diff mbox series

[v2] counter: microchip-tcb-capture: Handle Signal1 read and Synapse

Message ID 20221018121014.7368-1-william.gray@linaro.org (mailing list archive)
State New, archived
Headers show
Series [v2] counter: microchip-tcb-capture: Handle Signal1 read and Synapse | expand

Commit Message

William Breathitt Gray Oct. 18, 2022, 12:10 p.m. UTC 
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
Cc: Kamel Bouhara <kamel.bouhara@bootlin.com>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
---
Changes in v2:
 - Simplified action_read() changes to just handle qdec_mode and
   non-TIOA Signals before continuing with existing code

 drivers/counter/microchip-tcb-capture.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

Comments

William Breathitt Gray Oct. 22, 2022, 3:11 p.m. UTC | #1 
On Tue, Oct 18, 2022 at 08:10:14AM -0400, William Breathitt Gray wrote:
> 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
> Cc: Kamel Bouhara <kamel.bouhara@bootlin.com>
> Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
> ---
> Changes in v2:
>  - Simplified action_read() changes to just handle qdec_mode and
>    non-TIOA Signals before continuing with existing code

Queued for counter-fixes.

William Breathitt Gray
diff mbox series

Patch

diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c
index f9dee15d9777..e2d1dc6ca668 100644
--- 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) {