From patchwork Fri Mar 15 11:27:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bastien Curutchet X-Patchwork-Id: 13593320 Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 738921BDD0; Fri, 15 Mar 2024 11:28:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.196 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710502086; cv=none; b=BuHqAyotChp06Eyq5i6+JmiFP54JUEYXvYE6jmdZDxPcDw/4J0tJlL6BankpHIYC8gIFYVkd2EpUQpzoWQKQTxvKXvDILrYDue9nUCcCsfTeMfv9Ngo7oY4al4FDyO/u5iwoc+5TX1j6TfdHaZ6hVdSdsTdsB7rar8rm0probTs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710502086; c=relaxed/simple; bh=/9MOC//4icL1mkYY+3/MDt3RrV6Xiz5zG1bPwSLg9DQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kaEhYKswT37ttY4E/UcAmVHKK3Sq4J3L1GrZXP7TGZG/U0Ff1BEdLwer6mKIj/Y2Fch6lqL2vmamdc0gHc4pq3sbpjTcyv236GbM385AVAYqXjyr6r8jKtRKWSXr5JPjejQZ9pg6C9RB65wScfN3K7ryuLXoQzTk5PNLN/puvlk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=S/51PEpq; arc=none smtp.client-ip=217.70.183.196 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="S/51PEpq" Received: by mail.gandi.net (Postfix) with ESMTPA id ECB08E0003; Fri, 15 Mar 2024 11:28:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1710502081; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=D3k3C45wOf7UbcUd/6RBltZ20s6UElfnsHBgrHpSOQU=; b=S/51PEpqCZN+wUtFuSRm8pBQFVPcY4BLnwaNB4mNSnKqSQuUVtYMmdPYCJpXnkOPN6YaQk f+uQwYZFAFeNgP3Ov59dvGIeCvlLFlweA+YME59kcybf5I0ITaJPkz36wtf0d4hRz1Iond ydvtUD4grsItd54pKEoW7m2XWLQwPzzNjdmFAmvUZEz16tF62QA6nKNZtaOeFuObpANwmw P5ZsQ3vWWebLivXpCYsRzQqkbrVjl++5FtMhg5h4qMbsd8hQo2uFP//i7Ft3QSFE+ohqlG ZrkNXm3I1wVPiZ5DXqzF6woHCP0+lWJnLcyRn9MY+lw6LAJJ3ERDnrup3Pj5jg== From: Bastien Curutchet To: Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Peter Ujfalusi , Jaroslav Kysela , Takashi Iwai , Bastien Curutchet Cc: linux-sound@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org, Thomas Petazzoni , herve.codina@bootlin.com, christophercordahi@nanometrics.ca Subject: [PATCH 05/13] ASoC: ti: davinci-i2s: Use external clock to drive sample rate generator Date: Fri, 15 Mar 2024 12:27:37 +0100 Message-ID: <20240315112745.63230-6-bastien.curutchet@bootlin.com> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240315112745.63230-1-bastien.curutchet@bootlin.com> References: <20240315112745.63230-1-bastien.curutchet@bootlin.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-GND-Sasl: bastien.curutchet@bootlin.com McBSP's internal sample rate generator can be programed to be driven by its internal clock or by an external clock source located on CLKS pin. The external clock source case is not handled by the driver. Handle an optional clock related to this external clock source. If present, the driver uses the clock located on CLKS pin as input for the sample rate generator. Thus, the external clock rate is used to compute divisors. If this optional clock is not present, the sample rate generator is driven by the McBSP's functional clock. Signed-off-by: Bastien Curutchet --- sound/soc/ti/davinci-i2s.c | 65 ++++++++++++++++++++++++++++---------- 1 file changed, 49 insertions(+), 16 deletions(-) diff --git a/sound/soc/ti/davinci-i2s.c b/sound/soc/ti/davinci-i2s.c index 4cb3ef62db20..8ee22d79b0f4 100644 --- a/sound/soc/ti/davinci-i2s.c +++ b/sound/soc/ti/davinci-i2s.c @@ -134,6 +134,7 @@ struct davinci_mcbsp_dev { int mode; u32 pcr; struct clk *clk; + struct clk *ext_clk; /* * Combining both channels into 1 element will at least double the * amount of time between servicing the dma channel, increase @@ -364,7 +365,8 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream, struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai); struct snd_interval *i = NULL; int mcbsp_word_length, master; - unsigned int rcr, xcr, srgr, clk_div, freq, framesize; + unsigned int rcr, xcr, clk_div, freq, framesize; + unsigned int srgr = 0; u32 spcr; snd_pcm_format_t fmt; unsigned element_cnt = 1; @@ -385,9 +387,13 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream, switch (master) { case SND_SOC_DAIFMT_BP_FP: - freq = clk_get_rate(dev->clk); - srgr = DAVINCI_MCBSP_SRGR_FSGM | - DAVINCI_MCBSP_SRGR_CLKSM; + if (dev->ext_clk) { + freq = clk_get_rate(dev->ext_clk); + } else { + freq = clk_get_rate(dev->clk); + srgr = DAVINCI_MCBSP_SRGR_CLKSM; + } + srgr |= DAVINCI_MCBSP_SRGR_FSGM; srgr |= DAVINCI_MCBSP_SRGR_FWID(mcbsp_word_length * 8 - 1); if (dev->i2s_accurate_sck) { @@ -688,12 +694,36 @@ static int davinci_i2s_probe(struct platform_device *pdev) return dev_err_probe(&pdev->dev, -ENODEV, "Missing DMA rx resource\n"); } - dev->clk = clk_get(&pdev->dev, NULL); + /* + * The optional is there for backward compatibility. + * If 'fck' is not present, the clk_get(dev, NULL) that follows may find something + */ + dev->clk = devm_clk_get_optional(&pdev->dev, "fck"); if (IS_ERR(dev->clk)) - return -ENODEV; - ret = clk_enable(dev->clk); + return dev_err_probe(&pdev->dev, PTR_ERR(dev->clk), "Invalid functional clock\n"); + if (!dev->clk) { + dev->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(dev->clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(dev->clk), + "Missing functional clock\n"); + } + + dev->ext_clk = devm_clk_get_optional(&pdev->dev, "clks"); + if (IS_ERR(dev->ext_clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(dev->ext_clk), "Invalid external clock\n"); + + ret = clk_prepare_enable(dev->clk); if (ret) - goto err_put_clk; + return ret; + + if (dev->ext_clk) { + dev_dbg(&pdev->dev, "External clock used for sample rate generator\n"); + ret = clk_prepare_enable(dev->ext_clk); + if (ret) { + dev_err_probe(&pdev->dev, ret, "Failed to enable external clock\n"); + goto err_disable_clk; + } + } dev->dev = &pdev->dev; dev_set_drvdata(&pdev->dev, dev); @@ -701,7 +731,7 @@ static int davinci_i2s_probe(struct platform_device *pdev) ret = snd_soc_register_component(&pdev->dev, &davinci_i2s_component, &davinci_i2s_dai, 1); if (ret != 0) - goto err_release_clk; + goto err_disable_ext_clk; ret = edma_pcm_platform_register(&pdev->dev); if (ret) { @@ -713,10 +743,12 @@ static int davinci_i2s_probe(struct platform_device *pdev) err_unregister_component: snd_soc_unregister_component(&pdev->dev); -err_release_clk: - clk_disable(dev->clk); -err_put_clk: - clk_put(dev->clk); +err_disable_ext_clk: + if (dev->ext_clk) + clk_disable_unprepare(dev->ext_clk); +err_disable_clk: + clk_disable_unprepare(dev->clk); + return ret; } @@ -726,9 +758,10 @@ static void davinci_i2s_remove(struct platform_device *pdev) snd_soc_unregister_component(&pdev->dev); - clk_disable(dev->clk); - clk_put(dev->clk); - dev->clk = NULL; + clk_disable_unprepare(dev->clk); + + if (dev->ext_clk) + clk_disable_unprepare(dev->ext_clk); } static const struct of_device_id davinci_i2s_match[] __maybe_unused = {