diff options
Diffstat (limited to 'drivers/media/video/cx18/cx18-firmware.c')
| -rw-r--r-- | drivers/media/video/cx18/cx18-firmware.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/media/video/cx18/cx18-firmware.c b/drivers/media/video/cx18/cx18-firmware.c index ab02da72751..06f5563d6d5 100644 --- a/drivers/media/video/cx18/cx18-firmware.c +++ b/drivers/media/video/cx18/cx18-firmware.c @@ -380,6 +380,17 @@ int cx18_firmware_init(struct cx18 *cx) if (sz <= 0) return -EIO; } + + /* + * The CPU firmware apparently sets up to receive an interrupt for it's + * outgoing IRQ_CPU_TO_EPU_ACK to us (*boggle*). We get an interrupt + * when it sends us an ack, but by the time we process it, that flag in + * the SW2 status register has been cleared by the CPU firmware. + * We'll prevent that not so useful behavior by clearing the CPU's + * interrupt enables for Ack IRQ's we want to process. + */ + cx18_sw2_irq_disable_cpu(cx, IRQ_CPU_TO_EPU_ACK | IRQ_APU_TO_EPU_ACK); + /* initialize GPIO */ cx18_write_reg_expect(cx, 0x14001400, 0xc78110, 0x00001400, 0x14001400); return 0; |