linux-kernel - Re: [PATCH v2 5/6] staging: fbtft: fb_ssd1306: Support smaller screen sizes

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Date:   Tue, 3 Jan 2017 18:27:24 +0100
From:   Noralf Trønnes <noralf@...nnes.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/6] staging: fbtft: fb_ssd1306: Support smaller screen
 sizes


Den 02.01.2017 12:35, skrev Andy Shevchenko:
> There is 64x48 display exists. In order to support that set multiplexer
> to 48 pixels and window address to proper position in the graphic display
> data RAM.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---

Patches 5 and 6:
Acked-by: Noralf Trønnes <noralf@...nnes.org>


>   drivers/staging/fbtft/fb_ssd1306.c | 21 +++++++++++++++++++++
>   1 file changed, 21 insertions(+)
>
> diff --git a/drivers/staging/fbtft/fb_ssd1306.c b/drivers/staging/fbtft/fb_ssd1306.c
> index 80fc57029fee..bede2d5a5571 100644
> --- a/drivers/staging/fbtft/fb_ssd1306.c
> +++ b/drivers/staging/fbtft/fb_ssd1306.c
> @@ -62,6 +62,8 @@ static int init_display(struct fbtft_par *par)
>   	write_reg(par, 0xA8);
>   	if (par->info->var.yres == 64)
>   		write_reg(par, 0x3F);
> +	else if (par->info->var.yres == 48)
> +		write_reg(par, 0x2F);
>   	else
>   		write_reg(par, 0x1F);
>   
> @@ -95,6 +97,9 @@ static int init_display(struct fbtft_par *par)
>   	if (par->info->var.yres == 64)
>   		/* A[4]=1b, Alternative COM pin configuration */
>   		write_reg(par, 0x12);
> +	else if (par->info->var.yres == 48)
> +		/* A[4]=1b, Alternative COM pin configuration */
> +		write_reg(par, 0x12);
>   	else
>   		/* A[4]=0b, Sequential COM pin configuration */
>   		write_reg(par, 0x02);
> @@ -124,6 +129,19 @@ static int init_display(struct fbtft_par *par)
>   	return 0;
>   }
>   
> +static void set_addr_win_64x48(struct fbtft_par *par)
> +{
> +	/* Set Column Address */
> +	write_reg(par, 0x21);
> +	write_reg(par, 0x20);
> +	write_reg(par, 0x5F);
> +
> +	/* Set Page Address */
> +	write_reg(par, 0x22);
> +	write_reg(par, 0x0);
> +	write_reg(par, 0x5);
> +}
> +
>   static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
>   {
>   	/* Set Lower Column Start Address for Page Addressing Mode */
> @@ -132,6 +150,9 @@ static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
>   	write_reg(par, 0x10 | 0x0);
>   	/* Set Display Start Line */
>   	write_reg(par, 0x40 | 0x0);
> +
> +	if (par->info->var.xres == 64 && par->info->var.yres == 48)
> +		set_addr_win_64x48(par);
>   }
>   
>   static int blank(struct fbtft_par *par, bool on)