linux-kernel - Re: [alsa-devel] [PATCH 2/2] ASoC: rockchip: i2s: set TDL and RDL to 16 bits

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Message-ID: <549A0A83.7040606@rock-chips.com>
Date:	Wed, 24 Dec 2014 08:36:19 +0800
From:	Jianqun <xjq@...k-chips.com>
To:	Dylan Reid <dgreid@...omium.org>,
	Jianqun Xu <jay.xu@...k-chips.com>
CC:	xjq@...k-chips.com, Liam Girdwood <lgirdwood@...il.com>,
	Heiko Stübner <heiko@...ech.de>,
	Mark Brown <broonie@...nel.org>, perex@...ex.cz,
	Takashi Iwai <tiwai@...e.de>,
	Sonny Rao <sonnyrao@...omium.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [alsa-devel] [PATCH 2/2] ASoC: rockchip: i2s: set TDL and RDL
 to 16 bits

在 12/24/2014 07:06 AM, Dylan Reid 写道:
> On Tue, Dec 23, 2014 at 1:08 AM, Jianqun Xu <jay.xu@...k-chips.com> wrote:
>> Set Transmit Data Level(TDL) and Receive Data Level(RDL) to 16 bits.
>> Without this setting, the TDL is default to be 0x00 (means 1 bit),
>> and the RDL is default to be 0x1f (means 16 bits).
> 
> My impression from the TRM was that TDL and RDL were measured in
> samples.  Are you sure it's 'bits'?
You are right, I'll modify the commit message next version, thank you
> 
>>
>> This patch is helpful to fix pop sound, tested on rk3288 board.
>>
>> Signed-off-by: Jianqun Xu <jay.xu@...k-chips.com>
>> ---
>>  sound/soc/rockchip/rockchip_i2s.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
>> index c74ba37..1cd7efc 100644
>> --- a/sound/soc/rockchip/rockchip_i2s.c
>> +++ b/sound/soc/rockchip/rockchip_i2s.c
>> @@ -247,6 +247,10 @@ static int rockchip_i2s_hw_params(struct snd_pcm_substream *substream,
>>
>>         regmap_update_bits(i2s->regmap, I2S_TXCR, I2S_TXCR_VDW_MASK, val);
>>         regmap_update_bits(i2s->regmap, I2S_RXCR, I2S_RXCR_VDW_MASK, val);
>> +       regmap_update_bits(i2s->regmap, I2S_DMACR, I2S_DMACR_TDL_MASK,
>> +                          I2S_DMACR_TDL(16));
>> +       regmap_update_bits(i2s->regmap, I2S_DMACR, I2S_DMACR_RDL_MASK,
>> +                          I2S_DMACR_RDL(16));
>>
>>         return 0;
>>  }
>> --
>> 1.9.1
>>
>>
>> _______________________________________________
>> Alsa-devel mailing list
>> Alsa-devel@...a-project.org
>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> 
> 
> 

-- 
Jianqun Xu

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