linux/sound/soc/fsl/fsl_mqs.c
Shengjiu Wang 15217d170a
ASoC: fsl_mqs: Fix unchecked return value for clk_prepare_enable
Fix unchecked return value for clk_prepare_enable, add error
handler in fsl_mqs_runtime_resume.

Fixes: 9e28f6532c ("ASoC: fsl_mqs: Add MQS component driver")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Link: https://lore.kernel.org/r/5edd68d03def367d96268f1a9a00bd528ea5aaf2.1592888591.git.shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2020-06-23 11:14:22 +01:00

341 lines
8.3 KiB
C

// SPDX-License-Identifier: GPL-2.0
//
// ALSA SoC IMX MQS driver
//
// Copyright (C) 2014-2015 Freescale Semiconductor, Inc.
// Copyright 2019 NXP
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <sound/soc.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#define REG_MQS_CTRL 0x00
#define MQS_EN_MASK (0x1 << 28)
#define MQS_EN_SHIFT (28)
#define MQS_SW_RST_MASK (0x1 << 24)
#define MQS_SW_RST_SHIFT (24)
#define MQS_OVERSAMPLE_MASK (0x1 << 20)
#define MQS_OVERSAMPLE_SHIFT (20)
#define MQS_CLK_DIV_MASK (0xFF << 0)
#define MQS_CLK_DIV_SHIFT (0)
/* codec private data */
struct fsl_mqs {
struct regmap *regmap;
struct clk *mclk;
struct clk *ipg;
unsigned int reg_iomuxc_gpr2;
unsigned int reg_mqs_ctrl;
bool use_gpr;
};
#define FSL_MQS_RATES (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
#define FSL_MQS_FORMATS SNDRV_PCM_FMTBIT_S16_LE
static int fsl_mqs_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct fsl_mqs *mqs_priv = snd_soc_component_get_drvdata(component);
unsigned long mclk_rate;
int div, res;
int lrclk;
mclk_rate = clk_get_rate(mqs_priv->mclk);
lrclk = params_rate(params);
/*
* mclk_rate / (oversample(32,64) * FS * 2 * divider ) = repeat_rate;
* if repeat_rate is 8, mqs can achieve better quality.
* oversample rate is fix to 32 currently.
*/
div = mclk_rate / (32 * lrclk * 2 * 8);
res = mclk_rate % (32 * lrclk * 2 * 8);
if (res == 0 && div > 0 && div <= 256) {
if (mqs_priv->use_gpr) {
regmap_update_bits(mqs_priv->regmap, IOMUXC_GPR2,
IMX6SX_GPR2_MQS_CLK_DIV_MASK,
(div - 1) << IMX6SX_GPR2_MQS_CLK_DIV_SHIFT);
regmap_update_bits(mqs_priv->regmap, IOMUXC_GPR2,
IMX6SX_GPR2_MQS_OVERSAMPLE_MASK, 0);
} else {
regmap_update_bits(mqs_priv->regmap, REG_MQS_CTRL,
MQS_CLK_DIV_MASK,
(div - 1) << MQS_CLK_DIV_SHIFT);
regmap_update_bits(mqs_priv->regmap, REG_MQS_CTRL,
MQS_OVERSAMPLE_MASK, 0);
}
} else {
dev_err(component->dev, "can't get proper divider\n");
}
return 0;
}
static int fsl_mqs_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
/* Only LEFT_J & SLAVE mode is supported. */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_LEFT_J:
break;
default:
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
break;
default:
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
break;
default:
return -EINVAL;
}
return 0;
}
static int fsl_mqs_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct fsl_mqs *mqs_priv = snd_soc_component_get_drvdata(component);
if (mqs_priv->use_gpr)
regmap_update_bits(mqs_priv->regmap, IOMUXC_GPR2,
IMX6SX_GPR2_MQS_EN_MASK,
1 << IMX6SX_GPR2_MQS_EN_SHIFT);
else
regmap_update_bits(mqs_priv->regmap, REG_MQS_CTRL,
MQS_EN_MASK,
1 << MQS_EN_SHIFT);
return 0;
}
static void fsl_mqs_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct fsl_mqs *mqs_priv = snd_soc_component_get_drvdata(component);
if (mqs_priv->use_gpr)
regmap_update_bits(mqs_priv->regmap, IOMUXC_GPR2,
IMX6SX_GPR2_MQS_EN_MASK, 0);
else
regmap_update_bits(mqs_priv->regmap, REG_MQS_CTRL,
MQS_EN_MASK, 0);
}
static const struct snd_soc_component_driver soc_codec_fsl_mqs = {
.idle_bias_on = 1,
.non_legacy_dai_naming = 1,
};
static const struct snd_soc_dai_ops fsl_mqs_dai_ops = {
.startup = fsl_mqs_startup,
.shutdown = fsl_mqs_shutdown,
.hw_params = fsl_mqs_hw_params,
.set_fmt = fsl_mqs_set_dai_fmt,
};
static struct snd_soc_dai_driver fsl_mqs_dai = {
.name = "fsl-mqs-dai",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = FSL_MQS_RATES,
