[Bug 98564] [drm:skl_set_power_well] *ERROR* power well 2 disable timeout

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98564

--- Comment #2 from Imre Deak <imre.deak at intel.com> ---
We seem to clear all request bits so not sure what keeps PW#2 up. Is there any
KVM related option in your BIOS setup, could you try with disabling it if so?

Also could you give a try to the following to increase the timeout and get some
debug info?:

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c
b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 0599408..9c7b841 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -764,9 +764,15 @@ static void skl_set_power_well(struct drm_i915_private
*dev_priv,
        }

        if (wait_for(!!(I915_READ(HSW_PWR_WELL_DRIVER) & state_mask) == enable,
-                    1))
-               DRM_ERROR("%s %s timeout\n",
-                         power_well->name, enable ? "enable" : "disable");
+                    10))
+               DRM_ERROR("%s %s timeout (%08x %08x %08x %08x %08x %08x)\n",
+                         power_well->name, enable ? "enable" : "disable",
+                         I915_READ(HSW_PWR_WELL_BIOS),
+                         I915_READ(HSW_PWR_WELL_DRIVER),
+                         I915_READ(HSW_PWR_WELL_KVMR),
+                         I915_READ(HSW_PWR_WELL_DEBUG),
+                         I915_READ(HSW_PWR_WELL_CTL5),
+                         I915_READ(HSW_PWR_WELL_CTL6));

        if (check_fuse_status) {
                if (power_well->id == SKL_DISP_PW_1) {

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