On 08/19/2016 07:51 AM, Sriram Dash wrote:
> This is required for better performance, and performs below tuning:
> 1. Enable burst length set, and define it as 4/8/16.
> 2. Set burst request limit to 16 requests.
>
> Signed-off-by: Rajesh Bhagat <rajesh.bha...@nxp.com>
> Signed-off-by: Sriram Dash <sriram.d...@nxp.com>
> ---
> drivers/usb/host/xhci-fsl.c | 13 +++++++++++++
> include/linux/usb/xhci-fsl.h | 3 +++
> 2 files changed, 16 insertions(+)
>
> diff --git a/drivers/usb/host/xhci-fsl.c b/drivers/usb/host/xhci-fsl.c
> index bdcd4f1..082924f 100644
> --- a/drivers/usb/host/xhci-fsl.c
> +++ b/drivers/usb/host/xhci-fsl.c
> @@ -58,6 +58,16 @@ static void fsl_apply_xhci_errata(void)
> }
> }
>
> +static void fsl_xhci_set_beat_burst_length(struct dwc3 *dwc3_reg)
> +{
> + int val = readl(&dwc3_reg->g_sbuscfg0);
> +
> + val &= ~USB3_ENABLE_BEAT_BURST_MASK;
> + writel(val | USB3_ENABLE_BEAT_BURST, &dwc3_reg->g_sbuscfg0);
> + val = readl(&dwc3_reg->g_sbuscfg1);
> + writel(val | USB3_SET_BEAT_BURST_LIMIT, &dwc3_reg->g_sbuscfg1);
setbits_le32() ?
> +}
> +
> static int fsl_xhci_core_init(struct fsl_xhci *fsl_xhci)
> {
> int ret = 0;
> @@ -74,6 +84,9 @@ static int fsl_xhci_core_init(struct fsl_xhci *fsl_xhci)
> /* Set GFLADJ_30MHZ as 20h as per XHCI spec default value */
> dwc3_set_fladj(fsl_xhci->dwc3_reg, GFLADJ_30MHZ_DEFAULT);
>
> + /* Change beat burst and outstanding pipelined transfers requests */
> + fsl_xhci_set_beat_burst_length(fsl_xhci->dwc3_reg);
> +
> return ret;
> }
>
> diff --git a/include/linux/usb/xhci-fsl.h b/include/linux/usb/xhci-fsl.h
> index 199f366..1032763 100644
> --- a/include/linux/usb/xhci-fsl.h
> +++ b/include/linux/usb/xhci-fsl.h
> @@ -20,6 +20,9 @@
> #define USB3_PHY_TX_RX_POWERON (USB3_PHY_RX_POWERON |
> USB3_PHY_TX_POWERON)
> #define USB3_PWRCTL_CLK_CMD_SHIFT 14
> #define USB3_PWRCTL_CLK_FREQ_SHIFT 22
> +#define USB3_ENABLE_BEAT_BURST 0xF
> +#define USB3_ENABLE_BEAT_BURST_MASK 0xFF
> +#define USB3_SET_BEAT_BURST_LIMIT 0xF00
>
> /* USBOTGSS_WRAPPER definitions */
> #define USBOTGSS_WRAPRESET BIT(17)
>
--
Best regards,
Marek Vasut
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