From: Fabio Estevam <fabio.estevam@nxp.com> To: Lukasz Majewski <lukma@denx.de>, Timur Tabi <timur@tabi.org>, Nicolin Chen <nicoleotsuka@gmail.com>, Xiubo Li <Xiubo.Lee@gmail.com>, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>, "festevam@gmail.com" <festevam@gmail.com> Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>, "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: Re: [PATCH] sound: soc: fsl: Do not set DAI sysclk when it is equal to system freq Date: Sun, 3 Sep 2017 12:44:17 +0000 [thread overview] Message-ID: <AM5PR0401MB262706674539BFE651706CC6E3900@AM5PR0401MB2627.eurprd04.prod.outlook.com> (raw) In-Reply-To: <1504436701-20700-1-git-send-email-lukma@denx.de> [Sorry for the top-posting] The driver currently has: /* * Hardware limitation: The bclk rate must be * never greater than 1/5 IPG clock rate */ if (freq * 5 > clk_get_rate(ssi_private->clk)) { dev_err(cpu_dai->dev, "bitclk > ipgclk/5\n"); return -EINVAL; } Isn't this properly taking care of the clock restriction? ________________________________ From: Lukasz Majewski <lukma@denx.de> Sent: Sunday, September 3, 2017 8:05:01 AM To: Timur Tabi; Nicolin Chen; Xiubo Li; Fabio Estevam; Liam Girdwood; Mark Brown; Jaroslav Kysela; Takashi Iwai Cc: alsa-devel@alsa-project.org; linuxppc-dev@lists.ozlabs.org; linux-kernel@vger.kernel.org; Lukasz Majewski Subject: [PATCH] sound: soc: fsl: Do not set DAI sysclk when it is equal to system freq The problem is visible in the following setup (on the imx6q): "simple-audio-card" -> ssi2 -> I2S + I2C -> codec The function call log (simple-card probe -> CONFIG_SND_SIMPLE_CARD): asoc_simple_card_init_dai() @ sound/soc/generic/simple-card-utils.c snd_soc_dai_set_sysclk() fsl_ssi_set_dai_sysclk() @ sound/soc/fsl/fsl_ssi.c The last call is changing the bit clock (BCLK) frequency to SSI's IP block clock (ipg = 66 MHz) [1]. This is wrong, since IMX SSI block requires the I2S BCLK to be less than 1/5 of [1]. As a result the driver initialization passes without any errors, but the speaker-test test case breaks. This commit checks if the fsl_ssi_set_dai_sysclk() frequency passed is not equal to [1]. Signed-off-by: Lukasz Majewski <lukma@denx.de> --- sound/soc/fsl/fsl_ssi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c index 173cb84..1186fa9 100644 --- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -809,6 +809,8 @@ static int fsl_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int dir) { struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai); + if (clk_get_rate(ssi_private->clk) == freq) + return 0; ssi_private->bitclk_freq = freq; -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: Fabio Estevam <fabio.estevam@nxp.com> To: Lukasz Majewski <lukma@denx.de>, Timur Tabi <timur@tabi.org>, Nicolin Chen <nicoleotsuka@gmail.com>, Xiubo Li <Xiubo.Lee@gmail.com>, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>, "festevam@gmail.com" <festevam@gmail.com> Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>, "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: Re: [PATCH] sound: soc: fsl: Do not set DAI sysclk when it is equal to system freq Date: Sun, 3 Sep 2017 12:44:17 +0000 [thread overview] Message-ID: <AM5PR0401MB262706674539BFE651706CC6E3900@AM5PR0401MB2627.eurprd04.prod.outlook.com> (raw) In-Reply-To: <1504436701-20700-1-git-send-email-lukma@denx.de> [-- Attachment #1: Type: text/plain, Size: 2150 bytes --] [Sorry for the top-posting] The driver currently has: /* * Hardware limitation: The bclk rate must be * never greater than 1/5 IPG clock rate */ if (freq * 