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e45d60a769
Analog displays typically have a DDC connection which can be used by the GPU to read EDID. This commit adds the capability to probe analog displays using DDC, reading the EDID header and deciding whether the analog link is connected based on the data that was read. Note that VGA has no HPD (hotplug detection), so we need to to do analog link detection for VGA before checking HPD. In case of DVI-I, while the connector supports HPD, not all analog cables connect the HPD pins, so we can't rely on HPD either. For reference, see the legacy display code: amdgpu_connector_vga_detect amdgpu_display_ddc_probe DAC load detection will be implemented in a separate commit. v2: Fix crash / black screen on newer GPUs during link detection. Ignore HPD pin for analog connectors. Signed-off-by: Timur Kristóf <timur.kristof@gmail.com> Reviewed-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Linux kernel
============
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