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SubjectRe: [PATCH RFT v1 1/3] drm/panfrost: enable devfreq based the "operating-points-v2" property
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On 07/01/2020 11:06 pm, Martin Blumenstingl wrote:
> Decouple the check to see whether we want to enable devfreq for the GPU
> from dev_pm_opp_set_regulators(). This is preparation work for adding
> back support for regulator control (which means we need to call
> dev_pm_opp_set_regulators() before dev_pm_opp_of_add_table(), which
> means having a check for "is devfreq enabled" that is not tied to
> dev_pm_opp_of_add_table() makes things easier).

Hmm, what about cases like the SCMI DVFS protocol where the OPPs are
dynamically discovered rather than statically defined in DT?

Robin.

> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
> drivers/gpu/drm/panfrost/panfrost_devfreq.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> index 413987038fbf..1471588763ce 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> @@ -5,6 +5,7 @@
> #include <linux/platform_device.h>
> #include <linux/pm_opp.h>
> #include <linux/clk.h>
> +#include <linux/property.h>
> #include <linux/regulator/consumer.h>
>
> #include "panfrost_device.h"
> @@ -79,10 +80,12 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> struct devfreq *devfreq;
> struct thermal_cooling_device *cooling;
>
> - ret = dev_pm_opp_of_add_table(dev);
> - if (ret == -ENODEV) /* Optional, continue without devfreq */
> + if (!device_property_present(dev, "operating-points-v2"))
> + /* Optional, continue without devfreq */
> return 0;
> - else if (ret)
> +
> + ret = dev_pm_opp_of_add_table(dev);
> + if (ret)
> return ret;
>
> panfrost_devfreq_reset(pfdev);
>

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