counter: microchip-tcb-capture: Handle Signal1 read and Synapse

The signal_read(), action_read(), and action_write() callbacks have been
assuming Signal0 is requested without checking. This results in requests
for Signal1 returning data for Signal0. This patch fixes these
oversights by properly checking for the Signal's id in the respective
callbacks and handling accordingly based on the particular Signal
requested. The trig_inverted member of the mchp_tc_data is removed as
superfluous.

Fixes: 106b104137fd ("counter: Add microchip TCB capture counter")
Cc: stable@vger.kernel.org
Reviewed-by: Kamel Bouhara <kamel.bouhara@bootlin.com>
Link: https://lore.kernel.org/r/20221018121014.7368-1-william.gray@linaro.org/
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>

diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c
index f9dee15d9777631a24ac3a7a6a8e34c295b11fcd..e2d1dc6ca6682f4fc9a11cf0120f5b6548e60393 100644 (file)
--- a/drivers/counter/microchip-tcb-capture.c
+++ b/drivers/counter/microchip-tcb-capture.c
@@ -28,7 +28,6 @@ struct mchp_tc_data {
        int qdec_mode;
        int num_channels;
        int channel[2];
-       bool trig_inverted;
 };
 
 static const enum counter_function mchp_tc_count_functions[] = {
@@ -153,7 +152,7 @@ static int mchp_tc_count_signal_read(struct counter_device *counter,
 
        regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], SR), &sr);
 
-       if (priv->trig_inverted)
+       if (signal->id == 1)
                sigstatus = (sr & ATMEL_TC_MTIOB);
        else
                sigstatus = (sr & ATMEL_TC_MTIOA);
@@ -171,6 +170,17 @@ static int mchp_tc_count_action_read(struct counter_device *counter,
        struct mchp_tc_data *const priv = counter_priv(counter);
        u32 cmr;
 
+       if (priv->qdec_mode) {
+               *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
+               return 0;
+       }
+
+       /* Only TIOA signal is evaluated in non-QDEC mode */
+       if (synapse->signal->id != 0) {
+               *action = COUNTER_SYNAPSE_ACTION_NONE;
+               return 0;
+       }
+
        regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), &cmr);
 
        switch (cmr & ATMEL_TC_ETRGEDG) {
@@ -199,8 +209,8 @@ static int mchp_tc_count_action_write(struct counter_device *counter,
        struct mchp_tc_data *const priv = counter_priv(counter);
        u32 edge = ATMEL_TC_ETRGEDG_NONE;
 
-       /* QDEC mode is rising edge only */
-       if (priv->qdec_mode)
+       /* QDEC mode is rising edge only; only TIOA handled in non-QDEC mode */
+       if (priv->qdec_mode || synapse->signal->id != 0)
                return -EINVAL;
 
        switch (action) {