linux-kernel - Re: [PATCH v4 1/5] xhci: add a quirk for device disconnection errata for Synopsis Designware USB3 core

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Date:	Wed, 18 Feb 2015 22:02:32 +0800
From:	Sneeker Yeh <sneeker.yeh@...il.com>
To:	Mathias Nyman <mathias.nyman@...el.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 v4 1/5] xhci: add a quirk for device disconnection errata
 for Synopsis Designware USB3 core

hi Mathias,

thanks for reviewing these,

2015-02-18 16:47 GMT+08:00 Mathias Nyman <mathias.nyman@...el.com>:
> Hi
>
> This looks correct, but if you are still going to make a new series fixing
> Felipe's comments then the following tiny nitpicks could be fixed as well.
>
> Otherwise
>
> Acked-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
>
> Felipe, Do you want to take this series through your tree?
>
> On 17.02.2015 07:41, Sneeker Yeh wrote:
>>
>> +static void xhci_try_to_clear_csc(struct usb_hcd *hcd, int dev_port_num)
>
> Either add a function description explaining something like "Late clearing of connect status.
> Some quirky hardware will suspend the controller when CSC bit is cleared and leave URBs unhandled"
>
> Or change the function name to something like xhci_late_csc_clear_quirk() or xhci_deferred_csc_clear_quirk()
>
> Maybe the name should be changed anyways.
> The "try to" makes it look like some non-blocking version of a csc clear function.

hm...thanks...it totally make sense,
i'd like to use xhci_deferred_csc_clear_quirk(), and will take it to
my next patches.

>
>> +{
>> +     int max_ports;
>> +     struct xhci_hcd *xhci = hcd_to_xhci(hcd);
>> +     __le32 __iomem **port_array;
>> +     u32 status;
>> +
>> +     /* print debug info */
>
> Remove this comment

okay, i see.

>
>> +     if (hcd->speed == HCD_USB3) {
>> +             max_ports = xhci->num_usb3_ports;
>> +             port_array = xhci->usb3_ports;
>> +     } else {
>> +             max_ports = xhci->num_usb2_ports;
>> +             port_array = xhci->usb2_ports;
>> +     }
>> +
>> +     if (dev_port_num > max_ports) {
>> +             xhci_err(xhci, "%s() port number invalid", __func__);
>> +             return;
>> +     }
>> +     status = readl(port_array[dev_port_num - 1]);
>> +
>> +     /* write 1 to clear */
>
> Not really a helpful comment either, either remove or change to something like
> "clearing the connect status bit will now immediately suspend these quirky controllers"

okay, i got it ,
thanks.

Much appreciate,
Sneeker

>
> -Mathias
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