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Date: Thu, 16 Apr 2020 08:56:21 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To: Ajit Pandey <ajitp@...eaurora.org>, alsa-devel@...a-project.org,
broonie@...nel.org, devicetree@...r.kernel.org,
plai@...eaurora.org, bgoswami@...eaurora.org
Cc: linux-kernel@...r.kernel.org, tiwai@...e.com
Subject: Re: [PATCH 02/11] ASoC: qcom: lpass: Add struct lpass_dai to store
dai clocks pointer
On 11/04/2020 09:02, Ajit Pandey wrote:
> lpass_dai will store clocks related to respective dai's and it will
> be initialized during probe based on variant clock names.
>
> Signed-off-by: Ajit Pandey <ajitp@...eaurora.org>
I dont understand why do we need this change? What is the advantage of
doing this way vs the existing one?
--srini
> ---
> sound/soc/qcom/lpass-cpu.c | 89 ++++++++++++++++++++++++++--------------------
> sound/soc/qcom/lpass.h | 18 +++++-----
> 2 files changed, 61 insertions(+), 46 deletions(-)
>
> diff --git a/sound/soc/qcom/lpass-cpu.c b/sound/soc/qcom/lpass-cpu.c
> index dbce7e9..492f27b 100644
> --- a/sound/soc/qcom/lpass-cpu.c
> +++ b/sound/soc/qcom/lpass-cpu.c
> @@ -23,13 +23,15 @@ static int lpass_cpu_daiops_set_sysclk(struct snd_soc_dai *dai, int clk_id,
> unsigned int freq, int dir)
> {
> struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
> - int ret;
> -
> - ret = clk_set_rate(drvdata->mi2s_osr_clk[dai->driver->id], freq);
> - if (ret)
> - dev_err(dai->dev, "error setting mi2s osrclk to %u: %d\n",
> - freq, ret);
> + struct lpass_dai *dai_data = drvdata->dai_priv[dai->driver->id];
> + int ret = 0;
>
> + if (dai_data->osr_clk != NULL) {
> + ret = clk_set_rate(dai_data->osr_clk, freq);
> + if (ret)
> + dev_err(dai->dev, "error setting mi2s osrclk to %u:%d\n",
> + freq, ret);
> + }
> return ret;
> }
>
> @@ -37,18 +39,22 @@ static int lpass_cpu_daiops_startup(struct snd_pcm_substream *substream,
> struct snd_soc_dai *dai)
> {
> struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
> + struct lpass_dai *dai_data = drvdata->dai_priv[dai->driver->id];
> int ret;
>
> - ret = clk_prepare_enable(drvdata->mi2s_osr_clk[dai->driver->id]);
> - if (ret) {
> - dev_err(dai->dev, "error in enabling mi2s osr clk: %d\n", ret);
> - return ret;
> + if (dai_data->osr_clk != NULL) {
> + ret = clk_prepare_enable(dai_data->osr_clk);
> + if (ret) {
> + dev_err(dai->dev,
> + "error in enabling mi2s osr clk: %d\n", ret);
> + return ret;
> + }
> }
>
> - ret = clk_prepare_enable(drvdata->mi2s_bit_clk[dai->driver->id]);
> + ret = clk_prepare_enable(dai_data->bit_clk);
> if (ret) {
> dev_err(dai->dev, "error in enabling mi2s bit clk: %d\n", ret);
> - clk_disable_unprepare(drvdata->mi2s_osr_clk[dai->driver->id]);
> + clk_disable_unprepare(dai_data->osr_clk);
> return ret;
> }
>
> @@ -59,16 +65,18 @@ static void lpass_cpu_daiops_shutdown(struct snd_pcm_substream *substream,
> struct snd_soc_dai *dai)
> {
> struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
> + struct lpass_dai *dai_data = drvdata->dai_priv[dai->driver->id];
>
> - clk_disable_unprepare(drvdata->mi2s_bit_clk[dai->driver->id]);
> + clk_disable_unprepare(dai_data->bit_clk);
>
> - clk_disable_unprepare(drvdata->mi2s_osr_clk[dai->driver->id]);
> + clk_disable_unprepare(dai_data->osr_clk);
> }
>
> static int lpass_cpu_daiops_hw_params(struct snd_pcm_substream *substream,
> struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
> {
> struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
> + struct lpass_dai *dai_data = drvdata->dai_priv[dai->driver->id];
> snd_pcm_format_t format = params_format(params);
> unsigned int channels = params_channels(params);
> unsigned int rate = params_rate(params);
> @@ -163,8 +171,7 @@ static int lpass_cpu_daiops_hw_params(struct snd_pcm_substream *substream,
