Re: [RFC PATCH 1/4] drm/etnaviv: Prevent IRQ triggering at probe time on i.MX8MM

[Daniel Baluta <daniel.baluta@nxp.com>]

On 4/30/20 3:46 PM, Schrempf Frieder wrote:
>   
> +	/*
> +	 * On i.MX8MM there is an interrupt getting triggered immediately
> +	 * after requesting the IRQ, which leads to a stall as the handler
> +	 * accesses the GPU registers whithout the clock being enabled.
> +	 * Enabling the clocks briefly seems to clear the IRQ state, so we do
> +	 * this here before requesting the IRQ.
> +	 */
> +	err = etnaviv_gpu_clk_enable(gpu);
> +	if (err)
> +		return err;
> +
> +	err = etnaviv_gpu_clk_disable(gpu);
> +	if (err)
> +		return err;
> +
> +	err = devm_request_irq(&pdev->dev, gpu->irq, irq_handler, 0,
> +			       dev_name(gpu->dev), gpu);
> +	if (err) {
> +		dev_err(dev, "failed to request IRQ%u: %d\n", gpu->irq, err);
> +		return err;
> +	}

Shouldn't you disable the clk after devm_request_irq is called?