drm/radeon/kms: expose thermal/fan i2c buses

Look up i2c bus in the power table and expose it.
You'll need to load a hwmon driver for any chips
on the bus, this patch just exposes the bus.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index e4540b2b859c..815116e38aa3 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1461,6 +1461,30 @@ radeon_atombios_get_tv_dac_info(struct radeon_encoder *encoder)
         return tv_dac;
 }
 
+static const char *thermal_controller_names[] = {
+        "NONE",
+        "LM63",
+        "ADM1032",
+        "ADM1030",
+        "MUA6649",
+        "LM64",
+        "F75375",
+        "ASC7512",
+};
+
+static const char *pp_lib_thermal_controller_names[] = {
+        "NONE",
+        "LM63",
+        "ADM1032",
+        "ADM1030",
+        "MUA6649",
+        "LM64",
+        "F75375",
+        "RV6xx",
+        "RV770",
+        "ADT7473",
+};
+
 union power_info {
         struct _ATOM_POWERPLAY_INFO info;
         struct _ATOM_POWERPLAY_INFO_V2 info_2;
@@ -1480,6 +1504,7 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
         struct _ATOM_PPLIB_STATE *power_state;
         int num_modes = 0, i, j;
         int state_index = 0, mode_index = 0;
+        struct radeon_i2c_bus_rec i2c_bus;
 
         atom_parse_data_header(mode_info->atom_context, index, NULL, &frev, &crev, &data_offset);
 
@@ -1489,6 +1514,14 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
 
         if (power_info) {
                 if (frev < 4) {
+                        /* add the i2c bus for thermal/fan chip */
+                        if (power_info->info.ucOverdriveThermalController > 0) {
+                                DRM_INFO("Possible %s thermal controller at 0x%02x\n",
+                                         thermal_controller_names[power_info->info.ucOverdriveThermalController],
+                                         power_info->info.ucOverdriveControllerAddress >> 1);
+                                i2c_bus = radeon_lookup_i2c_gpio(rdev, power_info->info.ucOverdriveI2cLine);
+                                rdev->pm.i2c_bus = radeon_i2c_create(rdev->ddev, &i2c_bus, "Thermal");
+                        }
                         num_modes = power_info->info.ucNumOfPowerModeEntries;
                         if (num_modes > ATOM_MAX_NUMBEROF_POWER_BLOCK)
                                 num_modes = ATOM_MAX_NUMBEROF_POWER_BLOCK;
@@ -1698,6 +1731,24 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
                                 }
                         }
                 } else if (frev == 4) {
+                        /* add the i2c bus for thermal/fan chip */
+                        /* no support for internal controller yet */
+                        if (power_info->info_4.sThermalController.ucType > 0) {
+                                if ((power_info->info_4.sThermalController.ucType == ATOM_PP_THERMALCONTROLLER_RV6xx) &&
+                                    (power_info->info_4.sThermalController.ucType == ATOM_PP_THERMALCONTROLLER_RV770)) {
+                                        DRM_INFO("Internal thermal controller %s fan control\n",
+                                                 (power_info->info_4.sThermalController.ucFanParameters &
+                                                  ATOM_PP_FANPARAMETERS_NOFAN) ? "without" : "with");
+                                } else {
+                                        DRM_INFO("Possible %s thermal controller at 0x%02x %s fan control\n",
+                                                 pp_lib_thermal_controller_names[power_info->info_4.sThermalController.ucType],
+                                                 power_info->info_4.sThermalController.ucI2cAddress >> 1,
+                                                 (power_info->info_4.sThermalController.ucFanParameters &
+                                                  ATOM_PP_FANPARAMETERS_NOFAN) ? "without" : "with");
+                                        i2c_bus = radeon_lookup_i2c_gpio(rdev, power_info->info_4.sThermalController.ucI2cLine);
+                                        rdev->pm.i2c_bus = radeon_i2c_create(rdev->ddev, &i2c_bus, "Thermal");
+                                }
+                        }
                         for (i = 0; i < power_info->info_4.ucNumStates; i++) {
                                 mode_index = 0;
                                 power_state = (struct _ATOM_PPLIB_STATE *)