linux-kernel - Re: [PATCH v2] drivers/media/dvb-frontends: Implement probe/remove for stv6110x

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Date:   Wed, 29 May 2019 21:03:33 +0200
From:   Tobias Klausmann <tobias.johannes.klausmann@....thm.de>
To:     Joe Perches <joe@...ches.com>, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, mchehab@...nel.org, sean@...s.org
Subject: Re: [PATCH v2] drivers/media/dvb-frontends: Implement probe/remove
 for stv6110x


On 29.05.19 20:45, Joe Perches wrote:
> On Wed, 2019-05-29 at 18:56 +0200, Tobias Klausmann wrote:
>> Refactor out the common parts of stv6110x_probe() and stv6110x_attach()
>> into separate functions.
>>
>> This provides the needed functionality to use dvb_module_probe() instead
>> of dvb_attach()!
>>
>> v2:
>> - Impovments based on comments by Sean Young
>> - Fix checkpatch.pl --strict errors
> trivia:
>
>> diff --git a/drivers/media/dvb-frontends/stv6110x.c b/drivers/media/dvb-frontends/stv6110x.c
> []
>> @@ -333,6 +333,41 @@ static void stv6110x_release(struct dvb_frontend *fe)
>>   	kfree(stv6110x);
>>   }
>>   
>> +void st6110x_init_regs(struct stv6110x_state *stv6110x)
>> +{
>> +	u8 default_regs[] = {0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e};
> static const u8...
>
>> +
>> +	memcpy(stv6110x->regs, default_regs, 8);
> 	memcpy(stv6110x->regs, default_regs, ARRAY_SIZE(default_regs));
>
>> +}
>> +
>> +void stv6110x_setup_divider(struct stv6110x_state *stv6110x)
>> +{
>> +	switch (stv6110x->config->clk_div) {
>> +	default:
>> +	case 1:
>> +		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
>> +				  CTRL2_CO_DIV,
>> +				  0);
>> +		break;
>> +	case 2:
>> +		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
>> +				  CTRL2_CO_DIV,
>> +				  1);
>> +		break;
>> +	case 4:
>> +		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
>> +				  CTRL2_CO_DIV,
>> +				  2);
>> +		break;
>> +	case 8:
>> +	case 0:
>> +		STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2],
>> +				  CTRL2_CO_DIV,
>> +				  3);
>> +		break;
>> +	}
>> +}
> Probably more sensible (and smaller object code) written using
> an automatic like:
>
> {
> 	int div;
>
> 	switch (stv6110x->config->clk_div) {
> 	case 8:
> 		div = 3;
> 		break;
> 	case 4:
> 		div = 2;
> 		break;
> 	case 2:
> 		div = 1;
> 		break;
> 	case 1:
> 	default:
> 		div = 0;
> 		break;
> 	}
> 	STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, div);
> }
>
>> diff --git a/drivers/media/dvb-frontends/stv6110x_priv.h b/drivers/media/dvb-frontends/stv6110x_priv.h
> []
>> @@ -54,11 +54,12 @@
>>   #define REFCLOCK_MHz				(stv6110x->config->refclk / 1000000)
>>   
>>   struct stv6110x_state {
>> +	struct dvb_frontend		*frontend;
>>   	struct i2c_adapter		*i2c;
>>   	const struct stv6110x_config	*config;
>>   	u8				regs[8];
> Perhaps this 8 should be a define?
>
>

Hi,

thanks for the comments! If really desired i can change the code 
further, adapting to your comments, but note that the code was 
essentially just moved around to cater to both _probe() and attach(), 
intentionally leaving it as it was before the patch!

Greetings,

Tobias