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

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Date:   Wed, 27 Jan 2021 17:26:31 +0800
From:   carlis <zhangxuezhi3@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Colin King <colin.king@...onical.com>,
        oliver.graute@...oconnector.com, zhangxuezhi1@...ong.com,
        mh12gx2825@...il.com, Stefano Brivio <sbrivio@...hat.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        driverdevel <devel@...verdev.osuosl.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6] fbtft: add tearing signal detect

On Wed, 27 Jan 2021 10:00:13 +0100
Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> Hi Carlis,
> 
> On Wed, Jan 27, 2021 at 9:52 AM Carlis <zhangxuezhi3@...il.com> wrote:
> > From: zhangxuezhi <zhangxuezhi1@...ong.com>
> >
> > For st7789v ic,add tearing signal detect to avoid screen tearing
> >
> > Signed-off-by: zhangxuezhi <zhangxuezhi1@...ong.com>  
> 
> Thanks for your patch!
> 
> > --- a/drivers/staging/fbtft/fb_st7789v.c
> > +++ b/drivers/staging/fbtft/fb_st7789v.c  
> 
> > @@ -82,6 +111,34 @@ 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 (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;  
> 
> Errors (e.g. -EPROBE_DEFER) should be propagated upstream,
> not ignored.
> 
> > +       }
> > +       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;  
> 
> Errors (e.g. -EPROBE_DEFER) should be propagated upstream,
> not ignored.
> 
> > +               } else {
> > +
> > disable_irq_nosync(gpiod_to_irq(par->gpio.te));
> > +                       pr_info("TE request_irq completion.\n");
> > +               }
> > +       } else {
> > +               pr_info("%s:%d, TE gpio not specified\n",
> > +                       __func__, __LINE__);
> > +       }
> >         /* turn off sleep mode */
> >         write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
> >         mdelay(120);  
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 

hi,i will fix in the patch v7