Messages in this thread Patch in this message | | | From | Guiting Shen <> | Subject | [PATCH] pwm: atmel: enable clk when pwm already enabled in bootloader | Date | Mon, 10 Jul 2023 22:42:14 +0800 |
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The driver would never call clk_eanble() if the pwm channel already enable in bootloader which lead to dump the warning message of "the pwm clk already disabled" when poweroff the pwm channel.
Add atmel_pwm_enanle_clk_if_on() in probe function to enable clk if the pwm channel already enabled in bootloader.
Signed-off-by: Guiting Shen <aarongt.shen@gmail.com> --- drivers/pwm/pwm-atmel.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c index cdbc23649032..385f12eb604c 100644 --- a/drivers/pwm/pwm-atmel.c +++ b/drivers/pwm/pwm-atmel.c @@ -464,6 +464,29 @@ static const struct of_device_id atmel_pwm_dt_ids[] = { }; MODULE_DEVICE_TABLE(of, atmel_pwm_dt_ids); +static int atmel_pwm_enable_clk_if_on(struct atmel_pwm_chip *atmel_pwm) +{ + u32 sr, i; + int err; + + sr = atmel_pwm_readl(atmel_pwm, PWM_SR); + if (!sr) + return 0; + + for (i = 0; i < atmel_pwm->chip.npwm; i++) { + if (!(sr & (1 << i))) + continue; + + err = clk_enable(atmel_pwm->clk); + if (err) { + dev_err(atmel_pwm->chip.dev, "enable clock error\n"); + return err; + } + } + + return 0; +} + static int atmel_pwm_probe(struct platform_device *pdev) { struct atmel_pwm_chip *atmel_pwm; @@ -504,6 +527,10 @@ static int atmel_pwm_probe(struct platform_device *pdev) platform_set_drvdata(pdev, atmel_pwm); + ret = atmel_pwm_enable_clk_if_on(atmel_pwm); + if (ret < 0) + goto unprepare_clk; + return ret; unprepare_clk: -- 2.25.1
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