From: Eric Yang <[email protected]> [Why] Skipping initial link training will result in no verified link cap for mode enumeration. Some versions of the BIOS seem to have PHY programming sequence issue as well if initial link training is skipped, resulting in a softlock in BIOS command table.
[How] Identify the empty dongle hotplug case, and still do initial link training. Signed-off-by: Eric Yang <[email protected]> Reviewed-by: Tony Cheng <[email protected]> Acked-by: Leo Li <[email protected]> --- drivers/gpu/drm/amd/display/dc/core/dc_link.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index 5e7e9ab..2b82ea8 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -702,12 +702,26 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason) if (memcmp(&link->dpcd_caps, &prev_dpcd_caps, sizeof(struct dpcd_caps))) same_dpcd = false; } - /* Active dongle downstream unplug */ + /* Active dongle plug in without display or downstream unplug*/ if (link->type == dc_connection_active_dongle && link->dpcd_caps.sink_count. bits.SINK_COUNT == 0) { - if (prev_sink != NULL) + if (prev_sink != NULL) { + /* Downstream unplug */ dc_sink_release(prev_sink); + } else { + /* Empty dongle plug in */ + for (i = 0; i < LINK_TRAINING_MAX_VERIFY_RETRY; i++) { + int fail_count = 0; + + dp_verify_link_cap(link, + &link->reported_link_cap, + &fail_count); + + if (fail_count == 0) + break; + } + } return true; } -- 2.7.4 _______________________________________________ amd-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/amd-gfx
