diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_bios.h')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_bios.h | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h index 6e9250eb9c2..1da2bf20829 100644 --- a/drivers/gpu/drm/i915/intel_bios.h +++ b/drivers/gpu/drm/i915/intel_bios.h @@ -202,7 +202,10 @@ struct bdb_general_features { #define DEVICE_PORT_DVOB 0x01 #define DEVICE_PORT_DVOC 0x02 -struct child_device_config { +/* We used to keep this struct but without any version control. We should avoid + * using it in the future, but it should be safe to keep using it in the old + * code. */ +struct old_child_dev_config { u16 handle; u16 device_type; u8 device_id[10]; /* ascii string */ @@ -224,6 +227,32 @@ struct child_device_config { u8 dvo_function; } __attribute__((packed)); +/* This one contains field offsets that are known to be common for all BDB + * versions. Notice that the meaning of the contents contents may still change, + * but at least the offsets are consistent. */ +struct common_child_dev_config { + u16 handle; + u16 device_type; + u8 not_common1[12]; + u8 dvo_port; + u8 not_common2[2]; + u8 ddc_pin; + u16 edid_ptr; +} __attribute__((packed)); + +/* This field changes depending on the BDB version, so the most reliable way to + * read it is by checking the BDB version and reading the raw pointer. */ +union child_device_config { + /* This one is safe to be used anywhere, but the code should still check + * the BDB version. */ + u8 raw[33]; + /* This one should only be kept for legacy code. */ + struct old_child_dev_config old; + /* This one should also be safe to use anywhere, even without version + * checks. */ + struct common_child_dev_config common; +}; + struct bdb_general_definitions { /* DDC GPIO */ u8 crt_ddc_gmbus_pin; @@ -249,7 +278,7 @@ struct bdb_general_definitions { * number = (block_size - sizeof(bdb_general_definitions))/ * sizeof(child_device_config); */ - struct child_device_config devices[0]; + union child_device_config devices[0]; } __attribute__((packed)); struct bdb_lvds_options { |