This is a note to let you know that I've just added the patch titled
drm/i915: Fix PSR programming
to the 3.13-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-fix-psr-programming.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 24bd9bf54d45d28089251cdf62bf14323d1aa827 Mon Sep 17 00:00:00 2001
From: Ben Widawsky <benjamin.widawsky@xxxxxxxxx>
Date: Tue, 4 Mar 2014 22:38:10 -0800
Subject: drm/i915: Fix PSR programming
From: Ben Widawsky <benjamin.widawsky@xxxxxxxxx>
commit 24bd9bf54d45d28089251cdf62bf14323d1aa827 upstream.
| has a higher precedence than ?. Therefore, the calculation doesn't do
at all what you would expect. Thanks to Ken for convincing me that this
was indeed the issue. Send me back to C programmer school, please.
I'm sort of surprised PSR was continuing to work for people. It should
be broken IMO (and it was broken for me, but I had assumed it never
worked).
Regression from:
commit ed8546ac1f99b850879f07b1e9b06b42fb0a36d9
Author: Ben Widawsky <benjamin.widawsky@xxxxxxxxx>
Date: Mon Nov 4 22:45:05 2013 -0800
drm/i915/bdw: Support eDP PSR
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Kenneth Graunke <kenneth.w.graunke@xxxxxxxxx>
Cc: Art Runyan <arthur.j.runyan@xxxxxxxxx>
Reported-by: "Kumar, Kiran S" <kiran.s.kumar@xxxxxxxxx>
Signed-off-by: Ben Widawsky <ben@xxxxxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
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
@@ -1634,7 +1634,7 @@ static void intel_edp_psr_enable_source(
val |= EDP_PSR_LINK_DISABLE;
I915_WRITE(EDP_PSR_CTL(dev), val |
- IS_BROADWELL(dev) ? 0 : link_entry_time |
+ (IS_BROADWELL(dev) ? 0 : link_entry_time) |
max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT |
idle_frames << EDP_PSR_IDLE_FRAME_SHIFT |
EDP_PSR_ENABLE);
Patches currently in stable-queue which might be from benjamin.widawsky@xxxxxxxxx are
queue-3.13/drm-i915-fix-psr-programming.patch
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