drm/i915: Deal with machines that expose less than three QGV points
When SAGV is forced to disabled/min/med/max in the BIOS pcode will only hand us a single QGV point instead of the normal three. Fix the code to deal with that instead declaring the bandwidth limit to be 0 MB/s (and thus preventing any planes from being enabled). Also shrink the max_bw sturct a bit while at it, and change the deratedbw type to unsigned since the code returns the bw as an unsigned int. Since we now keep track of how many qgv points we got from pcode we can drop the earlier check added for the "pcode doesn't support the memory subsystem query" case. Cc: felix.j.degrood@intel.com Cc: Mark Janes <mark.a.janes@intel.com> Cc: Matt Roper <matthew.d.roper@intel.com> Cc: Clint Taylor <Clinton.A.Taylor@intel.com> Fixes: c457d9cf ("drm/i915: Make sure we have enough memory bandwidth on ICL") Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110838Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190606124210.3482-1-ville.syrjala@linux.intel.comReviewed-by: Matt Roper <matthew.d.roper@intel.com>
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