linux-kernel - Re: [PATCH v3 1/5] xhci: add a quirk for device disconnection errata for Synopsis Designware USB3 core

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Date:	Mon, 16 Feb 2015 11:26:36 +0200
From:	Mathias Nyman <mathias.nyman@...el.com>
To:	Sneeker Yeh <sneeker.yeh@...il.com>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...aro.org>,
	Huang Rui <ray.huang@....com>,
	Kishon Vijay Abraham I <kishon@...com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Andy Green <andy.green@...aro.org>,
	Jassi Brar <jaswinder.singh@...aro.org>,
	Sneeker Yeh <Sneeker.Yeh@...fujitsu.com>
Subject: Re: [PATCH v3 1/5] xhci: add a quirk for device disconnection errata
 for Synopsis Designware USB3 core

On 15.02.2015 16:29, Sneeker Yeh wrote:
> hi Mathias:
> 
> thanks for reviewing these patch,
> and sorry for replying lately~
> 

>>> +     status = readl(port_array[dev_port_num - 1]);
>>> +
>>> +     /* write 1 to clear */
>>> +     if (!(status & PORT_CONNECT) && (status & PORT_CSC))
>>> +             writel(status & PORT_CSC, port_array[0]);
>>
>> Shouldn't this be writel(...,port_array[dev_port_num - 1]) ?
> 
> yes, thanks for correcting this,
> and I also would like to add xhci_port_state_to_neutral() you mentioned.
> what would you think if I modify it like this?
> 
> +       /* write 1 to clear */
> +       if (!(status & PORT_CONNECT) && (status & PORT_CSC)) {
> +               status = xhci_port_state_to_neutral(status);
> +               writel(status | PORT_CSC, port_array[dev_port_num - 1]);
> +       }
> 

Looks good to me

-Mathias

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