From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> commit 7a7ebfa85f4fac349f3ab219538c44efe18b0cf6 upstream. On zang's Dell XPS 13 9370 after Thunderbolt NVM firmware upgrade the Thunderbolt controller did not come back as expected. Only after the system was rebooted it became available again. It is not entirely clear what happened but I suspect the new NVM firmware image authentication failed for some reason. Regardless of this the router needs to be power cycled if NVM authentication fails in order to get it fully functional again. This modifies the driver to issue a power cycle in case the NVM authentication fails immediately when dma_port_flash_update_auth() returns. We also need to call tb_switch_set_uuid() earlier to be able to fetch possible NVM authentication failure when DMA port is added. Link: https://bugzilla.kernel.org/show_bug.cgi?id=205457 Reported-by: zang <dump@xxxxxxxx> Cc: stable <stable@xxxxxxxxxxxxxxx> Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/thunderbolt/switch.c | 54 +++++++++++++++++++++++++++++++++---------- 1 file changed, 42 insertions(+), 12 deletions(-) --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -167,7 +167,7 @@ static int nvm_validate_and_write(struct static int nvm_authenticate_host(struct tb_switch *sw) { - int ret; + int ret = 0; /* * Root switch NVM upgrade requires that we disconnect the @@ -175,6 +175,8 @@ static int nvm_authenticate_host(struct * already). */ if (!sw->safe_mode) { + u32 status; + ret = tb_domain_disconnect_all_paths(sw->tb); if (ret) return ret; @@ -183,7 +185,16 @@ static int nvm_authenticate_host(struct * everything goes well so getting timeout is expected. */ ret = dma_port_flash_update_auth(sw->dma_port); - return ret == -ETIMEDOUT ? 0 : ret; + if (!ret || ret == -ETIMEDOUT) + return 0; + + /* + * Any error from update auth operation requires power + * cycling of the host router. + */ + tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n"); + if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0) + nvm_set_auth_status(sw, status); } /* @@ -191,7 +202,7 @@ static int nvm_authenticate_host(struct * switch. */ dma_port_power_cycle(sw->dma_port); - return 0; + return ret; } static int nvm_authenticate_device(struct tb_switch *sw) @@ -199,8 +210,16 @@ static int nvm_authenticate_device(struc int ret, retries = 10; ret = dma_port_flash_update_auth(sw->dma_port); - if (ret && ret != -ETIMEDOUT) + switch (ret) { + case 0: + case -ETIMEDOUT: + case -EACCES: + case -EINVAL: + /* Power cycle is required */ + break; + default: return ret; + } /* * Poll here for the authentication status. It takes some time @@ -937,8 +956,6 @@ static ssize_t nvm_authenticate_store(st */ nvm_authenticate_start(sw); ret = nvm_authenticate_host(sw); - if (ret) - nvm_authenticate_complete(sw); } else { ret = nvm_authenticate_device(sw); } @@ -1332,13 +1349,16 @@ static int tb_switch_add_dma_port(struct int ret; switch (sw->generation) { - case 3: - break; - case 2: /* Only root switch can be upgraded */ if (tb_route(sw)) return 0; + + /* fallthrough */ + case 3: + ret = tb_switch_set_uuid(sw); + if (ret) + return ret; break; default: @@ -1359,6 +1379,19 @@ static int tb_switch_add_dma_port(struct return 0; /* + * If there is status already set then authentication failed + * when the dma_port_flash_update_auth() returned. Power cycling + * is not needed (it was done already) so only thing we do here + * is to unblock runtime PM of the root port. + */ + nvm_get_auth_status(sw, &status); + if (status) { + if (!tb_route(sw)) + nvm_authenticate_complete(sw); + return 0; + } + + /* * Check status of the previous flash authentication. If there * is one we need to power cycle the switch in any case to make * it functional again. @@ -1373,9 +1406,6 @@ static int tb_switch_add_dma_port(struct if (status) { tb_sw_info(sw, "switch flash authentication failed\n"); - ret = tb_switch_set_uuid(sw); - if (ret) - return ret; nvm_set_auth_status(sw, status); }
