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Message-Id: <1576202909-1661-1-git-send-email-Anson.Huang@nxp.com>
Date: Fri, 13 Dec 2019 10:08:29 +0800
From: Anson Huang <Anson.Huang@....com>
To: dmitry.torokhov@...il.com, shawnguo@...nel.org,
s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
robh@...nel.org, linux-input@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Linux-imx@....com
Subject: [PATCH] input: keyboard: imx_sc_key: Only take the valid data from SCU firmware as key state
When reading key state from SCU, the response data from SCU firmware
is 4 bytes due to MU message protocol, but ONLY the first byte is the
key state, other 3 bytes could be some dirty data, so we should ONLY
take the first byte as key state to avoid reporting incorrect state.
Signed-off-by: Anson Huang <Anson.Huang@....com>
---
drivers/input/keyboard/imx_sc_key.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/input/keyboard/imx_sc_key.c b/drivers/input/keyboard/imx_sc_key.c
index 5379952..9f809ae 100644
--- a/drivers/input/keyboard/imx_sc_key.c
+++ b/drivers/input/keyboard/imx_sc_key.c
@@ -78,7 +78,13 @@ static void imx_sc_check_for_events(struct work_struct *work)
return;
}
- state = (bool)msg.state;
+ /*
+ * The response data from SCU firmware is 4 bytes,
+ * but ONLY the first byte is the key state, other
+ * 3 bytes could be some dirty data, so we should
+ * ONLY take the first byte as key state.
+ */
+ state = (bool)(msg.state & 0xff);
if (state ^ priv->keystate) {
priv->keystate = state;
--
2.7.4
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