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leds: rgb: leds-qcom-lpg: Fix calculation of best period Hi-Res PWMs

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When determining the actual best period by looping through all
possible PWM configs, the resolution currently used is based on
bit shift value which is off-by-one above the possible maximum
PWM value allowed.

So subtract one from the resolution before determining the best
period so that the maximum duty cycle requested by the PWM user
won't result in a value above the maximum allowed by the selected
resolution.

Cc: stable@vger.kernel.org    # 6.4
Fixes: b00d2ed37617 ("leds: rgb: leds-qcom-lpg: Add support for high resolution PWM")
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Sebastian Reichel <sre@kernel.org>
Link: https://lore.kernel.org/r/20250305-leds-qcom-lpg-fix-max-pwm-on-hi-res-v4-3-bfe124a53a9f@linaro.org
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Abel Vesa 2025-03-05 15:09:06 +02:00 committed by Lee Jones
parent b7881eacc0
commit 2528eec7da
1 changed files with 3 additions and 3 deletions
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6
drivers/leds/rgb/leds-qcom-lpg.c
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@ -462,7 +462,7 @@ static int lpg_calc_freq(struct lpg_channel *chan, uint64_t period)
max_res = LPG_RESOLUTION_9BIT;
}
min_period = div64_u64((u64)NSEC_PER_SEC * (1 << pwm_resolution_arr[0]),
min_period = div64_u64((u64)NSEC_PER_SEC * ((1 << pwm_resolution_arr[0]) - 1),
clk_rate_arr[clk_len - 1]);
if (period <= min_period)
return -EINVAL;
@ -483,7 +483,7 @@ static int lpg_calc_freq(struct lpg_channel *chan, uint64_t period)
*/
for (i = 0; i < pwm_resolution_count; i++) {
resolution = 1 << pwm_resolution_arr[i];
resolution = (1 << pwm_resolution_arr[i]) - 1;
for (clk_sel = 1; clk_sel < clk_len; clk_sel++) {
u64 numerator = period * clk_rate_arr[clk_sel];
@ -1292,7 +1292,7 @@ static int lpg_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
if (ret)
return ret;
state->period = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC * (1 << resolution) *
state->period = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC * ((1 << resolution) - 1) *
pre_div * (1 << m), refclk);
state->duty_cycle = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC * pwm_value * pre_div * (1 << m), refclk);
} else {