On Thu, Sep 05, 2024 at 08:53:28AM +0200, Parth Pancholi wrote:
> From: Emanuele Ghidoli <emanuele.ghidoli@xxxxxxxxxxx>
>
> TCPCI USB PHY - PTN5110 could be used with SOCs that only support
> the edge-triggered GPIO interrupts such as TI's K3 device AM69.
> Move the interrupt configuration to the firmware which would
> allow to accommodate edge triggered interrupts for such SOCs.
> In order to support the edge interrupts, register irq line in advance
> and keep track of occurrence during port registering.
>
> When the edge interrupts are used, it is observed that some of the
> interrupts are missed when tcpci_irq() is serving the current
> interrupt. Therefore, check the status register at the end of
> tcpci_irq() and re-run the function if the status is not clear
> i.e. pending interrupt.
>
> Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@xxxxxxxxxxx>
> Signed-off-by: Parth Pancholi <parth.pancholi@xxxxxxxxxxx>
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
> v2: Re-enable irq irrespective of tcpci_register_port() return status which was disabled before this call
> ---
> drivers/usb/typec/tcpm/tcpci.c | 30 ++++++++++++++++++++----------
> 1 file changed, 20 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
> index a2651a2a7f2e..ed32583829be 100644
> --- a/drivers/usb/typec/tcpm/tcpci.c
> +++ b/drivers/usb/typec/tcpm/tcpci.c
> @@ -707,10 +707,13 @@ irqreturn_t tcpci_irq(struct tcpci *tcpci)
> {
> u16 status;
> int ret;
> + int irq_ret;
> unsigned int raw;
>
> tcpci_read16(tcpci, TCPC_ALERT, &status);
> + irq_ret = status & tcpci->alert_mask;
>
> +process_status:
> /*
> * Clear alert status for everything except RX_STATUS, which shouldn't
> * be cleared until we have successfully retrieved message.
> @@ -783,7 +786,12 @@ irqreturn_t tcpci_irq(struct tcpci *tcpci)
> else if (status & TCPC_ALERT_TX_FAILED)
> tcpm_pd_transmit_complete(tcpci->port, TCPC_TX_FAILED);
>
> - return IRQ_RETVAL(status & tcpci->alert_mask);
> + tcpci_read16(tcpci, TCPC_ALERT, &status);
> +
> + if (status & tcpci->alert_mask)
> + goto process_status;
> +
> + return IRQ_RETVAL(irq_ret);
> }
> EXPORT_SYMBOL_GPL(tcpci_irq);
>
> @@ -915,20 +923,22 @@ static int tcpci_probe(struct i2c_client *client)
>
> chip->data.set_orientation = err;
>
> - chip->tcpci = tcpci_register_port(&client->dev, &chip->data);
> - if (IS_ERR(chip->tcpci))
> - return PTR_ERR(chip->tcpci);
> -
> err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
> _tcpci_irq,
> - IRQF_SHARED | IRQF_ONESHOT | IRQF_TRIGGER_LOW,
> + IRQF_SHARED | IRQF_ONESHOT,
> dev_name(&client->dev), chip);
> - if (err < 0) {
> - tcpci_unregister_port(chip->tcpci);
> + if (err < 0)
> return err;
> - }
>
> - return 0;
> + /*
> + * Disable irq while registering port. If irq is configured as an edge
> + * irq this allow to keep track and process the irq as soon as it is enabled.
> + */
> + disable_irq(client->irq);
> + chip->tcpci = tcpci_register_port(&client->dev, &chip->data);
> + enable_irq(client->irq);
> +
> + return PTR_ERR_OR_ZERO(chip->tcpci);
> }
>
> static void tcpci_remove(struct i2c_client *client)
> --
> 2.34.1
--
heikki
