[coreboot-gerrit] Change in coreboot[master]: drivers/spi/tpm: try to wake cr50 if it is asleep

[Furquan Shaikh (Code Review)]

Hello Julius Werner,

I'd like you to do a code review.  Please visit

    https://review.coreboot.org/19112

to review the following change.


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

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 at rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/452283
Commit-Ready: Caesar Wang <wxt at rock-chips.com>
Tested-by: Caesar Wang <wxt at rock-chips.com>
Reviewed-by: Julius Werner <jwerner at chromium.org>
---
M src/drivers/spi/tpm/tpm.c
1 file changed, 6 insertions(+), 0 deletions(-)


  git pull ssh://review.coreboot.org:29418/coreboot refs/changes/12/19112/1

diff --git a/src/drivers/spi/tpm/tpm.c b/src/drivers/spi/tpm/tpm.c
index fd924f4..341419c 100644
--- a/src/drivers/spi/tpm/tpm.c
+++ b/src/drivers/spi/tpm/tpm.c
@@ -121,6 +121,12 @@
 	 */
 	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

-- 
To view, visit https://review.coreboot.org/19112
To unsubscribe, visit https://review.coreboot.org/settings

Gerrit-MessageType: newchange
Gerrit-Change-Id: I6324f3c02da55a8527f085ba463cbb1f4fb5dc2e
Gerrit-PatchSet: 1
Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-Owner: Furquan Shaikh <furquan at google.com>
Gerrit-Reviewer: Julius Werner <jwerner at chromium.org>