drm/i915/vlv: remove wait for previous GFX clk disable request
Looks like it was introduced in: commit650ad970a3
Author: Imre Deak <imre.deak@intel.com> 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 (see85250ddff7
"drm/i915/chv: Remove Wait for a previous gfx force-off" and8d4eee9cd7
"drm/i915: vlv: increase timeout when forcing on the GFX clock") and doesn't seem to be required, so let's just drop it. [airlied: I messed up a merge - readd this] References: https://bugs.freedesktop.org/show_bug.cgi?id=89611 Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Tested-by: Darren Hart <dvhart@linux.intel.com> Reviewed-by: Deepak S <deepak.s@linux.intel.com> Cc: stable@vger.kernel.org #c9c52e2419
: drm/i915/chv: Remove Wait ... Cc: stable@vger.kernel.org Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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@ -1240,21 +1240,7 @@ int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool force_on)
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u32 val;
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int err;
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val = I915_READ(VLV_GTLC_SURVIVABILITY_REG);
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#define COND (I915_READ(VLV_GTLC_SURVIVABILITY_REG) & VLV_GFX_CLK_STATUS_BIT)
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/* Wait for a previous force-off to settle */
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if (force_on && !IS_CHERRYVIEW(dev_priv->dev)) {
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/* WARN_ON only for the Valleyview */
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WARN_ON(!!(val & VLV_GFX_CLK_FORCE_ON_BIT) == force_on);
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err = wait_for(!COND, 20);
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if (err) {
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DRM_ERROR("timeout waiting for GFX clock force-off (%08x)\n",
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I915_READ(VLV_GTLC_SURVIVABILITY_REG));
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return err;
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}
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}
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val = I915_READ(VLV_GTLC_SURVIVABILITY_REG);
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val &= ~VLV_GFX_CLK_FORCE_ON_BIT;
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