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authorKeith Short <keithshort@chromium.org>2018-12-17 14:21:46 -0700
committerPatrick Georgi <pgeorgi@google.com>2019-01-24 13:52:43 +0000
commit514363541fd1f78cc786a0c1f8d5f047f3baebc7 (patch)
treeed1f496bf106c33d3f1385524eef1c938dc2ae18 /src/soc/mediatek/mt8183/include
parentfc707892de7319cca3dc83e03034e443b2c9f9bb (diff)
cr50: Add probe command to poll Cr50 until DID VID is valid
Added new routine cr50_i2c_probe() which ensures that communication with the Cr50 over I2C is good prior to attempting other initialization of the Cr50 and TPM state. This avoids a race condition when the Cr50 is first booting that it may reset it's I2C slave interface during the first few I2C transactions initiated from coreboot. BUG=b:120009037 BRANCH=none TEST=Run the Cr50 factory update against Careena board. Confirm that I2C reads are retried until the DID VID is valid. Tested against debug Cr50 firmware that forced failure of cr50_i2c_probe() and verfied that coreboot shows recovery screen. Change-Id: I47c59a32378ad00336277e111e81ba8d2d63e69a Signed-off-by: Keith Short <keithshort@chromium.org> Reviewed-on: https://review.coreboot.org/c/30295 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Raul Rangel <rrangel@chromium.org> Reviewed-by: Martin Roth <martinroth@google.com> Reviewed-by: Daniel Kurtz <djkurtz@google.com>
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