summaryrefslogtreecommitdiffstats
path: root/drivers/tty
diff options
context:
space:
mode:
authorChuah, Kim Tatt <kim.tatt.chuah@intel.com>2016-06-15 13:44:11 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-06-25 14:30:42 -0700
commitc6f82787a5a193a5c4c49ddaeb362d320efa5fba (patch)
tree55da1b24d1b63bcb073e11ae49249887e297006e /drivers/tty
parentd03516df837587368fc6e75591f6329c072b9eb5 (diff)
downloadlinux-c6f82787a5a193a5c4c49ddaeb362d320efa5fba.tar.bz2
dmaengine: hsu: Export hsu_dma_get_status()
To allow other code to safely read DMA Channel Status Register (where the register attribute for Channel Error, Descriptor Time Out & Descriptor Done fields are read-clear), export hsu_dma_get_status(). hsu_dma_irq() is renamed to hsu_dma_do_irq() and requires Status Register value to be passed in. Signed-off-by: Chuah, Kim Tatt <kim.tatt.chuah@intel.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/8250/8250_mid.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c
index 86379a79a6a3..b218ff528df7 100644
--- a/drivers/tty/serial/8250/8250_mid.c
+++ b/drivers/tty/serial/8250/8250_mid.c
@@ -97,12 +97,24 @@ static int dnv_handle_irq(struct uart_port *p)
{
struct mid8250 *mid = p->private_data;
unsigned int fisr = serial_port_in(p, INTEL_MID_UART_DNV_FISR);
+ u32 status;
int ret = IRQ_NONE;
-
- if (fisr & BIT(2))
- ret |= hsu_dma_irq(&mid->dma_chip, 1);
- if (fisr & BIT(1))
- ret |= hsu_dma_irq(&mid->dma_chip, 0);
+ int err;
+
+ if (fisr & BIT(2)) {
+ err = hsu_dma_get_status(&mid->dma_chip, 1, &status);
+ if (err > 0)
+ ret |= IRQ_HANDLED;
+ else if (err == 0)
+ ret |= hsu_dma_do_irq(&mid->dma_chip, 1, status);
+ }
+ if (fisr & BIT(1)) {
+ err = hsu_dma_get_status(&mid->dma_chip, 0, &status);
+ if (err > 0)
+ ret |= IRQ_HANDLED;
+ else if (err == 0)
+ ret |= hsu_dma_do_irq(&mid->dma_chip, 0, status);
+ }
if (fisr & BIT(0))
ret |= serial8250_handle_irq(p, serial_port_in(p, UART_IIR));
return ret;