Re: [PATCH] backlight: qcom-wled: Fix unbalanced OVP IRQ enable at probe

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 9/8/26 10:53 PM, David Heidelberg via B4 Relay wrote:
> From: David Heidelberg <david@ixit.cz>
> 
> wled_configure_ovp_irq() derives the initial state of the OVP interrupt
> from the hardware:

[...]

> +	val = WLED_DEFAULT_BRIGHTNESS;
> +	of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
> +
> +	/*
> +	 * The module may already be enabled, either by a bootloader that left
> +	 * the backlight lit or by the setup above. Record that, so that the
> +	 * first brightness update does not enable an already enabled module,
> +	 * and so that the OVP irq is armed from probe rather than from that
> +	 * first update.
> +	 */
> +	rc = regmap_read(wled->regmap, wled->ctrl_addr + WLED3_CTRL_REG_MOD_EN,
> +			 &mod_en);
> +	if (rc < 0)
> +		return rc;
> +
> +	if (mod_en & WLED3_CTRL_REG_MOD_EN_MASK)
> +		wled->brightness = val;

This won't work for WLED5, you can implement backlight_ops.get_brightness()
and take advantage of having that function pointer

Otherwise I believe what this patch is good

Konrad