From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
If LCPLL is disabled, there's a chance we might be in package C8 state
or deeper, and we'll get a hard hang when restoring LCPLL (also, a red
led lights up on my motherboard). So grab the force_wake, which will
get us out of RC6 and, as a consequence, out of PC8+ (since we need
RC6 to get into PC8+).
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 00114a5..8c63d8e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6031,6 +6031,10 @@ void hsw_restore_lcpll(struct drm_i915_private *dev_priv)
LCPLL_POWER_DOWN_ALLOW)) == LCPLL_PLL_LOCK)
return;
+ /* Make sure we're not on PC8 state before disabling PC8, otherwise
+ * we'll hang the machine! */
+ dev_priv->uncore.funcs.force_wake_get(dev_priv);
+
if (val & LCPLL_POWER_DOWN_ALLOW) {
val &= ~LCPLL_POWER_DOWN_ALLOW;
I915_WRITE(LCPLL_CTL, val);
@@ -6058,6 +6062,8 @@ void hsw_restore_lcpll(struct drm_i915_private *dev_priv)
LCPLL_CD_SOURCE_FCLK_DONE) == 0, 1))
DRM_ERROR("Switching back to LCPLL failed\n");
}
+
+ dev_priv->uncore.funcs.force_wake_put(dev_priv);
}
static void haswell_modeset_global_resources(struct drm_device *dev)
--
1.8.1.2
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