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staging: fbtft: fb_ssd1306: Support smaller screen sizes

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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.

Acked-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2017-01-19 12:45:44 +02:00 • committed by Greg Kroah-Hartman
parent 09142c17da
commit 95ecde0f65
1 changed files with 21 additions and 0 deletions
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21
drivers/staging/fbtft/fb_ssd1306.c
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@ -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)