drm/radeon/kms/atom/pm: rework power mode parsing

On pre-r6xx, the power mode array is usually ordered:
low
...
high
default

On r6xx+:
default
low
...
high

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 19 insertions, 4 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 031a96ceb0f5..aa0a973a8af2 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1506,6 +1506,7 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
                         num_modes = power_info->info.ucNumOfPowerModeEntries;
                         if (num_modes > ATOM_MAX_NUMBEROF_POWER_BLOCK)
                                 num_modes = ATOM_MAX_NUMBEROF_POWER_BLOCK;
+                        /* last mode is usually default, array is low to high */
                         for (i = 0; i < num_modes; i++) {
                                 rdev->pm.power_state[state_index].clock_info[0].voltage.type = VOLTAGE_NONE;
                                 switch (frev) {
@@ -1711,6 +1712,14 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
                                         break;
                                 }
                         }
+                        /* last mode is usually default */
+                        if (!rdev->pm.default_power_state) {
+                                rdev->pm.power_state[state_index - 1].type =
+                                        POWER_STATE_TYPE_DEFAULT;
+                                rdev->pm.default_power_state = &rdev->pm.power_state[state_index - 1];
+                                rdev->pm.power_state[state_index - 1].default_clock_mode =
+                                        &rdev->pm.power_state[state_index - 1].clock_info[0];
+                        }
                 } else {
                         /* add the i2c bus for thermal/fan chip */
                         /* no support for internal controller yet */
@@ -1736,6 +1745,7 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
                                         rdev->pm.i2c_bus = radeon_i2c_create(rdev->ddev, &i2c_bus, "Thermal");
                                 }
                         }
+                        /* first mode is usually default, followed by low to high */
                         for (i = 0; i < power_info->info_4.ucNumStates; i++) {
                                 mode_index = 0;
                                 power_state = (struct _ATOM_PPLIB_STATE *)
@@ -1865,12 +1875,16 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
                                         state_index++;
                                 }
                         }
+                        /* first mode is usually default */
+                        if (!rdev->pm.default_power_state) {
+                                rdev->pm.power_state[0].type =
+                                        POWER_STATE_TYPE_DEFAULT;
+                                rdev->pm.default_power_state = &rdev->pm.power_state[0];
+                                rdev->pm.power_state[0].default_clock_mode =
+                                        &rdev->pm.power_state[0].clock_info[0];
+                        }
                 }
         } else {
-                /* XXX figure out some good default low power mode for cards w/out power tables */
-        }
-
-        if (rdev->pm.default_power_state == NULL) {
                 /* add the default mode */
                 rdev->pm.power_state[state_index].type =
                         POWER_STATE_TYPE_DEFAULT;
@@ -1887,6 +1901,7 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
                 rdev->pm.default_power_state = &rdev->pm.power_state[state_index];
                 state_index++;
         }
+
         rdev->pm.num_power_states = state_index;
 
         rdev->pm.current_power_state = rdev->pm.default_power_state;