From mboxrd@z Thu Jan 1 00:00:00 1970 From: Georgi Djakov Subject: Re: [PATCH 2/2] usb: host: ehci-msm: Use posted data writes on AHB Date: Fri, 6 Nov 2015 12:13:00 +0200 Message-ID: <563C7D2C.9080909@linaro.org> References: <1446789847-640-1-git-send-email-agross@codeaurora.org> <1446789847-640-3-git-send-email-agross@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: Received: from mail-wm0-f53.google.com ([74.125.82.53]:33528 "EHLO mail-wm0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161162AbbKFKNG (ORCPT ); Fri, 6 Nov 2015 05:13:06 -0500 Received: by wmec201 with SMTP id c201so13635573wme.0 for ; Fri, 06 Nov 2015 02:13:04 -0800 (PST) In-Reply-To: <1446789847-640-3-git-send-email-agross@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org To: Andy Gross , linux-usb@vger.kernel.org Cc: Greg KH , Peter Chen , Alan Stern , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org 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 With these patches I see significant improvement in throughput on my db410c board. Tested-by: Georgi Djakov > --- > 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); > >