drm/radeon/atom: add new voltage fetch function for hawaii

Some hawaii boards use a different method for fetching the
voltage information from the vbios.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

2 files changed, 38 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 29731584b6ae..b3f0f0d92087 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -304,6 +304,9 @@ int radeon_atom_get_leakage_vddc_based_on_leakage_params(struct radeon_device *r
                                                          u16 *vddc, u16 *vddci,
                                                          u16 virtual_voltage_id,
                                                          u16 vbios_voltage_id);
+int radeon_atom_get_voltage_evv(struct radeon_device *rdev,
+                                u16 virtual_voltage_id,
+                                u16 *voltage);
 int radeon_atom_round_to_true_voltage(struct radeon_device *rdev,
                                       u8 voltage_type,
                                       u16 nominal_voltage,
diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 2bbf016025dc..92b2d8dd4735 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -3236,6 +3236,41 @@ int radeon_atom_get_leakage_vddc_based_on_leakage_params(struct radeon_device *r
         return 0;
 }
 
+union get_voltage_info {
+        struct  _GET_VOLTAGE_INFO_INPUT_PARAMETER_V1_2 in;
+        struct  _GET_EVV_VOLTAGE_INFO_OUTPUT_PARAMETER_V1_2 evv_out;
+};
+
+int radeon_atom_get_voltage_evv(struct radeon_device *rdev,
+                                u16 virtual_voltage_id,
+                                u16 *voltage)
+{
+        int index = GetIndexIntoMasterTable(COMMAND, GetVoltageInfo);
+        u32 entry_id;
+        u32 count = rdev->pm.dpm.dyn_state.vddc_dependency_on_sclk.count;
+        union get_voltage_info args;
+
+        for (entry_id = 0; entry_id < count; entry_id++) {
+                if (rdev->pm.dpm.dyn_state.vddc_dependency_on_sclk.entries[entry_id].v ==
+                    virtual_voltage_id)
+                        break;
+        }
+
+        if (entry_id >= count)
+                return -EINVAL;
+
+        args.in.ucVoltageType = VOLTAGE_TYPE_VDDC;
+        args.in.ucVoltageMode = ATOM_GET_VOLTAGE_EVV_VOLTAGE;
+        args.in.ulSCLKFreq =
+                cpu_to_le32(rdev->pm.dpm.dyn_state.vddc_dependency_on_sclk.entries[entry_id].clk);
+
+        atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+
+        *voltage = le16_to_cpu(args.evv_out.usVoltageLevel);
+
+        return 0;
+}
+
 int radeon_atom_get_voltage_gpio_settings(struct radeon_device *rdev,
                                           u16 voltage_level, u8 voltage_type,
                                           u32 *gpio_value, u32 *gpio_mask)