linux-kernel - Re: [PATCH v2 04/16] ASoC: fsl_ssi: Rename fsl_ssi_disable

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Date:   Sun, 14 Jan 2018 16:03:38 -0800
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
Cc:     timur@...i.org, broonie@...nel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, alsa-devel@...a-project.org,
        lgirdwood@...il.com, fabio.estevam@....com, caleb@...me.org,
        arnaud.mouiche@...oxia.com, lukma@...x.de, kernel@...gutronix.de
Subject: Re: [PATCH v2 04/16] ASoC: fsl_ssi: Rename fsl_ssi_disable_val macro

On Sun, Jan 14, 2018 at 11:34:37PM +0100, Maciej S. Szmigiero wrote:

> > +	/* Check if the opposite stream is active */
> > +	aactive = ssi->streams & BIT(!dir);
> 				     ^
> Here an implicit assumption that either RX == 0, TX == 1 or
> RX == 1, TX == 0 still remains.

I would try to get rid of this !dir. However the regvals is
defined as regvals[2] so this assumption (either RX == 0 or
TX == 0) doesn't look wrong to me. I would prefer to add a
comment to limit a potential modification to RX and TX.