[Intel-gfx] [PATCH] drm/i915: increase default latency constant (v2 w/comment)
jbarnes at virtuousgeek.org
Mon Aug 31 19:24:31 CEST 2009
Some i915/i945 platforms have a fairly high memory latency in certain
situations, so increase our constant a bit to avoid FIFO underruns.
The effect should be positive on other platforms as well; we'll have a
bit more insurance against a busy memory subsystem due to the extra
Fixes fdo bug #23368. Needed for 2.6.31.
Tested-by: Sven Arvidsson <sa at whiz.se>
Tested-by: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c4b17a7..3c94451 100644
@@ -2064,7 +2064,21 @@ static void igd_enable_cxsr(struct drm_device *dev, unsigned long clock,
-const static int latency_ns = 3000; /* default for non-igd platforms */
+ * Latency for FIFO fetches is dependent on several factors:
+ * - memory configuration (speed, channels)
+ * - chipset
+ * - current MCH state
+ * It can be fairly high in some situations, so here we assume a fairly
+ * pessimal value. It's a tradeoff between extra memory fetches (if we
+ * set this value too high, the FIFO will fetch frequently to stay full)
+ * and power consumption (set it too low to save power and we might see
+ * FIFO underruns and display "flicker").
+ * A value of 5us seems to be a good balance; safe for very low end
+ * platforms but not overly aggressive on lower latency configs.
+const static int latency_ns = 5000;
static int intel_get_fifo_size(struct drm_device *dev, int plane)
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