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drivers/spi/tpm: try to wake cr50 if it is asleep 

BUG=b:35775002
TEST=boot from bob

Change-Id: I6324f3c02da55a8527f085ba463cbb1f4fb5dc2e
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/452283
Commit-Ready: Caesar Wang <wxt@rock-chips.com>
Tested-by: Caesar Wang <wxt@rock-chips.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/19112
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
This commit is contained in:
Jeffy Chen 2017-03-03 18:24:02 +08:00 committed by Furquan Shaikh
parent 3255839be1
commit f9a40ea28f
1 changed files with 6 additions and 0 deletions
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6
src/drivers/spi/tpm/tpm.c
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@ -121,6 +121,12 @@ static int start_transaction(int read_write, size_t bytes, unsigned addr)
*/
mdelay(10);
/* Try to wake cr50 if it is asleep. */
tpm_if.cs_assert(&tpm_if.slave);
udelay(1);
tpm_if.cs_deassert(&tpm_if.slave);
udelay(100);
/*
* The first byte of the frame header encodes the transaction type
* (read or write) and transfer size (set to lentgh - 1), limited to