mirror/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

staging: fbtft: fb_ssd1306: Support smaller screen sizes

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/staging/fbtft/fb_ssd1306.c
View File

@@ -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)