linux-kernel - [PATCH 3.16 151/306] drm/radeon/si_dpm: Limit clocks on HD86xx part

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Message-ID: <lsq.1487198500.478243224@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Tom St Denis" <tom.stdenis@....com>,
        "Alex Deucher" <alexander.deucher@....com>
Subject: [PATCH 3.16 151/306] drm/radeon/si_dpm: Limit clocks on HD86xx part

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

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

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

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: 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
@@ -3028,6 +3028,12 @@ static void si_apply_state_adjust_rules(
 		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 */