linux-kernel - Re: [PATCH v9 06/14] USB: typec: tps6598x: Clear dead battery flag

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Date:   Tue, 3 Oct 2023 09:03:42 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Abdel Alkuor <alkuor@...il.com>
Cc:     krzysztof.kozlowski+dt@...aro.org, bryan.odonoghue@...aro.org,
        gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, ryan.eleceng@...il.com,
        robh+dt@...nel.org, conor+dt@...nel.org,
        devicetree@...r.kernel.org, Abdel Alkuor <abdelalkuor@...tab.com>
Subject: Re: [PATCH v9 06/14] USB: typec: tps6598x: Clear dead battery flag

On Sun, Oct 01, 2023 at 04:11:26AM -0400, Abdel Alkuor wrote:
> From: Abdel Alkuor <abdelalkuor@...tab.com>
> 
> Dead battery flag must be cleared after switching tps25750 to APP mode
> so the PD controller becomes fully functional.
> 
> Signed-off-by: Abdel Alkuor <abdelalkuor@...tab.com>

I'm sorry I noticed these so late, but this one really feels like it
should be part of the patch 4/14. Is there some reason why you do this
separately?

> ---
> Changes in v9:
>   - No changes
> Changes in v8:
>   - No changes
> Changes in v7:
>   - Add driver name to commit subject
> Changes in v6:
>   - No changes
> Changes in v5:
>   - Incorporating tps25750 into tps6598x driver
> 
>  drivers/usb/typec/tipd/core.c     | 16 ++++++++++++++++
>  drivers/usb/typec/tipd/tps6598x.h |  1 +
>  2 files changed, 17 insertions(+)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 21b0ea2c9627..2598433a69cf 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -946,6 +946,22 @@ static int tps25750_apply_patch(struct tps6598x *tps)
>  
>  	} while (ret != TPS_MODE_APP);
>  
> +	/*
> +	 * The dead battery flag may be triggered when the controller
> +	 * port is connected to a device that can source power and
> +	 * attempts to power up both the controller and the board it is on.
> +	 * To restore controller functionality, it is necessary to clear
> +	 * this flag
> +	 */
> +	if (status & TPS_BOOT_STATUS_DEAD_BATTERY_FLAG) {
> +		ret = tps6598x_exec_cmd(tps, "DBfg", 0, NULL, 0, NULL);
> +		if (ret) {
> +			dev_err(tps->dev,
> +				"failed to clear dead battery %d\n", ret);

One line is enough.

> +			return ret;
> +		}
> +	}
> +
>  	dev_info(tps->dev, "controller switched to \"APP\" mode\n");
>  
>  	return 0;
> diff --git a/drivers/usb/typec/tipd/tps6598x.h b/drivers/usb/typec/tipd/tps6598x.h
> index a80d0929f3ee..c000170f4547 100644
> --- a/drivers/usb/typec/tipd/tps6598x.h
> +++ b/drivers/usb/typec/tipd/tps6598x.h
> @@ -200,6 +200,7 @@
>  #define TPS_DATA_STATUS_DP_SPEC_PIN_ASSIGNMENT_B    (BIT(2) | BIT(1))
>  
>  /* BOOT STATUS REG*/
> +#define TPS_BOOT_STATUS_DEAD_BATTERY_FLAG	BIT(2)
>  #define TPS_BOOT_STATUS_I2C_EEPROM_PRESENT	BIT(3)
>  
>  #endif /* __TPS6598X_H__ */
> -- 
> 2.34.1

Br,

-- 
heikki