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

[Noralf Trønnes]

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.shevche...@linux.intel.com>
---

Patches 5 and 6:
Acked-by: Noralf Trønnes <nor...@tronnes.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)