[PATCH] mailbox: tegra-hsp: Flush whole channel

[Thierry Reding]

From: Pekka Pessi <ppessi@xxxxxxxxxx>

The txdone can re-fill the mailbox. Keep polling the mailbox during the
flush until all the messages have been delivered.

Signed-off-by: Pekka Pessi <ppessi@xxxxxxxxxx>
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
 drivers/mailbox/tegra-hsp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
index acd0675da681..78f7265039c6 100644
--- a/drivers/mailbox/tegra-hsp.c
+++ b/drivers/mailbox/tegra-hsp.c
@@ -412,6 +412,11 @@ static int tegra_hsp_mailbox_flush(struct mbox_chan *chan,
 		value = tegra_hsp_channel_readl(ch, HSP_SM_SHRD_MBOX);
 		if ((value & HSP_SM_SHRD_MBOX_FULL) == 0) {
 			mbox_chan_txdone(chan, 0);
+
+			/* Wait until channel is empty */
+			if (chan->active_req != NULL)
+				continue;
+
 			return 0;
 		}
 
-- 
2.35.1