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57 lines
1.6 KiB
Diff
57 lines
1.6 KiB
Diff
From ddcf008387a37a5aa76118c77ba3554a3ef3475a Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Ond=C5=99ej=20Jirman?= <megi@xff.cz>
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Date: Sat, 2 Nov 2019 15:09:01 +0100
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Subject: mailbox: Allow to run mailbox while timekeeping is suspended
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This makes it possible to send messages from CPU suspend finisher.
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We simply implement cl->tx_block using a busywait loop when
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timekeeping is suspended, instead of using hrtimer.
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Signed-off-by: Ondrej Jirman <megi@xff.cz>
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---
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drivers/mailbox/mailbox.c | 20 +++++++++++++++++++-
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1 file changed, 19 insertions(+), 1 deletion(-)
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diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
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index 5cd8ae222073..022eeaf6cb5a 100644
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--- a/drivers/mailbox/mailbox.c
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+++ b/drivers/mailbox/mailbox.c
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@@ -73,7 +73,7 @@ static void msg_submit(struct mbox_chan *chan)
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}
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}
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- if (!err && (chan->txdone_method & TXDONE_BY_POLL)) {
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+ if (!err && (chan->txdone_method & TXDONE_BY_POLL) && !timekeeping_suspended) {
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/* kick start the timer immediately to avoid delays */
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scoped_guard(spinlock_irqsave, &chan->mbox->poll_hrt_lock)
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hrtimer_start(&chan->mbox->poll_hrt, 0, HRTIMER_MODE_REL);
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@@ -256,6 +256,24 @@ int mbox_send_message(struct mbox_chan *chan, void *mssg)
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msg_submit(chan);
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+ if (chan->cl->tx_block && timekeeping_suspended) {
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+ int i = chan->cl->tx_tout * 10;
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+ bool txdone;
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+
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+ while (i--) {
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+ txdone = chan->mbox->ops->last_tx_done(chan);
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+ if (txdone) {
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+ tx_tick(chan, 0);
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+ return 0;
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+ }
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+
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+ udelay(100);
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+ }
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+
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+ tx_tick(chan, -ETIME);
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+ return -ETIME;
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+ }
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+
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if (chan->cl->tx_block) {
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unsigned long wait;
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int ret;
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--
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2.51.0
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