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pwm: imx: Don't drop the enable bit once set

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Changing the duty-cycle should not blindly override (and clear) the
enable (EN) bit if it has already been set. For instance, a PWM
backlight can be enabled and set to a specific intensity using two
operations. The order of these operations should not matter.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
This commit is contained in:
Miquel Raynal 2024-09-10 11:13:59 +02:00 • committed by Fabio Estevam
parent 4aea3110ab
commit 5748aa1e37
1 changed files with 3 additions and 2 deletions
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5
drivers/pwm/pwm-imx.c
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@ -20,10 +20,11 @@ int pwm_config_internal(struct pwm_regs *pwm, unsigned long period_cycles,
u32 cr; u32 cr;
writel(0, &pwm->ir); writel(0, &pwm->ir);
cr = PWMCR_PRESCALER(prescale) |
cr = readl(&pwm->cr) & PWMCR_EN;
cr |= PWMCR_PRESCALER(prescale) |
PWMCR_DOZEEN | PWMCR_WAITEN | PWMCR_DOZEEN | PWMCR_WAITEN |
PWMCR_DBGEN | PWMCR_CLKSRC_IPG_HIGH; PWMCR_DBGEN | PWMCR_CLKSRC_IPG_HIGH;
writel(cr, &pwm->cr); writel(cr, &pwm->cr);
/* set duty cycles */ /* set duty cycles */
writel(duty_cycles, &pwm->sar); writel(duty_cycles, &pwm->sar);