linux-kernel - Re: [PATCH v3 2/6] usb: typec: tipd: Split interrupt handler

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Date:   Thu, 30 Sep 2021 13:08:58 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guido Günther <agx@...xcpu.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hector Martin <marcan@...can.st>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Alexander Graf <graf@...zon.com>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>
Subject: Re: [PATCH v3 2/6] usb: typec: tipd: Split interrupt handler

On Tue, Sep 28, 2021 at 05:54:58PM +0200, Sven Peter wrote:
> Split the handlers for the individual interrupts into their own functions
> to prepare for adding a second interrupt handler for the Apple CD321x
> chips
> 
> Signed-off-by: Sven Peter <sven@...npeter.dev>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
> no changes since v2
> 
> changes since v1:
>   - new commit since Heikki suggested to add a separate irq handler
>     for the cd321x variant
> 
>  drivers/usb/typec/tipd/core.c | 96 ++++++++++++++++++++++++-----------
>  1 file changed, 65 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 93e56291f0cf..172715c6c238 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -404,13 +404,69 @@ static const struct typec_operations tps6598x_ops = {
>  	.pr_set = tps6598x_pr_set,
>  };
>  
> +static bool tps6598x_read_status(struct tps6598x *tps, u32 *status)
> +{
> +	int ret;
> +
> +	ret = tps6598x_read32(tps, TPS_REG_STATUS, status);
> +	if (ret) {
> +		dev_err(tps->dev, "%s: failed to read status\n", __func__);
> +		return false;
> +	}
> +	trace_tps6598x_status(*status);
> +
> +	return true;
> +}
> +
> +static bool tps6598x_read_data_status(struct tps6598x *tps)
> +{
> +	u32 data_status;
> +	int ret;
> +
> +	ret = tps6598x_read32(tps, TPS_REG_DATA_STATUS, &data_status);
> +	if (ret < 0) {
> +		dev_err(tps->dev, "failed to read data status: %d\n", ret);
> +		return false;
> +	}
> +	trace_tps6598x_data_status(data_status);
> +
> +	return true;
> +}
> +
> +static bool tps6598x_read_power_status(struct tps6598x *tps)
> +{
> +	u16 pwr_status;
> +	int ret;
> +
> +	ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
> +	if (ret < 0) {
> +		dev_err(tps->dev, "failed to read power status: %d\n", ret);
> +		return false;
> +	}
> +	trace_tps6598x_power_status(pwr_status);
> +
> +	return true;
> +}
> +
> +static void tps6598x_handle_plug_event(struct tps6598x *tps, u32 status)
> +{
> +	int ret;
> +
> +	if (status & TPS_STATUS_PLUG_PRESENT) {
> +		ret = tps6598x_connect(tps, status);
> +		if (ret)
> +			dev_err(tps->dev, "failed to register partner\n");
> +	} else {
> +		tps6598x_disconnect(tps, status);
> +	}
> +}
> +
>  static irqreturn_t tps6598x_interrupt(int irq, void *data)
>  {
>  	struct tps6598x *tps = data;
>  	u64 event1;
>  	u64 event2;
> -	u32 status, data_status;
> -	u16 pwr_status;
> +	u32 status;
>  	int ret;
>  
>  	mutex_lock(&tps->lock);
> @@ -423,42 +479,20 @@ static irqreturn_t tps6598x_interrupt(int irq, void *data)
>  	}
>  	trace_tps6598x_irq(event1, event2);
>  
> -	ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
> -	if (ret) {
> -		dev_err(tps->dev, "%s: failed to read status\n", __func__);
> +	if (!tps6598x_read_status(tps, &status))
>  		goto err_clear_ints;
> -	}
> -	trace_tps6598x_status(status);
>  
> -	if ((event1 | event2) & TPS_REG_INT_POWER_STATUS_UPDATE) {
> -		ret = tps6598x_read16(tps, TPS_REG_POWER_STATUS, &pwr_status);
> -		if (ret < 0) {
> -			dev_err(tps->dev, "failed to read power status: %d\n", ret);
> +	if ((event1 | event2) & TPS_REG_INT_POWER_STATUS_UPDATE)
> +		if (!tps6598x_read_power_status(tps))
>  			goto err_clear_ints;
> -		}
> -		trace_tps6598x_power_status(pwr_status);
> -	}
>  
> -	if ((event1 | event2) & TPS_REG_INT_DATA_STATUS_UPDATE) {
> -		ret = tps6598x_read32(tps, TPS_REG_DATA_STATUS, &data_status);
> -		if (ret < 0) {
> -			dev_err(tps->dev, "failed to read data status: %d\n", ret);
> +	if ((event1 | event2) & TPS_REG_INT_DATA_STATUS_UPDATE)
> +		if (!tps6598x_read_data_status(tps))
>  			goto err_clear_ints;
> -		}
> -		trace_tps6598x_data_status(data_status);
> -	}
>  
>  	/* Handle plug insert or removal */
> -	if ((event1 | event2) & TPS_REG_INT_PLUG_EVENT) {
> -		if (status & TPS_STATUS_PLUG_PRESENT) {
> -			ret = tps6598x_connect(tps, status);
> -			if (ret)
> -				dev_err(tps->dev,
> -					"failed to register partner\n");
> -		} else {
> -			tps6598x_disconnect(tps, status);
> -		}
> -	}
> +	if ((event1 | event2) & TPS_REG_INT_PLUG_EVENT)
> +		tps6598x_handle_plug_event(tps, status);
>  
>  err_clear_ints:
>  	tps6598x_write64(tps, TPS_REG_INT_CLEAR1, event1);
> -- 
> 2.25.1

thanks,

-- 
heikki