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fbdev: fix parsing of standard timings

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The standard timings parses uses 1:1 dimensions when the ratio in the
EDID data is 0. However, for EDID 1.3 and later the dimensions are 16:10
when the ratio is 0.

Pass the version and revision numbers to get_std_timing() which can then
make the right decision about dimensions.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
This commit is contained in:
Tomi Valkeinen 2011-08-25 15:36:40 +03:00 committed by Florian Tobias Schandinat
parent f88a91ccc8
commit 43dcd13b9a
1 changed files with 15 additions and 6 deletions
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21
drivers/video/fbmon.c
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@ -493,7 +493,8 @@ static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
return num;
}
static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
static int get_std_timing(unsigned char *block, struct fb_videomode *mode,
int ver, int rev)
{
int xres, yres = 0, refresh, ratio, i;
@ -504,7 +505,11 @@ static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
ratio = (block[1] & 0xc0) >> 6;
switch (ratio) {
case 0:
yres = xres;
/* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */
if (ver < 1 || (ver == 1 && rev < 3))
yres = xres;
else
yres = (xres * 10)/16;
break;
case 1:
yres = (xres * 3)/4;
@ -533,12 +538,12 @@ static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
}
static int get_dst_timing(unsigned char *block,
struct fb_videomode *mode)
struct fb_videomode *mode, int ver, int rev)
{
int j, num = 0;
for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE)
num += get_std_timing(block, &mode[num]);
num += get_std_timing(block, &mode[num], ver, rev);
return num;
}
@ -599,6 +604,10 @@ static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
struct fb_videomode *mode, *m;
unsigned char *block;
int num = 0, i, first = 1;
int ver, rev;
ver = edid[EDID_STRUCT_VERSION];
rev = edid[EDID_STRUCT_REVISION];
mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
if (mode == NULL)
@ -632,12 +641,12 @@ static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
DPRINTK(" Standard Timings\n");
block = edid + STD_TIMING_DESCRIPTIONS_START;
for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
num += get_std_timing(block, &mode[num]);
num += get_std_timing(block, &mode[num], ver, rev);
block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
num += get_dst_timing(block + 5, &mode[num]);
num += get_dst_timing(block + 5, &mode[num], ver, rev);
}
/* Yikes, EDID data is totally useless */