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Thu, 13 May 2021 11:45:55 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 64472C43460; Thu, 13 May 2021 11:45:55 +0000 (UTC) Received: from hyd-lnxbld210.qualcomm.com (unknown [202.46.22.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: srivasam) by smtp.codeaurora.org (Postfix) with ESMTPSA id 1220EC433F1; Thu, 13 May 2021 11:45:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 1220EC433F1 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=srivasam@codeaurora.org From: Srinivasa Rao Mandadapu To: agross@kernel.org, bjorn.andersson@linaro.org, lgirdwood@gmail.com, broonie@kernel.org, robh+dt@kernel.org, plai@codeaurora.org, bgoswami@codeaurora.org, perex@perex.cz, tiwai@suse.com, srinivas.kandagatla@linaro.org, rohitkr@codeaurora.org, linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, swboyd@chromium.org, judyhsiao@chromium.org Subject: [PATCH] ASoC: qcom: lpass-cpu: Fix pop noise during audio capture begin Date: Thu, 13 May 2021 17:15:39 +0530 Message-Id: <20210513114539.4813-1-srivasam@codeaurora.org> X-Mailer: git-send-email 2.29.0 MIME-Version: 1.0 Cc: Srinivasa Rao Mandadapu X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" This patch fixes PoP noise of around 15ms observed during audio capture begin. Enables BCLK and LRCLK in snd_soc_dai_ops startup call for introducing some delay before capture start and clock enable. Signed-off-by: Judy Hsiao Signed-off-by: Srinivasa Rao Mandadapu --- sound/soc/qcom/lpass-cpu.c | 37 +++++++++++++++++++++++++++++++++---- 1 file changed, 33 insertions(+), 4 deletions(-) diff --git a/sound/soc/qcom/lpass-cpu.c b/sound/soc/qcom/lpass-cpu.c index c62d2612e8f5..3dcfc2f115a7 100644 --- a/sound/soc/qcom/lpass-cpu.c +++ b/sound/soc/qcom/lpass-cpu.c @@ -73,14 +73,28 @@ static int lpass_cpu_daiops_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai); - int ret; + struct lpaif_i2sctl *i2sctl = drvdata->i2sctl; + unsigned int id = dai->driver->id; + int ret = -EINVAL; ret = clk_prepare_enable(drvdata->mi2s_osr_clk[dai->driver->id]); if (ret) { dev_err(dai->dev, "error in enabling mi2s osr clk: %d\n", ret); return ret; } - ret = clk_prepare(drvdata->mi2s_bit_clk[dai->driver->id]); + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + ret = regmap_fields_write(i2sctl->spken, id, + LPAIF_I2SCTL_SPKEN_ENABLE); + } else { + ret = regmap_fields_write(i2sctl->micen, id, + LPAIF_I2SCTL_MICEN_ENABLE); + } + if (ret) + dev_err(dai->dev, "error writing to i2sctl reg: %d\n", + ret); + + ret = clk_prepare_enable(drvdata->mi2s_bit_clk[dai->driver->id]); if (ret) { dev_err(dai->dev, "error in enabling mi2s bit clk: %d\n", ret); clk_disable_unprepare(drvdata->mi2s_osr_clk[dai->driver->id]); @@ -93,9 +107,23 @@ static void lpass_cpu_daiops_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai); + struct lpaif_i2sctl *i2sctl = drvdata->i2sctl; + unsigned int id = dai->driver->id; + int ret = -EINVAL; clk_disable_unprepare(drvdata->mi2s_osr_clk[dai->driver->id]); - clk_unprepare(drvdata->mi2s_bit_clk[dai->driver->id]); + clk_disable_unprepare(drvdata->mi2s_bit_clk[dai->driver->id]); + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + ret = regmap_fields_write(i2sctl->spken, id, + LPAIF_I2SCTL_SPKEN_DISABLE); + } else { + ret = regmap_fields_write(i2sctl->micen, id, + LPAIF_I2SCTL_MICEN_DISABLE); + } + if (ret) + dev_err(dai->dev, "error writing to i2sctl reg: %d\n", + ret); } static int lpass_cpu_daiops_hw_params(struct snd_pcm_substream *substream, @@ -308,7 +336,8 @@ static int lpass_cpu_daiops_trigger(struct snd_pcm_substream *substream, ret); clk_disable(drvdata->mi2s_bit_clk[dai->driver->id]); - + break; + default: break; }