drm/amd/pm: support overdrive vddgfx offset setting(V2)

This is supported by Sienna Cichlid, Navy Flounder and Dimgrey
Cavefish. For these ASICs, the target voltage calculation can be
illustrated by "voltage = voltage calculated from v/f curve +
overdrive vddgfx offset".

V2: limit the smu_version check for Sienna Cichlid only

Here are some sample usages about this new OD setting:
1. Check current vddgfx offset setting by
cat /sys/class/drm/card0/device/pp_od_clk_voltage
...
...
OD_VDDGFX_OFFSET:
0mV
...
...

2. Set new vddgfx offset by
echo "vo 10" > /sys/class/drm/card0/device/pp_od_clk_voltage
cat /sys/class/drm/card0/device/pp_od_clk_voltage
...
...
OD_VDDGFX_OFFSET:
10mV
...
...
3. Commit the new setting by
echo "c" > /sys/class/drm/card0/device/pp_od_clk_voltage

Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/include/kgd_pp_interface.h b/drivers/gpu/drm/amd/include/kgd_pp_interface.h
index f775aac6c1bd..270f8db5115a 100644
--- a/drivers/gpu/drm/amd/include/kgd_pp_interface.h
+++ b/drivers/gpu/drm/amd/include/kgd_pp_interface.h
@@ -157,7 +157,8 @@ enum PP_OD_DPM_TABLE_COMMAND {
 	PP_OD_EDIT_MCLK_VDDC_TABLE,
 	PP_OD_EDIT_VDDC_CURVE,
 	PP_OD_RESTORE_DEFAULT_TABLE,
-	PP_OD_COMMIT_DPM_TABLE
+	PP_OD_COMMIT_DPM_TABLE,
+	PP_OD_EDIT_VDDGFX_OFFSET
 };
 
 struct pp_states_info {