drm/amd/powerplay: OD setting fix on Vega10

This change “drm/amd/powerplay: OD setting fix on Vega10″ in Linux kernel is authored by Kenneth Feng <kenneth.feng [at] amd.com> on Fri Jan 18 18:08:19 2019 +0800.

drm/amd/powerplay: OD setting fix on Vega10

gfxclk for OD setting is limited to 1980M for non-acg
ASICs of Vega10

Signed-off-by: Kenneth Feng <kenneth.feng@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

This Linux change may have been applied to various maintained Linux releases and you can find Linux releases including commit 6d87dc9.

There are 22 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 .../amd/powerplay/hwmgr/vega10_processpptables.c   | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
index b8747a5..99d596d 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
@@ -32,6 +32,7 @@
 #include "vega10_pptable.h"
 
 #define NUM_DSPCLK_LEVELS 8
+#define VEGA10_ENGINECLOCK_HARDMAX 198000
 
 static void set_hw_cap(struct pp_hwmgr *hwmgr, bool enable,
 		enum phm_platform_caps cap)
@@ -258,7 +259,26 @@ static int init_over_drive_limits(
 		struct pp_hwmgr *hwmgr,
 		const ATOM_Vega10_POWERPLAYTABLE *powerplay_table)
 {
-	hwmgr->platform_descriptor.overdriveLimit.engineClock =
+	const ATOM_Vega10_GFXCLK_Dependency_Table *gfxclk_dep_table =
+			(const ATOM_Vega10_GFXCLK_Dependency_Table *)
+			(((unsigned long) powerplay_table) +
+			le16_to_cpu(powerplay_table->usGfxclkDependencyTableOffset));
+	bool is_acg_enabled = false;
+	ATOM_Vega10_GFXCLK_Dependency_Record_V2 *patom_record_v2;
+
+	if (gfxclk_dep_table->ucRevId == 1) {
+		patom_record_v2 =
+			(ATOM_Vega10_GFXCLK_Dependency_Record_V2 *)gfxclk_dep_table->entries;
+		is_acg_enabled =
+			(bool)patom_record_v2[gfxclk_dep_table->ucNumEntries-1].ucACGEnable;
+	}
+
+	if (powerplay_table->ulMaxODEngineClock > VEGA10_ENGINECLOCK_HARDMAX &&
+		!is_acg_enabled)
+		hwmgr->platform_descriptor.overdriveLimit.engineClock =
+			VEGA10_ENGINECLOCK_HARDMAX;
+	else
+		hwmgr->platform_descriptor.overdriveLimit.engineClock =
 			le32_to_cpu(powerplay_table->ulMaxODEngineClock);
 	hwmgr->platform_descriptor.overdriveLimit.memoryClock =
 			le32_to_cpu(powerplay_table->ulMaxODMemoryClock);

The commit for this change in Linux stable tree is 6d87dc9 (patch).

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