linux-kernel - Re: [PATCH v6] fbtft: add tearing signal detect

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Date:   Wed, 27 Jan 2021 11:59:51 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Carlis <zhangxuezhi3@...il.com>
Cc:     gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        linux-fbdev@...r.kernel.org, mh12gx2825@...il.com,
        oliver.graute@...oconnector.com, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, sbrivio@...hat.com,
        colin.king@...onical.com, zhangxuezhi1@...ong.com
Subject: Re: [PATCH v6] fbtft: add tearing signal detect

On Wed, Jan 27, 2021 at 03:28:22PM +0800, Carlis wrote:
>  static int init_display(struct fbtft_par *par)
>  {
> +	int rc;
> +	struct device *dev = par->info->device;
> +
> +	par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0, GPIOD_IN);
> +	if (IS_ERR(par->gpio.te)) {
> +		rc = PTR_ERR(par->gpio.te);
> +		pr_err("Failed to request te gpio: %d\n", rc);
> +		par->gpio.te = NULL;
> +	}
> +	if (par->gpio.te) {
> +		init_completion(&spi_panel_te);
> +		mutex_init(&te_mutex);
> +		rc = devm_request_irq(dev,
> +				      gpiod_to_irq(par->gpio.te),
> +				     spi_panel_te_handler, IRQF_TRIGGER_RISING,
> +				     "TE_GPIO", par);
> +		if (rc) {
> +			pr_err("TE request_irq failed.\n");
> +			devm_gpiod_put(dev, par->gpio.te);
> +			par->gpio.te = NULL;
> +		} else {
> +			disable_irq_nosync(gpiod_to_irq(par->gpio.te));
> +			pr_info("TE request_irq completion.\n");

#SadFaceEmoji

> +		}
> +	} else {
> +		pr_info("%s:%d, TE gpio not specified\n",
> +			__func__, __LINE__);
> +	}

regards,
dan carpenter