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serial: 8250_lpss: Enable DMA on Intel Elkhart Lake
PSE UARTs on Intel Elkhart Lake support DMA mode. Enable DMA on these ports. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210721162452.48764-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -158,6 +158,16 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
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static int ehl_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
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{
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struct uart_8250_dma *dma = &lpss->data.dma;
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struct uart_8250_port *up = up_to_u8250p(port);
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/*
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* This simply makes the checks in the 8250_port to try the DMA
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* channel request which in turn uses the magic of ACPI tables
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* parsing (see drivers/dma/acpi-dma.c for the details) and
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* matching with the registered General Purpose DMA controllers.
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*/
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up->dma = dma;
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return 0;
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}
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