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imxfb: add 18 bit support 

v2: As pointed out by Hans J. Koch we have to claim we can do 24bit to
    make software like X work. We are lucky on i.MX that 18bit support
    has the necessary gaps in the fields to do so.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
hifive-unleashed-5.1
Sascha Hauer 2009-01-26 17:31:02 +01:00
parent 9db973a59b
commit 1512222b10
1 changed files with 15 additions and 4 deletions
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19
drivers/video/imxfb.c
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@ -14,7 +14,6 @@
* linux-arm-kernel@lists.arm.linux.org.uk
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
@ -159,6 +158,17 @@ struct imxfb_info {
#define MIN_XRES 64
#define MIN_YRES 64
/* Actually this really is 18bit support, the lowest 2 bits of each colour
* are unused in hardware. We claim to have 24bit support to make software
* like X work, which does not support 18bit.
*/
static struct imxfb_rgb def_rgb_18 = {
.red = {.offset = 16, .length = 8,},
.green = {.offset = 8, .length = 8,},
.blue = {.offset = 0, .length = 8,},
.transp = {.offset = 0, .length = 0,},
};
static struct imxfb_rgb def_rgb_16_tft = {
.red = {.offset = 11, .length = 5,},
.green = {.offset = 5, .length = 6,},
@ -286,6 +296,9 @@ static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
switch (var->bits_per_pixel) {
case 32:
rgb = &def_rgb_18;
break;
case 16:
default:
if (readl(fbi->regs + LCDC_PCR) & PCR_TFT)
@ -327,9 +340,7 @@ static int imxfb_set_par(struct fb_info *info)
struct imxfb_info *fbi = info->par;
struct fb_var_screeninfo *var = &info->var;
pr_debug("set_par\n");
if (var->bits_per_pixel == 16)
if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
info->fix.visual = FB_VISUAL_TRUECOLOR;
else if (!fbi->cmap_static)
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;