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authorV Sowmya <v.sowmya@intel.com>2019-03-19 19:55:14 +0530
committerFurquan Shaikh <furquan@google.com>2019-06-07 18:54:44 +0000
commit3c8c81b1acd06c2145e6f837041a4d1e961b8d05 (patch)
tree8ac7538ff48f3717532468e2c3923a1e3e429263 /src/include/imd.h
parent1044ebaa06d8932564fa3ca3b0c4fbd25a63d992 (diff)
soc/intel/cannonlake: Add _DSM method for SD controller
The SD controller seems to take some time after restarting the clock at 1.8V before it actually switches from 3.3V to 1.8V. Add a _DSM method that simply sleeps when switching between 3.3V and 1.8V. Otherwise, the kernel times out too quickly waiting for the card to acknowledge the 1.8V switch. The card itself is waiting until it sees the clk signal being driven at 1.8V. BUG=b:125441242 TEST=Boot Hatch with SD card and CR2 removed, observe voltage switch succeeds. Change-Id: I15090ed9f9bc90b35dfcba47c913e3d37b799d0b Signed-off-by: V Sowmya <v.sowmya@intel.com> Signef-off-by: Evan Green <evgreen@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/33233 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org> Reviewed-by: Furquan Shaikh <furquan@google.com>
Diffstat (limited to 'src/include/imd.h')
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