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soc: qcom: aoss: Read back before triggering the IRQ

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In some device memory used by msm_qmp, there can be an early ack of a
write to memory succeeding. This may cause the outgoing interrupt to be
triggered before the msgram reflects the write.

Add a readback to ensure the data is flushed to device memory before
triggering the ipc interrupt.

Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Link: https://lore.kernel.org/r/1579681454-1229-1-git-send-email-aneela@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Arun Kumar Neelakantam 2020-01-22 13:54:13 +05:30 committed by Bjorn Andersson
parent df636eea2b
commit 89e7eddece
1 changed files with 4 additions and 0 deletions
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4
drivers/soc/qcom/qcom_aoss.c
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@ -225,6 +225,7 @@ static bool qmp_message_empty(struct qmp *qmp)
static int qmp_send(struct qmp *qmp, const void *data, size_t len)
{
long time_left;
size_t tlen;
int ret;
if (WARN_ON(len + sizeof(u32) > qmp->size))
@ -239,6 +240,9 @@ static int qmp_send(struct qmp *qmp, const void *data, size_t len)
__iowrite32_copy(qmp->msgram + qmp->offset + sizeof(u32),
data, len / sizeof(u32));
writel(len, qmp->msgram + qmp->offset);
/* Read back len to confirm data written in message RAM */
tlen = readl(qmp->msgram + qmp->offset);
qmp_kick(qmp);
time_left = wait_event_interruptible_timeout(qmp->event,