drm/amdgpu: Process any VBIOS RAS EEPROM address

We can now process any RAS EEPROM address from
VBIOS. Generalize so as to compute the top three
bits of the 19-bit EEPROM address, from any byte
returned as the "i2c address" from VBIOS.

Cc: John Clements <john.clements@amd.com>
Cc: Hawking Zhang <Hawking.Zhang@amd.com>
Cc: Alex Deucher <Alexander.Deucher@amd.com>
Signed-off-by: Luben Tuikov <luben.tuikov@amd.com>
Reviewed-by: Alex Deucher <Alexander.Deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
index 1945902..dc44c94 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
@@ -114,21 +114,22 @@ static bool __get_eeprom_i2c_addr_arct(struct amdgpu_device *adev,
 static bool __get_eeprom_i2c_addr(struct amdgpu_device *adev,
                                  struct amdgpu_ras_eeprom_control *control)
 {
+       u8 i2c_addr;
+
        if (!control)
                return false;
 
-       control->i2c_address = 0;
-
-       if (amdgpu_atomfirmware_ras_rom_addr(adev, (uint8_t*)&control->i2c_address))
-       {
-               if (control->i2c_address == 0xA0)
-                       control->i2c_address = 0;
-               else if (control->i2c_address == 0xA8)
-                       control->i2c_address = 0x40000;
-               else {
-                       dev_warn(adev->dev, "RAS EEPROM I2C address not supported");
-                       return false;
-               }
+       if (amdgpu_atomfirmware_ras_rom_addr(adev, &i2c_addr)) {
+               /* The address given by VBIOS is an 8-bit, wire-format
+                * address, i.e. the most significant byte.
+                *
+                * Normalize it to a 19-bit EEPROM address. Remove the
+                * device type identifier and make it a 7-bit address;
+                * then make it a 19-bit EEPROM address. See top of
+                * amdgpu_eeprom.c.
+                */
+               i2c_addr = (i2c_addr & 0x0F) >> 1;
+               control->i2c_address = ((u32) i2c_addr) << 16;
 
                return true;
        }