linux-kernel - [PATCH 4.8 106/138] drm/radeon/si_dpm: Limit clocks on HD86xx part

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Message-Id: <20161109102849.779135068@linuxfoundation.org>
Date:   Wed,  9 Nov 2016 11:46:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tom St Denis <tom.stdenis@....com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 4.8 106/138] drm/radeon/si_dpm: Limit clocks on HD86xx part

4.8-stable 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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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
@@ -3021,6 +3021,12 @@ 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;
+	}
 
 	if (rps->vce_active) {
 		rps->evclk = rdev->pm.dpm.vce_states[rdev->pm.dpm.vce_level].evclk;