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Commit 95ecde0f authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Greg Kroah-Hartman
Browse files

staging: fbtft: fb_ssd1306: Support smaller screen sizes 



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: default avatarNoralf Trønnes <noralf@tronnes.org>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 09142c17

drivers/staging/fbtft/fb_ssd1306.c

+21 −0
Original line number Diff line number Diff line
@@ -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)