drm/panthor: attach the driver's multiple power domains

Some platforms, such as i.MX95, utilize multiple power domains that need
to be attached explicitly. This patch ensures that the driver properly
attaches all available power domains using devm_pm_domain_attach_list().

Suggested-by: Boris Brezillon <boris.brezillon@collabora.com>
Suggested-by: Steven Price <steven.price@arm.com>
Signed-off-by: Prabhu Sundararaj <prabhu.sundararaj@nxp.com>
Signed-off-by: Rain Yang <jiyu.yang@nxp.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patch.msgid.link/20251022092604.181752-1-jiyu.yang@oss.nxp.com
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/panthor/panthor_device.c
index 83adacaa5760d6c9c5e7be09dcab0d0c92f1f019..31fb8ed68199b4ab30bdfb1f2166126a120387eb 100644 (file)
--- a/drivers/gpu/drm/panthor/panthor_device.c
+++ b/drivers/gpu/drm/panthor/panthor_device.c
@@ -66,6 +66,16 @@ static int panthor_clk_init(struct panthor_device *ptdev)
        return 0;
 }
 
+static int panthor_init_power(struct device *dev)
+{
+       struct dev_pm_domain_list  *pd_list = NULL;
+
+       if (dev->pm_domain)
+               return 0;
+
+       return devm_pm_domain_attach_list(dev, NULL, &pd_list);
+}
+
 void panthor_device_unplug(struct panthor_device *ptdev)
 {
        /* This function can be called from two different path: the reset work
@@ -222,6 +232,12 @@ int panthor_device_init(struct panthor_device *ptdev)
        if (ret)
                return ret;
 
+       ret = panthor_init_power(ptdev->base.dev);
+       if (ret < 0) {
+               drm_err(&ptdev->base, "init power domains failed, ret=%d", ret);
+               return ret;
+       }
+
        ret = panthor_devfreq_init(ptdev);
        if (ret)
                return ret;