Unnamed repository; edit this file 'description' to name the repository. https://git.kobert.dev/pm24.git/atom/drivers/gpu/drm/amd/display/dc/inc/link_dpcd.h?h=v5.16 2021-07-23T14:07:57Z 2021-07-23T14:07:57Z Wesley Chalmers Wesley.Chalmers@amd.com 2021-06-30T14:42:23Z urn:sha1:d93d5356369701eced20053382d2d094d8b522ac Reviewed-by: Shahin Khayyer <Shahin.Khayyer@amd.com> Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 2021-06-15T21:25:41Z Wesley Chalmers Wesley.Chalmers@amd.com 2021-04-01T16:23:06Z urn:sha1:30adeee52d1ebadd8e4e594a54c7cf77250b91db [WHY] Some DPCD addresses, notably LTTPR Capability registers, are expected to be read all together in a single DPCD transaction. Rather than force callers to read registers they don't need, we want to quietly extend the addresses read, and only return back the values the caller asked for. This does not affect DPCD writes. [HOW] Create an additional layer above AUX to perform 'checked' DPCD transactions. Iterate through an array of DPCD address ranges that are marked as being contiguous. If a requested read falls within one of those ranges, extend the read to include the entire range. After DPCD has been queried, copy the requested bytes into the caller's data buffer, and deallocate all resources used. Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com> Reviewed-by: Jun Lei <Jun.Lei@amd.com> Acked-by: Anson Jacob <Anson.Jacob@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>