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raiden_debug_spi.c: Add a delay following AP/EC flash enable

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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>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/39312
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Edward O'Callaghan 2020-03-05 15:12:29 +11:00 committed by Edward O'Callaghan
parent 8b191f5ced
commit 3e67cb7b78
1 changed files with 9 additions and 0 deletions
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9
raiden_debug_spi.c
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@ -562,6 +562,15 @@ loop_end:
return ret; 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_spi_master(&spi_master_raiden_debug);
register_shutdown(shutdown, NULL); register_shutdown(shutdown, NULL);