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thunderbolt: Populate PG field in hot plug acknowledgment packet 

USB4 1.0 section 6.4.2.7 specifies a new field (PG) in notification
packet that is sent as response of hot plug/unplug events. This field
tells whether the acknowledgment is for plug or unplug event. This needs
to be set accordingly in order the router to send further hot plug
notifications.

To make it simpler we fill the field unconditionally. Legacy devices do
not look at this field so there should be no problems with them.

While there rename tb_cfg_error() to tb_cfg_ack_plug() and update the
log message accordingly. The function is only used to ack plug/unplug
events.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://lore.kernel.org/r/20191217123345.31850-4-mika.westerberg@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mika Westerberg 2019-12-17 15:33:39 +03:00 committed by Greg Kroah-Hartman
parent 4deb200d34
commit 210e9f56e9
4 changed files with 20 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/thunderbolt/ctl.c
View File

@ -708,19 +708,26 @@ void tb_ctl_stop(struct tb_ctl *ctl)
/* public interface, commands */
/**
* tb_cfg_error() - send error packet
* tb_cfg_ack_plug() - Ack hot plug/unplug event
* @ctl: Control channel to use
* @route: Router that originated the event
* @port: Port where the hot plug/unplug happened
* @unplug: Ack hot plug or unplug
*
* Return: Returns 0 on success or an error code on failure.
* Call this as response for hot plug/unplug event to ack it.
* Returns %0 on success or an error code on failure.
*/
int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port,
enum tb_cfg_error error)
int tb_cfg_ack_plug(struct tb_ctl *ctl, u64 route, u32 port, bool unplug)
{
struct cfg_error_pkg pkg = {
.header = tb_cfg_make_header(route),
.port = port,
.error = error,
.error = TB_CFG_ERROR_ACK_PLUG_EVENT,
.pg = unplug ? TB_CFG_ERROR_PG_HOT_UNPLUG
: TB_CFG_ERROR_PG_HOT_PLUG,
};
tb_ctl_dbg(ctl, "resetting error on %llx:%x.\n", route, port);
tb_ctl_dbg(ctl, "acking hot %splug event on %llx:%x\n",
unplug ? "un" : "", route, port);
return tb_ctl_tx(ctl, &pkg, sizeof(pkg), TB_CFG_PKG_ERROR);
}

3
drivers/thunderbolt/ctl.h
View File

@ -123,8 +123,7 @@ static inline struct tb_cfg_header tb_cfg_make_header(u64 route)
return header;
}
int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port,
enum tb_cfg_error error);
int tb_cfg_ack_plug(struct tb_ctl *ctl, u64 route, u32 port, bool unplug);
struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route,
int timeout_msec);
struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer,

3
drivers/thunderbolt/tb.c
View File

@ -768,8 +768,7 @@ static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type,
route = tb_cfg_get_route(&pkg->header);
if (tb_cfg_error(tb->ctl, route, pkg->port,
TB_CFG_ERROR_ACK_PLUG_EVENT)) {
if (tb_cfg_ack_plug(tb->ctl, route, pkg->port, pkg->unplug)) {
tb_warn(tb, "could not ack plug event on %llx:%x\n", route,
pkg->port);
}

6
drivers/thunderbolt/tb_msgs.h
View File

@ -67,9 +67,13 @@ struct cfg_error_pkg {
u32 zero1:4;
u32 port:6;
u32 zero2:2; /* Both should be zero, still they are different fields. */
u32 zero3:16;
u32 zero3:14;
u32 pg:2;
} __packed;
#define TB_CFG_ERROR_PG_HOT_PLUG 0x2
#define TB_CFG_ERROR_PG_HOT_UNPLUG 0x3
/* TB_CFG_PKG_EVENT */
struct cfg_event_pkg {
struct tb_cfg_header header;