Re: [PATCH 7/8] ASoC: fsl_spdif: fix struct clk pointer comparing

Shawn Guo
2015-02-26T01:18:07Z

On Wed, Feb 25, 2015 at 01:04:41PM -0800, Stephen Boyd wrote:
> > diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
> > index 75870c0ea2c9..91eb3aef7f02 100644
> > --- a/sound/soc/fsl/fsl_spdif.c
> > +++ b/sound/soc/fsl/fsl_spdif.c
> > @@ -1049,7 +1049,7 @@ static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
> > enum spdif_txrate index, bool round)
> > {
> > const u32 rate[] = { 32000, 44100, 48000, 96000, 192000 };
> > - bool is_sysclk = clk == spdif_priv->sysclk;
> > + bool is_sysclk = clk_is_match(clk, spdif_priv->sysclk);
> > u64 rate_ideal, rate_actual, sub;
> > u32 sysclk_dfmin, sysclk_dfmax;
> > u32 txclk_df, sysclk_df, arate;
> > @@ -1143,7 +1143,7 @@ static int fsl_spdif_probe_txclk(struct fsl_spdif_priv *spdif_priv,
> > spdif_priv->txclk_src[index], rate[index]);
> > dev_dbg(&pdev->dev, "use txclk df %d for %dHz sample rate\n",
> > spdif_priv->txclk_df[index], rate[index]);
> > - if (spdif_priv->txclk[index] == spdif_priv->sysclk)
> > + if (clk_is_match(spdif_priv->txclk[index], spdif_priv->sysclk))
> > dev_dbg(&pdev->dev, "use sysclk df %d for %dHz sample rate\n",
> > spdif_priv->sysclk_df[index], rate[index]);
> > dev_dbg(&pdev->dev, "the best rate for %dHz sample rate is %dHz\n",
>
> Couldn't this be fixed like this?

It could. But this fix is less-intuitive and makes the code change
unnecessarily complex, considering we are introducing helper
clk_is_match() anyway.

Shawn

>
> ----8<----
>
> diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
> index af0429421fc8..1878dd62a247 100644
> --- a/sound/soc/fsl/fsl_spdif.c
> +++ b/sound/soc/fsl/fsl_spdif.c
> @@ -20,6 +20,7 @@
> #include <linux/of_device.h>
> #include <linux/of_irq.h>
> #include <linux/regmap.h>
> +#include <linux/stringify.h>
>
> #include <sound/asoundef.h>
> #include <sound/dmaengine_pcm.h>
> @@ -46,6 +47,8 @@ static u8 srpc_dpll_locked[] = { 0x0, 0x1, 0x2, 0x3, 0x4, 0xa, 0xb };
>
> #define DEFAULT_RXCLK_SRC 1
>
> +#define SYSCLK_NUM 5
> +
> /*
> * SPDIF control structure
> * Defines channel status, subcode and Q sub
> @@ -1051,10 +1054,10 @@ static const struct regmap_config fsl_spdif_regmap_config = {
>
> static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
> struct clk *clk, u64 savesub,
> - enum spdif_txrate index, bool round)
> + enum spdif_txrate index, bool round,
> + bool is_sysclk)
> {
> const u32 rate[] = { 32000, 44100, 48000, 96000, 192000 };
> - bool is_sysclk = clk == spdif_priv->sysclk;
> u64 rate_ideal, rate_actual, sub;
> u32 sysclk_dfmin, sysclk_dfmax;
> u32 txclk_df, sysclk_df, arate;
> @@ -1131,7 +1134,8 @@ static int fsl_spdif_probe_txclk(struct fsl_spdif_priv *spdif_priv,
> continue;
>
> ret = fsl_spdif_txclk_caldiv(spdif_priv, clk, savesub, index,
> - i == STC_TXCLK_SPDIF_ROOT);
> + i == STC_TXCLK_SPDIF_ROOT,
> + i == SYSCLK_NUM);
> if (savesub == ret)
> continue;
>
> @@ -1210,7 +1214,8 @@ static int fsl_spdif_probe(struct platform_device *pdev)
> }
>
> /* Get system clock for rx clock rate calculation */
> - spdif_priv->sysclk = devm_clk_get(&pdev->dev, "rxtx5");
> + spdif_priv->sysclk = devm_clk_get(&pdev->dev,
> + "rxtx" __stringify(SYSCLK_NUM));
> if (IS_ERR(spdif_priv->sysclk)) {
> dev_err(&pdev->dev, "no sys clock (rxtx5) in devicetree\n");
> return PTR_ERR(spdif_priv->sysclk);
>
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project
>