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Commit 5181fb3d authored by Tomoya MORINAGA's avatar Tomoya MORINAGA Committed by Greg Kroah-Hartman
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pch_uart: Support modem status interrupt 



Signed-off-by: default avatarTomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b23954a3

drivers/tty/serial/pch_uart.c

+13 −2
Original line number Diff line number Diff line
@@ -1043,10 +1043,15 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id) 
	int ret = 0;

	unsigned char iid;

	unsigned long flags;

	int next = 1;

	u8 msr;



	spin_lock_irqsave(&priv->port.lock, flags);

	handled = 0;

	while ((iid = pch_uart_hal_get_iid(priv)) > 1) {

	while (next) {

		iid = pch_uart_hal_get_iid(priv);

		if (iid & PCH_UART_IIR_IP) /* No Interrupt */

			break;

		switch (iid) {

		case PCH_UART_IID_RLS:	/* Receiver Line Status */

			lsr = pch_uart_hal_get_line_status(priv);
@@ -1080,12 +1085,18 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id) 
				ret = handle_tx(priv);

			break;

		case PCH_UART_IID_MS:	/* Modem Status */

			ret = PCH_UART_HANDLED_MS_INT;

			msr = pch_uart_hal_get_modem(priv);

			next = 0; /* MS ir prioirty is the lowest. So, MS ir

				     means final interrupt */

			if ((msr & UART_MSR_ANY_DELTA) == 0)

				break;

			ret |= PCH_UART_HANDLED_MS_INT;

			break;

		default:	/* Never junp to this label */

			dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__,

				iid, jiffies);

			ret = -1;

			next = 0;

			break;

		}

		handled |= (unsigned int)ret;