drm/radeon/kms: add thermal chip quirk for asus 9600xt

The board has an lm63 compatible thermal chip, but no
thermal chip entry in the vbios tables.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=39513

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 20 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index a74217cd192f..e0138b674aca 100644
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -2557,6 +2557,7 @@ void radeon_combios_get_power_modes(struct radeon_device *rdev)
         u16 offset, misc, misc2 = 0;
         u8 rev, blocks, tmp;
         int state_index = 0;
+        struct radeon_i2c_bus_rec i2c_bus;
 
         rdev->pm.default_power_state_index = -1;
 
@@ -2575,7 +2576,6 @@ void radeon_combios_get_power_modes(struct radeon_device *rdev)
         offset = combios_get_table_offset(dev, COMBIOS_OVERDRIVE_INFO_TABLE);
         if (offset) {
                 u8 thermal_controller = 0, gpio = 0, i2c_addr = 0, clk_bit = 0, data_bit = 0;
-                struct radeon_i2c_bus_rec i2c_bus;
 
                 rev = RBIOS8(offset);
 
@@ -2617,6 +2617,25 @@ void radeon_combios_get_power_modes(struct radeon_device *rdev)
                                 i2c_new_device(&rdev->pm.i2c_bus->adapter, &info);
                         }
                 }
+        } else {
+                /* boards with a thermal chip, but no overdrive table */
+
+                /* Asus 9600xt has an f75375 on the monid bus */
+                if ((dev->pdev->device == 0x4152) &&
+                    (dev->pdev->subsystem_vendor == 0x1043) &&
+                    (dev->pdev->subsystem_device == 0xc002)) {
+                        i2c_bus = combios_setup_i2c_bus(rdev, DDC_MONID, 0, 0);
+                        rdev->pm.i2c_bus = radeon_i2c_lookup(rdev, &i2c_bus);
+                        if (rdev->pm.i2c_bus) {
+                                struct i2c_board_info info = { };
+                                const char *name = "f75375";
+                                info.addr = 0x28;
+                                strlcpy(info.type, name, sizeof(info.type));
+                                i2c_new_device(&rdev->pm.i2c_bus->adapter, &info);
+                                DRM_INFO("Possible %s thermal controller at 0x%02x\n",
+                                         name, info.addr);
+                        }
+                }
         }
 
         if (rdev->flags & RADEON_IS_MOBILITY) {