From e3ab894ba1df93b0b9c0daf15b31a0ba0c9b5957 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Mon, 11 Mar 2013 18:40:16 +0100 Subject: [PATCH] Revert "drm/i915: try to train DP even harder" commit 3b4f819d5eac94ba8fe5e8c061f6dabfe8d7b22c upstream. This reverts commit 0d71068835e2610576d369d6d4cbf90e0f802a71. Not only that the commit introduces a bogus check (voltage_tries == 5 will never meet at the inserted code path), it brings the i915 driver into an endless dp-train loop on HP Z1 desktop machine with IVY+eDP. At least reverting this commit recovers the framebuffer (but X is still broken by other reasons...) Signed-off-by: Takashi Iwai Signed-off-by: Daniel Vetter Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/intel_dp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index fb3715b4b09d2..2e1c10a73ecd9 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1850,7 +1850,7 @@ intel_dp_start_link_train(struct intel_dp *intel_dp) for (i = 0; i < intel_dp->lane_count; i++) if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0) break; - if (i == intel_dp->lane_count && voltage_tries == 5) { + if (i == intel_dp->lane_count) { ++loop_tries; if (loop_tries == 5) { DRM_DEBUG_KMS("too many full retries, give up\n"); -- 2.50.1