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serial: 8250_dw: Fix runtime PM handling

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When using kgdb, you get an abort when accessing the UART registers.
This is because the driver has already entered runtime PM and so turned
off the bus clock needed to access the registers.

To fix this, set the capability indicating Runtime PM is active while idle.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Phil Edworthy 2018-05-10 15:13:56 +01:00 committed by Greg Kroah-Hartman
parent 13dc04d0e5
commit d76c74387e
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/8250/8250_dw.c
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@ -576,6 +576,10 @@ static int dw8250_probe(struct platform_device *pdev)
if (!data->skip_autocfg) if (!data->skip_autocfg)
dw8250_setup_port(p); dw8250_setup_port(p);
#ifdef CONFIG_PM
uart.capabilities |= UART_CAP_RPM;
#endif
/* If we have a valid fifosize, try hooking up DMA */ /* If we have a valid fifosize, try hooking up DMA */
if (p->fifosize) { if (p->fifosize) {
data->dma.rxconf.src_maxburst = p->fifosize / 4; data->dma.rxconf.src_maxburst = p->fifosize / 4;