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pwm: stm32: Refuse too small period requests

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[ Upstream commit c45fcf46ca ]

If period_ns is small, prd might well become 0. Catch that case because
otherwise with

	regmap_write(priv->regmap, TIM_ARR, prd - 1);

a few lines down quite a big period is configured.

Fixes: 7edf736920 ("pwm: Add driver for STM32 plaftorm")
Cc: stable@vger.kernel.org
Reviewed-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/b86f62f099983646f97eeb6bfc0117bb2d0c340d.1718979150.git.u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Uwe Kleine-König
2024-06-21 16:37:12 +02:00
committed by Greg Kroah-Hartman
parent 44ac934505
commit 8176e43433
1 changed files with 2 additions and 0 deletions
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2
drivers/pwm/pwm-stm32.c
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@@ -337,6 +337,8 @@ static int stm32_pwm_config(struct stm32_pwm *priv, unsigned int ch,
prd = mul_u64_u64_div_u64(period_ns, clk_get_rate(priv->clk), prd = mul_u64_u64_div_u64(period_ns, clk_get_rate(priv->clk),
(u64)NSEC_PER_SEC * (prescaler + 1)); (u64)NSEC_PER_SEC * (prescaler + 1));
if (!prd)
return -EINVAL;
/* /*
* All channels share the same prescaler and counter so when two * All channels share the same prescaler and counter so when two