linux-kernel - Re: [PATCH v9] staging: fbtft: add tearing signal detect

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Message-ID: <20210127214433.00005c15@gmail.com>
Date:   Wed, 27 Jan 2021 21:44:33 +0800
From:   carlis <zhangxuezhi3@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     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 v9] staging: fbtft: add tearing signal detect

On Wed, 27 Jan 2021 14:11:31 +0100
Greg KH <gregkh@...uxfoundation.org> wrote:

> On Wed, Jan 27, 2021 at 08:57:37PM +0800, Carlis wrote:
> > From: zhangxuezhi <zhangxuezhi1@...ong.com>
> > 
> > For st7789v ic,add tearing signal detect to avoid screen tearing  
> 
> I need a much better changelog description here please.
> 
> > 
> > Signed-off-by: zhangxuezhi <zhangxuezhi1@...ong.com>
> > ---
> > v9: change pr_* to dev_*
> > ---  
> 
> What changed in all of your previous versions?  All of them should be
> listed here, right?
> 
> 
> 
> >  drivers/staging/fbtft/fb_st7789v.c | 132
> > ++++++++++++++++++++++++++++++++++++- drivers/staging/fbtft/fbtft.h
> >      |   1 + 2 files changed, 132 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/staging/fbtft/fb_st7789v.c
> > b/drivers/staging/fbtft/fb_st7789v.c index 3a280cc..9aa2f36 100644
> > --- a/drivers/staging/fbtft/fb_st7789v.c
> > +++ b/drivers/staging/fbtft/fb_st7789v.c
> > @@ -9,9 +9,12 @@
> >  #include <linux/delay.h>
> >  #include <linux/init.h>
> >  #include <linux/kernel.h>
> > +#include <linux/mutex.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/completion.h>
> >  #include <linux/module.h>
> >  #include <video/mipi_display.h>
> > -
> > +#include <linux/gpio/consumer.h>
> >  #include "fbtft.h"
> >  
> >  #define DRVNAME "fb_st7789v"
> > @@ -66,6 +69,32 @@ enum st7789v_command {
> >  #define MADCTL_MX BIT(6) /* bitmask for column address order */
> >  #define MADCTL_MY BIT(7) /* bitmask for page address order */
> >  
> > +#define SPI_PANEL_TE_TIMEOUT	400  
> 
> What is the units here?  Where did this value come from?

hi,the units is msecs,and i got this value from a qcom mdp spi
drivers,and i will add the notes you need in the patch v10
> 
> > +static struct mutex te_mutex;/*mutex for tearing line*/  
> 
> Does that look correct???
> 
> thanks,
> 
> greg k-h