On 07/01/2020 23:06, Martin Blumenstingl wrote:
> dev_pm_opp_set_rate() needs a reference to the regulator which should be
> updated when updating the GPU frequency. The name of the regulator has
> to be passed at initialization-time using dev_pm_opp_set_regulators().
> Add the call to dev_pm_opp_set_regulators() so dev_pm_opp_set_rate()
> will update the GPU regulator when updating the frequency (just like
> we did this manually before when we open-coded dev_pm_opp_set_rate()).
This patch causes a warning from debugfs on my firefly (RK3288) board:
debugfs: Directory 'ffa30000.gpu-mali' with parent 'vdd_gpu' already
present!
So it looks like the regulator is being added twice - but I haven't
investigated further.
> Fixes: 221bc77914cbcc ("drm/panfrost: Use generic code for devfreq")
> Reported-by: Robin Murphy <robin.murphy@xxxxxxx>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/panfrost/panfrost_devfreq.c | 22 ++++++++++++++++++++-
> drivers/gpu/drm/panfrost/panfrost_device.h | 1 +
> 2 files changed, 22 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> index 170f6c8c9651..4f7999c7b44c 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> @@ -74,6 +74,7 @@ static struct devfreq_dev_profile panfrost_devfreq_profile = {
> int panfrost_devfreq_init(struct panfrost_device *pfdev)
> {
> int ret;
> + struct opp_table *opp_table;
> struct dev_pm_opp *opp;
> unsigned long cur_freq;
> struct device *dev = &pfdev->pdev->dev;
> @@ -84,9 +85,24 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> /* Optional, continue without devfreq */
> return 0;
>
> + opp_table = dev_pm_opp_set_regulators(dev,
> + (const char *[]){ "mali" },
> + 1);
> + if (IS_ERR(opp_table)) {
> + ret = PTR_ERR(opp_table);
> +
> + /* Continue if the optional regulator is missing */
> + if (ret != -ENODEV)
> + return ret;
> + } else {
> + pfdev->devfreq.regulators_opp_table = opp_table;
> + }
> +
> ret = dev_pm_opp_of_add_table(dev);
> - if (ret)
> + if (ret) {
> + dev_pm_opp_put_regulators(pfdev->devfreq.regulators_opp_table);
If we don't have a regulator then regulators_opp_table will be NULL and
sadly dev_pm_opp_put_regulators() doesn't handle a NULL argument. The
same applies to the two below calls obviously.
Steve
> return ret;
> + }
>
> panfrost_devfreq_reset(pfdev);
>
> @@ -95,6 +111,7 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> opp = devfreq_recommended_opp(dev, &cur_freq, 0);
> if (IS_ERR(opp)) {
> dev_pm_opp_of_remove_table(dev);
> + dev_pm_opp_put_regulators(pfdev->devfreq.regulators_opp_table);
> return PTR_ERR(opp);
> }
>
> @@ -106,6 +123,7 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> if (IS_ERR(devfreq)) {
> DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
> dev_pm_opp_of_remove_table(dev);
> + dev_pm_opp_put_regulators(pfdev->devfreq.regulators_opp_table);
> return PTR_ERR(devfreq);
> }
> pfdev->devfreq.devfreq = devfreq;
> @@ -124,6 +142,8 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
> if (pfdev->devfreq.cooling)
> devfreq_cooling_unregister(pfdev->devfreq.cooling);
> dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
> + if (pfdev->devfreq.regulators_opp_table)
> + dev_pm_opp_put_regulators(pfdev->devfreq.regulators_opp_table);
> }
>
> void panfrost_devfreq_resume(struct panfrost_device *pfdev)
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> index 06713811b92c..4878b239e301 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -85,6 +85,7 @@ struct panfrost_device {
>
> struct {
> struct devfreq *devfreq;
> + struct opp_table *regulators_opp_table;
> struct thermal_cooling_device *cooling;
> ktime_t busy_time;
> ktime_t idle_time;
>
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