Input: iqs7222 - configure power mode before triggering ATI

If the device drops into ultra-low-power mode before being placed
into normal-power mode as part of ATI being triggered, the device
does not assert any interrupts until the ATI routine is restarted
two seconds later.

Solve this problem by adopting the vendor's recommendation, which
calls for the device to be placed into normal-power mode prior to
being configured and ATI being triggered.

The original implementation followed this sequence, but the order
was inadvertently changed as part of the resolution of a separate
erratum.

Fixes: 1e4189d8af27 ("Input: iqs7222 - protect volatile registers")
Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/ZKrpHc2Ji9qR25r2@nixie71
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/misc/iqs7222.c b/drivers/input/misc/iqs7222.c
index 096b0925f41bab10819c900e014708c1eca4c990..acb95048e8230ced659cee647323c667b52103ef 100644 (file)
--- a/drivers/input/misc/iqs7222.c
+++ b/drivers/input/misc/iqs7222.c
@@ -1381,9 +1381,6 @@ static int iqs7222_ati_trigger(struct iqs7222_private *iqs7222)
        if (error)
                return error;
 
-       sys_setup &= ~IQS7222_SYS_SETUP_INTF_MODE_MASK;
-       sys_setup &= ~IQS7222_SYS_SETUP_PWR_MODE_MASK;
-
        for (i = 0; i < IQS7222_NUM_RETRIES; i++) {
                /*
                 * Trigger ATI from streaming and normal-power modes so that
@@ -1561,8 +1558,11 @@ static int iqs7222_dev_init(struct iqs7222_private *iqs7222, int dir)
                        return error;
        }
 
-       if (dir == READ)
+       if (dir == READ) {
+               iqs7222->sys_setup[0] &= ~IQS7222_SYS_SETUP_INTF_MODE_MASK;
+               iqs7222->sys_setup[0] &= ~IQS7222_SYS_SETUP_PWR_MODE_MASK;
                return 0;
+       }
 
        return iqs7222_ati_trigger(iqs7222);
 }