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672ea89dba
Similar to the TPM SPI interface, added code to disable sleep an I2CS interrupt is received. Enabling sleep follwoing a 1 second delay when the TPM fifo register has been read by the host. The I2CS TPM layer doesn't know when a command has finished, but the one second delay is more than enough delay since sleep will be disabled again when the next I2CS interrupt is received. BRANCH=none BUG=chrome-os-partner:40397 TEST=manual Tested without these changes first. Shortened sleep delay to 30 seconds, and disconnected suzyq. Waited 30 seconds then issued the command on the AP console: tpmc read 0x1007 0xa [ 59.796813] tpm tpm0: tpm_transmit: tpm_send: error -16 ERROR: write failure to TPM device: Device or resource busy In addition, using logic analyzer verifed that there was activity on SDA/SCL but no response from Cr50. With this CL in place, ran the test and got the following: tpmc read 0x1007 0xa 2 0 1 0 1 0 0 0 0 4f With the logic analyzer I was able to confirm that there was no activity from the host on the I2CS bus until the command was issued. Change-Id: If07573ae8f72b983bca57979d53c22660b91b95e Signed-off-by: Scott <scollyer@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/387910 Commit-Ready: Scott Collyer <scollyer@chromium.org> Tested-by: Scott Collyer <scollyer@chromium.org> Reviewed-by: Bill Richardson <wfrichar@chromium.org> Reviewed-by: Mary Ruthven <mruthven@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly