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lib: save/restore MIE CSR in sbi_hart_wait_for_coldboot()

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Currently, sbi_hart_wait_for_coldboot() leaves MIE.MSIP bit
set when it returns which is not correct because MIE.MSIP
should be left enabled only by sbi_ipi_init().

This patch does save/restore of MIE CSR to ensure that MIE
CSR is in original state after sbi_hart_wait_for_coldboot()
returns.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-01-03 10:20:12 +05:30
parent 1993182f03
commit 2aa43a13cd
1 changed files with 7 additions and 0 deletions
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7
lib/sbi/sbi_hart.c
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@@ -354,12 +354,16 @@ static unsigned long coldboot_wait_bitmap = 0;
void sbi_hart_wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid)
{
unsigned long saved_mie;
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
if ((sbi_platform_hart_count(plat) <= hartid) ||
(COLDBOOT_WAIT_BITMAP_SIZE <= hartid))
sbi_hart_hang();
/* Save MIE CSR */
saved_mie = csr_read(CSR_MIE);
/* Set MSIE bit to receive IPI */
csr_set(CSR_MIE, MIP_MSIP);
@@ -382,6 +386,9 @@ void sbi_hart_wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid)
/* Release coldboot lock */
spin_unlock(&coldboot_lock);
/* Restore MIE CSR */
csr_write(CSR_MIE, saved_mie);
/* Clear current HART IPI */
sbi_platform_ipi_clear(plat, hartid);
}