[PATCH v2 02/11] ALSA: cs35l41: Poll for Power Up/Down rather than waiting a fixed delay

Stefan Binding
2023-07-21T15:20:03Z

To ensure the chip has correctly powered up or down before continuing,
the driver will now poll a register, rather than wait a fixed delay.

Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
---
sound/soc/codecs/cs35l41-lib.c | 48 +++++++++++++++++++++++++++++++---
sound/soc/codecs/cs35l41.c | 10 -------
2 files changed, 44 insertions(+), 14 deletions(-)

diff --git a/sound/soc/codecs/cs35l41-lib.c b/sound/soc/codecs/cs35l41-lib.c
index ce3f475023756..4ec306cd2f476 100644
--- a/sound/soc/codecs/cs35l41-lib.c
+++ b/sound/soc/codecs/cs35l41-lib.c
@@ -1196,7 +1196,8 @@ int cs35l41_global_enable(struct device *dev, struct regmap *regmap, enum cs35l4
int enable, struct completion *pll_lock, bool firmware_running)
{
int ret;
- unsigned int gpio1_func, pad_control, pwr_ctrl1, pwr_ctrl3, int_status;
+ unsigned int gpio1_func, pad_control, pwr_ctrl1, pwr_ctrl3, int_status, pup_pdn_mask;
+ unsigned int pwr_ctl1_val;
struct reg_sequence cs35l41_mdsync_down_seq[] = {
{CS35L41_PWR_CTRL3, 0},
{CS35L41_GPIO_PAD_CONTROL, 0},
@@ -1208,6 +1209,12 @@ int cs35l41_global_enable(struct device *dev, struct regmap *regmap, enum cs35l4
{CS35L41_PWR_CTRL1, 0x00000001, 3000},
};

+ pup_pdn_mask = enable ? CS35L41_PUP_DONE_MASK : CS35L41_PDN_DONE_MASK;
+
+ ret = regmap_read(regmap, CS35L41_PWR_CTRL1, &pwr_ctl1_val);
+ if (ret)
+ return ret;
+
if ((pwr_ctl1_val & CS35L41_GLOBAL_EN_MASK) && enable) {
dev_dbg(dev, "Cannot set Global Enable - already set.\n");
return 0;
@@ -1252,6 +1259,15 @@ int cs35l41_global_enable(struct device *dev, struct regmap *regmap, enum cs35l4
ret = regmap_multi_reg_write(regmap, cs35l41_mdsync_up_seq,
ARRAY_SIZE(cs35l41_mdsync_up_seq));
}
+
+ ret = regmap_read_poll_timeout(regmap, CS35L41_IRQ1_STATUS1,
+ int_status, int_status & pup_pdn_mask,
+ 1000, 100000);
+ if (ret)
+ dev_err(dev, "Enable(%d) failed: %d\n", enable, ret);
+
+ // Clear PUP/PDN status
+ regmap_write(regmap, CS35L41_IRQ1_STATUS1, pup_pdn_mask);
break;
case CS35L41_INT_BOOST:
ret = regmap_update_bits(regmap, CS35L41_PWR_CTRL1, CS35L41_GLOBAL_EN_MASK,
@@ -1260,7 +1276,15 @@ int cs35l41_global_enable(struct device *dev, struct regmap *regmap, enum cs35l4
dev_err(dev, "CS35L41_PWR_CTRL1 set failed: %d\n", ret);
return ret;
}
- usleep_range(3000, 3100);
+
+ ret = regmap_read_poll_timeout(regmap, CS35L41_IRQ1_STATUS1,
+ int_status, int_status & pup_pdn_mask,
+ 1000, 100000);
+ if (ret)
+ dev_err(dev, "Enable(%d) failed: %d\n", enable, ret);
+
+ /* Clear PUP/PDN status */
+ regmap_write(regmap, CS35L41_IRQ1_STATUS1, pup_pdn_mask);
break;
case CS35L41_EXT_BOOST:
case CS35L41_EXT_BOOST_NO_VSPK_SWITCH:
@@ -1271,7 +1295,15 @@ int cs35l41_global_enable(struct device *dev, struct regmap *regmap, enum cs35l4
if (ret)
return ret;

- usleep_range(3000, 3100);
+ ret = regmap_read_poll_timeout(regmap, CS35L41_IRQ1_STATUS1, int_status,
+ int_status & CS35L41_PUP_DONE_MASK, 1000, 100000);
+ if (ret) {
+ dev_err(dev, "Failed waiting for CS35L41_PUP_DONE_MASK: %d\n", ret);
+ /* Lock the test key, it was unlocked during the multi_reg_write */
+ cs35l41_test_key_lock(dev, regmap);
+ return ret;
+ }
+ regmap_write(regmap, CS35L41_IRQ1_STATUS1, CS35L41_PUP_DONE_MASK);

if (firmware_running)
ret = cs35l41_set_cspl_mbox_cmd(dev, regmap,
@@ -1292,7 +1324,15 @@ int cs35l41_global_enable(struct device *dev, struct regmap *regmap, enum cs35l4
return ret;
}

- usleep_range(3000, 3100);
+ ret = regmap_read_poll_timeout(regmap, CS35L41_IRQ1_STATUS1, int_status,
+ int_status & CS35L41_PDN_DONE_MASK, 1000, 100000);
+ if (ret) {
+ dev_err(dev, "Failed waiting for CS35L41_PDN_DONE_MASK: %d\n", ret);
+ /* Lock the test key, it was unlocked during the multi_reg_write */
+ cs35l41_test_key_lock(dev, regmap);
+ return ret;
+ }
+ regmap_write(regmap, CS35L41_IRQ1_STATUS1, CS35L41_PDN_DONE_MASK);

/* Test Key is locked here */
ret = regmap_multi_reg_write(regmap, cs35l41_active_to_safe_end,
diff --git a/sound/soc/codecs/cs35l41.c b/sound/soc/codecs/cs35l41.c
index d4e9c9d9b50a6..2b3c36f02edb0 100644
--- a/sound/soc/codecs/cs35l41.c
+++ b/sound/soc/codecs/cs35l41.c
@@ -491,7 +491,6 @@ static int cs35l41_main_amp_event(struct snd_soc_dapm_widget *w,
{
struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
struct cs35l41_private *cs35l41 = snd_soc_component_get_drvdata(component);
- unsigned int val;
int ret = 0;

switch (event) {
@@ -507,15 +506,6 @@ static int cs35l41_main_amp_event(struct snd_soc_dapm_widget *w,
ret = cs35l41_global_enable(cs35l41->dev, cs35l41->regmap, cs35l41->hw_cfg.bst_type,
0, &cs35l41->pll_lock, cs35l41->dsp.cs_dsp.running);

- ret = regmap_read_poll_timeout(cs35l41->regmap, CS35L41_IRQ1_STATUS1,
- val, val & CS35L41_PDN_DONE_MASK,
- 1000, 100000);
- if (ret)
- dev_warn(cs35l41->dev, "PDN failed: %d\n", ret);
-
- regmap_write(cs35l41->regmap, CS35L41_IRQ1_STATUS1,
- CS35L41_PDN_DONE_MASK);
-
regmap_multi_reg_write_bypassed(cs35l41->regmap,
cs35l41_pdn_patch,
ARRAY_SIZE(cs35l41_pdn_patch));
--
2.34.1