serial: 8250: 8250_omap: Do not start RX DMA on THRI interrupt

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commit c6bb057418 upstream.

Starting RX DMA on THRI interrupt is too early because TX may not have
finished yet.

This change is inspired by commit 90b8596ac4 ("serial: 8250: Prevent
starting up DMA Rx on THRI interrupt") and fixes DMA issues I had with
an AM62 SoC that is using the 8250 OMAP variant.

Cc: stable@vger.kernel.org
Fixes: c26389f998 ("serial: 8250: 8250_omap: Add DMA support for UARTs on K3 SoCs")
Signed-off-by: Ronald Wahl <ronald.wahl@raritan.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20231101171431.16495-1-rwahl@gmx.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Ronald Wahl 2023-11-01 18:14:31 +01:00 • committed by Greg Kroah-Hartman

parent 638a6cbace

commit d59dafa9eb

1 changed files with 6 additions and 4 deletions

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drivers/tty/serial/8250/8250_omap.c

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