linux-kernel - [PATCH v2] drm/panthor: attach the driver's multiple power domains

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Message-Id: <20251013093438.125243-1-jiyu.yang@oss.nxp.com>
Date: Mon, 13 Oct 2025 17:34:38 +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 v2] 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>
Signed-off-by: Prabhu Sundararaj <prabhu.sundararaj@....com>
Signed-off-by: Rain Yang <jiyu.yang@....com>
---
 drivers/gpu/drm/panthor/panthor_device.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/panthor/panthor_device.c
index f0b2da5b2b96..fbbc84e9efbe 100644
--- a/drivers/gpu/drm/panthor/panthor_device.c
+++ b/drivers/gpu/drm/panthor/panthor_device.c
@@ -167,6 +167,7 @@ static void panthor_device_free_page(struct drm_device *ddev, void *data)
 int panthor_device_init(struct panthor_device *ptdev)
 {
 	u32 *dummy_page_virt;
+	struct dev_pm_domain_list  *pd_list = NULL;
 	struct resource *res;
 	struct page *p;
 	int ret;
@@ -218,6 +219,12 @@ int panthor_device_init(struct panthor_device *ptdev)
 	if (ret)
 		return ret;
 
+	ret = devm_pm_domain_attach_list(ptdev->base.dev, NULL, &pd_list);
+	if (ret < 0) {
+		drm_err(&ptdev->base, "attach power domains failed, ret=%d", ret);
+		return ret;
+	}
+
 	ret = panthor_devfreq_init(ptdev);
 	if (ret)
 		return ret;
-- 
2.39.5