This is a note to let you know that I've just added the patch titled
Revert "drm/i915: try to train DP even harder"
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-drm-i915-try-to-train-dp-even-harder.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3b4f819d5eac94ba8fe5e8c061f6dabfe8d7b22c Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@xxxxxxx>
Date: Mon, 11 Mar 2013 18:40:16 +0100
Subject: Revert "drm/i915: try to train DP even harder"
From: Takashi Iwai <tiwai@xxxxxxx>
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 <tiwai@xxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 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_d
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");
Patches currently in stable-queue which might be from tiwai@xxxxxxx are
queue-3.8/revert-drm-i915-try-to-train-dp-even-harder.patch
queue-3.8/alsa-snd-usb-mixer-propagate-errors-up-the-call-chain.patch
queue-3.8/alsa-snd-usb-mixer-ignore-einval-in-snd_usb_mixer_controls.patch
queue-3.8/alsa-hda-fix-typo-in-checking-iec958-emphasis-bit.patch
queue-3.8/alsa-hda-cirrus-fix-the-digital-beep-registration.patch
queue-3.8/alsa-usb-parse-uac2-extension-unit-like-for-uac1.patch
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