linux-kernel - Re: [PATCH 09/17] media: camss: csid: allow csid to work without a regulator

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Date:   Thu, 10 Jun 2021 10:01:38 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Jonathan Marek <jonathan@...ek.ca>
Cc:     MSM <linux-arm-msm@...r.kernel.org>,
        Andrey Konovalov <andrey.konovalov@...aro.org>,
        Todor Tomov <todor.too@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "open list:QUALCOMM CAMERA SUBSYSTEM DRIVER" 
        <linux-media@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/17] media: camss: csid: allow csid to work without a regulator

Hey Jonathan,

On Wed, 9 Jun 2021 at 00:37, Jonathan Marek <jonathan@...ek.ca> wrote:
>
> At least for titan HW, CSID don't have an associated regulator. This change
> is necessary to be able to model this in the CSID resources.
>
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> Reviewed-by: Robert Foss <robert.foss@...aro.org>
> ---
>  drivers/media/platform/qcom/camss/camss-csid.c | 17 +++++++++++------
>  1 file changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/camss/camss-csid.c b/drivers/media/platform/qcom/camss/camss-csid.c
> index cc11fbfdae132..528674dea06ca 100644
> --- a/drivers/media/platform/qcom/camss/camss-csid.c
> +++ b/drivers/media/platform/qcom/camss/camss-csid.c
> @@ -162,7 +162,7 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
>                         return ret;
>                 }
>
> -               ret = regulator_enable(csid->vdda);
> +               ret = csid->vdda ? regulator_enable(csid->vdda) : 0;
>                 if (ret < 0) {
>                         pm_runtime_put_sync(dev);
>                         return ret;
> @@ -170,14 +170,16 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
>
>                 ret = csid_set_clock_rates(csid);
>                 if (ret < 0) {
> -                       regulator_disable(csid->vdda);
> +                       if (csid->vdda)
> +                               regulator_disable(csid->vdda);
>                         pm_runtime_put_sync(dev);
>                         return ret;
>                 }
>
>                 ret = camss_enable_clocks(csid->nclocks, csid->clock, dev);
>                 if (ret < 0) {
> -                       regulator_disable(csid->vdda);
> +                       if (csid->vdda)
> +                               regulator_disable(csid->vdda);
>                         pm_runtime_put_sync(dev);
>                         return ret;
>                 }
> @@ -188,7 +190,8 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
>                 if (ret < 0) {
>                         disable_irq(csid->irq);
>                         camss_disable_clocks(csid->nclocks, csid->clock);
> -                       regulator_disable(csid->vdda);
> +                       if (csid->vdda)
> +                               regulator_disable(csid->vdda);
>                         pm_runtime_put_sync(dev);
>                         return ret;
>                 }
> @@ -197,7 +200,7 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
>         } else {
>                 disable_irq(csid->irq);
>                 camss_disable_clocks(csid->nclocks, csid->clock);
> -               ret = regulator_disable(csid->vdda);
> +               ret = csid->vdda ? regulator_disable(csid->vdda) : 0;
>                 pm_runtime_put_sync(dev);
>         }
>
> @@ -634,7 +637,9 @@ int msm_csid_subdev_init(struct camss *camss, struct csid_device *csid,
>
>         /* Regulator */
>
> -       csid->vdda = devm_regulator_get(dev, res->regulator[0]);
> +       csid->vdda = NULL;
> +       if (res->regulator[0])
> +               csid->vdda = devm_regulator_get(dev, res->regulator[0]);
>         if (IS_ERR(csid->vdda)) {
>                 dev_err(dev, "could not get regulator\n");
>                 return PTR_ERR(csid->vdda);
> --
> 2.26.1
>

This patch does not seem to apply on upstream-media/master.