target/linux/pxa/patches-2.6.21/023-bugfix-serial-interrupt.patch

   1 Index: linux-2.6.21.7/drivers/serial/pxa.c
   2 ===================================================================
   3 --- linux-2.6.21.7.orig/drivers/serial/pxa.c
   4 +++ linux-2.6.21.7/drivers/serial/pxa.c
   5 @@ -235,15 +235,19 @@ static inline irqreturn_t serial_pxa_irq
   6         struct uart_pxa_port *up = dev_id;
   7         unsigned int iir, lsr;
   8
   9 +       serial_out(up, UART_MCR, serial_in(up, UART_MCR) & ~UART_MCR_RTS); // Clear RTS
  10         iir = serial_in(up, UART_IIR);
  11         if (iir & UART_IIR_NO_INT)
  12 -               return IRQ_NONE;
  13 +       {
  14 +               //printk(KERN_WARNING "serial_pxa_irq: odd -- interrupt triggered, but no interrupt in IIR: %08x\n",iir);
  15 +       }
  16         lsr = serial_in(up, UART_LSR);
  17         if (lsr & UART_LSR_DR)
  18                 receive_chars(up, &lsr);
  19         check_modem_status(up);
  20         if (lsr & UART_LSR_THRE)
  21                 transmit_chars(up);
  22 +       serial_out(up, UART_MCR, serial_in(up, UART_MCR) | UART_MCR_RTS); // Assert RTS
  23         return IRQ_HANDLED;
  24  }
  25