.formats = FSL_MQS_FORMATS,
},
.ops = &fsl_mqs_dai_ops,
};
static const struct regmap_config fsl_mqs_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = REG_MQS_CTRL,
.cache_type = REGCACHE_NONE,
};
static int fsl_mqs_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device_node *gpr_np = NULL;
struct fsl_mqs *mqs_priv;
void __iomem *regs;
int ret;
mqs_priv = devm_kzalloc(&pdev->dev, sizeof(*mqs_priv), GFP_KERNEL);
if (!mqs_priv)
return -ENOMEM;
/* On i.MX6sx the MQS control register is in GPR domain
* But in i.MX8QM/i.MX8QXP the control register is moved
* to its own domain.
*/
if (of_device_is_compatible(np, "fsl,imx8qm-mqs"))
mqs_priv->use_gpr = false;
else
mqs_priv->use_gpr = true;
if (mqs_priv->use_gpr) {
gpr_np = of_parse_phandle(np, "gpr", 0);
if (!gpr_np) {
dev_err(&pdev->dev, "failed to get gpr node by phandle\n");
return -EINVAL;
}
mqs_priv->regmap = syscon_node_to_regmap(gpr_np);
if (IS_ERR(mqs_priv->regmap)) {
dev_err(&pdev->dev, "failed to get gpr regmap\n");
ret = PTR_ERR(mqs_priv->regmap);
goto err_free_gpr_np;
}
} else {
regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(regs))
return PTR_ERR(regs);
mqs_priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
"core",
regs,
&fsl_mqs_regmap_config);
if (IS_ERR(mqs_priv->regmap)) {
dev_err(&pdev->dev, "failed to init regmap: %ld\n",
PTR_ERR(mqs_priv->regmap));
return PTR_ERR(mqs_priv->regmap);
}
mqs_priv->ipg = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(mqs_priv->ipg)) {
dev_err(&pdev->dev, "failed to get the clock: %ld\n",
PTR_ERR(mqs_priv->ipg));
return PTR_ERR(mqs_priv->ipg);
}
}
mqs_priv->mclk = devm_clk_get(&pdev->dev, "mclk");
if (IS_ERR(mqs_priv->mclk)) {
dev_err(&pdev->dev, "failed to get the clock: %ld\n",
PTR_ERR(mqs_priv->mclk));
ret = PTR_ERR(mqs_priv->mclk);
goto err_free_gpr_np;
}
dev_set_drvdata(&pdev->dev, mqs_priv);
pm_runtime_enable(&pdev->dev);
ret = devm_snd_soc_register_component(&pdev->dev, &soc_codec_fsl_mqs,
&fsl_mqs_dai, 1);
if (ret)
goto err_free_gpr_np;
return 0;
err_free_gpr_np:
of_node_put(gpr_np);
return ret;
}
static int fsl_mqs_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
return 0;
}
#ifdef CONFIG_PM
static int fsl_mqs_runtime_resume(struct device *dev)
{
struct fsl_mqs *mqs_priv = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(mqs_priv->ipg);
if (ret) {
dev_err(dev, "failed to enable ipg clock\n");
return ret;
}
ret = clk_prepare_enable(mqs_priv->mclk);
if (ret) {
dev_err(dev, "failed to enable mclk clock\n");
clk_disable_unprepare(mqs_priv->ipg);
return ret;
}
if (mqs_priv->use_gpr)
regmap_write(mqs_priv->regmap, IOMUXC_GPR2,
mqs_priv->reg_iomuxc_gpr2);
else
regmap_write(mqs_priv->regmap, REG_MQS_CTRL,
mqs_priv->reg_mqs_ctrl);
return 0;
}
static int fsl_mqs_runtime_suspend(struct device *dev)
{
struct fsl_mqs *mqs_priv = dev_get_drvdata(dev);
if (mqs_priv->use_gpr)
regmap_read(mqs_priv->regmap, IOMUXC_GPR2,
&mqs_priv->reg_iomuxc_gpr2);
else
regmap_read(mqs_priv->regmap, REG_MQS_CTRL,
&mqs_priv->reg_mqs_ctrl);
clk_disable_unprepare(mqs_priv->mclk);
clk_disable_unprepare(mqs_priv->ipg);
return 0;
}
#endif
static const struct dev_pm_ops fsl_mqs_pm_ops = {
SET_RUNTIME_PM_OPS(fsl_mqs_runtime_suspend,
fsl_mqs_runtime_resume,
NULL)
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
};
static const struct of_device_id fsl_mqs_dt_ids[] = {
{ .compatible = "fsl,imx8qm-mqs", },
{ .compatible = "fsl,imx6sx-mqs", },
{}
};
MODULE_DEVICE_TABLE(of, fsl_mqs_dt_ids);
static struct platform_driver fsl_mqs_driver = {
.probe = fsl_mqs_probe,
.remove = fsl_mqs_remove,
.driver = {
.name = "fsl-mqs",
.of_match_table = fsl_mqs_dt_ids,
.pm = &fsl_mqs_pm_ops,
},
};
module_platform_driver(fsl_mqs_driver);
MODULE_AUTHOR("Shengjiu Wang <Shengjiu.Wang@nxp.com>");
MODULE_DESCRIPTION("MQS codec driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform: fsl-mqs");