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SubjectRe: [PATCH v2] drm/amd/display: add panel_power_savings sysfs entry to eDP connectors
From
Am 02.02.24 um 16:28 schrieb Hamza Mahfooz:
> We want programs besides the compositor to be able to enable or disable
> panel power saving features.

Well I don't know the full background, but that is usually a no-go.

> However, since they are currently only
> configurable through DRM properties, that isn't possible.

Maybe I'm repeating others, but I wanted to point it out explicitly:
This is intentional and not that easily changeable.

If it's a common DRM property, e.g. something standardized among all
drivers, then amdgpu is not allowed to circumvent that.

Regards,
Christian.

> So, to remedy
> that issue introduce a new "panel_power_savings" sysfs attribute.
>
> Cc: Mario Limonciello <mario.limonciello@amd.com>
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
> ---
> v2: hide ABM_LEVEL_IMMEDIATE_DISABLE in the read case, force an atomic
> commit when setting the value, call sysfs_remove_group() in
> amdgpu_dm_connector_unregister() and add some documentation.
> ---
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 76 +++++++++++++++++++
> 1 file changed, 76 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 8590c9f1dda6..3c62489d03dc 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -6436,10 +6436,79 @@ int amdgpu_dm_connector_atomic_get_property(struct drm_connector *connector,
> return ret;
> }
>
> +/**
> + * DOC: panel power savings
> + *
> + * The display manager allows you to set your desired **panel power savings**
> + * level (between 0-4, with 0 representing off), e.g. using the following::
> + *
> + * # echo 3 > /sys/class/drm/card0-eDP-1/amdgpu/panel_power_savings
> + *
> + * Modifying this value can have implications on color accuracy, so tread
> + * carefully.
> + */
> +
> +static ssize_t panel_power_savings_show(struct device *device,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct drm_connector *connector = dev_get_drvdata(device);
> + struct drm_device *dev = connector->dev;
> + u8 val;
> +
> + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
> + val = to_dm_connector_state(connector->state)->abm_level ==
> + ABM_LEVEL_IMMEDIATE_DISABLE ? 0 :
> + to_dm_connector_state(connector->state)->abm_level;
> + drm_modeset_unlock(&dev->mode_config.connection_mutex);
> +
> + return sysfs_emit(buf, "%u\n", val);
> +}
> +
> +static ssize_t panel_power_savings_store(struct device *device,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct drm_connector *connector = dev_get_drvdata(device);
> + struct drm_device *dev = connector->dev;
> + long val;
> + int ret;
> +
> + ret = kstrtol(buf, 0, &val);
> +
> + if (ret)
> + return ret;
> +
> + if (val < 0 || val > 4)
> + return -EINVAL;
> +
> + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
> + to_dm_connector_state(connector->state)->abm_level = val ?:
> + ABM_LEVEL_IMMEDIATE_DISABLE;
> + drm_modeset_unlock(&dev->mode_config.connection_mutex);
> +
> + drm_kms_helper_hotplug_event(dev);
> +
> + return count;
> +}
> +
> +static DEVICE_ATTR_RW(panel_power_savings);
> +
> +static struct attribute *amdgpu_attrs[] = {
> + &dev_attr_panel_power_savings.attr,
> + NULL
> +};
> +
> +static const struct attribute_group amdgpu_group = {
> + .name = "amdgpu",
> + .attrs = amdgpu_attrs
> +};
> +
> static void amdgpu_dm_connector_unregister(struct drm_connector *connector)
> {
> struct amdgpu_dm_connector *amdgpu_dm_connector = to_amdgpu_dm_connector(connector);
>
> + sysfs_remove_group(&connector->kdev->kobj, &amdgpu_group);
> drm_dp_aux_unregister(&amdgpu_dm_connector->dm_dp_aux.aux);
> }
>
> @@ -6541,6 +6610,13 @@ amdgpu_dm_connector_late_register(struct drm_connector *connector)
> to_amdgpu_dm_connector(connector);
> int r;
>
> + if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
> + r = sysfs_create_group(&connector->kdev->kobj,
> + &amdgpu_group);
> + if (r)
> + return r;
> + }
> +
> amdgpu_dm_register_backlight_device(amdgpu_dm_connector);
>
> if ((connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort) ||


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