[PATCH 0/2] ASoC: cs42l42: Fixes to power-down
Driver probe and remove were inconsistent in what they did to power-down and neither did all steps. In addition to that, neither function prevented the interrupt handler from running during and after power-down.
Richard Fitzgerald (2): ASoC: cs42l42: Reset and power-down on remove() and failed probe() ASoC: cs42l42: free_irq() before powering-down on probe() fail
sound/soc/codecs/cs42l42.c | 43 +++++++++++++++++++++++++++++++------------ 1 file changed, 31 insertions(+), 12 deletions(-)
Driver remove() should assert RESET and disable the supplies.
probe() fail was disabling supplies but it didn't assert reset or put the codec into a power-down state.
Signed-off-by: Richard Fitzgerald rf@opensource.cirrus.com --- sound/soc/codecs/cs42l42.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-)
diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c index a8fff274ec63..dc12842ee6e1 100644 --- a/sound/soc/codecs/cs42l42.c +++ b/sound/soc/codecs/cs42l42.c @@ -2067,7 +2067,7 @@ static int cs42l42_i2c_probe(struct i2c_client *i2c_client, "reset", GPIOD_OUT_LOW); if (IS_ERR(cs42l42->reset_gpio)) { ret = PTR_ERR(cs42l42->reset_gpio); - goto err_disable; + goto err_disable_noreset; }
if (cs42l42->reset_gpio) { @@ -2111,7 +2111,7 @@ static int cs42l42_i2c_probe(struct i2c_client *i2c_client, ret = regmap_read(cs42l42->regmap, CS42L42_REVID, ®); if (ret < 0) { dev_err(&i2c_client->dev, "Get Revision ID failed\n"); - goto err_disable; + goto err_shutdown; }
dev_info(&i2c_client->dev, @@ -2136,7 +2136,7 @@ static int cs42l42_i2c_probe(struct i2c_client *i2c_client,
ret = cs42l42_handle_device_data(&i2c_client->dev, cs42l42); if (ret != 0) - goto err_disable; + goto err_shutdown;
/* Setup headset detection */ cs42l42_setup_hs_type_detect(cs42l42); @@ -2148,10 +2148,18 @@ static int cs42l42_i2c_probe(struct i2c_client *i2c_client, ret = devm_snd_soc_register_component(&i2c_client->dev, &soc_component_dev_cs42l42, &cs42l42_dai, 1); if (ret < 0) - goto err_disable; + goto err_shutdown; + return 0;
+err_shutdown: + regmap_write(cs42l42->regmap, CS42L42_CODEC_INT_MASK, 0xff); + regmap_write(cs42l42->regmap, CS42L42_TSRS_PLUG_INT_MASK, 0xff); + regmap_write(cs42l42->regmap, CS42L42_PWR_CTL1, 0xff); + err_disable: + gpiod_set_value_cansleep(cs42l42->reset_gpio, 0); +err_disable_noreset: regulator_bulk_disable(ARRAY_SIZE(cs42l42->supplies), cs42l42->supplies); return ret; @@ -2164,6 +2172,14 @@ static int cs42l42_i2c_remove(struct i2c_client *i2c_client) if (i2c_client->irq) devm_free_irq(&i2c_client->dev, i2c_client->irq, cs42l42);
+ /* + * The driver might not have control of reset and power supplies, + * so ensure that the chip internals are powered down. + */ + regmap_write(cs42l42->regmap, CS42L42_CODEC_INT_MASK, 0xff); + regmap_write(cs42l42->regmap, CS42L42_TSRS_PLUG_INT_MASK, 0xff); + regmap_write(cs42l42->regmap, CS42L42_PWR_CTL1, 0xff); + gpiod_set_value_cansleep(cs42l42->reset_gpio, 0); regulator_bulk_disable(ARRAY_SIZE(cs42l42->supplies), cs42l42->supplies);
Relying on devm to free the irq handler on probe failure leaves a small window of opportunity for an interrupt to become pending and then the handler to run after the chip has been reset and powered off.
For safety cs42l42_probe() should free the irq in the error path. As the irq is now disabled by the driver in probe() and remove() there is no point allocating it as a devres-managed item, so convert to plain non-devres.
Signed-off-by: Richard Fitzgerald rf@opensource.cirrus.com --- sound/soc/codecs/cs42l42.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-)
diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c index dc12842ee6e1..1029f6b3eb48 100644 --- a/sound/soc/codecs/cs42l42.c +++ b/sound/soc/codecs/cs42l42.c @@ -2078,17 +2078,16 @@ static int cs42l42_i2c_probe(struct i2c_client *i2c_client,
/* Request IRQ if one was specified */ if (i2c_client->irq) { - ret = devm_request_threaded_irq(&i2c_client->dev, - i2c_client->irq, - NULL, cs42l42_irq_thread, - IRQF_ONESHOT | IRQF_TRIGGER_LOW, - "cs42l42", cs42l42); + ret = request_threaded_irq(i2c_client->irq, + NULL, cs42l42_irq_thread, + IRQF_ONESHOT | IRQF_TRIGGER_LOW, + "cs42l42", cs42l42); if (ret == -EPROBE_DEFER) { - goto err_disable; + goto err_disable_noirq; } else if (ret != 0) { dev_err(&i2c_client->dev, "Failed to request IRQ: %d\n", ret); - goto err_disable; + goto err_disable_noirq; } }
@@ -2158,6 +2157,10 @@ static int cs42l42_i2c_probe(struct i2c_client *i2c_client, regmap_write(cs42l42->regmap, CS42L42_PWR_CTL1, 0xff);
err_disable: + if (i2c_client->irq) + free_irq(i2c_client->irq, cs42l42); + +err_disable_noirq: gpiod_set_value_cansleep(cs42l42->reset_gpio, 0); err_disable_noreset: regulator_bulk_disable(ARRAY_SIZE(cs42l42->supplies), @@ -2170,7 +2173,7 @@ static int cs42l42_i2c_remove(struct i2c_client *i2c_client) struct cs42l42_private *cs42l42 = i2c_get_clientdata(i2c_client);
if (i2c_client->irq) - devm_free_irq(&i2c_client->dev, i2c_client->irq, cs42l42); + free_irq(i2c_client->irq, cs42l42);
/* * The driver might not have control of reset and power supplies,
On Tue, 26 Oct 2021 13:57:20 +0100, Richard Fitzgerald wrote:
Driver probe and remove were inconsistent in what they did to power-down and neither did all steps. In addition to that, neither function prevented the interrupt handler from running during and after power-down.
Richard Fitzgerald (2): ASoC: cs42l42: Reset and power-down on remove() and failed probe() ASoC: cs42l42: free_irq() before powering-down on probe() fail
[...]
Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
Thanks!
[1/2] ASoC: cs42l42: Reset and power-down on remove() and failed probe() commit: 6cb725b8a5cc7b9106d5d6dd5d2ca78c76913775 [2/2] ASoC: cs42l42: free_irq() before powering-down on probe() fail commit: a10148a8cf561d728c0f57994330b2da1df35577
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
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Thanks, Mark
participants (2)
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Mark Brown
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Richard Fitzgerald