This is a note to let you know that I've just added the patch titled
drm/i915: fix display power sw state reporting
to the 3.15-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-display-power-sw-state-reporting.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b8c000d9bf23e7c1155ef421f595d1cbc25262da Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@xxxxxxxxx>
Date: Mon, 2 Jun 2014 14:21:10 +0300
Subject: drm/i915: fix display power sw state reporting
From: Imre Deak <imre.deak@xxxxxxxxx>
commit b8c000d9bf23e7c1155ef421f595d1cbc25262da upstream.
Atm, we refcount both power domains and power wells and
intel_display_power_enabled_sw() returns the power domain refcount. What
the callers are really interested in though is the sw state of the
underlying power wells. Due to this we will report incorrectly that a
given power domain is off if its power wells were enabled via another
power domain, for example POWER_DOMAIN_INIT which enables all power
wells.
As a fix return instead the state based on the refcount of all power
wells included in the passed in power domain.
References: https://bugs.freedesktop.org/show_bug.cgi?id=79505
References: https://bugs.freedesktop.org/show_bug.cgi?id=79038
Reported-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5313,10 +5313,25 @@ bool intel_display_power_enabled_sw(stru
enum intel_display_power_domain domain)
{
struct i915_power_domains *power_domains;
+ struct i915_power_well *power_well;
+ bool is_enabled;
+ int i;
+
+ if (dev_priv->pm.suspended)
+ return false;
power_domains = &dev_priv->power_domains;
+ is_enabled = true;
+ for_each_power_well_rev(i, power_well, BIT(domain), power_domains) {
+ if (power_well->always_on)
+ continue;
- return power_domains->domain_use_count[domain];
+ if (!power_well->count) {
+ is_enabled = false;
+ break;
+ }
+ }
+ return is_enabled;
}
bool intel_display_power_enabled(struct drm_i915_private *dev_priv,
Patches currently in stable-queue which might be from imre.deak@xxxxxxxxx are
queue-3.15/drm-i915-fix-display-power-sw-state-reporting.patch
queue-3.15/drm-i915-default-to-having-backlight-if-vbt-not-available.patch
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