arm: socfpga: mailbox: Refactor mailbox timeout event handling
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>
diff --git a/arch/arm/mach-socfpga/mailbox_s10.c b/arch/arm/mach-socfpga/mailbox_s10.c
index f30e7f8..729d9b0 100644
--- a/arch/arm/mach-socfpga/mailbox_s10.c
+++ b/arch/arm/mach-socfpga/mailbox_s10.c
@@ -29,13 +29,14 @@
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 @@
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;