From cbaadf0f90d6d406a36bb389fbdea524d6d89d8d Mon Sep 17 00:00:00 2001 From: Bo Shen Date: Fri, 30 Jan 2015 17:38:43 +0800 Subject: [PATCH] ASoC: atmel_ssc_dai: refactor the startup and shutdown In startup function, enable ssc clock and in shutdown function, disable clock. And also remove disable ssc in shutdown function, as ssc is disabled in prepare function. Signed-off-by: Bo Shen Signed-off-by: Mark Brown --- sound/soc/atmel/atmel_ssc_dai.c | 28 +++++++++++----------------- 1 file changed, 11 insertions(+), 17 deletions(-) diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c index f55f3aab8bdd..76a9754370e8 100644 --- a/sound/soc/atmel/atmel_ssc_dai.c +++ b/sound/soc/atmel/atmel_ssc_dai.c @@ -204,6 +204,13 @@ static int atmel_ssc_startup(struct snd_pcm_substream *substream, pr_debug("atmel_ssc_startup: SSC_SR=0x%u\n", ssc_readl(ssc_p->ssc->regs, SR)); + /* Enable PMC peripheral clock for this SSC */ + pr_debug("atmel_ssc_dai: Starting clock\n"); + clk_enable(ssc_p->ssc->clk); + + /* Reset the SSC to keep it at a clean status */ + ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST)); + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { dir = 0; dir_mask = SSC_DIR_MASK_PLAYBACK; @@ -250,11 +257,6 @@ static void atmel_ssc_shutdown(struct snd_pcm_substream *substream, dma_params = ssc_p->dma_params[dir]; if (dma_params != NULL) { - ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable); - pr_debug("atmel_ssc_shutdown: %s disabled SSC_SR=0x%08x\n", - (dir ? "receive" : "transmit"), - ssc_readl(ssc_p->ssc->regs, SR)); - dma_params->ssc = NULL; dma_params->substream = NULL; ssc_p->dma_params[dir] = NULL; @@ -266,10 +268,6 @@ static void atmel_ssc_shutdown(struct snd_pcm_substream *substream, ssc_p->dir_mask &= ~dir_mask; if (!ssc_p->dir_mask) { if (ssc_p->initialized) { - /* Shutdown the SSC clock. */ - pr_debug("atmel_ssc_dai: Stopping clock\n"); - clk_disable(ssc_p->ssc->clk); - free_irq(ssc_p->ssc->irq, ssc_p); ssc_p->initialized = 0; } @@ -280,6 +278,10 @@ static void atmel_ssc_shutdown(struct snd_pcm_substream *substream, ssc_p->cmr_div = ssc_p->tcmr_period = ssc_p->rcmr_period = 0; } spin_unlock_irq(&ssc_p->lock); + + /* Shutdown the SSC clock. */ + pr_debug("atmel_ssc_dai: Stopping clock\n"); + clk_disable(ssc_p->ssc->clk); } @@ -625,14 +627,6 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream, rcmr, rfmr, tcmr, tfmr); if (!ssc_p->initialized) { - - /* Enable PMC peripheral clock for this SSC */ - pr_debug("atmel_ssc_dai: Starting clock\n"); - clk_enable(ssc_p->ssc->clk); - - /* Reset the SSC and its PDC registers */ - ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST)); - ssc_writel(ssc_p->ssc->regs, PDC_RPR, 0); ssc_writel(ssc_p->ssc->regs, PDC_RCR, 0); ssc_writel(ssc_p->ssc->regs, PDC_RNPR, 0); -- 2.20.1