diff options
| author | Chuah, Kim Tatt <kim.tatt.chuah@intel.com> | 2016-06-15 13:44:11 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-25 14:30:42 -0700 |
| commit | c6f82787a5a193a5c4c49ddaeb362d320efa5fba (patch) | |
| tree | 55da1b24d1b63bcb073e11ae49249887e297006e /drivers/tty/serial/8250/8250_mid.c | |
| parent | d03516df837587368fc6e75591f6329c072b9eb5 (diff) | |
| download | blackbird-op-linux-c6f82787a5a193a5c4c49ddaeb362d320efa5fba.tar.gz blackbird-op-linux-c6f82787a5a193a5c4c49ddaeb362d320efa5fba.zip | |
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/serial/8250/8250_mid.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_mid.c | 22 |
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; |
