netdev - Re: [PATCH net v4 2/2] net: fec: Let fec_ptp have its own interrupt routine

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Date:   Wed, 1 Nov 2017 10:35:46 -0700
From:   Troy Kisky <troy.kisky@...ndarydevices.com>
To:     Andy Duan <fugang.duan@....com>,
        "shawn.guo@...aro.org" <shawn.guo@...aro.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>
Cc:     Fabio Estevam <fabio.estevam@....com>,
        "lznuaa@...il.com" <lznuaa@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>
Subject: Re: [PATCH net v4 2/2] net: fec: Let fec_ptp have its own interrupt
 routine

On 10/31/2017 7:43 PM, Andy Duan wrote:
> From: Troy Kisky <troy.kisky@...ndarydevices.com> Sent: Wednesday, November 01, 2017 4:17 AM
>> This is better for code locality and should slightly speed up normal interrupts.
>>
>> This also allows PPS clock output to start working for i.mx7. This is because
>> i.mx7 was already using the limit of 3 interrupts, and needed another.
>>
>> Signed-off-by: Troy Kisky <troy.kisky@...ndarydevices.com>
>>
>> ---
>>
>> v2: made this change independent of any devicetree change so that old dtbs
>> continue to work.
>>
>> Continue to register ptp clock if interrupt is not found.
>>
>> v3: renamed "ptp" interrupt to "pps" interrupt
>>
>> v4: no change
>> ---
>> drivers/net/ethernet/freescale/fec.h      |  3 +-
>> drivers/net/ethernet/freescale/fec_main.c | 25 ++++++----
>> drivers/net/ethernet/freescale/fec_ptp.c  | 82 ++++++++++++++++++--------
>> -----
>> 3 files changed, 65 insertions(+), 45 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/freescale/fec.h
>> b/drivers/net/ethernet/freescale/fec.h
>> index ede1876a9a19..be56ac1f1ac4 100644
>> --- a/drivers/net/ethernet/freescale/fec.h
>> +++ b/drivers/net/ethernet/freescale/fec.h
>> @@ -582,12 +582,11 @@ struct fec_enet_private {
>> 	u64 ethtool_stats[0];
>> };
>>
>> -void fec_ptp_init(struct platform_device *pdev);
>> +void fec_ptp_init(struct platform_device *pdev, int irq_index);
> 
> Seems change irq_index to irq_idx much better.


no problem

>> @@ -3465,18 +3463,27 @@ fec_probe(struct platform_device *pdev)
>> 	if (ret)
>> 		goto failed_reset;
>>
>> +	irq_cnt = platform_irq_count(pdev);
>> +	if (irq_cnt > FEC_IRQ_NUM)
>> +		irq_cnt = FEC_IRQ_NUM;	/* last for pps */
>> +	else if (irq_cnt == 2)
>> +		irq_cnt = 1;	/* last for pps */
>> +	else if (irq_cnt <= 0)
>> +		irq_cnt = 1;	/* Let the for loop fail */
>> +
> 
> Do some parse on probe function seems uncomfortable...can you encapsulate these code into one api ?
> 


Do you mean something like
	irq_cnt = limit_irq(pdev);


int limit_irq(struct platform_device *pdev)
{
	int irq_cnt = platform_irq_count(pdev);

	if (irq_cnt > FEC_IRQ_NUM)
		irq_cnt = FEC_IRQ_NUM;	/* last for pps */
	else if (irq_cnt == 2)
		irq_cnt = 1;	/* last for pps */
	else if (irq_cnt <= 0)
		irq_cnt = 1;	/* At least 1 irq is needed */
	return irq_cnt;
}
___________
Can you give some code to your idea? I don't think I understand.


	
> Others seems fine to me.
> Thanks.
>