linux-kernel - Re: [PATCH v2 1/1] extcon: intel-mrfld: Sync hardware and software state on init

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Date:   Thu, 20 May 2021 10:40:22 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Ferry Toth <ftoth@...londelft.nl>, linux-kernel@...r.kernel.org
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 1/1] extcon: intel-mrfld: Sync hardware and software
 state on init

On 5/19/21 6:27 AM, Ferry Toth wrote:
> extcon driver for Basin Cove PMIC shadows the switch status used for dwc3
> DRD to detect a change in the switch position. This change initializes the
> status at probe time.
> 
> Signed-off-by: Ferry Toth <ftoth@...londelft.nl>
> Fixes: 492929c54791 ("extcon: mrfld: Introduce extcon driver for Basin Cove PMIC")
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Cc: stable@...r.kernel.org
> ---
> 
> v2:
>  - Clarified patch title (Chanwoo)
> ---
>  drivers/extcon/extcon-intel-mrfld.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/extcon/extcon-intel-mrfld.c b/drivers/extcon/extcon-intel-mrfld.c
> index f47016fb28a8..cd1a5f230077 100644
> --- a/drivers/extcon/extcon-intel-mrfld.c
> +++ b/drivers/extcon/extcon-intel-mrfld.c
> @@ -197,6 +197,7 @@ static int mrfld_extcon_probe(struct platform_device *pdev)
>  	struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
>  	struct regmap *regmap = pmic->regmap;
>  	struct mrfld_extcon_data *data;
> +	unsigned int status;
>  	unsigned int id;
>  	int irq, ret;
>  
> @@ -244,6 +245,14 @@ static int mrfld_extcon_probe(struct platform_device *pdev)
>  	/* Get initial state */
>  	mrfld_extcon_role_detect(data);
>  
> +	/*
> +	 * Cached status value is used for cable detection, see comments
> +	 * in mrfld_extcon_cable_detect(), we need to sync cached value
> +	 * with a real state of the hardware.
> +	 */
> +	regmap_read(regmap, BCOVE_SCHGRIRQ1, &status);
> +	data->status = status;
> +
>  	mrfld_extcon_clear(data, BCOVE_MIRQLVL1, BCOVE_LVL1_CHGR);
>  	mrfld_extcon_clear(data, BCOVE_MCHGRIRQ1, BCOVE_CHGRIRQ_ALL);
>  
> 

Applied it. Thanks.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics