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atmel_lcdfb: Fix STN LCD support 

Fixes STN LCD support for the atmel_lcdfb framebuffer driver.

This patch is the result of a work from Jan Altenberg and has
been tested on a Hitachi SP06Q002 on at91sam9261ek.

It adds a Kconfig switch that enables the proper LCD in the
board configuration file (STN or TFT). The switch is used
in arch/arm/mach-at91/at91sam9261_devices.c & board-sam9261ek.c
as an example.

This patch includes the "Fix wrong line_length calculation"
little one from Jan and Haavard (submitted earlier).

AT91 platform informations are directly submitted trough
the at91 maintainer, here :
http://article.gmane.org/gmane.linux.kernel/543158

Signed-off-by: Nicolas Ferre <nicolas.ferre@rfo.atmel.com>
Cc: "Antonino A. Daplas" <adaplas@gmail.com>
Cc: Jan Altenberg <jan.altenberg@linutronix.de>
Cc: Patrice Vilchez <patrice.vilchez@rfo.atmel.com>
Cc: Andrew Victor <andrew@sanpeople.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nicolas Ferre 2007-07-21 04:37:59 -07:00 committed by Linus Torvalds
parent 029641151b
commit 250a269da4
2 changed files with 64 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/video/Kconfig
View File

@ -849,6 +849,16 @@ config FB_INTSRAM
Say Y if you want to map Frame Buffer in internal SRAM. Say N if you want
to let frame buffer in external SDRAM.
config FB_ATMEL_STN
bool "Use a STN display with AT91/AT32 LCD Controller"
depends on FB_ATMEL && MACH_AT91SAM9261EK
default n
help
Say Y if you want to connect a STN LCD display to the AT91/AT32 LCD
Controller. Say N if you want to connect a TFT.
If unsure, say N.
config FB_NVIDIA
tristate "nVidia Framebuffer Support"
depends on FB && PCI

62
drivers/video/atmel_lcdfb.c
View File

@ -79,6 +79,29 @@ static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
.accel = FB_ACCEL_NONE,
};
static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2)
{
unsigned long value;
if (!(cpu_is_at91sam9261() || cpu_is_at32ap7000()))
return xres;
value = xres;
if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
/* STN display */
if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
value *= 3;
}
if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
|| ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
&& (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
value = DIV_ROUND_UP(value, 4);
else
value = DIV_ROUND_UP(value, 8);
}
return value;
}
static void atmel_lcdfb_update_dma(struct fb_info *info,
struct fb_var_screeninfo *var)
@ -181,6 +204,7 @@ static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
var->xoffset = var->yoffset = 0;
switch (var->bits_per_pixel) {
case 1:
case 2:
case 4:
case 8:
@ -228,8 +252,10 @@ static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
static int atmel_lcdfb_set_par(struct fb_info *info)
{
struct atmel_lcdfb_info *sinfo = info->par;
unsigned long hozval_linesz;
unsigned long value;
unsigned long clk_value_khz;
unsigned long bits_per_line;
dev_dbg(info->device, "%s:\n", __func__);
dev_dbg(info->device, " * resolution: %ux%u (%ux%u virtual)\n",
@ -241,12 +267,15 @@ static int atmel_lcdfb_set_par(struct fb_info *info)
lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
if (info->var.bits_per_pixel <= 8)
if (info->var.bits_per_pixel == 1)
info->fix.visual = FB_VISUAL_MONO01;
else if (info->var.bits_per_pixel <= 8)
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
else
info->fix.visual = FB_VISUAL_TRUECOLOR;
info->fix.line_length = info->var.xres_virtual * (info->var.bits_per_pixel / 8);
bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
/* Re-initialize the DMA engine... */
dev_dbg(info->device, " * update DMA engine\n");
@ -262,18 +291,21 @@ static int atmel_lcdfb_set_par(struct fb_info *info)
/* Set pixel clock */
clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
value = clk_value_khz / PICOS2KHZ(info->var.pixclock);
if (clk_value_khz % PICOS2KHZ(info->var.pixclock))
value++;
value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
value = (value / 2) - 1;
dev_dbg(info->device, " * programming CLKVAL = 0x%08lx\n", value);
if (value <= 0) {
dev_notice(info->device, "Bypassing pixel clock divider\n");
lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
} else
} else {
lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, value << ATMEL_LCDC_CLKVAL_OFFSET);
info->var.pixclock = KHZ2PICOS(clk_value_khz / (2 * (value + 1)));
dev_dbg(info->device, " updated pixclk: %lu KHz\n",
PICOS2KHZ(info->var.pixclock));
}
/* Initialize control register 2 */
value = sinfo->default_lcdcon2;
@ -311,9 +343,14 @@ static int atmel_lcdfb_set_par(struct fb_info *info)
dev_dbg(info->device, " * LCDTIM2 = %08lx\n", value);
lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
/* Horizontal value (aka line size) */
hozval_linesz = compute_hozval(info->var.xres,
lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));
/* Display size */
value = (info->var.xres - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
value |= info->var.yres - 1;
dev_dbg(info->device, " * LCDFRMCFG = %08lx\n", value);
lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
/* FIFO Threshold: Use formula from data sheet */
@ -421,6 +458,15 @@ static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
ret = 0;
}
break;
case FB_VISUAL_MONO01:
if (regno < 2) {
val = (regno == 0) ? 0x00 : 0x1F;
lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
ret = 0;
}
break;
}
return ret;