From e724f271eea42c5d47c8418547407f90124b39f0 Mon Sep 17 00:00:00 2001 From: Gil Fine Date: Fri, 1 Mar 2024 15:11:18 +0200 Subject: [PATCH] thunderbolt: Avoid notify PM core about runtime PM resume commit dcd12acaf384c30437fa5a9a1f71df06fc9835fd upstream. Currently we notify PM core about occurred wakes after any resume. This is not actually needed after resume from runtime suspend. Hence, notify PM core about occurred wakes only after resume from system sleep. Also, if the wake occurred in USB4 router upstream port, we don't notify the PM core about it since it is not actually needed and can cause unexpected autowake (e.g. if /sys/power/wakeup_count is used). While there add the missing kernel-doc for tb_switch_resume(). Signed-off-by: Gil Fine Cc: stable@vger.kernel.org Signed-off-by: Mika Westerberg Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/switch.c | 27 +++++++++++++++++++++++++-- drivers/thunderbolt/tb.c | 4 ++-- drivers/thunderbolt/tb.h | 3 ++- drivers/thunderbolt/usb4.c | 13 +++++++------ 4 files changed, 36 insertions(+), 11 deletions(-) diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index fb7639cf5efb..66c81b3dc691 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -3441,7 +3441,26 @@ static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags) return tb_lc_set_wake(sw, flags); } -int tb_switch_resume(struct tb_switch *sw) +static void tb_switch_check_wakes(struct tb_switch *sw) +{ + if (device_may_wakeup(&sw->dev)) { + if (tb_switch_is_usb4(sw)) + usb4_switch_check_wakes(sw); + } +} + +/** + * tb_switch_resume() - Resume a switch after sleep + * @sw: Switch to resume + * @runtime: Is this resume from runtime suspend or system sleep + * + * Resumes and re-enumerates router (and all its children), if still plugged + * after suspend. Don't enumerate device router whose UID was changed during + * suspend. If this is resume from system sleep, notifies PM core about the + * wakes occurred during suspend. Disables all wakes, except USB4 wake of + * upstream port for USB4 routers that shall be always enabled. + */ +int tb_switch_resume(struct tb_switch *sw, bool runtime) { struct tb_port *port; int err; @@ -3490,6 +3509,9 @@ int tb_switch_resume(struct tb_switch *sw) if (err) return err; + if (!runtime) + tb_switch_check_wakes(sw); + /* Disable wakes */ tb_switch_set_wake(sw, 0); @@ -3519,7 +3541,8 @@ int tb_switch_resume(struct tb_switch *sw) */ if (tb_port_unlock(port)) tb_port_warn(port, "failed to unlock port\n"); - if (port->remote && tb_switch_resume(port->remote->sw)) { + if (port->remote && + tb_switch_resume(port->remote->sw, runtime)) { tb_port_warn(port, "lost during suspend, disconnecting\n"); tb_sw_set_unplugged(port->remote->sw); diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 3b01dd35ab0c..ef1000776f8a 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -2760,7 +2760,7 @@ static int tb_resume_noirq(struct tb *tb) /* remove any pci devices the firmware might have setup */ tb_switch_reset(tb->root_switch); - tb_switch_resume(tb->root_switch); + tb_switch_resume(tb->root_switch, false); tb_free_invalid_tunnels(tb); tb_free_unplugged_children(tb->root_switch); tb_restore_children(tb->root_switch); @@ -2886,7 +2886,7 @@ static int tb_runtime_resume(struct tb *tb) struct tb_tunnel *tunnel, *n; mutex_lock(&tb->lock); - tb_switch_resume(tb->root_switch); + tb_switch_resume(tb->root_switch, true); tb_free_invalid_tunnels(tb); tb_restore_children(tb->root_switch); list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 84c6716f5271..7706f8e08c8d 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -817,7 +817,7 @@ int tb_switch_configuration_valid(struct tb_switch *sw); int tb_switch_add(struct tb_switch *sw); void tb_switch_remove(struct tb_switch *sw); void tb_switch_suspend(struct tb_switch *sw, bool runtime); -int tb_switch_resume(struct tb_switch *sw); +int tb_switch_resume(struct tb_switch *sw, bool runtime); int tb_switch_reset(struct tb_switch *sw); int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit, u32 value, int timeout_msec); @@ -1278,6 +1278,7 @@ static inline bool tb_switch_is_usb4(const struct tb_switch *sw) return usb4_switch_version(sw) > 0; } +void usb4_switch_check_wakes(struct tb_switch *sw); int usb4_switch_setup(struct tb_switch *sw); int usb4_switch_configuration_valid(struct tb_switch *sw); int usb4_switch_read_uid(struct tb_switch *sw, u64 *uid); diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c index df58645071ea..a74c9ea67bf5 100644 --- a/drivers/thunderbolt/usb4.c +++ b/drivers/thunderbolt/usb4.c @@ -155,7 +155,13 @@ static inline int usb4_switch_op_data(struct tb_switch *sw, u16 opcode, tx_dwords, rx_data, rx_dwords); } -static void usb4_switch_check_wakes(struct tb_switch *sw) +/** + * usb4_switch_check_wakes() - Check for wakes and notify PM core about them + * @sw: Router whose wakes to check + * + * Checks wakes occurred during suspend and notify the PM core about them. + */ +void usb4_switch_check_wakes(struct tb_switch *sw) { bool wakeup_usb4 = false; struct usb4_port *usb4; @@ -163,9 +169,6 @@ static void usb4_switch_check_wakes(struct tb_switch *sw) bool wakeup = false; u32 val; - if (!device_may_wakeup(&sw->dev)) - return; - if (tb_route(sw)) { if (tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_6, 1)) return; @@ -244,8 +247,6 @@ int usb4_switch_setup(struct tb_switch *sw) u32 val = 0; int ret; - usb4_switch_check_wakes(sw); - if (!tb_route(sw)) return 0;