5.15-stable review patch. If anyone has any objections, please let me know.
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From: William Breathitt Gray wbg@kernel.org
commit c0c9c73434666dc99ee156b25e7e722150bee001 upstream.
Hardware initialize of the timer counter channel does not occur on probe thus leaving the Count in an undefined state until the first function_write() callback is executed. Fix this by performing the proper hardware initialization during probe.
Fixes: 106b104137fd ("counter: Add microchip TCB capture counter") Reported-by: Csókás Bence csokas.bence@prolan.hu Closes: https://lore.kernel.org/all/bfa70e78-3cc3-4295-820b-3925c26135cb@prolan.hu/ Link: https://lore.kernel.org/r/20250305-preset-capture-mode-microchip-tcb-capture... Signed-off-by: William Breathitt Gray wbg@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/counter/microchip-tcb-capture.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
--- a/drivers/counter/microchip-tcb-capture.c +++ b/drivers/counter/microchip-tcb-capture.c @@ -370,6 +370,25 @@ static int mchp_tc_probe(struct platform channel); }
+ /* Disable Quadrature Decoder and position measure */ + ret = regmap_update_bits(regmap, ATMEL_TC_BMR, ATMEL_TC_QDEN | ATMEL_TC_POSEN, 0); + if (ret) + return ret; + + /* Setup the period capture mode */ + ret = regmap_update_bits(regmap, ATMEL_TC_REG(priv->channel[0], CMR), + ATMEL_TC_WAVE | ATMEL_TC_ABETRG | ATMEL_TC_CMR_MASK | + ATMEL_TC_TCCLKS, + ATMEL_TC_CMR_MASK); + if (ret) + return ret; + + /* Enable clock and trigger counter */ + ret = regmap_write(regmap, ATMEL_TC_REG(priv->channel[0], CCR), + ATMEL_TC_CLKEN | ATMEL_TC_SWTRG); + if (ret) + return ret; + priv->tc_cfg = tcb_config; priv->regmap = regmap; priv->counter.name = dev_name(&pdev->dev);