drm/amdgpu: validate bad page threshold in ras(v3)

Bad page threshold value should be valid in the range between
-1 and max records length of eeprom. It could determine when
saved bad pages exceed threshold value, and proceed corresponding
actions.

v2: When using the default typical value, it should be min
value between typical value and eeprom max records length.

v3: drop the case of setting bad_page_cnt_threshold to be
    0xFFFFFFFF, as it confuses user.

Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c

@@ -499,6 +499,11 @@ free_buff:
 	return ret == num ? 0 : -EIO;
 }
 
+inline uint32_t amdgpu_ras_eeprom_get_record_max_length(void)
+{
+	return EEPROM_MAX_RECORD_NUM;
+}
+
 /* Used for testing if bugs encountered */
 #if 0
 void amdgpu_ras_eeprom_test(struct amdgpu_ras_eeprom_control *control)