This is a note to let you know that I've just added the patch titled
drm/i915: Restore lost DPLL register write on gen2-4
to the 3.10-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:
drm-i915-restore-lost-dpll-register-write-on-gen2-4.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8e7a65aa70bcc1235a44e40ae0da5056525fe081 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Wed, 7 Oct 2015 22:08:24 +0300
Subject: drm/i915: Restore lost DPLL register write on gen2-4
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From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
commit 8e7a65aa70bcc1235a44e40ae0da5056525fe081 upstream.
We accidentally lost the initial DPLL register write in
1c4e02746147 drm/i915: Fix DVO 2x clock enable on 830M
The "three times for luck" hack probably saved us from a total
disaster. But anyway, bring the initial write back so that the
code actually makes some sense.
Reported-and-tested-by: Nick Bowler <nbowler@xxxxxxxxxx>
References: http://mid.gmane.org/CAN_QmVyMaArxYgEcVVsGvsMo7-6ohZr8HmF5VhkkL4i9KOmrhw@xxxxxxxxxxxxxx
Cc: Nick Bowler <nbowler@xxxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4293,6 +4293,8 @@ static void vlv_update_pll(struct intel_
I915_WRITE(DPLL(pipe), dpll);
+ I915_WRITE(reg, dpll);
+
/* Wait for the clocks to stabilize. */
POSTING_READ(DPLL(pipe));
udelay(150);
Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are
queue-3.10/drm-i915-restore-lost-dpll-register-write-on-gen2-4.patch
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