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From 670aed8119f293b41b82195cf96fa78c86cc3d49 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 2/2] 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>
Signed-off-by: Fredrik Schön <fredrik.schon@gmail.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
---
drivers/gpu/drm/i915/intel_lspcon.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
index 8ae8f42f430a..6b6758419fb3 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");
--
2.18.0
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