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Thu, 28 May 2026 18:39:38 -0700 (PDT) Received: from lza-virtual-machine.localdomain ([120.236.174.211]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2bf239e7019sm721585ad.11.2026.05.28.18.39.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 May 2026 18:39:38 -0700 (PDT) From: Zhian Liang To: Dmitry Torokhov Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Zhian Liang Subject: [PATCH] Input: tca8418_keypad - enable overflow mode per datasheet (SCPS215G) Date: Fri, 29 May 2026 09:39:00 +0800 Message-Id: <20260529013900.43854-1-liangzhan5dev@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The driver currently sets only the overflow interrupt enable bit (OVR_FLOW_IEN) in the configuration register, leaving the overflow mode bit (OVR_FLOW_M) at its default value of 0. According to the TCA8418 datasheet (SCPS215G, Section 8.6.4.1 "Overflow Errata - Description"), both OVR_FLOW_M (Bit_5) and OVR_FLOW_IEN (Bit_3) must be set high for the overflow interrupt to be generated. If only OVR_FLOW_IEN is set, FIFO overflow events are silently lost without notifying the host. Fix this by setting OVR_FLOW_M alongside OVR_FLOW_IEN in the configuration register. Note: I do not have access to hardware to test this change. Testing by generating 11+ key events without reading the FIFO would be appreciated. Full handling of overflow events in the interrupt handler is left for future improvement. Signed-off-by: Zhian Liang --- drivers/input/keyboard/tca8418_keypad.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/input/keyboard/tca8418_keypad.c b/drivers/input/keyboa= rd/tca8418_keypad.c index 68c0afafee7b..b124e576feca 100644 --- a/drivers/input/keyboard/tca8418_keypad.c +++ b/drivers/input/keyboard/tca8418_keypad.c @@ -254,7 +254,7 @@ static int tca8418_configure(struct tca8418_keypad *key= pad_data, return error; =20 error =3D tca8418_write_byte(keypad_data, REG_CFG, - CFG_INT_CFG | CFG_OVR_FLOW_IEN | CFG_KE_IEN); + CFG_INT_CFG | CFG_OVR_FLOW_IEN | CFG_OVR_FLOW_M | CFG_KE_IEN); =20 return error; } --=20 2.34.1