On Wed, May 28, 2025 at 05:42:30PM +0200, Bram Vlerick wrote:
> Add devicetree parameter to enable or disable the invert feature of the
> ili9341 display

Can't/shouldn't this be done by userspace application? Why would someone
want to invert the color by default.

Also, this driver is built on top of the deprecated framebuffer, it will
never get out of staging/. For new feature, you probably want to send it to
drivers/gpu/drm/panel/panel-ilitek-ili9341.c instead.

> Signed-off-by: Bram Vlerick <bram.vler...@openpixelsystems.org>
> ---
>  drivers/staging/fbtft/fb_ili9341.c | 3 +++
>  drivers/staging/fbtft/fbtft-core.c | 2 ++
>  drivers/staging/fbtft/fbtft.h      | 3 +++
>  3 files changed, 8 insertions(+)
> 
> diff --git a/drivers/staging/fbtft/fb_ili9341.c 
> b/drivers/staging/fbtft/fb_ili9341.c
> index 
> 47e72b87d76d996111aaadcf5e56dfdfc1c331ab..a184f57df12b5ad6612a2e83b664a8911c7c79be
>  100644
> --- a/drivers/staging/fbtft/fb_ili9341.c
> +++ b/drivers/staging/fbtft/fb_ili9341.c
> @@ -103,6 +103,9 @@ static int set_var(struct fbtft_par *par)
>               break;
>       }
>  
> +     if (par->invert)
> +             write_reg(par, 0x21);

Use MIPI_DCS_ENTER_INVERT_MODE instead of the magic number.

Best regards,
Nam

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