Re: [PATCH v2] pwm: tegra: Fix value discarding for duty and period

[Uwe Kleine-König]

Hello,

On Tue, Oct 20, 2026 at 03:39:38PM +0200, Uwe Kleine-König wrote:
> tegra_pwm_config() is called with u64 values passed for duty_ns and
> period_ns in tegra_pwm_apply(). Make these parameters u64 instead of int
> to not lose the upper bits for bigger values. If such a discard happens
> the values that are written to hardware become wrong, or (if the
> discarded period value becomes 0) a division by zero happens.
> 
> Adapt the math functions accordingly to not let the now potentially
> bigger values result in overflows. While touching these, also limit the
> scope of the required_clk_rate variable.
> 
> Reported-by: Sashiko <sashiko-bot@xxxxxxxxxx>
> Link: https://sashiko.dev/#/bug/linux-5c5b97d6-4da6-4d06-9dc7-957419dcd832
> Fixes: fd3ddd4355c0 ("pwm: tegra: Implement .apply() callback")
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxx>

pushed to

https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git pwm/for-nexxt

which I will rebase to v7.4-rc1 once that's available and then put in
my for-next branch as 7.5 material.

Best regards
Uwe

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