linux-kernel - Re: [PATCH] video: fbdev: ssd1307fb: Added support to Column offset

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Message-ID: <CAMuHMdX5-cYdK0UrNYj+wRuUu3whADaq607OuBjALnnKWi5FCQ@mail.gmail.com>
Date:   Wed, 13 May 2020 15:45:41 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Rodrigo Rolim Mendes de Alencar <455.rodrigo.alencar@...il.com>
Cc:     Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        alencar.fmce@...el.gov.br,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH] video: fbdev: ssd1307fb: Added support to Column offset

CC dt

On Wed, May 13, 2020 at 1:52 PM Rodrigo Rolim Mendes de Alencar
<455.rodrigo.alencar@...il.com> wrote:
> This patch provides support for displays like VGM128064B0W10,
> which requires a column offset of 2, i.e., its segments starts
> in SEG2 and ends in SEG129.
>
> Signed-off-by: Rodrigo Alencar <455.rodrigo.alencar@...il.com>
> ---
>  Documentation/devicetree/bindings/display/ssd1307fb.txt | 1 +
>  drivers/video/fbdev/ssd1307fb.c                         | 8 ++++++--
>  2 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/display/ssd1307fb.txt b/Documentation/devicetree/bindings/display/ssd1307fb.txt
> index 27333b9551b3..a9b51fd724a9 100644
> --- a/Documentation/devicetree/bindings/display/ssd1307fb.txt
> +++ b/Documentation/devicetree/bindings/display/ssd1307fb.txt
> @@ -19,6 +19,7 @@ Optional properties:
>    - vbat-supply: The supply for VBAT
>    - solomon,segment-no-remap: Display needs normal (non-inverted) data column
>                                to segment mapping
> +  - solomon,col-offset: Offset of columns (SEG) that the screen is mapped to.
>    - solomon,com-seq: Display uses sequential COM pin configuration
>    - solomon,com-lrremap: Display uses left-right COM pin remap
>    - solomon,com-invdir: Display uses inverted COM pin scan direction
> diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
> index 8e06ba912d60..0241585bfbcc 100644
> --- a/drivers/video/fbdev/ssd1307fb.c
> +++ b/drivers/video/fbdev/ssd1307fb.c
> @@ -74,6 +74,7 @@ struct ssd1307fb_par {
>         struct fb_info *info;
>         u8 lookup_table[4];
>         u32 page_offset;
> +       u32 col_offset;
>         u32 prechargep1;
>         u32 prechargep2;
>         struct pwm_device *pwm;
> @@ -458,11 +459,11 @@ static int ssd1307fb_init(struct ssd1307fb_par *par)
>         if (ret < 0)
>                 return ret;
>
> -       ret = ssd1307fb_write_cmd(par->client, 0x0);
> +       ret = ssd1307fb_write_cmd(par->client, par->col_offset);
>         if (ret < 0)
>                 return ret;
>
> -       ret = ssd1307fb_write_cmd(par->client, par->width - 1);
> +       ret = ssd1307fb_write_cmd(par->client, par->col_offset + par->width - 1);
>         if (ret < 0)
>                 return ret;
>
> @@ -626,6 +627,9 @@ static int ssd1307fb_probe(struct i2c_client *client)
>         if (device_property_read_u32(dev, "solomon,page-offset", &par->page_offset))
>                 par->page_offset = 1;
>
> +       if (of_property_read_u32(node, "solomon,col-offset", &par->col_offset))
> +               par->col_offset = 0;
> +
>         if (device_property_read_u32(dev, "solomon,com-offset", &par->com_offset))
>                 par->com_offset = 0;