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serial: 8250_mid: recognize interrupt source in handler

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There is a special register that shows interrupt status by source. In
particular case the source can be a combination of DMA Tx, DMA Rx, and UART.

Read the register and call the handlers only for sources that request an
interrupt.

Fixes: 6ede6dcd87 ("serial: 8250_mid: add support for DMA engine handling from UART MMIO")
Cc: stable@vger.kernel.org
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2016-04-04 17:35:10 +03:00 committed by Greg Kroah-Hartman
parent 107e15fc1f
commit c42850f1ae
1 changed files with 10 additions and 9 deletions
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19
drivers/tty/serial/8250/8250_mid.c
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@ -25,6 +25,7 @@
#define PCI_DEVICE_ID_INTEL_DNV_UART 0x19d8
/* Intel MID Specific registers */
#define INTEL_MID_UART_DNV_FISR 0x08
#define INTEL_MID_UART_PS 0x30
#define INTEL_MID_UART_MUL 0x34
#define INTEL_MID_UART_DIV 0x38
@ -90,16 +91,16 @@ static int tng_setup(struct mid8250 *mid, struct uart_port *p)
static int dnv_handle_irq(struct uart_port *p)
{
struct mid8250 *mid = p->private_data;
int ret;
unsigned int fisr = serial_port_in(p, INTEL_MID_UART_DNV_FISR);
int ret = IRQ_NONE;
ret = hsu_dma_irq(&mid->dma_chip, 0);
ret |= hsu_dma_irq(&mid->dma_chip, 1);
/* For now, letting the HW generate separate interrupt for the UART */
if (ret)
return ret;
return serial8250_handle_irq(p, serial_port_in(p, UART_IIR));
if (fisr & BIT(2))
ret |= hsu_dma_irq(&mid->dma_chip, 1);
if (fisr & BIT(1))
ret |= hsu_dma_irq(&mid->dma_chip, 0);
if (fisr & BIT(0))
ret |= serial8250_handle_irq(p, serial_port_in(p, UART_IIR));
return ret;
}
#define DNV_DMA_CHAN_OFFSET 0x80