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SubjectRe: [PATCH 2/2] usb: host: ehci-msm: Use posted data writes on AHB
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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@codeaurora.org>

With these patches I see significant improvement in throughput
on my db410c board.

Tested-by: Georgi Djakov <georgi.djakov@linaro.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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