linux-kernel - Re: [PATCH] omap3isp: wait for regulators to come up

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Date:   Thu, 02 Mar 2017 16:46:42 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Pavel Machek <pavel@....cz>
Cc:     Sakari Ailus <sakari.ailus@....fi>, mchehab@...nel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        ivo.g.dimitrov.75@...il.com, sre@...nel.org, pali.rohar@...il.com,
        linux-media@...r.kernel.org
Subject: Re: [PATCH] omap3isp: wait for regulators to come up

Hi Pavel,

Thank you for the patch.

On Thursday 02 Mar 2017 13:45:32 Pavel Machek wrote:
> If regulator returns -EPROBE_DEFER, we need to return it too, so that
> omap3isp will be re-probed when regulator is ready.
> 
> Signed-off-by: Pavel Machek <pavel@....cz>
> 
> diff --git a/drivers/media/platform/omap3isp/ispccp2.c
> b/drivers/media/platform/omap3isp/ispccp2.c index ca09523..b6e055e 100644
> --- a/drivers/media/platform/omap3isp/ispccp2.c
> +++ b/drivers/media/platform/omap3isp/ispccp2.c
> @@ -1137,10 +1159,12 @@ int omap3isp_ccp2_init(struct isp_device *isp)
>  	if (isp->revision == ISP_REVISION_2_0) {
>  		ccp2->vdds_csib = devm_regulator_get(isp->dev, "vdds_csib");
>  		if (IS_ERR(ccp2->vdds_csib)) {
> +			if (PTR_ERR(ccp2->vdds_csib) == -EPROBE_DEFER)
> +				return -EPROBE_DEFER;

This looks good to me, but it will result in the caller printing a "CCP2 
initialization failed" error message, which I'm not sure is right. Maybe we 
should move that message to the omap3isp_ccp2_init() function ?

In any case, this change is fine, so

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

>  			dev_dbg(isp->dev,
>  				"Could not get regulator vdds_csib\n");
>  			ccp2->vdds_csib = NULL;
>  		}
>  	} else if (isp->revision == ISP_REVISION_15_0) {
>  		ccp2->phy = &isp->isp_csiphy1;
>  	}

-- 
Regards,

Laurent Pinchart