From: Dong Aisheng <b29396@freescale.com> To: alsa-devel@alsa-project.org Cc: s.hauer@pengutronix.de, broonie@opensource.wolfsonmicro.com, lrg@ti.com, linux-arm-kernel@lists.infradead.org, w.sang@pengutronix.de Subject: [PATCH 1/1] ASoC: mxs-saif: clear clk gate first before register setting Date: Sun, 21 Aug 2011 23:45:40 +0800 [thread overview] Message-ID: <1313941540-20393-1-git-send-email-b29396@freescale.com> (raw) Saif needs clear clk gate first before writing registers or the write will not success. The original xx_get_mclk function clear clk gate after mclk setting that may cause the former mclk setting unwork, then the real output mclk maybe inaccurate. Placing the clear before setting mclk to avoid such an issue. We also have to clear clk gate in startup instead of in prepare function. Signed-off-by: Dong Aisheng <b29396@freescale.com> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Liam Girdwood <lrg@ti.com> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Wolfram Sang <w.sang@pengutronix.de> --- sound/soc/mxs/mxs-saif.c | 22 ++++++++++++---------- 1 files changed, 12 insertions(+), 10 deletions(-) diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c index 0b3adae..530017f 100644 --- a/sound/soc/mxs/mxs-saif.c +++ b/sound/soc/mxs/mxs-saif.c @@ -187,16 +187,20 @@ int mxs_saif_get_mclk(unsigned int saif_id, unsigned int mclk, if (!saif) return -EINVAL; + /* Clear Reset */ + __raw_writel(BM_SAIF_CTRL_SFTRST, + saif->base + SAIF_CTRL + MXS_CLR_ADDR); + + /* FIXME: need clear clk gate for register r/w */ + __raw_writel(BM_SAIF_CTRL_CLKGATE, + saif->base + SAIF_CTRL + MXS_CLR_ADDR); + stat = __raw_readl(saif->base + SAIF_STAT); if (stat & BM_SAIF_STAT_BUSY) { dev_err(saif->dev, "error: busy\n"); return -EBUSY; } - /* Clear Reset */ - __raw_writel(BM_SAIF_CTRL_SFTRST, - saif->base + SAIF_CTRL + MXS_CLR_ADDR); - saif->mclk_in_use = 1; ret = mxs_saif_set_clk(saif, mclk, rate); if (ret) @@ -207,8 +211,6 @@ int mxs_saif_get_mclk(unsigned int saif_id, unsigned int mclk, return ret; /* enable MCLK output */ - __raw_writel(BM_SAIF_CTRL_CLKGATE, - saif->base + SAIF_CTRL + MXS_CLR_ADDR); __raw_writel(BM_SAIF_CTRL_RUN, saif->base + SAIF_CTRL + MXS_SET_ADDR); @@ -303,6 +305,10 @@ static int mxs_saif_startup(struct snd_pcm_substream *substream, __raw_writel(BM_SAIF_CTRL_SFTRST, saif->base + SAIF_CTRL + MXS_CLR_ADDR); + /* clear clock gate */ + __raw_writel(BM_SAIF_CTRL_CLKGATE, + saif->base + SAIF_CTRL + MXS_CLR_ADDR); + return 0; } @@ -379,10 +385,6 @@ static int mxs_saif_prepare(struct snd_pcm_substream *substream, { struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); - /* clear clock gate */ - __raw_writel(BM_SAIF_CTRL_CLKGATE, - saif->base + SAIF_CTRL + MXS_CLR_ADDR); - /* enable FIFO error irqs */ __raw_writel(BM_SAIF_CTRL_FIFO_ERROR_IRQ_EN, saif->base + SAIF_CTRL + MXS_SET_ADDR); -- 1.7.0.4
WARNING: multiple messages have this Message-ID (diff)
From: b29396@freescale.com (Dong Aisheng) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/1] ASoC: mxs-saif: clear clk gate first before register setting Date: Sun, 21 Aug 2011 23:45:40 +0800 [thread overview] Message-ID: <1313941540-20393-1-git-send-email-b29396@freescale.com> (raw) Saif needs clear clk gate first before writing registers or the write will not success. The original xx_get_mclk function clear clk gate after mclk setting that may cause the former mclk setting unwork, then the real output mclk maybe inaccurate. Placing the clear before setting mclk to avoid such an issue. We also have to clear clk gate in startup instead of in prepare function. Signed-off-by: Dong Aisheng <b29396@freescale.com> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Liam Girdwood <lrg@ti.com> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Wolfram Sang <w.sang@pengutronix.de> --- sound/soc/mxs/mxs-saif.c | 22 ++++++++++++---------- 1 files changed, 12 insertions(+), 10 deletions(-) diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c index 0b3adae..530017f 100644 --- a/sound/soc/mxs/mxs-saif.c +++ b/sound/soc/mxs/mxs-saif.c @@ -187,16 +187,20 @@ int mxs_saif_get_mclk(unsigned int saif_id, unsigned int mclk, if (!saif) return -EINVAL; + /* Clear Reset */ + __raw_writel(BM_SAIF_CTRL_SFTRST, + saif->base + SAIF_CTRL + MXS_CLR_ADDR); + + /* FIXME: need clear clk gate for register r/w */ + __raw_writel(BM_SAIF_CTRL_CLKGATE, + saif->base + SAIF_CTRL + MXS_CLR_ADDR); + stat = __raw_readl(saif->base + SAIF_STAT); if (stat & BM_SAIF_STAT_BUSY) { dev_err(saif->dev, "error: busy\n"); return -EBUSY; } - /* Clear Reset */ - __raw_writel(BM_SAIF_CTRL_SFTRST, - saif->base + SAIF_CTRL + MXS_CLR_ADDR); - saif->mclk_in_use = 1; ret = mxs_saif_set_clk(saif, mclk, rate); if (ret) @@ -207,8 +211,6 @@ int mxs_saif_get_mclk(unsigned int saif_id, unsigned int mclk, return ret; /* enable MCLK output */ - __raw_writel(BM_SAIF_CTRL_CLKGATE, - saif->base + SAIF_CTRL + MXS_CLR_ADDR); __raw_writel(BM_SAIF_CTRL_RUN, saif->base + SAIF_CTRL + MXS_SET_ADDR); @@ -303,6 +305,10 @@ static int mxs_saif_startup(struct snd_pcm_substream *substream, __raw_writel(BM_SAIF_CTRL_SFTRST, saif->base + SAIF_CTRL + MXS_CLR_ADDR); + /* clear clock gate */ + __raw_writel(BM_SAIF_CTRL_CLKGATE, + saif->base + SAIF_CTRL + MXS_CLR_ADDR); + return 0; } @@ -379,10 +385,6 @@ static int mxs_saif_prepare(struct snd_pcm_substream *substream, { struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); - /* clear clock gate */ - __raw_writel(BM_SAIF_CTRL_CLKGATE, - saif->base + SAIF_CTRL + MXS_CLR_ADDR); - /* enable FIFO error irqs */ __raw_writel(BM_SAIF_CTRL_FIFO_ERROR_IRQ_EN, saif->base + SAIF_CTRL + MXS_SET_ADDR); -- 1.7.0.4
next reply other threads:[~2011-08-21 15:33 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-08-21 15:45 Dong Aisheng [this message] 2011-08-21 15:45 ` [PATCH 1/1] ASoC: mxs-saif: clear clk gate first before register setting Dong Aisheng 2011-08-22 10:28 ` Liam Girdwood 2011-08-22 10:28 ` Liam Girdwood 2011-08-22 22:34 ` Mark Brown 2011-08-22 22:34 ` Mark Brown
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