> return ret;
> }
>
> - ret = clk_set_rate(drvdata->mi2s_bit_clk[dai->driver->id],
> - rate * bitwidth * 2);
> + ret = clk_set_rate(dai_data->bit_clk, rate * bitwidth * 2);
> if (ret) {
> dev_err(dai->dev, "error setting mi2s bitclk to %u: %d\n",
> rate * bitwidth * 2, ret);
> @@ -413,6 +420,25 @@ static bool lpass_cpu_regmap_volatile(struct device *dev, unsigned int reg)
> .cache_type = REGCACHE_FLAT,
> };
>
> +static int lpass_init_dai_clocks(struct device *dev,
> + struct lpass_data *drvdata)
> +{
> + struct lpass_dai *dai;
> + struct lpass_variant *v = drvdata->variant;
> + int i;
> +
> + for (i = 0; i < v->num_dai; i++) {
> +
> + dai = drvdata->dai_priv[i];
> +
> + dai->osr_clk = devm_clk_get_optional(dev,
> + v->dai_osr_clk_names[i]);
> + dai->bit_clk = devm_clk_get(dev, v->dai_bit_clk_names[i]);
> + }
> +
> + return 0;
> +}
> +
> int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev)
> {
> struct lpass_data *drvdata;
> @@ -421,7 +447,7 @@ int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev)
> struct lpass_variant *variant;
> struct device *dev = &pdev->dev;
> const struct of_device_id *match;
> - int ret, i, dai_id;
> + int ret, i;
>
> dsp_of_node = of_parse_phandle(pdev->dev.of_node, "qcom,adsp", 0);
> if (dsp_of_node) {
> @@ -467,28 +493,15 @@ int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev)
> variant->init(pdev);
>
> for (i = 0; i < variant->num_dai; i++) {
> - dai_id = variant->dai_driver[i].id;
> - drvdata->mi2s_osr_clk[dai_id] = devm_clk_get(&pdev->dev,
> - variant->dai_osr_clk_names[i]);
> - if (IS_ERR(drvdata->mi2s_osr_clk[dai_id])) {
> - dev_warn(&pdev->dev,
> - "%s() error getting optional %s: %ld\n",
> - __func__,
> - variant->dai_osr_clk_names[i],
> - PTR_ERR(drvdata->mi2s_osr_clk[dai_id]));
> -
> - drvdata->mi2s_osr_clk[dai_id] = NULL;
> - }
> + drvdata->dai_priv[i] = devm_kzalloc(dev,
> + sizeof(struct lpass_dai),
> + GFP_KERNEL);
> + }
>
> - drvdata->mi2s_bit_clk[dai_id] = devm_clk_get(&pdev->dev,
> - variant->dai_bit_clk_names[i]);
> - if (IS_ERR(drvdata->mi2s_bit_clk[dai_id])) {
> - dev_err(&pdev->dev,
> - "error getting %s: %ld\n",
> - variant->dai_bit_clk_names[i],
> - PTR_ERR(drvdata->mi2s_bit_clk[dai_id]));
> - return PTR_ERR(drvdata->mi2s_bit_clk[dai_id]);
> - }
> + ret = lpass_init_dai_clocks(dev, drvdata);
> + if (ret) {
> + dev_err(&pdev->dev, "error intializing dai clock: %d\n", ret);
> + return ret;
> }
>
> drvdata->ahbix_clk = devm_clk_get(&pdev->dev, "ahbix-clk");
> diff --git a/sound/soc/qcom/lpass.h b/sound/soc/qcom/lpass.h
> index 17113d3..b729686 100644
> --- a/sound/soc/qcom/lpass.h
> +++ b/sound/soc/qcom/lpass.h
> @@ -13,9 +13,14 @@
> #include <linux/platform_device.h>
> #include <linux/regmap.h>
>
> -#define LPASS_AHBIX_CLOCK_FREQUENCY 131072000
> -#define LPASS_MAX_MI2S_PORTS (8)
> -#define LPASS_MAX_DMA_CHANNELS (8)
> +#define LPASS_AHBIX_CLOCK_FREQUENCY 131072000
> +#define LPASS_MAX_MI2S_PORTS (8)
> +#define LPASS_MAX_DMA_CHANNELS (8)
> +
> +struct lpass_dai {
> + struct clk *osr_clk;
> + struct clk *bit_clk;
> +};
>
> /* Both the CPU DAI and platform drivers will access this data */
> struct lpass_data {
> @@ -23,11 +28,8 @@ struct lpass_data {
> /* AHB-I/X bus clocks inside the low-power audio subsystem (LPASS) */
> struct clk *ahbix_clk;
>
> - /* MI2S system clock */
> - struct clk *mi2s_osr_clk[LPASS_MAX_MI2S_PORTS];
> -
> - /* MI2S bit clock (derived from system clock by a divider */
> - struct clk *mi2s_bit_clk[LPASS_MAX_MI2S_PORTS];
> + /* MI2S dai specific configuration */
> + struct lpass_dai *dai_priv[LPASS_MAX_MI2S_PORTS];
>
> /* low-power audio interface (LPAIF) registers */
> void __iomem *lpaif;
>
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