linux-kernel - [PATCH v2 3/9] thunderbolt: Populate PG field in hot plug acknowledgment packet

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Date:   Tue, 17 Dec 2019 15:33:39 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     linux-usb@...r.kernel.org
Cc:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Rajmohan Mani <rajmohan.mani@...el.com>,
        Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>,
        Lukas Wunner <lukas@...ner.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Mario.Limonciello@...l.com,
        Anthony Wong <anthony.wong@...onical.com>,
        Oliver Neukum <oneukum@...e.com>,
        Christian Kellner <ckellner@...hat.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/9] 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@...ux.intel.com>
---
 drivers/thunderbolt/ctl.c     | 19 +++++++++++++------
 drivers/thunderbolt/ctl.h     |  3 +--
 drivers/thunderbolt/tb.c      |  3 +--
 drivers/thunderbolt/tb_msgs.h |  6 +++++-
 4 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c
index d97813e80e5f..f77ceae5c7d7 100644
--- a/drivers/thunderbolt/ctl.c
+++ b/drivers/thunderbolt/ctl.c
@@ -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);
 }
 
diff --git a/drivers/thunderbolt/ctl.h b/drivers/thunderbolt/ctl.h
index 2f1a1e111110..97cb03b38953 100644
--- a/drivers/thunderbolt/ctl.h
+++ b/drivers/thunderbolt/ctl.h
@@ -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,
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 54085f67810a..e54d0d89a32d 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -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);
 	}
diff --git a/drivers/thunderbolt/tb_msgs.h b/drivers/thunderbolt/tb_msgs.h
index 3705057723b6..fc208c567953 100644
--- a/drivers/thunderbolt/tb_msgs.h
+++ b/drivers/thunderbolt/tb_msgs.h
@@ -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;
-- 
2.24.0