linux-kernel - Re: [PATCH v1] ata: ahci_brcm: Fix use of BCM7216 reset controller

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Message-ID: <152067ee-4cc0-f94a-0321-8125817c8bbf@gmail.com>
Date:   Mon, 24 Aug 2020 13:44:04 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Jim Quinlan <james.quinlan@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com
Cc:     Jens Axboe <axboe@...nel.dk>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] ata: ahci_brcm: Fix use of BCM7216 reset controller

Hi Jim,

On 8/24/20 1:40 PM, Jim Quinlan wrote:
> From: Jim Quinlan <jquinlan@...adcom.com>
> 
> A reset controller "rescal" is shared between the AHCI driver and the PCIe
> driver for the BrcmSTB 7216 chip.  Use
> devm_reset_control_get_optional_shared() to handle this sharing.
> 
> Fixes: 272ecd60a636 ("ata: ahci_brcm: BCM7216 reset is self de-asserting")
> Fixes: c345ec6a50e9 ("ata: ahci_brcm: Support BCM7216 reset controller name")
> Signed-off-by: Jim Quinlan <jquinlan@...adcom.com>
> ---
>  drivers/ata/ahci_brcm.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/ata/ahci_brcm.c b/drivers/ata/ahci_brcm.c
> index 6853dbb4131d..d6115bc04b09 100644
> --- a/drivers/ata/ahci_brcm.c
> +++ b/drivers/ata/ahci_brcm.c
> @@ -428,7 +428,6 @@ static int brcm_ahci_probe(struct platform_device *pdev)
>  {
>  	const struct of_device_id *of_id;
>  	struct device *dev = &pdev->dev;
> -	const char *reset_name = NULL;
>  	struct brcm_ahci_priv *priv;
>  	struct ahci_host_priv *hpriv;
>  	struct resource *res;
> @@ -452,11 +451,10 @@ static int brcm_ahci_probe(struct platform_device *pdev)
>  
>  	/* Reset is optional depending on platform and named differently */
>  	if (priv->version == BRCM_SATA_BCM7216)
> -		reset_name = "rescal";
> +		priv->rcdev = devm_reset_control_get_optional_shared(&pdev->dev, "rescal");
>  	else
> -		reset_name = "ahci";
> +		priv->rcdev = devm_reset_control_get_optional(&pdev->dev, "ahci");
>  
> -	priv->rcdev = devm_reset_control_get_optional(&pdev->dev, reset_name);
>  	if (IS_ERR(priv->rcdev))
>  		return PTR_ERR(priv->rcdev);
>  
> @@ -479,10 +477,7 @@ static int brcm_ahci_probe(struct platform_device *pdev)
>  		break;
>  	}
>  
> -	if (priv->version == BRCM_SATA_BCM7216)
> -		ret = reset_control_reset(priv->rcdev);
> -	else
> -		ret = reset_control_deassert(priv->rcdev);
> +	ret = reset_control_deassert(priv->rcdev);
>  	if (ret)
>  		return ret;

We are missing an equivalent path in the brcm_ahci_resume() function,
with that fixed:

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian