[PATCH v3] riscv: acpi: Handle LPI architectural context loss flags

[Paul Walmsley]

On Mon, 3 Aug 2026, Peixin Xie wrote:

> Commit 4785aa802853 ("cpuidle, ACPI: Evaluate LPI arch_flags for
> broadcast timer") replaced the generic nonzero check for LPI
> architectural context loss flags with arch_get_idle_state_flags().
> RISC-V does not implement the helper, so it falls back to the stub
> that returns 0. Consequently, CPUIDLE_FLAG_TIMER_STOP is not set when
> an LPI state loses the hart timer context, preventing cpuidle from
> using a broadcast timer for that state.
> 
> Implement the RISC-V helper and map the hart timer context loss flag
> to CPUIDLE_FLAG_TIMER_STOP.
> 
> Fixes: 4785aa802853 ("cpuidle, ACPI: Evaluate LPI arch_flags for broadcast timer")
> Cc: stable at vger.kernel.org
> Acked-by: Sudeep Holla <sudeep.holla at kernel.org>
> Reviewed-by: Yixun Lan <dlan at kernel.org>
> Reviewed-by: Sunil V L <sunilvl at oss.qualcomm.com>
> Reviewed-by: Huisong Li <lihuisong at huawei.com>
> Signed-off-by: Peixin Xie <peixin.xie at linux.spacemit.com>

Thanks, queued for v7.3.


- Paul