linux-kernel - [PATCH 3.12 43/84] drm/radeon/si/dpm: add workaround for for Jet parts

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Message-Id: <88aef089920e0c1ab7c49aeb1539d4119b5219dc.1476690493.git.jslaby@suse.cz>
Date:   Mon, 17 Oct 2016 09:51:30 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Alex Deucher <alexander.deucher@....com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 43/84] drm/radeon/si/dpm: add workaround for for Jet parts

From: Alex Deucher <alexander.deucher@....com>

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

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

commit 670bb4fd21c966d0d2a59ad4a99bb4889f9a2987 upstream.

Add clock quirks for Jet parts.

Reviewed-by: Sonny Jiang <sonny.jiang@....com>
Tested-by: Sonny Jiang <sonny.jiang@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-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 393217886d98..db9c7d26ed16 100644
--- a/drivers/gpu/drm/radeon/si_dpm.c
+++ b/drivers/gpu/drm/radeon/si_dpm.c
@@ -3012,6 +3012,12 @@ static void si_apply_state_adjust_rules(struct radeon_device *rdev,
 	if (rdev->pdev->device == 0x6811 &&
 	    rdev->pdev->revision == 0x81)
 		max_mclk = 120000;
+	/* limit sclk/mclk on Jet parts for stability */
+	if (rdev->pdev->device == 0x6665 &&
+	    rdev->pdev->revision == 0xc3) {
+		max_sclk = 75000;
+		max_mclk = 80000;
+	}
 
 	/* XXX validate the min clocks required for display */
 
-- 
2.10.1