From d917a62af81b133f35f627e7936e193c842a7947 Mon Sep 17 00:00:00 2001 From: William Breathitt Gray Date: Tue, 18 Oct 2022 08:10:14 -0400 Subject: [PATCH] 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 Link: https://lore.kernel.org/r/20221018121014.7368-1-william.gray@linaro.org/ Signed-off-by: William Breathitt Gray --- drivers/counter/microchip-tcb-capture.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c index f9dee15d97776..e2d1dc6ca6682 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) {