drm/i915: Account for minimum ddb allocation restrictions
On icl+ bspec tells us to calculate a separate minimum ddb allocation from the blocks watermark. Both have to be checked against the actual ddb allocation, but since we do things the other way around we'll just calculat the minimum acceptable ddb allocation by taking the maximum of the two values. We'll also replace the memcmp() with a full trawl over the the watermarks so that it'll ignore the min_ddb_alloc because we can't directly read that out from the hw. I suppose we could reconstruct it from the other values, but I was too lazy to do that now. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181221171436.8218-6-ville.syrjala@linux.intel.comReviewed-by: Matt Roper <matthew.d.roper@intel.com>
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