diff options
Diffstat (limited to 'drivers/thunderbolt/dma_port.c')
| -rw-r--r-- | drivers/thunderbolt/dma_port.c | 28 |
1 files changed, 13 insertions, 15 deletions
diff --git a/drivers/thunderbolt/dma_port.c b/drivers/thunderbolt/dma_port.c index af6dde347bee..f2701194f810 100644 --- a/drivers/thunderbolt/dma_port.c +++ b/drivers/thunderbolt/dma_port.c @@ -170,24 +170,22 @@ static int dma_port_write(struct tb_ctl *ctl, const void *buffer, u64 route, static int dma_find_port(struct tb_switch *sw) { - int port, ret; - u32 type; + static const int ports[] = { 3, 5, 7 }; + int i; /* - * The DMA (NHI) port is either 3 or 5 depending on the - * controller. Try both starting from 5 which is more common. + * The DMA (NHI) port is either 3, 5 or 7 depending on the + * controller. Try all of them. */ - port = 5; - ret = dma_port_read(sw->tb->ctl, &type, tb_route(sw), port, 2, 1, - DMA_PORT_TIMEOUT); - if (!ret && (type & 0xffffff) == TB_TYPE_NHI) - return port; - - port = 3; - ret = dma_port_read(sw->tb->ctl, &type, tb_route(sw), port, 2, 1, - DMA_PORT_TIMEOUT); - if (!ret && (type & 0xffffff) == TB_TYPE_NHI) - return port; + for (i = 0; i < ARRAY_SIZE(ports); i++) { + u32 type; + int ret; + + ret = dma_port_read(sw->tb->ctl, &type, tb_route(sw), ports[i], + 2, 1, DMA_PORT_TIMEOUT); + if (!ret && (type & 0xffffff) == TB_TYPE_NHI) + return ports[i]; + } return -ENODEV; } |