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authorZhuo-hao Lee <zhuo-hao.lee@intel.com>2017-03-14 10:27:28 +0800
committerAaron Durbin <adurbin@chromium.org>2017-03-17 03:36:09 +0100
commit07f60aa56fefa0aeb4f896d63267a54ddfae0715 (patch)
tree4ea54d893074df433f7c5f24e75fdd4abf30c930 /src/acpi
parent6f80ccc357702f87baf43440d97a49bcce999393 (diff)
soc/intel/apollolake: Reduce D3 cold delay for eMMC controller
eMMC Controller is taking over 100ms to resume during runtime which results in I/O latency issues on the Apollo Lake system such as Snappy. The cause is the Linux Kernel setting the firmware reset time to 100 ms by default. This patch adds _DSM method for eMMC comtroller for specifying the device readiness durations. Function index 9 returns package of five integers to set D3 cold delay to zero and ACPI constant Ones for the elements where overriding the default values is not desired. BUG=b:35774937 BRANCH=none TEST=update snappy coreboot and test i/o latency is under 100ms Signed-off-by: Zhuo-hao Lee <zhuo-hao.lee@intel.com> Signed-off-by: Sowmya V <v.sowmya@intel.com> Change-Id: Idcfe4252b20bead15c2e5b9cb000ff797295f06a Reviewed-on: https://review.coreboot.org/18806 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
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