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[216.228.112.22]) by smtp.gmail.com with ESMTPSA id v15sm12187074pff.105.2019.04.20.22.54.09 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 20 Apr 2019 22:54:10 -0700 (PDT) Date: Sat, 20 Apr 2019 22:54:07 -0700 From: Nicolin Chen To: Daniel Baluta Subject: Re: [PATCH 2/2] ASoC: fsl: Move clock operation to PM runtime Message-ID: <20190421055406.GC683@Asurada-Nvidia.nvidia.com> References: <20190420155846.10027-1-daniel.baluta@nxp.com> <20190420155846.10027-3-daniel.baluta@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190420155846.10027-3-daniel.baluta@nxp.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "alsa-devel@alsa-project.org" , "timur@kernel.org" , "Xiubo.Lee@gmail.com" , "linuxppc-dev@lists.ozlabs.org" , "S.j. Wang" , "tiwai@suse.com" , "lgirdwood@gmail.com" , "perex@perex.cz" , "broonie@kernel.org" , dl-linux-imx , "festevam@gmail.com" , "linux-kernel@vger.kernel.org" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Sat, Apr 20, 2019 at 03:59:05PM +0000, Daniel Baluta wrote: > Turn off/on clocks when device enters suspend/resume. This > helps saving power. > @@ -934,6 +933,25 @@ static int fsl_sai_runtime_suspend(struct device *dev) > static int fsl_sai_runtime_resume(struct device *dev) > { > struct fsl_sai *sai = dev_get_drvdata(dev); > + int ret; > + > + ret = clk_prepare_enable(sai->bus_clk); > + if (ret) { > + dev_err(dev, "failed to enable bus clock: %d\n", ret); > + return ret; > + } > + > + if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_PLAYBACK)) { > + ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[1]]); > + if (ret) > + goto disable_bus_clk; > + } > + > + if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE)) { > + ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[0]]); > + if (ret) > + goto disable_tx_clk; > + } The driver only enables mclk_clks for I2S master mode. But this change enables them for I2S slave mode also. It doesn't sound a right thing to me since we are supposed to save power?