linux-kernel - Re: [PATCH v3 6/9] usb: allow to supply the PHY in the drivers when using HCD

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Date:	Fri, 22 Aug 2014 21:08:18 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>, balbi@...com,
	gregkh@...uxfoundation.org, Peter.Chen@...escale.com,
	kishon@...com, stern@...land.harvard.edu
CC:	yoshihiro.shimoda.uh@...esas.com,
	alexandre.belloni@...e-electrons.com,
	thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
	jszhang@...vell.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 6/9] usb: allow to supply the PHY in the drivers when
 using HCD

On 08/22/2014 08:53 PM, Sergei Shtylyov wrote:

>> This patch modify the generic code handling PHYs to allow them to be
>> supplied from the drivers. This adds checks to ensure no PHY was already
>> there when looking for one in the generic code. This also makes sure we
>> do not modify its state in the generic HCD functions, it was provided by
>> the driver.

>> Signed-off-by: Antoine Ténart <antoine.tenart@...e-electrons.com>
>> Acked-by: Alan Stern <stern@...land.harvard.edu>
>> ---
>>   drivers/usb/core/hcd.c | 7 ++++---
>>   1 file changed, 4 insertions(+), 3 deletions(-)

>> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
>> index 6619239baf6d..dc0e46e5e618 100644
>> --- a/drivers/usb/core/hcd.c
>> +++ b/drivers/usb/core/hcd.c
[...]
>> @@ -2666,6 +2666,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
>>                   goto err_phy;
>>               }
>>               hcd->phy = phy;
>> +            hcd->remove_phy = 1;
>>           }
>>       }

>> @@ -2812,7 +2813,7 @@ err_allocate_root_hub:
>>   err_register_bus:
>>       hcd_buffer_destroy(hcd);
>>   err_create_buf:
>> -    if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->phy) {
>> +    if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->remove_phy && hcd->phy) {

>     The 'hcd->phy' check seems redundant now.

    Oh, sorry, I forgot about USB PHY which also sets this flag.

WBR, Segei

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