[Bug 96645] [regression 4.7] [BISECT]Low package c-states used only after forcing DPMS to off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96645

--- Comment #18 from Gabriele Mazzotta <gabriele.mzt at gmail.com> ---
I applied the attached patch to 4.10-rc8 as follows and it fixed my problem:
right after a reboot the CPU can enter pc7 and intel_watermak reports the same
values it did with the unpatched kernel after toggling DPSM.

diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 891c86aef99d..0b15b694baa0 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -16497,12 +16497,11 @@ int intel_modeset_init(struct drm_device *dev)
                }
        }

-       intel_update_czclk(dev_priv);
-       intel_update_cdclk(dev_priv);
-       dev_priv->atomic_cdclk_freq = dev_priv->cdclk_freq;
-
        intel_shared_dpll_init(dev);

+       intel_update_czclk(dev_priv);
+       intel_modeset_init_hw(dev);
+
        if (dev_priv->max_cdclk_freq == 0)
                intel_update_max_cdclk(dev_priv);

@@ -17057,8 +17056,6 @@ void intel_modeset_gem_init(struct drm_device *dev)

        intel_init_gt_powersave(dev_priv);

-       intel_modeset_init_hw(dev);
-
        intel_setup_overlay(dev_priv);
 }

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20170217/4fca2059/attachment.html>