On Mon, Oct 10, 2022 at 11:00:46AM +0100, Jon Hunter wrote:
> Commit 8c193f4714df ("pwm: tegra: Optimize period calculation") updated
> the period calculation in the Tegra PWM driver and now returns an error
> if the period requested is less than minimum period supported. This is
> breaking PWM support on various Tegra platforms. For example, on the
> Tegra210 Jetson Nano platform this is breaking the PWM fan support and
> probing the PWM fan driver now fails ...
>
> pwm-fan pwm-fan: Failed to configure PWM: -22
> pwm-fan: probe of pwm-fan failed with error -22
>
> The problem is that the default parent clock for the PWM on Tegra210 is
> a 32kHz clock and is unable to support the requested PWM period.
>
> Fix PWM support on Tegra20, Tegra30, Tegra114, Tegra124 and Tegra210 by
> updating the parent clock for the PWM to be the PLL_P.
>
> Fixes: 8c193f4714df ("pwm: tegra: Optimize period calculation")
> Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> Tested-by: Robert Eckelmann <longnoserob@xxxxxxxxx> # TF101 T20
> Tested-by: Antoni Aloy Torrens <aaloytorrens@xxxxxxxxx> # TF101 T20
> Tested-by: Svyatoslav Ryhel <clamor95@xxxxxxxxx> # TF201 T30
> Tested-by: Andreas Westman Dorcsak <hedmoo@xxxxxxxxx> # TF700T T3
Acked-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Thanks for your work on this!
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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