linux-kernel - Re: [PATCH v4] fbtft: add tearing signal detect

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Date:   Wed, 27 Jan 2021 09:15:49 +0800
From:   carlis <zhangxuezhi3@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.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 v4] fbtft: add tearing signal detect

On Tue, 26 Jan 2021 20:51:41 +0300
Dan Carpenter <dan.carpenter@...cle.com> wrote:

> On Tue, Jan 26, 2021 at 08:40:35PM +0800, Carlis wrote:
> > @@ -82,6 +111,29 @@ enum st7789v_command {
> >   */
> >  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 (par->gpio.te) {  
> 
> I explained in my earlier review that devm_gpiod_get_index_optional()
> can return error pointers...  There was quite a bit of detail about
> how to handle this correctly in my earlier review, but I think you
> might not have noticed it.  Please read it again.
> 
> > +		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");
> > +		}
> > +	} else {
> > +		pr_err("%s:%d, TE gpio not specified\n",
> > +		       __func__, __LINE__);
> > +	}  
> 
> regards,
> dan carpenter
> 
Thank you for your correction,i will change pr_err to pr_info in next
patch v5

regards,
dan carpenter