linux-kernel - [PATCH 3.12 038/127] drm/radeon/si_dpm: Limit clocks on HD86xx part

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Message-Id: <396e52fe57f7ed0b66bee58a5e25e41ade342b03.1480062521.git.jslaby@suse.cz>
Date:   Fri, 25 Nov 2016 09:29:11 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Tom St Denis <tom.stdenis@....com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 038/127] drm/radeon/si_dpm: Limit clocks on HD86xx part

From: Tom St Denis <tom.stdenis@....com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit fb9a5b0c1c9893db2e0d18544fd49e19d784a87d upstream.

Limit clocks on a specific HD86xx part to avoid
crashes (while awaiting an appropriate PP fix).

Signed-off-by: Tom St Denis <tom.stdenis@....com>
Reviewed-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/gpu/drm/radeon/si_dpm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/radeon/si_dpm.c b/drivers/gpu/drm/radeon/si_dpm.c
index c1281fc39040..c75e14fdcf54 100644
--- a/drivers/gpu/drm/radeon/si_dpm.c
+++ b/drivers/gpu/drm/radeon/si_dpm.c
@@ -3018,6 +3018,12 @@ static void si_apply_state_adjust_rules(struct radeon_device *rdev,
 		max_sclk = 75000;
 		max_mclk = 80000;
 	}
+	/* limit clocks on HD8600 series */
+	if (rdev->pdev->device == 0x6660 &&
+	    rdev->pdev->revision == 0x83) {
+		max_sclk = 75000;
+		max_mclk = 80000;
+	}
 
 	/* XXX validate the min clocks required for display */
 
-- 
2.10.2