From: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 5df0582bf036bb5f9a8ad8db5884fe13a55347d1 ]
Looks like it was introduced in:
commit 650ad970a39f8b6164fe8613edc150f585315289
Author: Imre Deak <imre.deak@xxxxxxxxx>
Date: Fri Apr 18 16:35:02 2014 +0300
drm/i915: vlv: factor out vlv_force_gfx_clock and check for pending force-of
but I'm not sure why. It has caused problems for us in the past (see
85250ddff7a6 "drm/i915/chv: Remove Wait for a previous gfx force-off"
and 8d4eee9cd7a1 "drm/i915: vlv: increase timeout when forcing on the
GFX clock") and doesn't seem to be required, so let's just drop it.
References: https://bugs.freedesktop.org/show_bug.cgi?id=89611
Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Tested-by: Darren Hart <dvhart@xxxxxxxxxxxxxxx>
Reviewed-by: Deepak S <deepak.s@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # c9c52e24194a: drm/i915/chv: Remove Wait ...
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 14 --------------
1 file changed, 14 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 4d4838d9..59f23fc 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1245,21 +1245,7 @@ int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool force_on)
u32 val;
int err;
- val = I915_READ(VLV_GTLC_SURVIVABILITY_REG);
-
#define COND (I915_READ(VLV_GTLC_SURVIVABILITY_REG) & VLV_GFX_CLK_STATUS_BIT)
- /* Wait for a previous force-off to settle */
- if (force_on && !IS_CHERRYVIEW(dev_priv->dev)) {
- /* WARN_ON only for the Valleyview */
- WARN_ON(!!(val & VLV_GFX_CLK_FORCE_ON_BIT) == force_on);
-
- err = wait_for(!COND, 20);
- if (err) {
- DRM_ERROR("timeout waiting for GFX clock force-off (%08x)\n",
- I915_READ(VLV_GTLC_SURVIVABILITY_REG));
- return err;
- }
- }
val = I915_READ(VLV_GTLC_SURVIVABILITY_REG);
val &= ~VLV_GFX_CLK_FORCE_ON_BIT;
--
2.1.0
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