tree 62692ee5aa2c45b53c50388401f881f92c837ca3
parent effbc4fd8e37e41d6f2bb6bcc611c14b4fbdcf9b
author Ben Widawsky <ben@bwidawsk.net> 1332899978 -0700
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1334258044 +0200

drm/i915: add rc6 residency times to debugfs

RC6 residency should be in intervals of 1.28us, and the counter wraps.
Here is an example using awk to get the various RC6 and RC6+ residency
times in seconds, since boot.

cat /sys/kernel/debug/dri/0/i915_drpc_info  | grep residency | awk -F':' -F' '  '{print $5 * 1.28 / 1000000}'

This is primarily for QA, but has other applications as well. An
upcoming patch to add interfaces should be more interesting to
application developers.

v2: move comment to the correct place

v3: display with %u instead of %d, for Ouping

CC: Ouping Zhang <ouping.zhang@intel.com>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Ben Widawsky <benjamin.widawsky@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>