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[216.228.112.21]) by smtp.gmail.com with ESMTPSA id c10sm18237720pfc.62.2020.08.04.01.13.46 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 04 Aug 2020 01:13:46 -0700 (PDT) Date: Tue, 4 Aug 2020 01:13:34 -0700 From: Nicolin Chen To: Shengjiu Wang Cc: Shengjiu Wang , Linux-ALSA , Timur Tabi , Xiubo Li , linuxppc-dev@lists.ozlabs.org, Takashi Iwai , Liam Girdwood , Mark Brown , Fabio Estevam , linux-kernel Subject: Re: [PATCH] ASoC: fsl_sai: Clean code for synchronize mode Message-ID: <20200804081333.GA664@Asurada-Nvidia> References: <20200803215735.GA5461@Asurada-Nvidia> <20200804021114.GA15390@Asurada-Nvidia> <20200804030004.GA27028@Asurada-Nvidia> <20200804070345.GA27658@Asurada-Nvidia> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 04, 2020 at 03:53:51PM +0800, Shengjiu Wang wrote: > > > /* Check if the opposite FRDE is also disabled */ > > > regmap_read(sai->regmap, FSL_SAI_xCSR(!tx, ofs), &xcsr); > > > + if (sai->synchronous[tx] && !sai->synchronous[!tx] && !(xcsr & FSL_SAI_CSR_FRDE)) > > > + fsl_sai_config_disable(sai, !tx); > > > > > + if (sai->synchronous[tx] || !sai->synchronous[!tx] || !(xcsr & FSL_SAI_CSR_FRDE)) > > > + fsl_sai_config_disable(sai, tx); > > > > The first "||" should probably be "&&". > > No. it is !(!sai->synchronous[tx] && sai->synchronous[!tx] && (xcsr & > FSL_SAI_CSR_FRDE)) > so then convert to > (sai->synchronous[tx] || !sai->synchronous[!tx] || !(xcsr & FSL_SAI_CSR_FRDE)) > > if change to &&, then it won't work for: > sai->synchronous[tx] = false, sai->synchronous[!tx]=false. Ahh..probably should be if (!(sync[dir] && !sync[adir]) || !frde) I have a (seemingly) correct version in my sample code. And...please untangle the logic using the given example -- adding helper function(s) and comments. And, though the driver does have places using array[tx] and array[!tx], better not to use any more boolean type variable as an array index, as it's hard to read.