提交 05adaf1f 编写于 作者: J Jani Nikula

drm/i915/vlv: reset VLV media force wake request register

Media force wake get hangs the machine when the system is booted without
displays attached. The assumption is that (at least some versions of)
the firmware has skipped some initialization in that case.

Empirical evidence suggests we need to reset the media force wake
request register in addition to the render one to avoid hangs.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75895Reported-by: NImre Deak <imre.deak@intel.com>
Reported-by: NDarren Hart <dvhart@linux.intel.com>
Tested-by: NDarren Hart <dvhart@linux.intel.com>
Reviewed-by: NMika Kuoppala <mika.kuoppala@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
上级 e4c610fe
......@@ -185,6 +185,8 @@ static void vlv_force_wake_reset(struct drm_i915_private *dev_priv)
{
__raw_i915_write32(dev_priv, FORCEWAKE_VLV,
_MASKED_BIT_DISABLE(0xffff));
__raw_i915_write32(dev_priv, FORCEWAKE_MEDIA_VLV,
_MASKED_BIT_DISABLE(0xffff));
/* something from same cacheline, but !FORCEWAKE_VLV */
__raw_posting_read(dev_priv, FORCEWAKE_ACK_VLV);
}
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册