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Commit 5c4e472b authored by Aubrey Li's avatar Aubrey Li Committed by Linus Torvalds
Browse files

Blackfin serial driver: fix overhead issue 



Signed-off-by: default avatarAubrey Li <aubrey.li@analog.com>
Signed-off-by: default avatarBryan Wu <bryan.wu@analog.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9d7b6677

drivers/serial/bfin_5xx.c

+17 −11
Original line number Original line Diff line number Diff line
@@ -240,24 +240,30 @@ static void bfin_serial_tx_chars(struct bfin_serial_port *uart) 
		bfin_serial_stop_tx(&uart->port);

		bfin_serial_stop_tx(&uart->port);

}

}





static irqreturn_t bfin_serial_int(int irq, void *dev_id)

static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)

{

	struct bfin_serial_port *uart = dev_id;



	spin_lock(&uart->port.lock);

	while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_RX_READY)

		bfin_serial_rx_chars(uart);

	spin_unlock(&uart->port.lock);

	return IRQ_HANDLED;

}



static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)

{

{

	struct bfin_serial_port *uart = dev_id;

	struct bfin_serial_port *uart = dev_id;

	unsigned short status;

	unsigned short status;





	spin_lock(&uart->port.lock);

	spin_lock(&uart->port.lock);

	status = UART_GET_IIR(uart);

	while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_TX_READY)

	do {

		if ((status & IIR_STATUS) == IIR_TX_READY)

		bfin_serial_tx_chars(uart);

		bfin_serial_tx_chars(uart);

		if ((status & IIR_STATUS) == IIR_RX_READY)

			bfin_serial_rx_chars(uart);

		status = UART_GET_IIR(uart);

	} while (status & (IIR_TX_READY | IIR_RX_READY));

	spin_unlock(&uart->port.lock);

	spin_unlock(&uart->port.lock);

	return IRQ_HANDLED;

	return IRQ_HANDLED;

}

}







static void bfin_serial_do_work(struct work_struct *work)

static void bfin_serial_do_work(struct work_struct *work)

{

{

	struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);

	struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
@@ -545,14 +551,14 @@ static int bfin_serial_startup(struct uart_port *port) 
	add_timer(&(uart->rx_dma_timer));

	add_timer(&(uart->rx_dma_timer));

#else

#else

	if (request_irq

	if (request_irq

	    (uart->port.irq, bfin_serial_int, IRQF_DISABLED,

	    (uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,

	     "BFIN_UART_RX", uart)) {

	     "BFIN_UART_RX", uart)) {

		printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");

		printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");

		return -EBUSY;

		return -EBUSY;

	}

	}





	if (request_irq

	if (request_irq

	    (uart->port.irq+1, bfin_serial_int, IRQF_DISABLED,

	    (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,

	     "BFIN_UART_TX", uart)) {

	     "BFIN_UART_TX", uart)) {

		printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");

		printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");

		free_irq(uart->port.irq, uart);

		free_irq(uart->port.irq, uart);