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video, sm501: add edid and commandline support 

- add commandline options:
  sm501fb.mode:
    Specify resolution as "<xres>x<yres>[-<bpp>][@<refresh>]"
  sm501fb.bpp:
    Specify bit-per-pixel if not specified mode

- Add support for encoding display mode information
  in the device tree using verbatim EDID block.

  If the "edid" entry in the "smi,sm501" node is present,
  the driver will build mode database using EDID data
  and allow setting the display modes from this database.

Signed-off-by: Heiko Schocher <hs@denx.de>
cc: linux-fbdev@vger.kernel.org
cc: devicetree-discuss@ozlabs.org
cc: Ben Dooks <ben@simtec.co.uk>
cc: Vincent Sanders <vince@simtec.co.uk>
cc: Samuel Ortiz <sameo@linux.intel.com>
cc: linux-kernel@vger.kernel.org
cc: Randy Dunlap <rdunlap@xenotime.net>
cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
hifive-unleashed-5.1
Heiko Schocher 2011-01-26 07:21:22 +00:00 committed by Paul Mundt
parent bf5f001904
commit e6a0498071
2 changed files with 70 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Documentation/fb/sm501.txt 100644
View File

@ -0,0 +1,10 @@
Configuration:
You can pass the following kernel command line options to sm501 videoframebuffer:
sm501fb.bpp= SM501 Display driver:
Specifiy bits-per-pixel if not specified by 'mode'
sm501fb.mode= SM501 Display driver:
Specify resolution as
"<xres>x<yres>[-<bpp>][@<refresh>]"

65
drivers/video/sm501fb.c
View File

@ -41,6 +41,26 @@
#include <linux/sm501.h>
#include <linux/sm501-regs.h>
#include "edid.h"
static char *fb_mode = "640x480-16@60";
static unsigned long default_bpp = 16;
static struct fb_videomode __devinitdata sm501_default_mode = {
.refresh = 60,
.xres = 640,
.yres = 480,
.pixclock = 20833,
.left_margin = 142,
.right_margin = 13,
.upper_margin = 21,
.lower_margin = 1,
.hsync_len = 69,
.vsync_len = 3,
.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
};
#define NR_PALETTE 256
enum sm501_controller {
@ -77,6 +97,7 @@ struct sm501fb_info {
void __iomem *regs2d; /* 2d remapped registers */
void __iomem *fbmem; /* remapped framebuffer */
size_t fbmem_len; /* length of remapped region */
u8 *edid_data;
};
/* per-framebuffer private data */
@ -1725,9 +1746,16 @@ static int sm501fb_init_fb(struct fb_info *fb,
fb->var.vmode = FB_VMODE_NONINTERLACED;
fb->var.bits_per_pixel = 16;
if (info->edid_data) {
/* Now build modedb from EDID */
fb_edid_to_monspecs(info->edid_data, &fb->monspecs);
fb_videomode_to_modelist(fb->monspecs.modedb,
fb->monspecs.modedb_len,
&fb->modelist);
}
if (enable && (pd->flags & SM501FB_FLAG_USE_INIT_MODE) && 0) {
/* TODO read the mode from the current display */
} else {
if (pd->def_mode) {
dev_info(info->dev, "using supplied mode\n");
@ -1737,12 +1765,34 @@ static int sm501fb_init_fb(struct fb_info *fb,
fb->var.xres_virtual = fb->var.xres;
fb->var.yres_virtual = fb->var.yres;
} else {
ret = fb_find_mode(&fb->var, fb,
if (info->edid_data)
ret = fb_find_mode(&fb->var, fb, fb_mode,
fb->monspecs.modedb,
fb->monspecs.modedb_len,
&sm501_default_mode, default_bpp);
else
ret = fb_find_mode(&fb->var, fb,
NULL, NULL, 0, NULL, 8);
if (ret == 0 || ret == 4) {
dev_err(info->dev,
"failed to get initial mode\n");
switch (ret) {
case 1:
dev_info(info->dev, "using mode specified in "
"@mode\n");
break;
case 2:
dev_info(info->dev, "using mode specified in "
"@mode with ignored refresh rate\n");
break;
case 3:
dev_info(info->dev, "using mode default "
"mode\n");
break;
case 4:
dev_info(info->dev, "using mode from list\n");
break;
default:
dev_info(info->dev, "ret = %d\n", ret);
dev_info(info->dev, "failed to find mode\n");
return -EINVAL;
}
}
@ -2157,6 +2207,11 @@ static void __exit sm501fb_cleanup(void)
module_init(sm501fb_init);
module_exit(sm501fb_cleanup);
module_param_named(mode, fb_mode, charp, 0);
MODULE_PARM_DESC(mode,
"Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\" ");
module_param_named(bpp, default_bpp, ulong, 0);
MODULE_PARM_DESC(bpp, "Specify bit-per-pixel if not specified mode");
MODULE_AUTHOR("Ben Dooks, Vincent Sanders");
MODULE_DESCRIPTION("SM501 Framebuffer driver");
MODULE_LICENSE("GPL v2");