linux/drivers/gpu
Chris Wilson e0e8c7cb6e drm/i915: Stop using RP_DOWN_EI on Baytrail
On Baytrail, we manually calculate busyness over the evaluation interval
to avoid issues with miscaluations with RC6 enabled. However, it turns
out that the DOWN_EI interrupt generator is completely bust - it
operates in two modes, continuous or never. Neither of which are
conducive to good behaviour. Stop unmask the DOWN_EI interrupt and just
compute everything from the UP_EI which does seem to correspond to the
desired interval.

v2: Fixup gen6_rps_pm_mask() as well
v3: Inline vlv_c0_above() to combine the now identical elapsed
calculation for up/down and simplify the threshold testing

Fixes: 43cf3bf084 ("drm/i915: Improved w/a for rps on Baytrail")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: <stable@vger.kernel.org> # v4.1+
Link: http://patchwork.freedesktop.org/patch/msgid/20170309211232.28878-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
2017-03-10 14:28:39 +00:00
..
drm drm/i915: Stop using RP_DOWN_EI on Baytrail 2017-03-10 14:28:39 +00:00
host1x gpu: host1x: Set OF node for new host1x devices 2017-01-30 11:47:44 +01:00
ipu-v3 gpu: ipu-v3: Stop overwriting pdev->dev.of_node of child devices 2017-02-17 08:04:27 +01:00
vga Merge tag 'drm-misc-next-2017-03-06' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-03-07 13:59:53 +10:00
Makefile