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SubjectRe: [PATCH v2 1/2] ata: ahci_brcm: Perform reset after obtaining resources
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Hi Florian,

On Mon, 2020-01-06 at 11:19 -0800, Florian Fainelli wrote:
> Resources such as clocks, PHYs, regulators are likely to get a probe
> deferral return code, which could lead to the AHCI controller being
> reset a few times until it gets successfully probed. Since this is
> typically the most time consuming operation, move it after the resources
> have been acquired.
>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
> drivers/ata/ahci_brcm.c | 14 ++++++--------
> 1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/ata/ahci_brcm.c b/drivers/ata/ahci_brcm.c
> index 13ceca687104..70e3e386d52e 100644
> --- a/drivers/ata/ahci_brcm.c
> +++ b/drivers/ata/ahci_brcm.c
> @@ -453,15 +453,9 @@ static int brcm_ahci_probe(struct platform_device *pdev)
> else
> reset_name = "ahci";
>
> - priv->rcdev = devm_reset_control_get(&pdev->dev, reset_name);
> - if (!IS_ERR_OR_NULL(priv->rcdev))
> - reset_control_deassert(priv->rcdev);
> -
> hpriv = ahci_platform_get_resources(pdev, 0);
> - if (IS_ERR(hpriv)) {
> - ret = PTR_ERR(hpriv);
> - goto out_reset;
> - }
> + if (IS_ERR(hpriv))
> + return PTR_ERR(hpriv);
>
> hpriv->plat_data = priv;
> hpriv->flags = AHCI_HFLAG_WAKE_BEFORE_STOP | AHCI_HFLAG_NO_WRITE_TO_RO;
> @@ -478,6 +472,10 @@ static int brcm_ahci_probe(struct platform_device *pdev)
> break;
> }
>
> + priv->rcdev = devm_reset_control_get(&pdev->dev, reset_name);
> + if (!IS_ERR_OR_NULL(priv->rcdev))
> + reset_control_deassert(priv->rcdev);
> +

Please use devm_reset_control_get_optional_exclusive(), that returns
NULL if the requested reset is not specified in the device tree. Do
return the error code on IS_ERR(). You can then call
reset_control_deassert() unconditionally, it checks for and ignores
the NULL pointer.

regards
Philipp

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