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

[Sriram Dash]

>From: 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?
>

Yes York. Will modify in v2.

>York