[PATCH 0/7] Fix and improve the Andes ATCSMU and LLC drivers

[Anup Patel]

On Tue, Jul 28, 2026 at 1:41 PM Ben Zong-You Xie <ben717 at andestech.com> wrote:
>
> Fixes and cleanups for the Andes last level cache, HSM and suspend
> drivers, collected while bringing up suspend to RAM on the AE350
> platform.
>
> Below is the summary of this patch set:
> - Patch 1 makes andes_llcache_enable() return 0 on success, as the
>   cache_enable() callback is documented to. Nothing checks it today, but
>   patch 7 does.
> - Patch 2 puts the SMU and LLC register regions in the root domain, so
>   the supervisor can reach them under Smepmp.
> - Patch 3 pairs the non-retentive CSR save and restore with an explicit
>   flag instead of inferring it from the boot count and sleep type.
> - Patch 4 restores those CSRs on the system-suspend resume path, which
>   never reached the old call site.
> - Patch 5 wakes a sleeping hart with a plain IPI and drops the SMU
>   WAKEUP_CMD path.
> - Patch 6 polls the secondary harts until they are really asleep instead
>   of checking once.
> - Patch 7 arms the SMU last and unwinds an aborted suspend rather than
>   leaving the hart half configured.
>
> Signed-off-by: Ben Zong-You Xie <ben717 at andestech.com>
>
> Ben Zong-You Xie (7):
>   lib: utils/cache: fix andes_llcache_enable() return value
>   lib: utils/andes: add the SMU and LLC registers to the root domain
>   platform: generic/andes: pair non-retentive CSR save/restore with a
>     flag
>   lib: utils/suspend: restore Andes CSRs on system-suspend resume
>   lib: utils/hsm: wake sleeping Andes harts with an IPI
>   lib: utils/suspend: wait for the secondary Andes harts to sleep
>   lib: utils/andes: arm the SMU sleep command last

Applied this series to the riscv/opensbi repo.

Thanks,
Anup

>
>  include/sbi_utils/hsm/fdt_hsm_andes_atcsmu.h |  8 ++-
>  lib/utils/cache/fdt_andes_llcache.c          | 23 +++++--
>  lib/utils/hsm/fdt_hsm_andes_atcsmu.c         | 64 ++++++++----------
>  lib/utils/suspend/fdt_suspend_andes_atcsmu.c | 70 ++++++++++++++------
>  platform/generic/andes/ae350.c               | 26 ++++++--
>  platform/generic/include/andes/andes.h       |  4 ++
>  6 files changed, 129 insertions(+), 66 deletions(-)
>
> --
> 2.34.1
>
> --
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