Ksawlii/kernel_samsung_a53x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

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

Browse source 
commit c6bb057418876cdfdd29a6f7b8cef54539ee8811 upstream.

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

This change is inspired by commit 90b8596ac460 ("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: c26389f998a8 ("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 Ksawlii
parent 1716cad60a
commit 5439f9c255
1 changed files with 6 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/tty/serial/8250/8250_omap.c
View file

@ -1209,10 +1209,12 @@ static int omap_8250_dma_handle_irq(struct uart_port *port)
status = serial_port_in(port, UART_LSR);
if ((iir & 0x3f) != UART_IIR_THRI) {
if (priv->habit & UART_HAS_EFR2)
am654_8250_handle_rx_dma(up, iir, status);
else
status = omap_8250_handle_rx_dma(up, iir, status);
}
serial8250_modem_status(up);
if (status & UART_LSR_THRE && up->dma->tx_err) {