Re: [PATCH] extcon: usbc-tusb320: make sure the state is initialized on probe

From: Chanwoo Choi
Date: Wed Jun 29 2022 - 15:54:43 EST


On 22. 6. 23. 20:21, Peter Rosin wrote:
> When the port is connected at boot, there is not necessarily
> an interrupt flagged in the interrupt status register, causing
> the IRQ handler to bail out early without reading the state when
> it is invoked directly from probe.
>
> Add a flag that overrides the interrupt status register and reads
> the state regardless during probe.
>
> Fixes: 06bc4ca115cd ("extcon: Add driver for TI TUSB320")
> Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
> ---
> drivers/extcon/extcon-usbc-tusb320.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/extcon/extcon-usbc-tusb320.c b/drivers/extcon/extcon-usbc-tusb320.c
> index 6ba3d89b106d..bd3645ae0d52 100644
> --- a/drivers/extcon/extcon-usbc-tusb320.c
> +++ b/drivers/extcon/extcon-usbc-tusb320.c
> @@ -55,6 +55,7 @@ struct tusb320_priv {
> struct extcon_dev *edev;
> struct tusb320_ops *ops;
> enum tusb320_attached_state state;
> + bool initialized;
> };
>
> static const char * const tusb_attached_states[] = {
> @@ -195,7 +196,7 @@ static irqreturn_t tusb320_irq_handler(int irq, void *dev_id)
> return IRQ_NONE;
> }
>
> - if (!(reg & TUSB320_REG9_INTERRUPT_STATUS))
> + if (priv->initialized && !(reg & TUSB320_REG9_INTERRUPT_STATUS))
> return IRQ_NONE;
>
> state = (reg >> TUSB320_REG9_ATTACHED_STATE_SHIFT) &
> @@ -297,6 +298,8 @@ static int tusb320_extcon_probe(struct i2c_client *client,
> */
> tusb320_irq_handler(client->irq, priv);
>
> + priv->initialized = true;
> +

After initializing as 'priv->initialized = true',
tusb320_irq_handler() is not anymore detecting the external connector changes.

If external connector is detached after finished kernel boot,
how to change the state of external connector by using extcon_set_state()?

--
Best Regards,
Samsung Electronics
Chanwoo Choi