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

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Date:   Wed, 27 Jan 2021 14:11:31 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Carlis <zhangxuezhi3@...il.com>
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, 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?

> +static struct mutex te_mutex;/*mutex for tearing line*/

Does that look correct???

thanks,

greg k-h