linux-kernel - Re: [alsa-devel][PATCH 3/3] ASoC: fsl

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Message-ID: <20150122054636.GB7748@Asurada>
Date:	Wed, 21 Jan 2015 21:46:37 -0800
From:	Nicolin Chen <nicoleotsuka@...il.com>
To:	Zidan Wang <b50113@...escale.com>
Cc:	Zidan Wang <zidan.wang@...escale.com>, timur@...i.org,
	Xiubo.Lee@...il.com, lgirdwood@...il.com, broonie@...nel.org,
	perex@...ex.cz, tiwai@...e.de, alsa-devel@...a-project.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel][PATCH 3/3] ASoC: fsl_sai: Add support for Right-J
 mode

On Thu, Jan 22, 2015 at 01:13:46PM +0800, Zidan Wang wrote:
> On Wed, Jan 21, 2015 at 10:53:20AM -0800, Nicolin Chen wrote:
> > On Tue, Jan 20, 2015 at 08:21:20PM +0800, Zidan Wang wrote:
> > > Add Right-J mode and set TCR5 FBT bit to let data right justify.
> > > 
> > > Signed-off-by: Zidan Wang <zidan.wang@...escale.com>
> > 
> > > -	if (sai->is_lsb_first)
> > > +	if (sai->is_lsb_first && sai->is_right_j_mode)
> > >  		val_cr5 |= FSL_SAI_CR5_FBT(0);
> > 
> > Are you sure that FBT(0) is correct for right justified mode?
> > Because the original code is using FBT(0) for the lsb_first
> > situation and it shouldn't be right justified mode as default.
> >
> I am not sure about that. 
> 
> I assume lsb_first as big endian data.

Correct.

> For 16 bit data format, the 2 bytes data will in high address of 4 bytes
> fifo. So the FBT is 16 for left-j and 0 for right-j. But big endian is
> bytes convert not bits convert. It makes me confuse. And send to
> community for help.

Either waiting for Xiubo to test it or asking IC owner for help.

Nicolin
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