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arm: socfpga: mailbox: Refactor mailbox timeout event handling

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Add miliseconds delay when waiting for mailbox event to happen
before timeout. This will ensure the timeout duration is predictive.

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
This commit is contained in:
Chee Hong Ang 2020-08-12 09:56:21 +08:00 committed by Ley Foon Tan
parent e2afbee50c
commit e3fca5072b
1 changed files with 9 additions and 4 deletions
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13
arch/arm/mach-socfpga/mailbox_s10.c
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@ -29,13 +29,14 @@ DECLARE_GLOBAL_DATA_PTR;
static __always_inline int mbox_polling_resp(u32 rout)
{
u32 rin;
unsigned long i = ~0;
unsigned long i = 2000;
while (i) {
rin = MBOX_READL(MBOX_RIN);
if (rout != rin)
return 0;
udelay(1000);
i--;
}
@ -176,11 +177,15 @@ static __always_inline int mbox_send_cmd_common(u8 id, u32 cmd, u8 is_indirect,
MBOX_WRITEL(1, MBOX_DOORBELL_TO_SDM);
while (1) {
ret = ~0;
ret = 1000;
/* Wait for doorbell from SDM */
while (!MBOX_READL(MBOX_DOORBELL_FROM_SDM) && ret--)
;
do {
if (MBOX_READL(MBOX_DOORBELL_FROM_SDM))
break;
udelay(1000);
} while (--ret);
if (!ret)
return -ETIMEDOUT;