On Wed, Jan 12, 2022 at 12:23:09AM +0100, Hans de Goede wrote:
> The driver as originally submitted accidentally relied on Android having
> run before and Android having unmasked the 2nd level IRQ-mask for the
> charger IRQ. This worked since these are PMIC registers which are only
> reset when the battery is fully drained or disconnected.
Correct me if I'm wrong but Android is a usermode stack. It cannot unmask
IRQ's form user mode.
I'm guessing the persistant PMIC registeres where set when running a vendor
kernel that was in use with Anroid prior to installing one using this change
and a modern kernel, and after the batteries ran out or where removed the
charger didn't work.
--mark
>
> Fix the charger IRQ no longer working after loss of battery power by
> properly setting the 2nd level IRQ-mask for the charger IRQ.
>
> Note this removes the need to enable/disable our parent IRQ which just
> sets the mask bit in the 1st level IRQ-mask register, setting one of
> the 2 level masks is enough to stop the IRQ from getting reported.
>
> Fixes: 761db353d9e2 ("platform/x86: Add intel_crystal_cove_charger driver")
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> .../platform/x86/intel/crystal_cove_charger.c | 26 +++++++++----------
> 1 file changed, 13 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/platform/x86/intel/crystal_cove_charger.c b/drivers/platform/x86/intel/crystal_cove_charger.c
> index 0374bc742513..eeaa926d2058 100644
> --- a/drivers/platform/x86/intel/crystal_cove_charger.c
> +++ b/drivers/platform/x86/intel/crystal_cove_charger.c
> @@ -17,6 +17,7 @@
> #include <linux/regmap.h>
>
> #define CHGRIRQ_REG 0x0a
> +#define MCHGRIRQ_REG 0x17
>
> struct crystal_cove_charger_data {
> struct mutex buslock; /* irq_bus_lock */
> @@ -25,8 +26,8 @@ struct crystal_cove_charger_data {
> struct irq_domain *irq_domain;
> int irq;
> int charger_irq;
> - bool irq_enabled;
> - bool irq_is_enabled;
> + u8 mask;
> + u8 new_mask;
> };
>
> static irqreturn_t crystal_cove_charger_irq(int irq, void *data)
> @@ -53,13 +54,9 @@ static void crystal_cove_charger_irq_bus_sync_unlock(struct irq_data *data)
> {
> struct crystal_cove_charger_data *charger = irq_data_get_irq_chip_data(data);
>
> - if (charger->irq_is_enabled != charger->irq_enabled) {
> - if (charger->irq_enabled)
> - enable_irq(charger->irq);
> - else
> - disable_irq(charger->irq);
> -
> - charger->irq_is_enabled = charger->irq_enabled;
> + if (charger->mask != charger->new_mask) {
> + regmap_write(charger->regmap, MCHGRIRQ_REG, charger->new_mask);
> + charger->mask = charger->new_mask;
> }
>
> mutex_unlock(&charger->buslock);
> @@ -69,14 +66,14 @@ static void crystal_cove_charger_irq_unmask(struct irq_data *data)
> {
> struct crystal_cove_charger_data *charger = irq_data_get_irq_chip_data(data);
>
> - charger->irq_enabled = true;
> + charger->new_mask &= ~BIT(data->hwirq);
> }
>
> static void crystal_cove_charger_irq_mask(struct irq_data *data)
> {
> struct crystal_cove_charger_data *charger = irq_data_get_irq_chip_data(data);
>
> - charger->irq_enabled = false;
> + charger->new_mask |= BIT(data->hwirq);
> }
>
> static void crystal_cove_charger_rm_irq_domain(void *data)
> @@ -130,10 +127,13 @@ static int crystal_cove_charger_probe(struct platform_device *pdev)
> irq_set_nested_thread(charger->charger_irq, true);
> irq_set_noprobe(charger->charger_irq);
>
> + /* Mask the single 2nd level IRQ before enabling the 1st level IRQ */
> + charger->mask = BIT(0);
> + regmap_write(charger->regmap, MCHGRIRQ_REG, charger->mask);
> +
> ret = devm_request_threaded_irq(&pdev->dev, charger->irq, NULL,
> crystal_cove_charger_irq,
> - IRQF_ONESHOT | IRQF_NO_AUTOEN,
> - KBUILD_MODNAME, charger);
> + IRQF_ONESHOT, KBUILD_MODNAME, charger);
> if (ret)
> return dev_err_probe(&pdev->dev, ret, "requesting irq\n");
>
> --
> 2.33.1
>
