[Intel-gfx] [PATCH 11/21] drm/i915: Remove impossible path from i915_gem_init_swizzling

[Chris Wilson]

Quoting Tvrtko Ursulin (2019-06-06 10:36:29)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Gen8+ does not have swizziling so function will exit on the top most check.
> 
> At the same time convert the BUG to MISSING_CASE for a little more debug
> info.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_gem.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 8eee9ecf0adf..7512c804d4b7 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -1216,10 +1216,8 @@ void i915_gem_init_swizzling(struct drm_i915_private *dev_priv)
>                 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_SNB));
>         else if (IS_GEN(dev_priv, 7))
>                 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_IVB));
> -       else if (IS_GEN(dev_priv, 8))
> -               I915_WRITE(GAMTARBMODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_BDW));

But that is the register we would need to set if we choose to reenable
swizzling for whatever mysterious reason.
-Chris