Jani Nikula <jani.nik...@intel.com> writes:
> 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=75895
> Reported-by: Imre Deak <imre.d...@intel.com>
> Reported-by: Darren Hart <dvh...@linux.intel.com>
> Cc: sta...@vger.kernel.org
> Signed-off-by: Jani Nikula <jani.nik...@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuopp...@intel.com>
> ---
>
> Darren, a Tested-by would be much appreciated!
>
> Thanks,
> Jani.
> ---
> drivers/gpu/drm/i915/intel_uncore.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c
> b/drivers/gpu/drm/i915/intel_uncore.c
> index 76dc185793ce..27fe2df47d73 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -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);
> }
> --
> 1.9.1
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx
