From 27b9d46d25c873b351757c44ce523bf0ede1d08e Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Mon, 14 Aug 2017 11:02:59 +0200 Subject: [PATCH 2/2] power: supply: max17042_battery: Fix ACPI interrupt issues On some x86/ACPI boards the DSDT defines an ACPI event handler for the max17047 IRQ, this causes several problems: 1) We need to share the IRQ to avoid an error getting it 2) Even of we are willing to share, we may fail to share because some DSDTs claim it exclusivly 3) If we are unable to share the IRQ, or the IRQ is only listed as an ACPI event source and not in the max1704 firmware node, then the charge threshold IRQ (which is used to give an IRQ every 1 percent charge change) becomes a problem, the ACPI event handler will not update this to the next 1 percent threshold, so the IRQ keeps firing and we get an IRQ storm pegging 1 CPU core. This happens despite the max17042 driver not setting the charge threshold because Windows uses it and leaves it set on reboot. So if we are unable to get the IRQ we need to reprogram the charge threshold to its disabled setting. This commit fixes al of the above, while at it it also makes the error msg when being unable to get the IRQ consistent with other messages. Signed-off-by: Hans de Goede --- drivers/power/supply/max17042_battery.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c index b2ddb7eb69c6..18a44e4ed6ff 100644 --- a/drivers/power/supply/max17042_battery.c +++ b/drivers/power/supply/max17042_battery.c @@ -1050,11 +1050,18 @@ static int max17042_probe(struct i2c_client *client, } if (client->irq) { + unsigned int flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT; + + /* + * On ACPI systems the IRQ may be handled by ACPI-event code, + * so we need to share (if the ACPI code is willing to share). + */ + if (acpi_id) + flags |= IRQF_SHARED | IRQF_PROBE_SHARED; + ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, - max17042_thread_handler, - IRQF_TRIGGER_FALLING | - IRQF_ONESHOT, + max17042_thread_handler, flags, chip->battery->desc->name, chip); if (!ret) { @@ -1064,10 +1071,13 @@ static int max17042_probe(struct i2c_client *client, max17042_set_soc_threshold(chip, 1); } else { client->irq = 0; - dev_err(&client->dev, "%s(): cannot get IRQ\n", - __func__); + if (ret != -EBUSY) + dev_err(&client->dev, "Failed to get IRQ\n"); } } + /* Not able to update the charge threshold when exceeded? -> disable */ + if (!client->irq) + regmap_write(chip->regmap, MAX17042_SALRT_Th, 0xff00); regmap_read(chip->regmap, MAX17042_STATUS, &val); if (val & STATUS_POR_BIT) { -- 2.13.4