[Intel-gfx] [PATCH] drm/i915: Skip i915_swizzle_info in platforms without GPU side swizzle

[Michel Thierry]

On 6/29/2017 6:07 AM, Chris Wilson wrote:
> Quoting Ville Syrjälä (2017-06-29 14:05:25)
>> On Wed, Jun 28, 2017 at 04:24:27PM -0700, Michel Thierry wrote:
>>> There's no need to keep reading random registers in i915_swizzle_info if
>>> the platform is not doing GPU side swizzling.
>>>
>>> After HSW, swizzling is not used, and the CPU's memory controller
>>> performs all the address swizzling modifications, commit be292e1563ac5b
>>> ("drm/i915/bdw: Let the memory controller do all the swizzling").
>>
>> But BDW still contains the registers and hardware capability no? So
>> might be a good idea to be able to check that it's not misconfigured.
> 
> Especially in debugfs where it is useful to show both the hw state and
> what we thought it should be.

Hi,

Yes, the registers are still there (but this may change). Are you ok if 
I change this to apply only to GEN9+?