linux-kernel - [PATCH] Hid: Intel-thc-hid: Intel-quickspi: switch first interrupt from level to edge detection

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Message-Id: <20250919070939.223954-1-even.xu@intel.com>
Date: Fri, 19 Sep 2025 15:09:39 +0800
From: Even Xu <even.xu@...el.com>
To: jikos@...nel.org,
	bentiss@...nel.org,
	srinivas.pandruvada@...ux.intel.com
Cc: linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Even Xu <even.xu@...el.com>,
	Rui Zhang <rui1.zhang@...el.com>
Subject: [PATCH] Hid: Intel-thc-hid: Intel-quickspi: switch first interrupt from level to edge detection

The original implementation used level detection for the first interrupt
after device reset to avoid potential interrupt line noise and missed
interrupts during the initialization phase. However, this approach
introduced unintended side effects when tested with certain touch panels,
including:
 - Delayed hardware interrupt response
 - Multiple spurious interrupt triggers

Switching back to edge detection for the first interrupt resolves these
issues while maintaining reliable interrupt handling.

Extensive testing across multiple platforms with touch panels from
various vendors confirms this change introduces no regressions.

Fixes: 9d8d51735a3a ("HID: intel-thc-hid: intel-quickspi: Add HIDSPI protocol implementation")
Tested-by: Rui Zhang <rui1.zhang@...el.com>
Signed-off-by: Even Xu <even.xu@...el.com>
---
 drivers/hid/intel-thc-hid/intel-quickspi/quickspi-protocol.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-protocol.c b/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-protocol.c
index e6ba2ddcc9cb..16f780bc879b 100644
--- a/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-protocol.c
+++ b/drivers/hid/intel-thc-hid/intel-quickspi/quickspi-protocol.c
@@ -280,8 +280,7 @@ int reset_tic(struct quickspi_device *qsdev)
 
 	qsdev->reset_ack = false;
 
-	/* First interrupt uses level trigger to avoid missing interrupt */
-	thc_int_trigger_type_select(qsdev->thc_hw, false);
+	thc_int_trigger_type_select(qsdev->thc_hw, true);
 
 	ret = acpi_tic_reset(qsdev);
 	if (ret)
-- 
2.40.1