On Tue, Jan 7, 2020 at 11:24 PM Nicolas Boichat <drinkcat@xxxxxxxxxxxx> wrote:
>
> The Bifrost GPU on MT8183 uses 2 regulators (core and SRAM) for
> devfreq, and provides OPP table with 2 sets of voltages.
>
> TODO: This is incomplete as we'll need add support for setting
> a pair of voltages as well.
>
> Signed-off-by: Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/panfrost/panfrost_devfreq.c | 18 ++++++++++++++++++
> drivers/gpu/drm/panfrost/panfrost_device.h | 2 ++
> 2 files changed, 20 insertions(+)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> index 413987038fbfccb..5eb0effded7eb09 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> @@ -79,6 +79,22 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> struct devfreq *devfreq;
> struct thermal_cooling_device *cooling;
>
> + /* If we have 2 regulator, we need an OPP table with 2 voltages. */
> + if (pfdev->regulator_sram) {
> + const char * const reg_names[] = { "mali", "sram" };
> +
> + pfdev->devfreq.dev_opp_table =
> + dev_pm_opp_set_regulators(dev,
> + reg_names, ARRAY_SIZE(reg_names));
> + if (IS_ERR(pfdev->devfreq.dev_opp_table)) {
> + ret = PTR_ERR(pfdev->devfreq.dev_opp_table);
> + pfdev->devfreq.dev_opp_table = NULL;
> + dev_err(dev,
> + "Failed to init devfreq opp table: %d\n", ret);
> + return ret;
> + }
> + }
> +
> ret = dev_pm_opp_of_add_table(dev);
> if (ret == -ENODEV) /* Optional, continue without devfreq */
> return 0;
> @@ -119,6 +135,8 @@ 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.dev_opp_table)
> + dev_pm_opp_put_regulators(pfdev->devfreq.dev_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 92d471676fc7823..581da3fe5df8b17 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -91,10 +91,12 @@ struct panfrost_device {
> struct {
> struct devfreq *devfreq;
> struct thermal_cooling_device *cooling;
> + struct opp_table *dev_opp_table;
> ktime_t busy_time;
> ktime_t idle_time;
> ktime_t time_last_update;
> atomic_t busy_count;
> + struct panfrost_devfreq_slot slot[NUM_JOB_SLOTS];
?? Left over from some rebase?
Rob
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