linux-kernel - [PATCH v3] drm/panthor: attach the driver's multiple power domains

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Message-Id: <20251022092604.181752-1-jiyu.yang@oss.nxp.com>
Date: Wed, 22 Oct 2025 17:26:04 +0800
From: Rain Yang <jiyu.yang@....nxp.com>
To: imx@...ts.linux.dev,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: boris.brezillon@...labora.com,
	steven.price@....com,
	liviu.dudau@....com,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	xianzhong.li@....com,
	Rain Yang <jiyu.yang@....com>,
	Prabhu Sundararaj <prabhu.sundararaj@....com>
Subject: [PATCH v3] drm/panthor: attach the driver's multiple power domains

From: Rain Yang <jiyu.yang@....com>

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@...labora.com>
Suggested-by: Steven Price <steven.price@....com>
Signed-off-by: Prabhu Sundararaj <prabhu.sundararaj@....com>
Signed-off-by: Rain Yang <jiyu.yang@....com>
---
 drivers/gpu/drm/panthor/panthor_device.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/panthor/panthor_device.c
index f0b2da5b2b96..c39b9812eaa7 100644
--- a/drivers/gpu/drm/panthor/panthor_device.c
+++ b/drivers/gpu/drm/panthor/panthor_device.c
@@ -64,6 +64,16 @@ 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
@@ -218,6 +228,12 @@ 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;
-- 
2.39.5