Edward O'Callaghan has uploaded this change for review.
raiden_debug_spi.c: Add a delay following AP/EC flash enable
Add a delay following the AP and EC flash enable requests. This allows
any power rails enabled by these signals to settle and to meet the power
on to first SPI write timing requirements.
Forward ports the downstream commit:
https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/2036738
Change-Id: I4c1777777ee67580605c6e6f4c0c228cccc392c7
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
---
M raiden_debug_spi.c
1 file changed, 9 insertions(+), 0 deletions(-)
git pull ssh://review.coreboot.org:29418/flashrom refs/changes/12/39312/1
diff --git a/raiden_debug_spi.c b/raiden_debug_spi.c
index fa42268..6914455 100644
--- a/raiden_debug_spi.c
+++ b/raiden_debug_spi.c
@@ -562,6 +562,15 @@
return ret;
}
+ /*
+ * Allow for power to settle on the AP and EC flash devices.
+ * Load switches can have a 1-3 ms turn on time, and SPI flash devices
+ * can require up to 10 ms from power on to the first write.
+ */
+ if ((request_enable == RAIDEN_DEBUG_SPI_REQ_ENABLE_AP) ||
+ (request_enable == RAIDEN_DEBUG_SPI_REQ_ENABLE_EC))
+ usleep(50 * 1000);
+
register_spi_master(&spi_master_raiden_debug);
register_shutdown(shutdown, NULL);
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