linux-kernel - [PATCH] drm/radeon: Fix GPU lockups for the R7 M270

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Date:   Sat, 11 Mar 2017 21:51:13 +0530
From:   Umang Raghuvanshi <u@...ngis.me>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     Umang Raghuvanshi <u@...ngis.me>
Subject: [PATCH] drm/radeon: Fix GPU lockups for the R7 M270

Commit 3a69adfe5617 ("drm/radeon: drop oland quirks") removed
quirks for Oland but also caused a regression where M270 GPUs
would go into a lock-up when OpenGL intensive applications were used.
This reverts the change only for the M270 and fixes the lock-ups.

Signed-off-by: Umang Raghuvanshi <u@...ngis.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 d12b8978142f..c2c129eef3c4 100644
--- a/drivers/gpu/drm/radeon/si_dpm.c
+++ b/drivers/gpu/drm/radeon/si_dpm.c
@@ -2984,6 +2984,11 @@ static void si_apply_state_adjust_rules(struct radeon_device *rdev,
 		    (rdev->pdev->device == 0x6667)) {
 			max_sclk = 75000;
 		}
+	} else if (rdev->family == CHIP_OLAND && rdev->pdev->device == 0x6604 &&
+		   rdev->pdev->revision == 0) {
+		// Fix max_sclk and max_mclk for the Radeon R7 M270
+		max_sclk = 75000;
+		max_mclk = 80000;
 	}
 
 	if (rps->vce_active) {
-- 
2.12.0