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Message-ID: <20140915135204.GF8844@pengutronix.de>
Date: Mon, 15 Sep 2014 15:52:04 +0200
From: Markus Pargmann <mpa@...gutronix.de>
To: Shengjiu Wang <shengjiu.wang@...escale.com>
Cc: timur@...i.org, nicoleotsuka@...il.com, Li.Xiubo@...escale.com,
lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
tiwai@...e.de, alsa-devel@...a-project.org,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] ASoC: fsl_ssi: refine ipg clock usage in this module
On Mon, Sep 15, 2014 at 06:37:15PM +0800, Shengjiu Wang wrote:
> On Mon, Sep 15, 2014 at 12:32:13PM +0200, Markus Pargmann wrote:
> > On Mon, Sep 15, 2014 at 06:22:27PM +0800, Shengjiu Wang wrote:
> > > On Mon, Sep 15, 2014 at 12:05:41PM +0200, Markus Pargmann wrote:
> > > > On Fri, Sep 12, 2014 at 06:35:15PM +0800, Shengjiu Wang wrote:
> > > > > Check if ipg clock is in clock-names property, then we can move the
> > > > > ipg clock enable and disable operation to startup and shutdown, that
> > > > > is only enable ipg clock when ssi is working and keep clock is disabled
> > > > > when ssi is in idle.
> > > > > But when the checking is failed, remain the clock control as before.
> > > > >
> > > > > Signed-off-by: Shengjiu Wang <shengjiu.wang@...escale.com>
> > > > > ---
> > > > > V3 change log:
> > > > > update patch according Nicolin and markus's comments
> > > > >
> > > > >
> > > > > sound/soc/fsl/fsl_ssi.c | 53 ++++++++++++++++++++++++++++++++++++++++-------
> > > > > 1 file changed, 45 insertions(+), 8 deletions(-)
> > > > >
> > > > > diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
> > > > > index 2fc3e66..6d1dfd5 100644
> > > > > --- a/sound/soc/fsl/fsl_ssi.c
> > > > > +++ b/sound/soc/fsl/fsl_ssi.c
> > > > > @@ -169,6 +169,7 @@ struct fsl_ssi_private {
> > > > > u8 i2s_mode;
> > > > > bool use_dma;
> > > > > bool use_dual_fifo;
> > > > > + bool has_ipg_clk_name;
> > > > > unsigned int fifo_depth;
> > > > > struct fsl_ssi_rxtx_reg_val rxtx_reg_val;
> > > > >
> > > > > @@ -530,6 +531,11 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream,
> > > > > struct snd_soc_pcm_runtime *rtd = substream->private_data;
> > > > > struct fsl_ssi_private *ssi_private =
> > > > > snd_soc_dai_get_drvdata(rtd->cpu_dai);
> > > > > + int ret;
> > > > > +
> > > > > + ret = clk_prepare_enable(ssi_private->clk);
> > > > > + if (ret)
> > > > > + return ret;
> > > > >
> > > > > /* When using dual fifo mode, it is safer to ensure an even period
> > > > > * size. If appearing to an odd number while DMA always starts its
> > > > > @@ -544,6 +550,21 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream,
> > > > > }
> > > > >
> > > > > /**
> > > > > + * fsl_ssi_shutdown: shutdown the SSI
> > > > > + *
> > > > > + */
> > > > > +static void fsl_ssi_shutdown(struct snd_pcm_substream *substream,
> > > > > + struct snd_soc_dai *dai)
> > > > > +{
> > > > > + struct snd_soc_pcm_runtime *rtd = substream->private_data;
> > > > > + struct fsl_ssi_private *ssi_private =
> > > > > + snd_soc_dai_get_drvdata(rtd->cpu_dai);
> > > > > +
> > > > > + clk_disable_unprepare(ssi_private->clk);
> > > > > +
> > > > > +}
> > > > > +
> > > > > +/**
> > > > > * fsl_ssi_set_bclk - configure Digital Audio Interface bit clock
> > > > > *
> > > > > * Note: This function can be only called when using SSI as DAI master
> > > > > @@ -1043,6 +1064,7 @@ static int fsl_ssi_dai_probe(struct snd_soc_dai *dai)
> > > > >
> > > > > static const struct snd_soc_dai_ops fsl_ssi_dai_ops = {
> > > > > .startup = fsl_ssi_startup,
> > > > > + .shutdown = fsl_ssi_shutdown,
> > > > > .hw_params = fsl_ssi_hw_params,
> > > > > .hw_free = fsl_ssi_hw_free,
> > > > > .set_fmt = fsl_ssi_set_dai_fmt,
> > > > > @@ -1168,17 +1190,22 @@ static int fsl_ssi_imx_probe(struct platform_device *pdev,
> > > > > u32 dmas[4];
> > > > > int ret;
> > > > >
> > > > > - ssi_private->clk = devm_clk_get(&pdev->dev, NULL);
> > > > > + if (ssi_private->has_ipg_clk_name)
