kernel-6.6/0624-drm-panfrost-disable-devfreq-on-Baikal-M.patch

From 33f35785fb5dccdcda5bc4a8787fba049eb7d2d8 Mon Sep 17 00:00:00 2001
From: Alexey Sheplyakov <asheplyakov@basealt.ru>
Date: Mon, 23 May 2022 19:34:31 +0400
Subject: [PATCH 624/631] drm/panfrost: disable devfreq on Baikal-M

Enabling GPU frequency scaling on Baikal-M cases GPU MMU lockup:

  [   38.108633] panfrost 2a200000.gpu: AS_ACTIVE bit stuck

Since GPU and CPU share the memory this locks up the whole system.
Therefore disable devfreq on Baikal-M.

Signed-off-by: Alexey Sheplyakov <asheplyakov@basealt.ru>
X-DONTUPSTREAM
X-feature-Baikal-M
---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index e78de99e9933..926f8f9b4187 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -126,6 +126,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 		DRM_DEV_INFO(dev, "More than 1 supply is not supported yet\n");
 		return 0;
 	}
+	if (of_device_is_compatible(of_root, "baikal,baikal-m") ||
+			of_device_is_compatible(of_root, "baikal,bm1000")) {
+		dev_info(pfdev->dev, "disabling GPU devfreq on BE-M1000\n");
+		return 0;
+	}
 
 	ret = panfrost_read_speedbin(dev);
 	if (ret)
-- 
2.40.1