diff options
| -rw-r--r-- | Documentation/devicetree/bindings/sound/davinci-evm-audio.txt | 9 | ||||
| -rw-r--r-- | sound/soc/davinci/davinci-evm.c | 58 | ||||
| -rw-r--r-- | sound/soc/davinci/davinci-mcasp.c | 20 |
3 files changed, 84 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/sound/davinci-evm-audio.txt b/Documentation/devicetree/bindings/sound/davinci-evm-audio.txt index 865178d5cdf3..963e100514c2 100644 --- a/Documentation/devicetree/bindings/sound/davinci-evm-audio.txt +++ b/Documentation/devicetree/bindings/sound/davinci-evm-audio.txt @@ -5,12 +5,19 @@ Required properties: - ti,model : The user-visible name of this sound complex. - ti,audio-codec : The phandle of the TLV320AIC3x audio codec - ti,mcasp-controller : The phandle of the McASP controller -- ti,codec-clock-rate : The Codec Clock rate (in Hz) applied to the Codec - ti,audio-routing : A list of the connections between audio components. Each entry is a pair of strings, the first being the connection's sink, the second being the connection's source. Valid names for sources and sinks are the codec's pins, and the jacks on the board: +Optional properties: +- ti,codec-clock-rate : The Codec Clock rate (in Hz) applied to the Codec. +- clocks : Reference to the master clock +- clock-names : The clock should be named "mclk" +- Either codec-clock-rate or the codec-clock reference has to be defined. If + the both are defined the driver attempts to set referenced clock to the + defined rate and takes the rate from the clock reference. + Board connectors: * Headphone Jack diff --git a/sound/soc/davinci/davinci-evm.c b/sound/soc/davinci/davinci-evm.c index 5e3bc3c6801a..621e9a997d4c 100644 --- a/sound/soc/davinci/davinci-evm.c +++ b/sound/soc/davinci/davinci-evm.c @@ -17,6 +17,7 @@ #include <linux/platform_data/edma.h> #include <linux/i2c.h> #include <linux/of_platform.h> +#include <linux/clk.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/soc.h> @@ -30,9 +31,34 @@ #include "davinci-i2s.h" struct snd_soc_card_drvdata_davinci { + struct clk *mclk; unsigned sysclk; }; +static int evm_startup(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_card *soc_card = rtd->codec->card; + struct snd_soc_card_drvdata_davinci *drvdata = + snd_soc_card_get_drvdata(soc_card); + + if (drvdata->mclk) + return clk_prepare_enable(drvdata->mclk); + + return 0; +} + +static void evm_shutdown(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_card *soc_card = rtd->codec->card; + struct snd_soc_card_drvdata_davinci *drvdata = + snd_soc_card_get_drvdata(soc_card); + + if (drvdata->mclk) + clk_disable_unprepare(drvdata->mclk); +} + static int evm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { @@ -59,6 +85,8 @@ static int evm_hw_params(struct snd_pcm_substream *substream, } static struct snd_soc_ops evm_ops = { + .startup = evm_startup, + .shutdown = evm_shutdown, .hw_params = evm_hw_params, }; @@ -348,6 +376,7 @@ static int davinci_evm_probe(struct platform_device *pdev) of_match_device(of_match_ptr(davinci_evm_dt_ids), &pdev->dev); struct snd_soc_dai_link *dai = (struct snd_soc_dai_link *) match->data; struct snd_soc_card_drvdata_davinci *drvdata = NULL; + struct clk *mclk; int ret = 0; evm_soc_card.dai_link = dai; @@ -367,13 +396,38 @@ static int davinci_evm_probe(struct platform_device *pdev) if (ret) return ret; + mclk = devm_clk_get(&pdev->dev, "mclk"); + if (PTR_ERR(mclk) == -EPROBE_DEFER) { + return -EPROBE_DEFER; + } else if (IS_ERR(mclk)) { + dev_dbg(&pdev->dev, "mclk not found.\n"); + mclk = NULL; + } + drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); if (!drvdata) return -ENOMEM; + drvdata->mclk = mclk; + ret = of_property_read_u32(np, "ti,codec-clock-rate", &drvdata->sysclk); - if (ret < 0) - return -EINVAL; + + if (ret < 0) { + if (!drvdata->mclk) { + dev_err(&pdev->dev, + "No clock or clock rate defined.\n"); + return -EINVAL; + } + drvdata->sysclk = clk_get_rate(drvdata->mclk); + } else if (drvdata->mclk) { + unsigned int requestd_rate = drvdata->sysclk; + clk_set_rate(drvdata->mclk, drvdata->sysclk); + drvdata->sysclk = clk_get_rate(drvdata->mclk); + if (drvdata->sysclk != requestd_rate) + dev_warn(&pdev->dev, + "Could not get requested rate %u using %u.\n", + requestd_rate, drvdata->sysclk); + } snd_soc_card_set_drvdata(&evm_soc_card, drvdata); ret = devm_snd_soc_register_card(&pdev->dev, &evm_soc_card); diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c index 670afa29e30d..f662ef22b8ae 100644 --- a/sound/soc/davinci/davinci-mcasp.c +++ b/sound/soc/davinci/davinci-mcasp.c @@ -53,6 +53,9 @@ struct davinci_mcasp { u16 bclk_lrclk_ratio; int streams; + int sysclk_freq; + bool bclk_master; + /* McASP FIFO related */ u8 txnumevt; u8 rxnumevt; @@ -294,6 +297,7 @@ static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai, mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, ACLKX | ACLKR); mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AFSX | AFSR); + mcasp->bclk_master = 1; break; case SND_SOC_DAIFMT_CBM_CFS: /* codec is clock master and frame slave */ @@ -305,6 +309,7 @@ static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai, mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, ACLKX | ACLKR); mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AFSX | AFSR); + mcasp->bclk_master = 0; break; case SND_SOC_DAIFMT_CBM_CFM: /* codec is clock and frame master */ @@ -316,6 +321,7 @@ static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai, mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, ACLKX | AHCLKX | AFSX | ACLKR | AHCLKR | AFSR); + mcasp->bclk_master = 0; break; default: @@ -410,6 +416,8 @@ static int davinci_mcasp_set_sysclk(struct snd_soc_dai *dai, int clk_id, mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AHCLKX); } + mcasp->sysclk_freq = freq; + return 0; } @@ -607,6 +615,18 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream, int ret; struct snd_interval *pcm_channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); + + /* If mcasp is BCLK master we need to set BCLK divider */ + if (mcasp->bclk_master) { + unsigned int bclk_freq = snd_soc_params_to_bclk(params); + if (mcasp->sysclk_freq % bclk_freq != 0) { + dev_err(mcasp->dev, "Can't produce requred BCLK\n"); + return -EINVAL; + } + davinci_mcasp_set_clkdiv( + cpu_dai, 1, mcasp->sysclk_freq / bclk_freq); + } + channels = pcm_channels->min; active_serializers = (channels + slots - 1) / slots; |