drm/i915: Added debugfs support for PSR Status
Adding support for PSR Status, PSR entry counter and performance counters. Heavily based on initial work from Shobhit. v2: Fix PSR Status Link bits by Paulo Zanoni. v3: Prefer seq_puts to seq_printf by Paulo Zanoni. v4: Fix identation by Paulo Zanoni. v5: Return earlier if it isn't Haswell in order to avoid reading non-existing registers - by Paulo Zanoni. CC: Paulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Credits-by: NShobhit Kumar <shobhit.kumar@intel.com> Signed-off-by: NRodrigo Vivi <rodrigo.vivi@gmail.com> Reviewed-by: NShobhit Kumar <shobhit.kumar@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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