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/dma/hsu/pci.c | |
| parent | d03516df837587368fc6e75591f6329c072b9eb5 (diff) | |
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/dma/hsu/pci.c')
| -rw-r--r-- | drivers/dma/hsu/pci.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/dma/hsu/pci.c b/drivers/dma/hsu/pci.c index e2db76bd56d8..9916058531d9 100644 --- a/drivers/dma/hsu/pci.c +++ b/drivers/dma/hsu/pci.c @@ -27,13 +27,20 @@ static irqreturn_t hsu_pci_irq(int irq, void *dev) { struct hsu_dma_chip *chip = dev; u32 dmaisr; + u32 status; unsigned short i; irqreturn_t ret = IRQ_NONE; + int err; dmaisr = readl(chip->regs + HSU_PCI_DMAISR); for (i = 0; i < chip->hsu->nr_channels; i++) { - if (dmaisr & 0x1) - ret |= hsu_dma_irq(chip, i); + if (dmaisr & 0x1) { + err = hsu_dma_get_status(chip, i, &status); + if (err > 0) + ret |= IRQ_HANDLED; + else if (err == 0) + ret |= hsu_dma_do_irq(chip, i, status); + } dmaisr >>= 1; } |