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From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: Intel Graphics Development <intel-gfx@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Subject: [PATCH] drm/i915: implement WaIssueDummyWriteToWakeupFromRC6
Date: Thu, 18 Oct 2012 14:14:14 +0200
Message-ID: <1350562454-5809-1-git-send-email-daniel.vetter@ffwll.ch> (raw)
In-Reply-To: <275ffc$71to91@fmsmga002.fm.intel.com>

Or at least our best understanding of it.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/i915_drv.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index a7837e5..c3f4f04 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1131,9 +1131,20 @@ static bool IS_DISPLAYREG(u32 reg)
 	return true;
 }
 
+static void
+ilk_dummy_write(struct drm_i915_private *dev_priv)
+{
+	/* Ilk w/a: Issue a dummy write to wake up the chip from rc6 before
+	 * touching it for real. MI_MODE is masked, hence harmless to write 0
+	 * into. */
+	I915_WRITE_NOTRACE(MI_MODE, 0);
+}
+
 #define __i915_read(x, y) \
 u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg) { \
 	u##x val = 0; \
+	if (IS_GEN5(dev_priv->dev)) \
+		ilk_dummy_write(dev_priv); \
 	if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 		unsigned long irqflags; \
 		spin_lock_irqsave(&dev_priv->gt_lock, irqflags); \
@@ -1165,6 +1176,8 @@ void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val) { \
 	if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 		__fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 	} \
+	if (IS_GEN5(dev_priv->dev)) \
+		ilk_dummy_write(dev_priv); \
 	if (IS_VALLEYVIEW(dev_priv->dev) && IS_DISPLAYREG(reg)) { \
 		write##y(val, dev_priv->regs + reg + 0x180000);		\
 	} else {							\
-- 
1.7.10.4

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-18  9:49 [PATCH 0/5] pile of ilk related workarounds Daniel Vetter
2012-10-18  9:49 ` [PATCH 1/5] drm/i915: implement WaIssueDummyWriteToWakupFromRC6 Daniel Vetter
2012-10-18 11:10   ` Chris Wilson
2012-10-18 12:14     ` Daniel Vetter [this message]
2012-10-18 12:16     ` [PATCH] drm/i915: implement WaIssueDummyWriteToWakeupFromRC6 Daniel Vetter
2012-10-18 11:17   ` [PATCH 1/5] drm/i915: implement WaIssueDummyWriteToWakupFromRC6 Chris Wilson
2012-10-18 11:21     ` Daniel Vetter
2012-10-18 11:25   ` Lespiau, Damien
2012-10-18  9:49 ` [PATCH 2/5] drm/i915: implement WaDisableRenderCachePipelinedFlush Daniel Vetter
2012-10-18 11:21   ` Chris Wilson
2012-10-29 21:33     ` Daniel Vetter
2012-10-18  9:49 ` [PATCH 3/5] drm/i915: WaInsertNoopAfterBatchEndCommand Daniel Vetter
2012-10-18 11:24   ` Chris Wilson
2012-10-18 12:19     ` [PATCH] " Daniel Vetter
2012-10-18  9:49 ` [PATCH 4/5] drm/i915: implement WaDisableSpriteDestColorKey Daniel Vetter
2012-10-18 11:32   ` Chris Wilson
2012-10-18  9:49 ` [PATCH 5/5] drm/i915: document a few more already implemented ilk w/as Daniel Vetter

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