linux-kernel - Re: [PATCH] net/macb: fix ISR clear-on-write behavior only for some SoC

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Date:	Tue, 14 May 2013 15:31:33 +0800
From:	Hein Tibosch <hein_tibosch@...oo.es>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
CC:	Nicolas Ferre <nicolas.ferre@...el.com>, michal.simek@...inx.com,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	s.trumtrar@...gutronix.de, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net/macb: fix ISR clear-on-write behavior only for some
 SoC

On 5/14/2013 3:22 PM, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On May 14, 2013, at 3:18 PM, Hein Tibosch <hein_tibosch@...oo.es> wrote:
>
>> On 5/14/2013 1:52 PM, Jean-Christophe PLAGNIOL-VILLARD wrote:
>>> On 08:58 Tue 14 May     , Hein Tibosch wrote:
>>>> On 5/14/2013 12:05 AM, Jean-Christophe PLAGNIOL-VILLARD wrote:
>>>>> On May 14, 2013, at 12:05 AM, Nicolas Ferre <nicolas.ferre@...el.com> wrote:
>>>>>
>>>>>> Commit 749a2b6 (net/macb: clear tx/rx completion flags in ISR)
>>>>>> introduces clear-on-write on ISR register. This behavior is not always
>>>>>> implemented when using Cadence MACB/GEM and is breaking other platforms.
>>>>>> We are using a new Device Tree compatibility string and a capability
>>>>>> property to actually activate this clear-on-write behavior on ISR.
>>>>>>
>>>>>> Reported-by: Hein Tibosch <hein_tibosch@...oo.es>
>>>>>> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
>>>>> can we detect it via the IP?
>>>> This was my first proposal, have it based on the value of MACB's
>>>> register 'MID' (offset 0x00fc, lower 16 bits).
>>>> On avr32 it reads: 0x0000010D, on Zynq it reports 0x00000119
>>>>
>>>> So for the moment, CAPS_ISR_CLEAR_ON_WRITE could be set if the revision
>>>> equals to 0x00000119?
>>> so no it will not work
>>>
>>> as the gem on sama5 is 00020119
>>>
>>> so version 0x119 too
>>>
>>> nico
>> All right, that's a pity.
>>
>> The only issue that remains then is the obligation to use CONFIG_OF,
>> or:
>>
>> +#if defined(CONFIG_OF)
>> +	dev_id = of_match_device(macb_dt_ids, &pdev->dev);
>> +	if (dev_id)
>> +		bp->caps = (u32)dev_id->data;
>> +
>> +#endif
>>
>> ?
> no need as of_match_device is a inline of !OF
Sorry, here's the complete compiler error:
drivers/net/ethernet/cadence/macb.c: In function 'macb_probe':
drivers/net/ethernet/cadence/macb.c:1601: error: 'macb_dt_ids' undeclared (first use in this function)

Earlier, 'macb_dt_ids' is only defined when using OF

Best regards,
Hein

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