linux-kernel - Re: [PATCH] usb: dwc3: add disable receiver detection in P3 quirk

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Date:	Mon, 14 Mar 2016 08:55:49 +0200
From:	Felipe Balbi <felipe.balbi@...ux.intel.com>
To:	Rajesh Bhagat <rajesh.bhagat@....com>
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	sriram.dash@....com, Rajesh Bhagat <rajesh.bhagat@....com>
Subject: Re: [PATCH] usb: dwc3: add disable receiver detection in P3 quirk


Hi,

Rajesh Bhagat <rajesh.bhagat@....com> writes:
> [ text/plain ]
> Some freescale QorIQ platforms require to disable receiver detection
> in P3 for correct detection of USB devices. If GUSB3PIPECTL(DISRXDETINP3)
> is set, Core will change PHY power state to P2 and then perform receiver 
> detection. After receiver detection, Core will change PHY power state to 
> P3. Same quirk would be added in dts file in future patches. 
>
> Signed-off-by: Sriram Dash <sriram.dash@....com>
> Signed-off-by: Rajesh Bhagat <rajesh.bhagat@....com>
> ---
>  drivers/usb/dwc3/core.c          |    6 ++++++
>  drivers/usb/dwc3/core.h          |    2 ++
>  drivers/usb/dwc3/platform_data.h |    1 +
>  3 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index de5e01f..b2f2b08 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -446,6 +446,9 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
>  	if (dwc->u2ss_inp3_quirk)
>  		reg |= DWC3_GUSB3PIPECTL_U2SSINP3OK;
>  
> +	if (dwc->dis_rxdet_inp3_quirk)
> +		reg |= DWC3_GUSB3PIPECTL_DISRXDETINP3;
> +
>  	if (dwc->req_p1p2p3_quirk)
>  		reg |= DWC3_GUSB3PIPECTL_REQP1P2P3;
>  
> @@ -903,6 +906,8 @@ static int dwc3_probe(struct platform_device *pdev)
>  				"snps,u2exit_lfps_quirk");
>  	dwc->u2ss_inp3_quirk = device_property_read_bool(dev,
>  				"snps,u2ss_inp3_quirk");
> +	dwc->dis_rxdet_inp3_quirk = device_property_read_bool(dev,
> +				"snps,dis_rxdet_inp3_quirk");

not documented under Documentation/devicetree/bindings/usb/dwc3.txt.

> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index e4f8b90..41cc22c 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -193,6 +193,7 @@
>  /* Global USB3 PIPE Control Register */
>  #define DWC3_GUSB3PIPECTL_PHYSOFTRST	(1 << 31)
>  #define DWC3_GUSB3PIPECTL_U2SSINP3OK	(1 << 29)
> +#define DWC3_GUSB3PIPECTL_DISRXDETINP3	(1 << 28)
>  #define DWC3_GUSB3PIPECTL_REQP1P2P3	(1 << 24)
>  #define DWC3_GUSB3PIPECTL_DEP1P2P3(n)	((n) << 19)
>  #define DWC3_GUSB3PIPECTL_DEP1P2P3_MASK	DWC3_GUSB3PIPECTL_DEP1P2P3(7)
> @@ -873,6 +874,7 @@ struct dwc3 {
>  
>  	unsigned		tx_de_emphasis_quirk:1;
>  	unsigned		tx_de_emphasis:2;
> +	unsigned		dis_rxdet_inp3_quirk:1;

_must_ be sorted alphabetically and you _must_ update the kernel doc
above this structure.

>  };
>  
>  /* -------------------------------------------------------------------------- */
> diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h
> index 2bb4d3a..9df1dfb 100644
> --- a/drivers/usb/dwc3/platform_data.h
> +++ b/drivers/usb/dwc3/platform_data.h
> @@ -46,6 +46,7 @@ struct dwc3_platform_data {
>  
>  	unsigned tx_de_emphasis_quirk:1;
>  	unsigned tx_de_emphasis:2;
> +	unsigned dis_rxdet_inp3_quirk:1;

likewise.

-- 
balbi

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