From: Jani Nikula Date: Thu, 28 Aug 2025 12:20:55 +0000 (+0300) Subject: drm/i915/dp: use generic poll_timeout_us() instead of wait_for() in link training X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=476721f28ee8f97abc89103c89279766167ef95a;p=users%2Fhch%2Fmisc.git drm/i915/dp: use generic poll_timeout_us() instead of wait_for() in link training Prefer generic poll helpers over i915 custom helpers. The functional change is losing the exponentially growing sleep of wait_for(), which used to be 10, 20, 40, ..., 640, and 1280 us. Use an arbitrary constant 500 us sleep instead. The timeout remains at 500 ms. Reviewed-by: Jouni Högander Link: https://lore.kernel.org/r/29ab4738758fe844dc1323c4a59d5d6bdcf87308.1756383233.git.jani.nikula@intel.com Signed-off-by: Jani Nikula --- 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 9d14b4e59545..27f3716bdc1f 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -22,6 +22,7 @@ */ #include +#include #include #include @@ -1135,15 +1136,19 @@ void intel_dp_stop_link_train(struct intel_dp *intel_dp, { struct intel_display *display = to_intel_display(intel_dp); struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base; + int ret; intel_dp->link.active = true; intel_dp_program_link_training_pattern(intel_dp, crtc_state, DP_PHY_DPRX, DP_TRAINING_PATTERN_DISABLE); - if (intel_dp_is_uhbr(crtc_state) && - wait_for(intel_dp_128b132b_intra_hop(intel_dp, crtc_state) == 0, 500)) { - lt_dbg(intel_dp, DP_PHY_DPRX, "128b/132b intra-hop not clearing\n"); + if (intel_dp_is_uhbr(crtc_state)) { + ret = poll_timeout_us(ret = intel_dp_128b132b_intra_hop(intel_dp, crtc_state), + ret == 0, + 500, 500 * 1000, false); + if (ret) + lt_dbg(intel_dp, DP_PHY_DPRX, "128b/132b intra-hop not clearing\n"); } intel_hpd_unblock(encoder); @@ -1581,8 +1586,12 @@ intel_dp_128b132b_link_train(struct intel_dp *intel_dp, int lttpr_count) { bool passed = false; + int ret; - if (wait_for(intel_dp_128b132b_intra_hop(intel_dp, crtc_state) == 0, 500)) { + ret = poll_timeout_us(ret = intel_dp_128b132b_intra_hop(intel_dp, crtc_state), + ret == 0, + 500, 500 * 1000, false); + if (ret) { lt_err(intel_dp, DP_PHY_DPRX, "128b/132b intra-hop not clear\n"); goto out; }