diff options
Diffstat (limited to 'drivers/thunderbolt/switch.c')
| -rw-r--r-- | drivers/thunderbolt/switch.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 6384061100b0..4b47e0999cda 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -377,6 +377,8 @@ static void tb_switch_release(struct device *dev) { struct tb_switch *sw = tb_to_switch(dev); + dma_port_free(sw->dma_port); + kfree(sw->uuid); kfree(sw->device_name); kfree(sw->vendor_name); @@ -570,6 +572,25 @@ static void tb_switch_set_uuid(struct tb_switch *sw) sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL); } +static void tb_switch_add_dma_port(struct tb_switch *sw) +{ + switch (sw->generation) { + case 3: + break; + + case 2: + /* Only root switch can be upgraded */ + if (tb_route(sw)) + return; + break; + + default: + return; + } + + sw->dma_port = dma_port_alloc(sw); +} + /** * tb_switch_add() - Add a switch to the domain * @sw: Switch to add @@ -586,6 +607,15 @@ int tb_switch_add(struct tb_switch *sw) { int i, ret; + /* + * Initialize DMA control port now before we read DROM. Recent + * host controllers have more complete DROM on NVM that includes + * vendor and model identification strings which we then expose + * to the userspace. NVM can be accessed through DMA + * configuration based mailbox. + */ + tb_switch_add_dma_port(sw); + /* read drom */ ret = tb_drom_read(sw); if (ret) { |