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mailbox: tegra-hsp: Flush whole channel

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commit 60de2d2dc284e0dd1c2c897d08625bde24ef3454 upstream.

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

This fixes an issue with the Tegra Combined UART (TCU) where output can
get truncated under high traffic load.

Signed-off-by: Pekka Pessi <[email protected]>
Tested-by: Jon Hunter <[email protected]>
Fixes: 91b1b1c3da ("mailbox: tegra-hsp: Add support for shared mailboxes")
Cc: [email protected]
Signed-off-by: Thierry Reding <[email protected]>
Reviewed-by: Jon Hunter <[email protected]>
Signed-off-by: Jassi Brar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Pekka Pessi 2022-03-02 16:04:24 +01:00 • committed by Greg Kroah-Hartman
commit 8d3a7b2064
1 changed files with 5 additions and 0 deletions
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5
drivers/mailbox/tegra-hsp.c
View file

@ -403,6 +403,11 @@ 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;
}