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Why: If the reg mmMP1_SMN_C2PMSG_90 is being written to during amdgpu driver load or driver unload, subsequent amdgpu driver load will fail at smu_hw_init. The default of mmMP1_SMN_C2PMSG_90 register at a clean environment is 0x1 and if value differs from expected, amdgpu driver load will fail. How to fix: Ignore the initial value in smu response register before the first smu message is sent,if smc in SMU_FW_INIT state, just proceed further to send the message. If register holds an unexpected value after smu message was sent set, smc_state to SMU_FW_HANG state and no further smu messages will be sent. v2: Set SMU_FW_INIT state at the start of smu hw_init/resume. Check smc_fw_state before sending smu message if in hang state skip sending message. Set SMU_FW_HANG only in case unexpected value is detected Signed-off-by: Danijel Slivka <danijel.slivka@amd.com> Reviewed-by: Kenneth Feng <kenneth.feng@amd.com> Reviewed-by: Lijo Lazar <lijo.lazar@amd.com> Reviewed-by: Asad Kamal <asad.kamal@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
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| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
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| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.