| 32,10 → 32,10 |
|---|
| * radeon_ddc_probe |
| * |
| */ |
| bool radeon_ddc_probe(struct radeon_connector *radeon_connector) |
| bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool requires_extended_probe) |
| { |
| u8 out_buf[] = { 0x0, 0x0}; |
| u8 buf[2]; |
| u8 out = 0x0; |
| u8 buf[8]; |
| int ret; |
| struct i2c_msg msgs[] = { |
| { |
| 42,7 → 42,7 |
|---|
| .addr = 0x50, |
| .flags = 0, |
| .len = 1, |
| .buf = out_buf, |
| .buf = &out, |
| }, |
| { |
| .addr = 0x50, |
| 52,16 → 52,32 |
|---|
| } |
| }; |
| |
| /* Read 8 bytes from i2c for extended probe of EDID header */ |
| if (requires_extended_probe) |
| msgs[1].len = 8; |
| |
| /* on hw with routers, select right port */ |
| if (radeon_connector->router.ddc_valid) |
| radeon_router_select_ddc_port(radeon_connector); |
| |
| ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2); |
| if (ret == 2) |
| return true; |
| |
| if (ret != 2) |
| /* Couldn't find an accessible DDC on this connector */ |
| return false; |
| if (requires_extended_probe) { |
| /* Probe also for valid EDID header |
| * EDID header starts with: |
| * 0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00. |
| * Only the first 6 bytes must be valid as |
| * drm_edid_block_valid() can fix the last 2 bytes */ |
| if (drm_edid_header_is_valid(buf) < 6) { |
| /* Couldn't find an accessible EDID on this |
| * connector */ |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /* bit banging i2c */ |
| |