[U-Boot] [PATCH] drivers: usb: xhci-fsl: Implement Erratum A-010151 for FSL USB3 controller

[york sun]

On 08/19/2016 03:13 AM, Sriram Dash wrote:
> Currently the controller by default enables the Receive Detect feature in P3
> mode in USB 3.0 PHY. However, USB 3.0 PHY does not reliably support receive
> detection in P3 mode.
> Enabling the USB3 controller to configure USB in P2 mode whenever the Receive
> Detect feature is required.
>
> Signed-off-by: Sriram Dash <sriram.dash at nxp.com>
> Signed-off-by: Rajesh Bhagat <rajesh.bhagat at nxp.com>
> ---
>  drivers/usb/host/xhci-dwc3.c | 5 +++++
>  drivers/usb/host/xhci-fsl.c  | 7 +++++++
>  include/linux/usb/dwc3.h     | 2 ++
>  3 files changed, 14 insertions(+)
>
> diff --git a/drivers/usb/host/xhci-dwc3.c b/drivers/usb/host/xhci-dwc3.c
> index 33961cd..adbd9b5 100644
> --- a/drivers/usb/host/xhci-dwc3.c
> +++ b/drivers/usb/host/xhci-dwc3.c
> @@ -97,3 +97,8 @@ void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val)
>  	setbits_le32(&dwc3_reg->g_fladj, GFLADJ_30MHZ_REG_SEL |
>  			GFLADJ_30MHZ(val));
>  }
> +
> +void dwc3_set_rxdetect_power_mode(struct dwc3 *dwc3_reg, u32 val)
> +{
> +	setbits_le32(&dwc3_reg->g_usb3pipectl[0], val);
> +}
> diff --git a/drivers/usb/host/xhci-fsl.c b/drivers/usb/host/xhci-fsl.c
> index bdcd4f1..d9dbf1f 100644
> --- a/drivers/usb/host/xhci-fsl.c
> +++ b/drivers/usb/host/xhci-fsl.c
> @@ -74,6 +74,13 @@ 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);
>
> +	/*
> +	 * A-010151: USB controller to configure USB in P2 mode
> +	 * whenever the Receive Detect feature is required
> +	 */
> +	dwc3_set_rxdetect_power_mode(fsl_xhci->dwc3_reg,
> +				     DWC3_GUSB3PIPECTL_DISRXDETP3);
> +

Would it be appropriate to gate the code by checking SoC version?

York