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serial: 8250_lpss: Configure DMA also w/o DMA filter

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commit 1bfcbe5805d0cfc83c3544dcd01e0a282c1f6790 upstream.

If the platform doesn't use DMA device filter (as is the case with
Elkhart Lake), whole lpss8250_dma_setup() setup is skipped. This
results in skipping also *_maxburst setup which is undesirable.
Refactor lpss8250_dma_setup() to configure DMA even if filter is not
setup.

Cc: stable <[email protected]>
Signed-off-by: Ilpo Järvinen <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Ilpo Järvinen 2022-11-08 14:19:50 +02:00 • committed by Greg Kroah-Hartman
commit 89c0c27ab3
1 changed files with 11 additions and 4 deletions
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15
drivers/tty/serial/8250/8250_lpss.c
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@ -258,8 +258,13 @@ static int lpss8250_dma_setup(struct lpss8250 *lpss, struct uart_8250_port *port
struct dw_dma_slave *rx_param, *tx_param;
struct device *dev = port->port.dev;
if (!lpss->dma_param.dma_dev)
if (!lpss->dma_param.dma_dev) {
dma = port->dma;
if (dma)
goto out_configuration_only;
return 0;
}
rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL);
if (!rx_param)
@ -270,16 +275,18 @@ static int lpss8250_dma_setup(struct lpss8250 *lpss, struct uart_8250_port *port
return -ENOMEM;
*rx_param = lpss->dma_param;
dma->rxconf.src_maxburst = lpss->dma_maxburst;
*tx_param = lpss->dma_param;
dma->txconf.dst_maxburst = lpss->dma_maxburst;
dma->fn = lpss8250_dma_filter;
dma->rx_param = rx_param;
dma->tx_param = tx_param;
port->dma = dma;
out_configuration_only:
dma->rxconf.src_maxburst = lpss->dma_maxburst;
dma->txconf.dst_maxburst = lpss->dma_maxburst;
return 0;
}