From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nicolin Chen Subject: [PATCH] ASoC: fsl_ssi: Don't try to round-up for PM divisor calculation Date: Sun, 15 Feb 2015 01:37:11 -0800 Message-ID: <1423993031-29474-1-git-send-email-nicoleotsuka@gmail.com> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: broonie@kernel.org Cc: alsa-devel@alsa-project.org, lgirdwood@gmail.com, tiwai@suse.de, perex@perex.cz, linux-kernel@vger.kernel.org, timur@tabi.org, mpa@pengutronix.de, shengjiu.wang@freescale.com, zidan.wang@freescale.com, scerveau@voxtok.com List-Id: alsa-devel@alsa-project.org According to i.MX6 Series Reference Manual, the formula to calculate the sys clock is sysclk rate = bclk rate * (div2 + 1) * (7 * psr + 1) * (pm + 1) * 2 Commit aafa85e71a75 ("ASoC: fsl_ssi: Add DAI master mode support for SSI on i.MX series") added the divisor calculation which relies on the clk_round_rate(). However, at that time, clk_round_rate() didn't provide closest clock rates for some cases because it might not use a correct rounding policy. So using the original formula (pm + 1) for PM divisor was not able to give us a desired clock rate. And then we used (pm + 2) to do the trick. However, the clk-divider driver has been refined a lot since commit b11d282dbea2 ("clk: divider: fix rate calculation for fractional rates") Now using (pm + 2) trick would result an incorrect clock rate. So this patch fixes the problem by removing the useless trick. Reported-by: Stephane Cerveau Signed-off-by: Nicolin Chen --- [ I also checked that only 3.18 stable tree has the refinements for clk-divider driver, so I guess it might not be able to apply to previous long-term trees if being treated as bug fix. -- Nicolin ] sound/soc/fsl/fsl_ssi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c index d7365c5..3e7c644 100644 --- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -603,7 +603,7 @@ static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream, factor = (div2 + 1) * (7 * psr + 1) * 2; for (i = 0; i < 255; i++) { - tmprate = freq * factor * (i + 2); + tmprate = freq * factor * (i + 1); if (baudclk_is_used) clkrate = clk_get_rate(ssi_private->baudclk); -- 1.9.1