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authorAnson Huang <Anson.Huang@nxp.com>2019-12-14 01:02:30 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2019-12-14 03:41:57 +0300
commit1021dcf19db1387bc0db26d14bbcba719923a466 (patch)
treeb1c3dd4f0ad5fdc0407e933e4055e109fbb58427 /drivers/input
parentcb222aed03d798fc074be55e59d9a112338ee784 (diff)
downloadlinux-1021dcf19db1387bc0db26d14bbcba719923a466.tar.xz
Input: 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@nxp.com> Fixes: 688f1dfb69b4 ("Input: keyboard - imx_sc: Add i.MX system controller key support") Link: https://lore.kernel.org/r/1576202909-1661-1-git-send-email-Anson.Huang@nxp.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/keyboard/imx_sc_key.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/input/keyboard/imx_sc_key.c b/drivers/input/keyboard/imx_sc_key.c
index 53799527dc75..9f809aeb785c 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;