB_AHBBURST);
> -		writel(0, USB_AHBMODE);
> +		/* use AHB transactor, allow posted data writes */
> +		writel(0x8, USB_AHBMODE);
>  		usb_phy_init(ci->usb_phy);
>  		break;
>  	case CI_HDRC_CONTROLLER_STOPPED_EVENT:
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
> 

Greg, another related changes is at host driver, pick it up
directly please, thanks.

Acked-by: Peter Chen <peter.chen@...escale.com>

-- 

Best Regards,
Peter Chen
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