linux-kernel - [PATCH] ASoC: fsl_spdif: Don't try to round-up for clock divisor calculation

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Date:	Sun, 24 May 2015 01:12:41 -0700
From:	Nicolin Chen <nicoleotsuka@...il.com>
To:	broonie@...nel.org
Cc:	alsa-devel@...a-project.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, lgirdwood@...il.com,
	fabio.estevam@...escale.com, zidan.wang@...escale.com
Subject: [PATCH] ASoC: fsl_spdif: Don't try to round-up for clock divisor calculation

As commit 6c8ca30eec7b ("ASoC: fsl_ssi: Don't try to round-up for PM
divisor calculation") mentioned that there's no more need to use a
round up work around to get a better divisor since the clk-divider
driver has been refined a lot.

So this patch applies the same modification to fsl_spdif driver.

Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
Cc: Fabio Estevam <fabio.estevam@...escale.com>
Cc: Zidan Wang <zidan.wang@...escale.com>
---

Fabio and Zidan,
Theoretically, it should have the same problem as fsl_ssi driver had.
But I don't have an S/PDIF test environment. So I need your helps to
confirm it. Thank you.

 sound/soc/fsl/fsl_spdif.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
index 91eb3ae..8e93221 100644
--- a/sound/soc/fsl/fsl_spdif.c
+++ b/sound/soc/fsl/fsl_spdif.c
@@ -417,11 +417,9 @@ static int spdif_set_sample_rate(struct snd_pcm_substream *substream,
 	if (clk != STC_TXCLK_SPDIF_ROOT)
 		goto clk_set_bypass;
 
-	/*
-	 * The S/PDIF block needs a clock of 64 * fs * txclk_df.
-	 * So request 64 * fs * (txclk_df + 1) to get rounded.
-	 */
-	ret = clk_set_rate(spdif_priv->txclk[rate], 64 * sample_rate * (txclk_df + 1));
+	/* The S/PDIF block needs a clock of 64 * fs * txclk_df */
+	ret = clk_set_rate(spdif_priv->txclk[rate],
+			   64 * sample_rate * txclk_df);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to set tx clock rate\n");
 		return ret;
@@ -1060,7 +1058,7 @@ static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
 
 	for (sysclk_df = sysclk_dfmin; sysclk_df <= sysclk_dfmax; sysclk_df++) {
 		for (txclk_df = 1; txclk_df <= 128; txclk_df++) {
-			rate_ideal = rate[index] * (txclk_df + 1) * 64;
+			rate_ideal = rate[index] * txclk_df * 64;
 			if (round)
 				rate_actual = clk_round_rate(clk, rate_ideal);
 			else
-- 
1.9.1

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