[PATCH v3 7/7] pwm: rockchip: Enable clock before calling clk_get_rate()

[Uwe Kleine-König]

On Wed, Dec 23, 2020 at 11:01:09AM -0500, Simon South wrote:
> The documentation for clk_get_rate() in include/linux/clk.h states the
> function's result is valid only for a clock source that has been
> enabled. However, the Rockchip PWM driver uses this function in two places
> to query the rate of a clock without first ensuring it is enabled.
> 
> Fix this by modifying rockchip_pwm_get_state() and rockchip_pwm_apply() so
> they enable a device's PWM clock before querying its rate (in the latter
> case, the querying is actually done in rockchip_pwm_config()) and disable
> the clock again before returning.
> 
> Reported-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
> Signed-off-by: Simon South <simon at simonsouth.net>

Reviewed-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |
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