linux-kernel - Re: [PATCH 3/5] mfd: atmel-hlcdc: return in case of error

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Message-ID: <99b559e2-4621-dec3-8c6c-b7a36f9ef07e@microchip.com>
Date:   Wed, 11 Dec 2019 12:07:18 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <sam@...nborg.org>
CC:     <alexandre.belloni@...tlin.com>, <bbrezillon@...nel.org>,
        <airlied@...ux.ie>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <Ludovic.Desroches@...rochip.com>,
        <daniel@...ll.ch>, <lee.jones@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/5] mfd: atmel-hlcdc: return in case of error

Hi Sam,

On 10.12.2019 22:37, Sam Ravnborg wrote:
> Hi Claudiu.
> 
> On Tue, Dec 10, 2019 at 03:24:45PM +0200, Claudiu Beznea wrote:
>> For HLCDC timing engine configurations bit ATMEL_HLCDC_SIP of
>> ATMEL_HLCDC_SR needs to checked if it is equal with zero before applying
>> new configuration to timing engine. In case of timeout there is no
>> indicator about this, so, return with error in case of timeout in
>> regmap_atmel_hlcdc_reg_write() and also print a message about this.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
>> ---
>>  drivers/mfd/atmel-hlcdc.c | 14 ++++++++++----
>>  1 file changed, 10 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/mfd/atmel-hlcdc.c b/drivers/mfd/atmel-hlcdc.c
>> index 64013c57a920..19f1dbeb8bcd 100644
>> --- a/drivers/mfd/atmel-hlcdc.c
>> +++ b/drivers/mfd/atmel-hlcdc.c
>> @@ -39,10 +39,16 @@ static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
>>
>>       if (reg <= ATMEL_HLCDC_DIS) {
>>               u32 status;
>> -
>> -             readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
>> -                                       status, !(status & ATMEL_HLCDC_SIP),
>> -                                       1, 100);
>> +             int ret;
>> +
>> +             ret = readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
>> +                                             status,
>> +                                             !(status & ATMEL_HLCDC_SIP),
>> +                                             1, 100);
>> +             if (ret) {
>> +                     pr_err("Timeout waiting for ATMEL_HLCDC_SIP\n");
>> +                     return ret;
> Consider adding device * to atmel_hlcdc_regmap - so you can use
> dev_err() here. This makes it obvious what device this comes from.

OK! I'll do it in v2.

> 
>         Sam
> 
>> +             }
>>       }
>>
>>       writel(val, hregmap->regs + reg);
>> --
>> 2.7.4
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

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