diff options
| author | Muhammad Hamza Farooq <mfarooq@visteon.com> | 2015-09-18 13:08:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-04 17:36:10 +0100 |
| commit | 371cfed3116bc2ebd173fe55870f77ea1413edac (patch) | |
| tree | 773964dcdc299f474852d59cfe3e0fd1a71accbe | |
| parent | 9ab76556608665c35080f641c73025297d0a2813 (diff) | |
| download | lwn-371cfed3116bc2ebd173fe55870f77ea1413edac.tar.gz lwn-371cfed3116bc2ebd173fe55870f77ea1413edac.zip | |
serial: sh-sci: Redirect port interrupts to CPU _only_ when DMA stops
Since the DMA engine is not stopped everytime rx_timer_fn is called, the
interrupts have to be redirected back to CPU only when incomplete DMA
transaction is handled
Signed-off-by: Muhammad Hamza Farooq <mfarooq@visteon.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/sh-sci.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 36a11110acf4..5dcd8b382e90 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1285,12 +1285,6 @@ static void rx_timer_fn(unsigned long arg) spin_lock_irqsave(&port->lock, flags); dev_dbg(port->dev, "DMA Rx timed out\n"); - scr = serial_port_in(port, SCSCR); - if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { - scr &= ~SCSCR_RDRQE; - enable_irq(s->irqs[SCIx_RXI_IRQ]); - } - serial_port_out(port, SCSCR, scr | SCSCR_RIE); active = sci_dma_rx_find_active(s); if (active < 0) { @@ -1315,10 +1309,18 @@ static void rx_timer_fn(unsigned long arg) tty_flip_buffer_push(&port->state->port); } - spin_unlock_irqrestore(&port->lock, flags); - if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) sci_submit_rx(s); + + /* Direct new serial port interrupts back to CPU */ + scr = serial_port_in(port, SCSCR); + if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { + scr &= ~SCSCR_RDRQE; + enable_irq(s->irqs[SCIx_RXI_IRQ]); + } + serial_port_out(port, SCSCR, scr | SCSCR_RIE); + + spin_unlock_irqrestore(&port->lock, flags); } static void sci_request_dma(struct uart_port *port) |