linux-kernel - [PATCH] drm/radeon: Add HAINAN clock adjustment

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Message-ID: <20260210072524.15119-1-decce6@proton.me>
Date: Tue, 10 Feb 2026 07:26:00 +0000
From: decce6 <decce6@...ton.me>
To: amd-gfx@...ts.freedesktop.org
Cc: decce6 <decce6@...ton.me>, Alex Deucher <alexander.deucher@....com>, Christian König <christian.koenig@....com>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/radeon: Add HAINAN clock adjustment

This patch limits the clock speeds of the AMD Radeon R5 M420 GPU from
850/1000MHz (core/memory) to 800/950 MHz, making it work stably. This
patch is for radeon.

Signed-off-by: decce6 <decce6@...ton.me>
---
 drivers/gpu/drm/radeon/si_dpm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/radeon/si_dpm.c b/drivers/gpu/drm/radeon/si_dpm.c
index 9deb91970d4d..f12227145ef0 100644
--- a/drivers/gpu/drm/radeon/si_dpm.c
+++ b/drivers/gpu/drm/radeon/si_dpm.c
@@ -2925,6 +2925,11 @@ static void si_apply_state_adjust_rules(struct radeon_device *rdev,
 			max_sclk = 60000;
 			max_mclk = 80000;
 		}
+		if ((rdev->pdev->device == 0x666f) &&
+		    (rdev->pdev->revision == 0x00)) {
+			max_sclk = 80000;
+			max_mclk = 95000;
+		}
 	} else if (rdev->family == CHIP_OLAND) {
 		if ((rdev->pdev->revision == 0xC7) ||
 		    (rdev->pdev->revision == 0x80) ||
-- 
2.43.0