Distributions such as Fedora, Ubuntu and Gallium don't currently have a means to support Baytrail Chromebooks and other platforms with the same build [1][2] due to incompatible platform drivers. Add MCLK management to reuse this machine driver for Baytrail platforms and solve this coexistence problem at last. UCM files are provided at [3] and will eventually be submitted to the new repo. The legacy byt-max98090 machine driver is still maintained but can only be used when the other Atom/DPCM driver is not compiled in, or when users don't want to configure extra mixers required by the Atom/sst driver. Tested on Lenovo 100s Baytrail Chromebook w/ Mr. Chromebox BOOT_STUB firmware and Acer R11 Cherrytrail Chromebook [1] https://bugzilla.redhat.com/show_bug.cgi?id=1335196 [2] http://mailman.alsa-project.org/pipermail/alsa-devel/2016-August/ 111641.html [3] https://github.com/plbossart/UCM/tree/master/byt-max98090 Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx> --- sound/soc/intel/boards/cht_bsw_max98090_ti.c | 78 ++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) diff --git a/sound/soc/intel/boards/cht_bsw_max98090_ti.c b/sound/soc/intel/boards/cht_bsw_max98090_ti.c index 455a55a..01bacca 100644 --- a/sound/soc/intel/boards/cht_bsw_max98090_ti.c +++ b/sound/soc/intel/boards/cht_bsw_max98090_ti.c @@ -23,6 +23,7 @@ #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/acpi.h> +#include <linux/clk.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> @@ -35,15 +36,60 @@ #define CHT_CODEC_DAI "HiFi" struct cht_mc_private { + struct clk *mclk; struct snd_soc_jack jack; bool ts3a227e_present; }; +static inline struct snd_soc_dai *cht_get_codec_dai(struct snd_soc_card *card) +{ + struct snd_soc_pcm_runtime *rtd; + + list_for_each_entry(rtd, &card->rtd_list, list) { + if (!strncmp(rtd->codec_dai->name, CHT_CODEC_DAI, + strlen(CHT_CODEC_DAI))) + return rtd->codec_dai; + } + return NULL; +} + +static int platform_clock_control(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *k, int event) +{ + struct snd_soc_dapm_context *dapm = w->dapm; + struct snd_soc_card *card = dapm->card; + struct snd_soc_dai *codec_dai; + struct cht_mc_private *ctx = snd_soc_card_get_drvdata(card); + int ret; + + codec_dai = cht_get_codec_dai(card); + if (!codec_dai) { + dev_err(card->dev, "Codec dai not found; Unable to set platform clock\n"); + return -EIO; + } + + if (SND_SOC_DAPM_EVENT_ON(event)) { + ret = clk_prepare_enable(ctx->mclk); + if (ret < 0) { + dev_err(card->dev, + "could not configure MCLK state"); + return ret; + } + } else { + clk_disable_unprepare(ctx->mclk); + } + + return 0; +} + static const struct snd_soc_dapm_widget cht_dapm_widgets[] = { SND_SOC_DAPM_HP("Headphone", NULL), SND_SOC_DAPM_MIC("Headset Mic", NULL), SND_SOC_DAPM_MIC("Int Mic", NULL), SND_SOC_DAPM_SPK("Ext Spk", NULL), + SND_SOC_DAPM_SUPPLY("Platform Clock", SND_SOC_NOPM, 0, 0, + platform_clock_control, SND_SOC_DAPM_PRE_PMU | + SND_SOC_DAPM_POST_PMD), }; static const struct snd_soc_dapm_route cht_audio_map[] = { @@ -60,6 +106,10 @@ static const struct snd_soc_dapm_route cht_audio_map[] = { {"codec_in0", NULL, "ssp2 Rx" }, {"codec_in1", NULL, "ssp2 Rx" }, {"ssp2 Rx", NULL, "HiFi Capture"}, + {"Headphone", NULL, "Platform Clock"}, + {"Headset Mic", NULL, "Platform Clock"}, + {"Int Mic", NULL, "Platform Clock"}, + {"Ext Spk", NULL, "Platform Clock"}, }; static const struct snd_kcontrol_new cht_mc_controls[] = { @@ -141,6 +191,25 @@ static int cht_codec_init(struct snd_soc_pcm_runtime *runtime) if (ctx->ts3a227e_present) snd_soc_jack_notifier_register(jack, &cht_jack_nb); + /* + * The firmware might enable the clock at + * boot (this information may or may not + * be reflected in the enable clock register). + * To change the rate we must disable the clock + * first to cover these cases. Due to common + * clock framework restrictions that do not allow + * to disable a clock that has not been enabled, + * we need to enable the clock first. + */ + ret = clk_prepare_enable(ctx->mclk); + if (!ret) + clk_disable_unprepare(ctx->mclk); + + ret = clk_set_rate(ctx->mclk, CHT_PLAT_CLK_3_HZ); + + if (ret) + dev_err(runtime->dev, "unable to set MCLK rate\n"); + return ret; } @@ -294,6 +363,15 @@ static int snd_cht_mc_probe(struct platform_device *pdev) /* register the soc card */ snd_soc_card_cht.dev = &pdev->dev; snd_soc_card_set_drvdata(&snd_soc_card_cht, drv); + + drv->mclk = devm_clk_get(&pdev->dev, "pmc_plt_clk_3"); + if (IS_ERR(drv->mclk)) { + dev_err(&pdev->dev, + "Failed to get MCLK from pmc_plt_clk_3: %ld\n", + PTR_ERR(drv->mclk)); + return PTR_ERR(drv->mclk); + } + ret_val = devm_snd_soc_register_card(&pdev->dev, &snd_soc_card_cht); if (ret_val) { dev_err(&pdev->dev, -- 2.9.3 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
