> Subject: [PATCH] ASoC: Intel: eve: Enable mclk and ssp sclk early
>
> From: Naveen M <naveen.m@xxxxxxxxx>
>
> rt5663 and rt5514 needs mclk/sclk early to synchronize its internal clocks.
>
> Signed-off-by: Naveen M <naveen.m@xxxxxxxxx>
> Signed-off-by: Harsha Priya <harshapriya.n@xxxxxxxxx>
> Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@xxxxxxxxx>
> Signed-off-by: Brent Lu <brent.lu@xxxxxxxxx>
> ---
> sound/soc/intel/boards/Kconfig | 1 +
> .../soc/intel/boards/kbl_rt5663_rt5514_max98927.c | 94
> ++++++++++++++++++++++
> 2 files changed, 95 insertions(+)
>
Hi Pierre-Louis
This is the v2 patch based on your previous comment to remove unnecessary
function calls. The order in Kconfig is also rearranged. Please let me know if
this patch is ok. Thanks.
> diff --git a/sound/soc/intel/boards/Kconfig
> b/sound/soc/intel/boards/Kconfig index 5c27f7a..5e0e7db 100644
> --- a/sound/soc/intel/boards/Kconfig
> +++ b/sound/soc/intel/boards/Kconfig
> @@ -320,6 +320,7 @@ config
> SND_SOC_INTEL_KBL_RT5663_RT5514_MAX98927_MACH
> select SND_SOC_RT5514_SPI
> select SND_SOC_MAX98927
> select SND_SOC_HDAC_HDMI
> + select SND_SOC_INTEL_SKYLAKE_SSP_CLK
> help
> This adds support for ASoC Onboard Codec I2S machine driver. This will
> create an alsa sound card for RT5663 + RT5514 + MAX98927.
> diff --git a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> index 74dda87..dc09a85 100644
> --- a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> +++ b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
> @@ -22,6 +22,9 @@
> #include "../../codecs/rt5514.h"
> #include "../../codecs/rt5663.h"
> #include "../../codecs/hdac_hdmi.h"
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/clkdev.h>
>
> #define KBL_REALTEK_CODEC_DAI "rt5663-aif"
> #define KBL_REALTEK_DMIC_CODEC_DAI "rt5514-aif1"
> @@ -50,6 +53,8 @@ struct kbl_codec_private {
> struct snd_soc_jack kabylake_headset;
> struct list_head hdmi_pcm_list;
> struct snd_soc_jack kabylake_hdmi[2];
> + struct clk *mclk;
> + struct clk *sclk;
> };
>
> enum {
> @@ -71,6 +76,61 @@ static const struct snd_kcontrol_new
> kabylake_controls[] = {
> SOC_DAPM_PIN_SWITCH("DMIC"),
> };
>
> +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 kbl_codec_private *priv = snd_soc_card_get_drvdata(card);
> + int ret = 0;
> +
> + /*
> + * MCLK/SCLK need to be ON early for a successful synchronization of
> + * codec internal clock. And the clocks are turned off during
> + * POST_PMD after the stream is stopped.
> + */
> + switch (event) {
> + case SND_SOC_DAPM_PRE_PMU:
> + /* Enable MCLK */
> + ret = clk_set_rate(priv->mclk, 24000000);
> + if (ret < 0) {
> + dev_err(card->dev, "Can't set rate for mclk, err:
> %d\n",
> + ret);
> + return ret;
> + }
> +
> + ret = clk_prepare_enable(priv->mclk);
> + if (ret < 0) {
> + dev_err(card->dev, "Can't enable mclk, err: %d\n",
> ret);
> + return ret;
> + }
> +
> + /* Enable SCLK */
> + ret = clk_set_rate(priv->sclk, 3072000);
> + if (ret < 0) {
> + dev_err(card->dev, "Can't set rate for sclk, err:
> %d\n",
> + ret);
> + clk_disable_unprepare(priv->mclk);
> + return ret;
> + }
> +
> + ret = clk_prepare_enable(priv->sclk);
> + if (ret < 0) {
> + dev_err(card->dev, "Can't enable sclk, err: %d\n",
> ret);
> + clk_disable_unprepare(priv->mclk);
> + }
> + break;
> + case SND_SOC_DAPM_POST_PMD:
> + clk_disable_unprepare(priv->mclk);
> + clk_disable_unprepare(priv->sclk);
> + break;
> + default:
> + return 0;
> + }
> +
> + return 0;
> +}
> +
> static const struct snd_soc_dapm_widget kabylake_widgets[] = {
> SND_SOC_DAPM_HP("Headphone Jack", NULL),
> SND_SOC_DAPM_MIC("Headset Mic", NULL), @@ -79,11 +139,15
> @@ static const struct snd_soc_dapm_widget kabylake_widgets[] = {
> SND_SOC_DAPM_MIC("DMIC", NULL),
> SND_SOC_DAPM_SPK("HDMI1", NULL),
> SND_SOC_DAPM_SPK("HDMI2", 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 kabylake_map[] = {
> /* Headphones */
> + { "Headphone Jack", NULL, "Platform Clock" },
> { "Headphone Jack", NULL, "HPOL" },
> { "Headphone Jack", NULL, "HPOR" },
>
> @@ -92,6 +156,7 @@ static const struct snd_soc_dapm_route
> kabylake_map[] = {
> { "Right Spk", NULL, "Right BE_OUT" },
>
> /* other jacks */
> + { "Headset Mic", NULL, "Platform Clock" },
> { "IN1P", NULL, "Headset Mic" },
> { "IN1N", NULL, "Headset Mic" },
>
> @@ -643,6 +708,7 @@ static int kabylake_audio_probe(struct
> platform_device *pdev) {
> struct kbl_codec_private *ctx;
> struct snd_soc_acpi_mach *mach;
> + int ret = 0;
>
> ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
> if (!ctx)
> @@ -658,6 +724,34 @@ static int kabylake_audio_probe(struct
> platform_device *pdev)
> dmic_constraints = mach->mach_params.dmic_num == 2 ?
> &constraints_dmic_2ch :
> &constraints_dmic_channels;
>
> + ctx->mclk = devm_clk_get(&pdev->dev, "ssp1_mclk");
> + if (IS_ERR(ctx->mclk)) {
> + ret = PTR_ERR(ctx->mclk);
> + if (ret == -ENOENT) {
> + dev_info(&pdev->dev,
> + "Failed to get ssp1_mclk, defer probe\n");
> + return -EPROBE_DEFER;
> + }
> +
> + dev_err(&pdev->dev, "Failed to get ssp1_mclk with
> err:%d\n",
> + ret);
> + return ret;
> + }
> +
> + ctx->sclk = devm_clk_get(&pdev->dev, "ssp1_sclk");
> + if (IS_ERR(ctx->sclk)) {
> + ret = PTR_ERR(ctx->sclk);
> + if (ret == -ENOENT) {
> + dev_info(&pdev->dev,
> + "Failed to get ssp1_sclk, defer probe\n");
> + return -EPROBE_DEFER;
> + }
> +
> + dev_err(&pdev->dev, "Failed to get ssp1_sclk with err:%d\n",
> + ret);
> + return ret;
> + }
> +
> return devm_snd_soc_register_card(&pdev->dev,
> &kabylake_audio_card); }
>
> --
> 2.7.4
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