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lib: Remove redundant sbi_platform_ipi_clear() calls

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The sbi_platform_ipi_clear() called from wait_for_coldboot() and
sbi_hsm_hart_wait() is redundant because IPI will be automatically
cleared by sbi_platform_ipi_init() called from sbi_ipi_init().

Further, wait_for_coldboot() is common for warm startup and warm
resume path so the sbi_platform_ipi_clear() called in warm resume
path cause resuming HART to miss an IPI injected other HART to
wakeup the HART.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2021-02-19 09:54:05 +05:30
committed by Anup Patel
parent b9cf617a9f
commit 50d4fde1c5
3 changed files with 16 additions and 7 deletions
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11
lib/sbi/sbi_init.c
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@@ -130,7 +130,6 @@ static unsigned long coldboot_done;
static void wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid)
{
unsigned long saved_mie, cmip;
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
/* Save MIE CSR */
saved_mie = csr_read(CSR_MIE);
@@ -167,8 +166,14 @@ static void wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid)
/* Restore MIE CSR */
csr_write(CSR_MIE, saved_mie);
/* Clear current HART IPI */
sbi_platform_ipi_clear(plat, hartid);
/*
* The wait for coldboot is common for both warm startup and
* warm resume path so clearing IPI here would result in losing
* an IPI in warm resume path.
*
* Also, the sbi_platform_ipi_init() called from sbi_ipi_init()
* will automatically clear IPI for current HART.
*/
}
static void wake_coldboot_harts(struct sbi_scratch *scratch, u32 hartid)