Merge tag 'counter-fixes-for-6.1a' of git://git.kernel.org/pub/scm/li…

…nux/kernel/git/wbg/counter into char-misc-linus

William writes:
  "First set of Counter fixes for 6.1 cycle

   Typical driver fixes for races and bugs. This also includes a sparse
   warning fix for the recently introduced counter_array API: the macro
   DEFINE_COUNTER_ARRAY_POLARITY() is reduced to a simple structure
   definition rather than multiple data structure definitions.
   - 104-quad-8
     * Fix race getting function mode and direction
   - microchip-tcb-capture
     * Handle Signal1 read and Synapse
   - ti-ecap-capture
     * fix IS_ERR() vs NULL check
   - counter
     * Reduce DEFINE_COUNTER_ARRAY_POLARITY() to defining counter_array"

* tag 'counter-fixes-for-6.1a' of git://git.kernel.org/pub/scm/linux/kernel/git/wbg/counter:
  counter: 104-quad-8: Fix race getting function mode and direction
  counter: microchip-tcb-capture: Handle Signal1 read and Synapse
  counter: ti-ecap-capture: fix IS_ERR() vs NULL check
  counter: Reduce DEFINE_COUNTER_ARRAY_POLARITY() to defining counter_array

drivers/counter/104-quad-8.c

@@ -232,34 +232,45 @@ static const enum counter_function quad8_count_functions_list[] = {
 	COUNTER_FUNCTION_QUADRATURE_X4,
 };
 
+static int quad8_function_get(const struct quad8 *const priv, const size_t id,
+			      enum counter_function *const function)
+{
+	if (!priv->quadrature_mode[id]) {
+		*function = COUNTER_FUNCTION_PULSE_DIRECTION;
+		return 0;
+	}
+
+	switch (priv->quadrature_scale[id]) {
+	case 0:
+		*function = COUNTER_FUNCTION_QUADRATURE_X1_A;
+		return 0;
+	case 1:
+		*function = COUNTER_FUNCTION_QUADRATURE_X2_A;
+		return 0;
+	case 2:
+		*function = COUNTER_FUNCTION_QUADRATURE_X4;
+		return 0;
+	default:
+		/* should never reach this path */
+		return -EINVAL;
+	}
+}
+
 static int quad8_function_read(struct counter_device *counter,
 			       struct counter_count *count,
 			       enum counter_function *function)
 {
 	struct quad8 *const priv = counter_priv(counter);
-	const int id = count->id;
 	unsigned long irqflags;
+	int retval;
 
 	spin_lock_irqsave(&priv->lock, irqflags);
 
-	if (priv->quadrature_mode[id])
-		switch (priv->quadrature_scale[id]) {
-		case 0:
-			*function = COUNTER_FUNCTION_QUADRATURE_X1_A;
-			break;
-		case 1:
-			*function = COUNTER_FUNCTION_QUADRATURE_X2_A;
-			break;
-		case 2:
-			*function = COUNTER_FUNCTION_QUADRATURE_X4;
-			break;
-		}
-	else
-		*function = COUNTER_FUNCTION_PULSE_DIRECTION;
+	retval = quad8_function_get(priv, count->id, function);
 
 	spin_unlock_irqrestore(&priv->lock, irqflags);
 
-	return 0;
+	return retval;
 }
 
 static int quad8_function_write(struct counter_device *counter,
@@ -359,6 +370,7 @@ static int quad8_action_read(struct counter_device *counter,
 			     enum counter_synapse_action *action)
 {
 	struct quad8 *const priv = counter_priv(counter);
+	unsigned long irqflags;
 	int err;
 	enum counter_function function;
 	const size_t signal_a_id = count->synapses[0].signal->id;
@@ -374,9 +386,21 @@ static int quad8_action_read(struct counter_device *counter,
 		return 0;
 	}
 
-	err = quad8_function_read(counter, count, &function);
-	if (err)
+	spin_lock_irqsave(&priv->lock, irqflags);
+
+	/* Get Count function and direction atomically */
+	err = quad8_function_get(priv, count->id, &function);
+	if (err) {
+		spin_unlock_irqrestore(&priv->lock, irqflags);
+		return err;
+	}
+	err = quad8_direction_read(counter, count, &direction);
+	if (err) {
+		spin_unlock_irqrestore(&priv->lock, irqflags);
 		return err;
+	}
+
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	/* Default action mode */
 	*action = COUNTER_SYNAPSE_ACTION_NONE;
@@ -389,10 +413,6 @@ static int quad8_action_read(struct counter_device *counter,
 		return 0;
 	case COUNTER_FUNCTION_QUADRATURE_X1_A:
 		if (synapse->signal->id == signal_a_id) {
-			err = quad8_direction_read(counter, count, &direction);
-			if (err)
-				return err;
-
 			if (direction == COUNTER_COUNT_DIRECTION_FORWARD)
 				*action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
 			else

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) {

drivers/counter/ti-ecap-capture.c

@@ -377,7 +377,8 @@ static const enum counter_signal_polarity ecap_cnt_pol_avail[] = {
 	COUNTER_SIGNAL_POLARITY_NEGATIVE,
 };
 
-static DEFINE_COUNTER_ARRAY_POLARITY(ecap_cnt_pol_array, ecap_cnt_pol_avail, ECAP_NB_CEVT);
+static DEFINE_COUNTER_AVAILABLE(ecap_cnt_pol_available, ecap_cnt_pol_avail);
+static DEFINE_COUNTER_ARRAY_POLARITY(ecap_cnt_pol_array, ecap_cnt_pol_available, ECAP_NB_CEVT);
 
 static struct counter_comp ecap_cnt_signal_ext[] = {
 	COUNTER_COMP_ARRAY_POLARITY(ecap_cnt_pol_read, ecap_cnt_pol_write, ecap_cnt_pol_array),
@@ -479,8 +480,8 @@ static int ecap_cnt_probe(struct platform_device *pdev)
 	int ret;
 
 	counter_dev = devm_counter_alloc(dev, sizeof(*ecap_dev));
-	if (IS_ERR(counter_dev))
-		return PTR_ERR(counter_dev);
+	if (!counter_dev)
+		return -ENOMEM;
 
 	counter_dev->name = ECAP_DRV_NAME;
 	counter_dev->parent = dev;

include/linux/counter.h

@@ -542,11 +542,10 @@ struct counter_array {
 #define DEFINE_COUNTER_ARRAY_CAPTURE(_name, _length) \
 	DEFINE_COUNTER_ARRAY_U64(_name, _length)
 
-#define DEFINE_COUNTER_ARRAY_POLARITY(_name, _enums, _length) \
-	DEFINE_COUNTER_AVAILABLE(_name##_available, _enums); \
+#define DEFINE_COUNTER_ARRAY_POLARITY(_name, _available, _length) \
 	struct counter_array _name = { \
 		.type = COUNTER_COMP_SIGNAL_POLARITY, \
-		.avail = &(_name##_available), \
+		.avail = &(_available), \
 		.length = (_length), \
 	}