From mboxrd@z Thu Jan 1 00:00:00 1970 From: b29396@freescale.com (Dong Aisheng) Date: Fri, 20 Jul 2012 17:20:25 +0800 Subject: [PATCH 2/4] ASoC: mxs-saif: set a base clock rate for EXTMASTER mode work In-Reply-To: <1342776027-31758-1-git-send-email-b29396@freescale.com> References: <1342776027-31758-1-git-send-email-b29396@freescale.com> Message-ID: <1342776027-31758-3-git-send-email-b29396@freescale.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Dong Aisheng Set an initial clock rate for the saif internal logic to work properly. This is important when working in EXTMASTER mode that uses the other saif's BITCLK&LRCLK but it still needs a basic clock which should be fast enough for the internal logic. Cc: Mark Brown Cc: Liam Girdwood Cc: Wolfram Sang Cc: Shawn Guo Signed-off-by: Dong Aisheng --- sound/soc/mxs/mxs-saif.c | 16 +++++++++++++++- 1 files changed, 15 insertions(+), 1 deletions(-) diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c index fdbb36a..b303071 100644 --- a/sound/soc/mxs/mxs-saif.c +++ b/sound/soc/mxs/mxs-saif.c @@ -427,8 +427,22 @@ static int mxs_saif_hw_params(struct snd_pcm_substream *substream, /* prepare clk in hw_param, enable in trigger */ clk_prepare(saif->clk); - if (saif != master_saif) + if (saif != master_saif) { + /* + * Set an initial clock rate for the saif internal logic to work + * properly. This is important when working in EXTMASTER mode + * that uses the other saif's BITCLK&LRCLK but it still needs a + * basic clock which should be fast enough for the internal + * logic. + */ + clk_enable(saif->clk); + ret = clk_set_rate(saif->clk, 24000000); + clk_disable(saif->clk); + if (ret) + return ret; + clk_prepare(master_saif->clk); + } scr = __raw_readl(saif->base + SAIF_CTRL); -- 1.7.0.4