linux-kernel - Re: [PATCH 4/5] ASoC: rockchip-i2s: fix registers' property of rockchip i2s controller

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Message-ID: <5414FD6E.2050006@rock-chips.com>
Date:	Sun, 14 Sep 2014 10:29:02 +0800
From:	Jianqun <xjq@...k-chips.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Jianqun <jay.xu@...k-chips.com>, heiko@...ech.de,
	lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
	tiwai@...e.de, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org
CC:	huangtao@...k-chips.com, cf@...k-chips.com
Subject: Re: [PATCH 4/5] ASoC: rockchip-i2s: fix registers' property of rockchip
 i2s controller



在 09/14/2014 04:57 AM, Sergei Shtylyov 写道:
> Hello.
> 
> On 9/13/2014 3:42 AM, Jianqun wrote:
> 
>> Reference rockchip I2S controller TRM, modify some registers' property
>> I2S_FIFOLR: read / write, but not volatile, not precious
>> I2S_INTSR: read / write
>> I2S_CLR: volatile, register value will be cleared by read
> 
>> Test on RK3288 with max98090.
> 
>> Signed-off-by: Jianqun Xu <jay.xu@...k-chips.com>
>> ---
>>   sound/soc/rockchip/rockchip_i2s.c | 6 +++---
>>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
>> diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
>> index 1b9b404..6595383 100644
>> --- a/sound/soc/rockchip/rockchip_i2s.c
>> +++ b/sound/soc/rockchip/rockchip_i2s.c
> [...]
>> @@ -385,8 +387,6 @@ static bool rockchip_i2s_volatile_reg(struct device *dev, unsigned int reg)
>>   static bool rockchip_i2s_precious_reg(struct device *dev, unsigned int reg)
>>   {
>>       switch (reg) {
>> -    case I2S_FIFOLR:
>> -        return true;
>>       default:
>>           return false;
>>       }
> 
>    Shouldn't this be folded into simple *return* false now?
That is more reasonable, thank you.
> 
> WBR, Sergei
> 
> 
> 
> 
> 
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