[Bug 73252] [Baytrail-M] brightness can't be adjusted: no ASLE interrupt code

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73252

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
See intel_opregion_asle_intr(). However, the asle interrupt is no longer within
pipestat and it is not clear which spec the display engine interrupts actually
follow. It could be as simple as

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index e95ec8d..69996ca 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1499,6 +1499,9 @@ static irqreturn_t valleyview_irq_handler(int irq, void
*arg)
                if (pm_iir)
                        gen6_rps_irq_handler(dev_priv, pm_iir);

+               if (iir & DE_GSE_IVB)
+                       intel_opregion_asle_intr(dev);
+
                I915_WRITE(GTIIR, gt_iir);
                I915_WRITE(GEN6_PMIIR, pm_iir);
                I915_WRITE(VLV_IIR, iir);

but it probably requires the guilty party to come forward with the actual
information.

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