[Intel-gfx] [PATCH] drm/i915: add multi-threaded forcewake support

[Keith Packard]

On Fri, 18 Nov 2011 14:12:03 -0800, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:

> No this one should be looking at the bottom bit, so I think it's ok.

Sorry, bad mail edit. There's one << 15 in both force_wake_mt_put and
force_wake_mt_get and they both need to be << 16:


+void __gen6_gt_force_wake_mt_get(struct drm_i915_private *dev_priv)
+{
+	int count;
+
+	count = 0;
+	while (count++ < 50 && (I915_READ_NOTRACE(FORCEWAKE_MT_ACK) & 1))
+		udelay(10);
+
+	I915_WRITE_NOTRACE(FORCEWAKE_MT, (1<<15) | 1);

                                           <<16

+	POSTING_READ(FORCEWAKE_MT);
+
+	count = 0;
+	while (count++ < 50 && (I915_READ_NOTRACE(FORCEWAKE_MT_ACK) & 1) == 0)
+		udelay(10);
+}
+

...

+void __gen6_gt_force_wake_mt_put(struct drm_i915_private *dev_priv)
+{
+	I915_WRITE_NOTRACE(FORCEWAKE_MT, (1<<15) | 0);

                                           <<16

+	POSTING_READ(FORCEWAKE_MT);
+}
+

> Cool, hope it'll help others too.

Let me know when you hear back from the VPG folks about how we're
supposed to know which method to use.

-- 
keith.packard at intel.com
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