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authorJeffy Chen <jeffy.chen@rock-chips.com>2017-03-03 18:24:02 +0800
committerFurquan Shaikh <furquan@google.com>2017-04-05 20:28:39 +0200
commitf9a40ea28f1c856289cd4adf04224fad096b4a4d (patch)
treef3527348dca641c7933d0a5596e65eb0ac240b9e /src/drivers/spi
parent3255839be15bcccde652891354e91965733f8a86 (diff)
downloadcoreboot-f9a40ea28f1c856289cd4adf04224fad096b4a4d.tar.xz
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)
Diffstat (limited to 'src/drivers/spi')
-rw-r--r--src/drivers/spi/tpm/tpm.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/drivers/spi/tpm/tpm.c b/src/drivers/spi/tpm/tpm.c
index fd924f4246..29b85c4716 100644
--- a/src/drivers/spi/tpm/tpm.c
+++ b/src/drivers/spi/tpm/tpm.c
@@ -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