Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> In the previous patch (to include a rmb() after readig the CSB WRITE
> pointer from the HWSP) we believe we have fixed the underlying bug, and
> so can re-enable using the HWSP on Cannolake.
>
> This reverts commit 61bf9719fa17 ("drm/i915/cnl: Use mmio access to
> context status buffer").
>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=105888
> References: https://bugs.freedesktop.org/show_bug.cgi?id=106185
> References: 61bf9719fa17 ("drm/i915/cnl: Use mmio access to context status buffer")
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> Cc: Michał Winiarski <michal.winiarski@xxxxxxxxx>
> Cc: Rafael Antognolli <rafael.antognolli@xxxxxxxxx>
> Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
> Cc: Timo Aaltonen <tjaalton@xxxxxxxxxx>
> Tested-by: Timo Aaltonen <tjaalton@xxxxxxxxxx>
Acked-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_engine_cs.c | 3 ---
> 1 file changed, 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
> index 70325e0824e3..8303e05b0c7d 100644
> --- a/drivers/gpu/drm/i915/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/intel_engine_cs.c
> @@ -470,9 +470,6 @@ static bool csb_force_mmio(struct drm_i915_private *i915)
> if (intel_vgpu_active(i915) && !intel_vgpu_has_hwsp_emulation(i915))
> return true;
>
> - if (IS_CANNONLAKE(i915))
> - return true;
> -
> return false;
> }
>
> --
> 2.17.0
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