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ASoC: rockchip: pdm: Add support for CLK-ALWAYS-ON quirks

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This patch add support for keeping PDM-CLK always on.

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Change-Id: Ibe5f660b52de6dba493a0046f89e4b2af1b379bb
This commit is contained in:
Sugar Zhang
2023-10-15 11:26:32 +08:00
committed by Tao Huang
parent 04219ca7f0
commit 873b86c8a4
1 changed files with 42 additions and 2 deletions
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44
sound/soc/rockchip/rockchip_pdm.c
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@@ -31,8 +31,10 @@
#define PDM_FILTER_DELAY_MS_MIN (20)
#define PDM_FILTER_DELAY_MS_MAX (1000)
#define PDM_CLK_SHIFT_PPM_MAX (1000000) /* 1 ppm */
#define CLK_PPM_MIN (-1000)
#define CLK_PPM_MAX (1000)
#define CLK_PPM_MIN (-1000)
#define CLK_PPM_MAX (1000)
#define QUIRK_ALWAYS_ON BIT(0)
enum rk_pdm_version {
RK_PDM_RK3229,
@@ -56,6 +58,7 @@ struct rk_pdm_dev {
enum rk_pdm_version version;
unsigned int clk_root_rate;
unsigned int clk_root_initial_rate;
unsigned int quirks;
int clk_ppm;
bool clk_calibrate;
};
@@ -97,6 +100,16 @@ static struct rk_pdm_ds_ratio ds_ratio[] = {
{ 4, 8000 },
};
static const struct pdm_of_quirks {
char *quirk;
int id;
} of_quirks[] = {
{
.quirk = "rockchip,always-on",
.id = QUIRK_ALWAYS_ON,
},
};
static unsigned int get_pdm_clk(struct rk_pdm_dev *pdm, unsigned int sr,
unsigned int *clk_src, unsigned int *clk_out,
unsigned int signoff)
@@ -957,6 +970,29 @@ static int rockchip_pdm_path_parse(struct rk_pdm_dev *pdm, struct device_node *n
return 0;
}
static int rockchip_pdm_keep_clk_always_on(struct rk_pdm_dev *pdm)
{
pm_runtime_forbid(pdm->dev);
dev_info(pdm->dev, "CLK-ALWAYS-ON: samplerate: %d\n", PDM_DEFAULT_RATE);
return 0;
}
static int rockchip_pdm_parse_quirks(struct rk_pdm_dev *pdm)
{
int ret = 0, i = 0;
for (i = 0; i < ARRAY_SIZE(of_quirks); i++)
if (device_property_read_bool(pdm->dev, of_quirks[i].quirk))
pdm->quirks |= of_quirks[i].id;
if (pdm->quirks & QUIRK_ALWAYS_ON)
ret = rockchip_pdm_keep_clk_always_on(pdm);
return ret;
}
static int rockchip_pdm_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
@@ -1038,6 +1074,10 @@ static int rockchip_pdm_probe(struct platform_device *pdev)
if (ret != 0 && ret != -ENOENT)
goto err_clk;
ret = rockchip_pdm_parse_quirks(pdm);
if (ret)
goto err_clk;
/*
* MUST: after pm_runtime_enable step, any register R/W
* should be wrapped with pm_runtime_get_sync/put.