linux-kernel - Re: [PATCH 2/4] mfd: twl6030-irq: add error check when IRQs are masked initially

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Message-ID: <51EFBFCC.9060302@ti.com>
Date:	Wed, 24 Jul 2013 14:51:40 +0300
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Graeme Gregory <gg@...mlogic.co.uk>
CC:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Kevin Hilman <khilman@...aro.org>,
	<linux-omap@...r.kernel.org>,
	Ruslan Bilovol <ruslan.bilovol@...com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] mfd: twl6030-irq: add error check when IRQs are masked
 initially

On 07/23/2013 09:08 PM, Graeme Gregory wrote:
> On 23/07/13 17:07, Grygorii Strashko wrote:
>> Add a missed check for errors when TWL IRQs are masked
>> initially on probe and report an error in case of failure.
>>
>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
>> ---
>>   drivers/mfd/twl6030-irq.c |   13 +++++++++----
>>   1 file changed, 9 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/mfd/twl6030-irq.c b/drivers/mfd/twl6030-irq.c
>> index b6030d9..790cc28 100644
>> --- a/drivers/mfd/twl6030-irq.c
>> +++ b/drivers/mfd/twl6030-irq.c
>> @@ -313,7 +313,7 @@ int twl6030_init_irq(struct device *dev, int irq_num)
>>   	struct			device_node *node = dev->of_node;
>>   	int			nr_irqs, irq_base, irq_end;
>>   	static struct irq_chip  twl6030_irq_chip;
>> -	int			status = 0;
>> +	int			status;
>>   	int			i;
>>   	u8			mask[3];
>>
>> @@ -335,11 +335,16 @@ int twl6030_init_irq(struct device *dev, int irq_num)
>>   	mask[2] = 0xFF;
>>
>>   	/* mask all int lines */
>> -	twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_LINE_A, 3);
>> +	status = twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_LINE_A, 3);
>>   	/* mask all int sts */
>> -	twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_STS_A, 3);
>> +	status |= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_STS_A, 3);
>>   	/* clear INT_STS_A,B,C */
>> -	twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_STS_A, 3);
>> +	status |= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_STS_A, 3);
>> +
> You can save two i2c writes here for slightly faster initialisation,
> only one of the REG_INT_STS_A registers needs to be written to clear
> them all. As per the irq handling routine comment.

Good point. thanks

>> +	if (status < 0) {
>> +		dev_err(dev, "I2C err writing TWL_MODULE_PIH: %d\n", status);
>> +		return status;
>> +	}
>>
>>   	twl6030_irq_base = irq_base;
>>
>
> Graeme
>

Regards,
- grygorii
--
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