linux-kernel - [PATCH 3.16 323/346] drm/radeon/si/dpm: add workaround for for Jet parts

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Message-ID: <lsq.1479082460.757614677@decadent.org.uk>
Date:   Mon, 14 Nov 2016 00:14:20 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Sonny Jiang" <sonny.jiang@....com>,
        "Alex Deucher" <alexander.deucher@....com>
Subject: [PATCH 3.16 323/346] drm/radeon/si/dpm: add workaround for for
 Jet parts

3.16.39-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

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: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/radeon/si_dpm.c | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/gpu/drm/radeon/si_dpm.c
+++ b/drivers/gpu/drm/radeon/si_dpm.c
@@ -3022,6 +3022,12 @@ static void si_apply_state_adjust_rules(
 	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 */