A follow-up patch will add an alternative way to reduce the link parameters in BW order on MST links, prepare for that here.
Signed-off-by: Imre Deak <[email protected]> --- .../drm/i915/display/intel_dp_link_training.c | 39 +++++++++++++++---- 1 file changed, 31 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c index 58dea87a9fa28..57536ae200b77 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -1193,6 +1193,36 @@ static int reduce_lane_count(struct intel_dp *intel_dp, int current_lane_count) return current_lane_count >> 1; } +static bool reduce_link_params_in_rate_lane_order(struct intel_dp *intel_dp, + const struct intel_crtc_state *crtc_state, + int *new_link_rate, int *new_lane_count) +{ + int link_rate; + int lane_count; + + lane_count = crtc_state->lane_count; + link_rate = reduce_link_rate(intel_dp, crtc_state->port_clock); + if (link_rate < 0) { + lane_count = reduce_lane_count(intel_dp, crtc_state->lane_count); + link_rate = intel_dp_max_common_rate(intel_dp); + } + + if (lane_count < 0) + return false; + + *new_link_rate = link_rate; + *new_lane_count = lane_count; + + return true; +} + +static bool reduce_link_params(struct intel_dp *intel_dp, const struct intel_crtc_state *crtc_state, + int *new_link_rate, int *new_lane_count) +{ + return reduce_link_params_in_rate_lane_order(intel_dp, crtc_state, + new_link_rate, new_lane_count); +} + static int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, const struct intel_crtc_state *crtc_state) { @@ -1206,14 +1236,7 @@ static int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, return 0; } - new_lane_count = crtc_state->lane_count; - new_link_rate = reduce_link_rate(intel_dp, crtc_state->port_clock); - if (new_link_rate < 0) { - new_lane_count = reduce_lane_count(intel_dp, crtc_state->lane_count); - new_link_rate = intel_dp_max_common_rate(intel_dp); - } - - if (new_lane_count < 0) + if (!reduce_link_params(intel_dp, crtc_state, &new_link_rate, &new_lane_count)) return -1; if (intel_dp_is_edp(intel_dp) && -- 2.44.2