5 > clk_get_rate(ssi_private->clk)) { dev_err(cpu_dai->dev, "bitclk > ipgclk/5\n"); return -EINVAL; } Isn't this properly taking care of the clock restriction? ________________________________ From: Lukasz Majewski <lukma@denx.de> Sent: Sunday, September 3, 2017 8:05:01 AM To: Timur Tabi; Nicolin Chen; Xiubo Li; Fabio Estevam; Liam Girdwood; Mark Brown; Jaroslav Kysela; Takashi Iwai Cc: alsa-devel@alsa-project.org; linuxppc-dev@lists.ozlabs.org; linux-kernel@vger.kernel.org; Lukasz Majewski Subject: [PATCH] sound: soc: fsl: Do not set DAI sysclk when it is equal to system freq The problem is visible in the following setup (on the imx6q): "simple-audio-card" -> ssi2 -> I2S + I2C -> codec The function call log (simple-card probe -> CONFIG_SND_SIMPLE_CARD): asoc_simple_card_init_dai() @ sound/soc/generic/simple-card-utils.c snd_soc_dai_set_sysclk() fsl_ssi_set_dai_sysclk() @ sound/soc/fsl/fsl_ssi.c The last call is changing the bit clock (BCLK) frequency to SSI's IP block clock (ipg = 66 MHz) [1]. This is wrong, since IMX SSI block requires the I2S BCLK to be less than 1/5 of [1]. As a result the driver initialization passes without any errors, but the speaker-test test case breaks. This commit checks if the fsl_ssi_set_dai_sysclk() frequency passed is not equal to [1]. Signed-off-by: Lukasz Majewski <lukma@denx.de> --- sound/soc/fsl/fsl_ssi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c index 173cb84..1186fa9 100644 --- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -809,6 +809,8 @@ static int fsl_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int dir) { struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai); + if (clk_get_rate(ssi_private->clk) == freq) + return 0; ssi_private->bitclk_freq = freq; -- 2.1.4 [-- Attachment #2: Type: text/html, Size: 4079 bytes --]
next prev parent reply other threads:[~2017-09-03 12:44 UTC|newest] Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-09-03 11:05 [PATCH] sound: soc: fsl: Do not set DAI sysclk when it is equal to system freq Lukasz Majewski 2017-09-03 12:44 ` Fabio Estevam [this message] 2017-09-03 12:44 ` Fabio Estevam 2017-09-03 14:40 ` Łukasz Majewski 2017-09-03 15:29 ` Fabio Estevam 2017-09-03 15:29 ` Fabio Estevam 2017-09-03 15:29 ` Fabio Estevam 2017-09-05 5:20 ` Nicolin Chen 2017-09-05 8:35 ` Łukasz Majewski 2017-09-05 18:11 ` Nicolin Chen 2017-09-05 21:13 ` Łukasz Majewski 2017-09-05 21:13 ` Łukasz Majewski 2017-09-05 22:52 ` Nicolin Chen 2017-09-05 22:52 ` Nicolin Chen 2017-09-06 9:22 ` Łukasz Majewski 2017-09-06 9:22 ` Łukasz Majewski 2017-09-06 17:33 ` Nicolin Chen 2017-09-06 17:33 ` Nicolin Chen 2017-09-06 18:35 ` Łukasz Majewski 2017-09-06 19:47 ` Nicolin Chen 2017-09-06 19:47 ` Nicolin Chen 2017-09-06 21:18 ` Łukasz Majewski 2017-09-06 21:18 ` Łukasz Majewski 2017-09-07 23:10 ` Łukasz Majewski 2017-09-07 23:10 ` Łukasz Majewski 2017-09-08 0:39 ` Nicolin Chen 2017-09-08 0:39 ` Nicolin Chen 2017-09-05 23:20 ` Fabio Estevam 2017-09-05 23:20 ` Fabio Estevam 2017-09-05 23:20 ` Fabio Estevam 2017-09-06 8:44 ` Łukasz Majewski 2017-09-05 20:14 ` Fabio Estevam 2017-09-05 20:14 ` Fabio Estevam 2017-09-05 21:14 ` Łukasz Majewski 2017-09-05 5:06 ` Nicolin Chen 2017-09-05 7:37 ` Łukasz Majewski 2017-09-05 7:52 ` Nicolin Chen 2017-09-05 8:19 ` Łukasz Majewski 2017-09-05 8:19 ` Łukasz Majewski 2017-09-05 15:15 ` Mark Brown 2017-09-05 15:15 ` Mark Brown 2017-09-05 17:45 ` Nicolin Chen 2017-09-07 13:44 ` Mark Brown 2017-09-07 13:44 ` Mark Brown 2017-09-07 23:03 ` Nicolin Chen
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