07f60aa56f
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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| .. | ||
| apollolake | ||
| baytrail | ||
| braswell | ||
| broadwell | ||
| common | ||
| fsp_baytrail | ||
| fsp_broadwell_de | ||
| quark | ||
| sch | ||
| skylake | ||