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lib: sbi_hsm: Use csr_set to restore the MIP

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If we use the csr_write to restore the MIP, we may clear the SEIP.
In generic behavior of QEMU, if the pending bits of PLIC are set and we
clear the SEIP, the QEMU may not set it back immediately. It may cause
the interrupts won't be handled anymore until the new interrupts arrived
and QEMU set the bits back.

Signed-off-by: Nick Hu <nick.hu@sifive.com>
Signed-off-by: Jim Shu <jim.shu@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Nick Hu authored and Anup Patel committed 2023-02-08 10:39:21 +05:30
1 parent 8050081f68
commit 84d15f4f52
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lib/sbi/sbi_hsm.c
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@@ -357,7 +357,7 @@ static void __sbi_hsm_suspend_non_ret_restore(struct sbi_scratch *scratch)
hart_data_offset);
csr_write(CSR_MIE, hdata->saved_mie);
csr_write(CSR_MIP, (hdata->saved_mip & (MIP_SSIP | MIP_STIP)));
csr_set(CSR_MIP, (hdata->saved_mip & (MIP_SSIP | MIP_STIP)));
}
void sbi_hsm_hart_resume_start(struct sbi_scratch *scratch)