diff mbox series

[v14,07/17] HID: nintendo: send subcommands after receiving input report

Message ID 20210725032707.440071-8-djogorchock@gmail.com (mailing list archive)
State Superseded
Delegated to: Jiri Kosina
Headers show
Series HID: nintendo | expand

Commit Message

Daniel Ogorchock July 25, 2021, 3:26 a.m. UTC
Waiting to send subcommands until right after receiving an input report
drastically improves subcommand reliability. If the driver has finished
initial controller configuration, it now waits until receiving an input
report for all subcommands.

Signed-off-by: Daniel J. Ogorchock <djogorchock@gmail.com>
---
 drivers/hid/hid-nintendo.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
diff mbox series

Patch

diff --git a/drivers/hid/hid-nintendo.c b/drivers/hid/hid-nintendo.c
index 11f489c40678d..daa95fa8e9a0b 100644
--- a/drivers/hid/hid-nintendo.c
+++ b/drivers/hid/hid-nintendo.c
@@ -335,6 +335,7 @@  struct joycon_ctlr {
 	bool received_resp;
 	u8 usb_ack_match;
 	u8 subcmd_ack_match;
+	bool received_input_report;
 
 	/* factory calibration data */
 	struct joycon_stick_cal left_stick_cal_x;
@@ -388,6 +389,26 @@  static int joycon_hid_send_sync(struct joycon_ctlr *ctlr, u8 *data, size_t len,
 	 * doing one retry after a timeout appears to always work.
 	 */
 	while (tries--) {
+		/*
+		 * If we are in the proper reporting mode, wait for an input
+		 * report prior to sending the subcommand. This improves
+		 * reliability considerably.
+		 */
+		if (ctlr->ctlr_state == JOYCON_CTLR_STATE_READ) {
+			unsigned long flags;
+
+			spin_lock_irqsave(&ctlr->lock, flags);
+			ctlr->received_input_report = false;
+			spin_unlock_irqrestore(&ctlr->lock, flags);
+			ret = wait_event_timeout(ctlr->wait,
+						 ctlr->received_input_report,
+						 HZ / 4);
+			/* We will still proceed, even with a timeout here */
+			if (!ret)
+				hid_warn(ctlr->hdev,
+					 "timeout waiting for input report\n");
+		}
+
 		ret = __joycon_hid_send(ctlr->hdev, data, len);
 		if (ret < 0) {
 			memset(ctlr->input_buf, 0, JC_MAX_RESP_SIZE);
@@ -760,6 +781,18 @@  static void joycon_parse_report(struct joycon_ctlr *ctlr,
 	}
 
 	input_sync(dev);
+
+	/*
+	 * Immediately after receiving a report is the most reliable time to
+	 * send a subcommand to the controller. Wake any subcommand senders
+	 * waiting for a report.
+	 */
+	if (unlikely(mutex_is_locked(&ctlr->output_mutex))) {
+		spin_lock_irqsave(&ctlr->lock, flags);
+		ctlr->received_input_report = true;
+		spin_unlock_irqrestore(&ctlr->lock, flags);
+		wake_up(&ctlr->wait);
+	}
 }
 
 static void joycon_rumble_worker(struct work_struct *work)