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authorSubrata Banik <subratabanik@google.com>2022-04-11 17:58:22 +0530
committerSubrata Banik <subratabanik@google.com>2024-08-17 19:35:37 +0000
commit86ff4d12f12f1b538b61dfc59d267218db0aa26b (patch)
tree1d5a854b9ceb0e64881da70c8eef6f5f46b78dbd /src/lib/dimm_info_util.c
parent03401d259f0640344f72224b5c4e5f06a5ea01e2 (diff)
mb/google/brya: Reset XHCI controller while preparing for S5
This patch calls `xhci_host_reset()` function to perform XHCI controller reset. Currently, the PMC IPC times out while sending the USB-C (0xA7) command during poweron from S5 (S5->S4->S3->S0). On Brya variants, poweron from S5 state results in PMC error while sending PMC IPC (0xA7) to USB-C active ports, log here: localhost ~ # cbmem -c | grep ERROR [ERROR]  PMC IPC timeout after 1000 ms [ERROR]  PMC IPC command 0x200a7 failed [ERROR]  pmc_send_ipc_cmd failed [ERROR]  Failed to setup port:0 to initial state [ERROR]  PMC IPC timeout after 1000 ms [ERROR]  PMC IPC command 0x200a7 failed [ERROR]  pmc_send_ipc_cmd failed [ERROR]  Failed to setup port:1 to initial state [ERROR]  PMC IPC timeout after 1000 ms [ERROR]  PMC IPC command 0x20a0 failed This problem is not seen while powering on from G3 (G3->S5->S4->S3->S0). During poweron the state of USB ports are not the same between S5 and G3 and it appears that the active USB port still is in U3 (suspend) while PMC tries to send the IPC command, which results in a timeout. This patch utilises the S5 SMI handler to reset the XHCI controller using `xhci_host_reset()` prior entering into the S5, it helps to restore the port state to active hence, no PMC timeout is seen with this code change. Supporting Doc=Intel expected to release a TA (Technical Advisory) document to acknowledge this observation and supported W/A for ADL generation platforms. Till that time, keeping this W/A as part of the google/brya specific mainboard alone. Note: other ADL-SoC based mainboards might need to apply the similar W/A. BUG=b:227289581 TEST=No PMC timeout is observed while sending USB-C PMC command (0xA7) during resume from S5. Total Time: 1,045,855 localhost ~ # cbmem -c | grep ERROR No PMC timeout error is observed with this CL. Signed-off-by: Subrata Banik <subratabanik@google.com> Change-Id: Ibf06a64f055a0cee3659b410652082f31e18e149 Reviewed-on: https://review.coreboot.org/c/coreboot/+/63552 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Diffstat (limited to 'src/lib/dimm_info_util.c')
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