i915/uncore: Acquire fw before loop in intel_uncore_read64_2x32

PMU reads the GT timestamp as a 2x32 mmio read and since upper and lower
32 bit registers are read in a loop, there is a latency involved between
getting the GT timestamp and the CPU timestamp. As part of the
resolution, refactor intel_uncore_read64_2x32 to acquire forcewake and
uncore lock prior to reading upper and lower regs.

Signed-off-by: Umesh Nerlige Ramappa <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]>
Reviewed-by: Ashutosh Dixit <[email protected]>
Signed-off-by: John Harrison <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

0 files changed, 0 insertions, 0 deletions