linux-kernel - Re: [PATCH v1 1/4] ALSA: hda/cirrus: Add error handling into CS8409 I2C functions

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Date:   Mon, 15 Mar 2021 15:37:32 +0000
From:   Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
To:     Takashi Iwai <tiwai@...e.de>
CC:     <alsa-devel@...a-project.org>, <patches@...nsource.cirrus.com>,
        Stefan Binding <sbinding@...nsource.cirrus.com>,
        Takashi Iwai <tiwai@...e.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/4] ALSA: hda/cirrus: Add error handling into CS8409
 I2C functions

On 15/03/2021 7:45 am, Takashi Iwai wrote:

Hi Takashi,
Thanks a lot for your comments.

> On Sat, 13 Mar 2021 12:34:07 +0100,
> Vitaly Rodionov wrote:
>> @@ -1508,7 +1508,7 @@ static void cs8409_enable_i2c_clock(struct hda_codec *codec, unsigned int flag)
>>   static int cs8409_i2c_wait_complete(struct hda_codec *codec)
>>   {
>>   	int repeat = 5;
>> -	unsigned int retval = 0;
>> +	unsigned int retval;
>>   
>>   	do {
>>   		retval = cs_vendor_coef_get(codec, CIR_I2C_STATUS);
>> @@ -1520,78 +1520,82 @@ static int cs8409_i2c_wait_complete(struct hda_codec *codec)
>>   
>>   	} while (repeat);
>>   
>> -	return repeat > 0 ? 0 : -1;
>> +	return !!repeat;
>>   }
> If the return value of the function has changed, it's nicer to
> comment, e.g. a brief function description would be helpful.
> Also now this looks rather like a bool?
Yes, agreed , we will add comments to describe parameters and return values
>
>
>> @@ -1881,13 +1896,15 @@ static void cs8409_jack_unsol_event(struct hda_codec *codec, unsigned int res)
>>   	reg_hs_status = cs8409_i2c_read(codec, CS42L42_I2C_ADDR, 0x1124, 1);
>>   	reg_ts_status = cs8409_i2c_read(codec, CS42L42_I2C_ADDR, 0x130f, 1);
>>   
>> -	/* Clear interrupts */
>> +	/* Clear interrupts, by reading interrupt status registers */
>>   	cs8409_i2c_read(codec, CS42L42_I2C_ADDR, 0x1b7b, 1);
>> -	cs8409_i2c_read(codec, CS42L42_I2C_ADDR, 0x1308, 1);
>> -	cs8409_i2c_read(codec, CS42L42_I2C_ADDR, 0x130f, 1);
> Why those two calls are removed?
This 2 call are redundant as we already did read these 2 registers in a 
code few lines above.
>
>>   	mutex_unlock(&spec->cs8409_i2c_mux);
>>   
>> +	/* If status values are < 0, read error has occurred. */
>> +	if ((reg_cdc_status < 0) || (reg_hs_status < 0) || (reg_ts_status < 0))
>> +		return;
> Parentheses around the comparison are superfluous, you can remove
> them.
Will fix.
>
> thanks,
>
> Takashi