> > > > > + ssi_private->clk = devm_clk_get(&pdev->dev, "ipg");
> > > > > + else
> > > > > + ssi_private->clk = devm_clk_get(&pdev->dev, NULL);
> > > > > if (IS_ERR(ssi_private->clk)) {
> > > > > ret = PTR_ERR(ssi_private->clk);
> > > > > dev_err(&pdev->dev, "could not get clock: %d\n", ret);
> > > > > return ret;
> > > > > }
> > > > >
> > > > > - ret = clk_prepare_enable(ssi_private->clk);
> > > > > - if (ret) {
> > > > > - dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret);
> > > > > - return ret;
> > > > > + if (!ssi_private->has_ipg_clk_name) {
> > > > > + ret = clk_prepare_enable(ssi_private->clk);
> > > > > + if (ret) {
> > > > > + dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret);
> > > > > + return ret;
> > > > > + }
> > > > > }
> > > > >
> > > > > /* For those SLAVE implementations, we ingore non-baudclk cases
> > > > > @@ -1236,8 +1263,9 @@ static int fsl_ssi_imx_probe(struct platform_device *pdev,
> > > > > return 0;
> > > > >
> > > > > error_pcm:
> > > > > - clk_disable_unprepare(ssi_private->clk);
> > > > >
> > > > > + if (!ssi_private->has_ipg_clk_name)
> > > > > + clk_disable_unprepare(ssi_private->clk);
> > > > > return ret;
> > > > > }
> > > > >
> > > > > @@ -1246,7 +1274,8 @@ static void fsl_ssi_imx_clean(struct platform_device *pdev,
> > > > > {
> > > > > if (!ssi_private->use_dma)
> > > > > imx_pcm_fiq_exit(pdev);
> > > > > - clk_disable_unprepare(ssi_private->clk);
> > > > > + if (!ssi_private->has_ipg_clk_name)
> > > > > + clk_disable_unprepare(ssi_private->clk);
> > > > > }
> > > > >
> > > > > static int fsl_ssi_probe(struct platform_device *pdev)
> > > > > @@ -1321,8 +1350,16 @@ static int fsl_ssi_probe(struct platform_device *pdev)
> > > > > return -ENOMEM;
> > > > > }
> > > > >
> > > > > - ssi_private->regs = devm_regmap_init_mmio(&pdev->dev, iomem,
> > > > > + ret = of_property_match_string(np, "clock-names", "ipg");
> > > > > + if (ret < 0) {
> > > > > + ssi_private->has_ipg_clk_name = false;
> > > > > + ssi_private->regs = devm_regmap_init_mmio(&pdev->dev, iomem,
> > > > > &fsl_ssi_regconfig);
> > > >
> > > > Sorry if I was unclear about that. My suggestion was to enable the clock
> > > > right here:
> > > > clk_prepare_enable(ssi_private->clk);
> > > >
> > > > Then you can remove ssi_private->has_ipg_clk_name and all
> > > > clk_prepare_enable() and clk_disable_unprepare() from above. Also you
> > > > can move the devm_clk_get() into this block.
> > > >
> > >
> > > ipg clock not only need to be enabled when accessing register, but also
> > > need to be enabled when ssi is working. So I add clk_enable in startup.
> > >
> > > > It seems you really want to implement this for devicetrees where the
> > > > "ipg" clock-name is missing, but I don't understand why? I really can't
> > > > see any benefit of adding all these clk_prepare_enable() calls for all
> > > > cornercases that may occure. For example the clocks for AC97 are still
> > > > missing in this version.
> > >
> > > When ipg clock-name is missing, I just remain the code logic as before.
> > > So AC97 case is same as before too.
> > > When have ipg clock-name, register it to regmap for accessing register,
> > > and enabling ipg clock in startup also is useful for AC97.
> > >
> > > I don't understand why you think clock for AC97 is still missing?
> >
> > Sorry got it all wrong, monday morning tiredness perhaps ;-).
> >
> > The patch looks good for me at the second look. I will test it later
> > today and give you feedback.
> >
> > Best regards,
> >
> > Markus
>
> Thank you very much. Your comments help me a lot. and wait your feedback.
Okay, I tested this patch on imx53-qsb with and without the "ipg"
clock-name. Both worked, so:
Tested-by: Markus Pargmann <mpa@...gutronix.de>
I noticed that checkpatch shows two minor style issues. It would be good
if you could fix them.
Best regards,
Markus
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