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ASoC: rockchip: pdm_v2: Fix clk glitch on runtime PM

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For controller which is managed by PD (power-domain),
when PD off, the controller is reset to the default
status, and the FRAC-DIV is a fixed value(1/20).

Once the mclk is enabled, there are some high freq cycle
leak, to fix this issue, we use the pinctrl-idle to
block these cycles until the config has been come back
to the normal state.

Ref: commit 1f8e86a5ea ("ASoC: rockchip: pdm: Fix clk glitch on runtime PM")

Signed-off-by: XiaoTan Luo <lxt@rock-chips.com>
Change-Id: I8b1226896d8ca20293335a879452df732801f712
This commit is contained in:
XiaoTan Luo
2024-07-12 10:57:22 +08:00
committed by Tao Huang
parent 746acc7fa8
commit 48aa220b8b
1 changed files with 44 additions and 0 deletions
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44
sound/soc/rockchip/rockchip_pdm_v2.c
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@@ -10,6 +10,7 @@
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/rational.h>
#include <linux/regmap.h>
@@ -19,6 +20,7 @@
#include <sound/tlv.h>
#include "rockchip_pdm_v2.h"
#include "rockchip_utils.h"
#define PDM_V2_DMA_BURST_SIZE (8) /* size * width: 8*4 = 32 bytes */
#define PDM_V2_PATH_MAX (4)
@@ -65,6 +67,8 @@ struct rk_pdm_v2_dev {
struct regmap *regmap;
struct snd_dmaengine_dai_dma_data capture_dma_data;
struct reset_control *reset;
struct pinctrl *pinctrl;
struct pinctrl_state *clk_state;
unsigned int start_delay_ms;
unsigned int clk_ref_frq;
unsigned int quirks;
@@ -490,6 +494,33 @@ static const struct snd_soc_component_driver rockchip_pdm_v2_component = {
.legacy_dai_naming = 1,
};
static int rockchip_pdm_v2_pinctrl_select_clk_state(struct device *dev)
{
struct rk_pdm_v2_dev *pdm = dev_get_drvdata(dev);
if (IS_ERR_OR_NULL(pdm->pinctrl) || !pdm->clk_state)
return 0;
/*
* A necessary delay to make sure the correct
* frac div has been applied when resume from
* power down.
*/
udelay(10);
/*
* Must disable the clk to avoid clk glitch
* when pinctrl switch from gpio to pdm clk.
*/
rockchip_utils_clk_gate_endisable(pdm->dev, pdm->clk_out, 0);
udelay(10);
pinctrl_select_state(pdm->pinctrl, pdm->clk_state);
udelay(10);
rockchip_utils_clk_gate_endisable(pdm->dev, pdm->clk_out, 1);
return 0;
}
static int rockchip_pdm_v2_runtime_suspend(struct device *dev)
{
struct rk_pdm_v2_dev *pdm = dev_get_drvdata(dev);
@@ -499,6 +530,8 @@ static int rockchip_pdm_v2_runtime_suspend(struct device *dev)
clk_disable_unprepare(pdm->hclk);
clk_disable_unprepare(pdm->clk_out);
pinctrl_pm_select_idle_state(dev);
return 0;
}
@@ -527,6 +560,8 @@ static int rockchip_pdm_v2_runtime_resume(struct device *dev)
rockchip_pdm_v2_rxctrl(pdm, 0);
rockchip_pdm_v2_pinctrl_select_clk_state(dev);
return 0;
err_regmap:
@@ -745,6 +780,15 @@ static int rockchip_pdm_v2_probe(struct platform_device *pdev)
pdm->dev = &pdev->dev;
dev_set_drvdata(&pdev->dev, pdm);
pdm->pinctrl = devm_pinctrl_get(&pdev->dev);
if (!IS_ERR_OR_NULL(pdm->pinctrl)) {
pdm->clk_state = pinctrl_lookup_state(pdm->pinctrl, "clk");
if (IS_ERR(pdm->clk_state)) {
pdm->clk_state = NULL;
dev_warn(pdm->dev, "Have no clk pinctrl state\n");
}
}
pdm->start_delay_ms = PDM_V2_START_DELAY_MS_DEFAULT;
pdm->clk = devm_clk_get(&pdev->dev, "pdm_clk");