The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 299c2a904b1e8d5096d4813df6371357d97a6cd1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fredrik=20Sch=C3=B6n?= fredrikschon@gmail.com Date: Fri, 17 Aug 2018 22:07:28 +0200 Subject: [PATCH] drm/i915: Increase LSPCON timeout MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
100 ms is not enough time for the LSPCON adapter on Intel NUC devices to settle. This causes dropped display modes at boot or screen reconfiguration. Empirical testing can reproduce the error up to a timeout of 190 ms. Basic boot and stress testing at 200 ms has not (yet) failed.
Increase timeout to 400 ms to get some margin of error.
Changes from v1: The initial suggestion of 1000 ms was lowered due to concerns about delaying valid timeout cases. Update patch metadata.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107503 Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1570392 Fixes: 357c0ae9198a ("drm/i915/lspcon: Wait for expected LSPCON mode to settle") Cc: Shashank Sharma shashank.sharma@intel.com Cc: Imre Deak imre.deak@intel.com Cc: Jani Nikula jani.nikula@intel.com Cc: stable@vger.kernel.org # v4.11+ Reviewed-by: Rodrigo Vivi rodrigo.vivi@intel.com Reviewed-by: Shashank Sharma shashank.sharma@intel.com Signed-off-by: Fredrik Schön fredrik.schon@gmail.com Signed-off-by: Jani Nikula jani.nikula@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20180817200728.8154-1-fredrik.... (cherry picked from commit 59f1c8ab30d6f9042562949f42cbd3f3cf69de94) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com
diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c index 5dae16ccd9f1..3e085c5f2b81 100644 --- a/drivers/gpu/drm/i915/intel_lspcon.c +++ b/drivers/gpu/drm/i915/intel_lspcon.c @@ -74,7 +74,7 @@ static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon, DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n", lspcon_mode_name(mode));
- wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode, 100); + wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode, 400); if (current_mode != mode) DRM_ERROR("LSPCON mode hasn't settled\n");