drm/radeon/kms/pm: add support for SetVoltage cmd table (V2)

- This enables voltage adjustment on r6xx+ and certain
r5xx asics.
- Voltage drop support is already available for most
r1xx-r5xx asics.

V2: endian fix for voltage table.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/r600.c

@@ -475,6 +475,12 @@ void r600_pm_init_profile(struct radeon_device *rdev)
 
 void r600_pm_misc(struct radeon_device *rdev)
 {
+	int requested_index = rdev->pm.requested_power_state_index;
+	struct radeon_power_state *ps = &rdev->pm.power_state[requested_index];
+	struct radeon_voltage *voltage = &ps->clock_info[0].voltage;
+
+	if ((voltage->type == VOLTAGE_SW) && voltage->voltage)
+		radeon_atom_set_voltage(rdev, voltage->voltage);
 
 }
 

drivers/gpu/drm/radeon/radeon.h

@@ -176,6 +176,7 @@ void radeon_pm_suspend(struct radeon_device *rdev);
 void radeon_pm_resume(struct radeon_device *rdev);
 void radeon_combios_get_power_modes(struct radeon_device *rdev);
 void radeon_atombios_get_power_modes(struct radeon_device *rdev);
+void radeon_atom_set_voltage(struct radeon_device *rdev, u16 level);
 
 /*
  * Fences.

drivers/gpu/drm/radeon/radeon_atombios.c

@@ -1998,6 +1998,42 @@ void radeon_atom_set_memory_clock(struct radeon_device *rdev,
 	atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 }
 
+union set_voltage {
+	struct _SET_VOLTAGE_PS_ALLOCATION alloc;
+	struct _SET_VOLTAGE_PARAMETERS v1;
+	struct _SET_VOLTAGE_PARAMETERS_V2 v2;
+};
+
+void radeon_atom_set_voltage(struct radeon_device *rdev, u16 level)
+{
+	union set_voltage args;
+	int index = GetIndexIntoMasterTable(COMMAND, SetVoltage);
+	u8 frev, crev, volt_index = level;
+
+	if (!atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev))
+		return;
+
+	switch (crev) {
+	case 1:
+		args.v1.ucVoltageType = SET_VOLTAGE_TYPE_ASIC_VDDC;
+		args.v1.ucVoltageMode = SET_ASIC_VOLTAGE_MODE_ALL_SOURCE;
+		args.v1.ucVoltageIndex = volt_index;
+		break;
+	case 2:
+		args.v2.ucVoltageType = SET_VOLTAGE_TYPE_ASIC_VDDC;
+		args.v2.ucVoltageMode = SET_ASIC_VOLTAGE_MODE_SET_VOLTAGE;
+		args.v2.usVoltageLevel = cpu_to_le16(level);
+		break;
+	default:
+		DRM_ERROR("Unknown table version %d, %d\n", frev, crev);
+		return;
+	}
+
+	atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+}
+
+
+
 void radeon_atom_initialize_bios_scratch_regs(struct drm_device *dev)
 {
 	struct radeon_device *rdev = dev->dev_private;

drivers/gpu/drm/radeon/rs600.c

@@ -74,7 +74,8 @@ void rs600_pm_misc(struct radeon_device *rdev)
 			if (voltage->delay)
 				udelay(voltage->delay);
 		}
-	}
+	} else if (voltage->type == VOLTAGE_VDDC)
+		radeon_atom_set_voltage(rdev, voltage->vddc_id);
 
 	dyn_pwrmgt_sclk_length = RREG32_PLL(DYN_PWRMGT_SCLK_LENGTH);
 	dyn_pwrmgt_sclk_length &= ~REDUCED_POWER_SCLK_HILEN(0xf);