diff options
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbmon.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c index fbbcb7156a34..87b0224d2347 100644 --- a/drivers/video/fbmon.c +++ b/drivers/video/fbmon.c @@ -605,6 +605,7 @@ static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs) block = edid + DETAILED_TIMING_DESCRIPTIONS_START; DPRINTK(" Monitor Operating Limits: "); + for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) { if (edid_is_limits_block(block)) { specs->hfmin = H_MIN_RATE * 1000; @@ -618,11 +619,12 @@ static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs) break; } } - + /* estimate monitor limits based on modes supported */ if (retval) { - struct fb_videomode *modes; + struct fb_videomode *modes, *mode; int num_modes, i, hz, hscan, pixclock; + int vtotal, htotal; modes = fb_create_modedb(edid, &num_modes); if (!modes) { @@ -632,20 +634,38 @@ static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs) retval = 0; for (i = 0; i < num_modes; i++) { - hz = modes[i].refresh; + mode = &modes[i]; pixclock = PICOS2KHZ(modes[i].pixclock) * 1000; - hscan = (modes[i].yres * 105 * hz + 5000)/100; + htotal = mode->xres + mode->right_margin + mode->hsync_len + + mode->left_margin; + vtotal = mode->yres + mode->lower_margin + mode->vsync_len + + mode->upper_margin; + + if (mode->vmode & FB_VMODE_INTERLACED) + vtotal /= 2; + + if (mode->vmode & FB_VMODE_DOUBLE) + vtotal *= 2; + + hscan = (pixclock + htotal / 2) / htotal; + hscan = (hscan + 500) / 1000 * 1000; + hz = (hscan + vtotal / 2) / vtotal; if (specs->dclkmax == 0 || specs->dclkmax < pixclock) specs->dclkmax = pixclock; + if (specs->dclkmin == 0 || specs->dclkmin > pixclock) specs->dclkmin = pixclock; + if (specs->hfmax == 0 || specs->hfmax < hscan) specs->hfmax = hscan; + if (specs->hfmin == 0 || specs->hfmin > hscan) specs->hfmin = hscan; + if (specs->vfmax == 0 || specs->vfmax < hz) specs->vfmax = hz; + if (specs->vfmin == 0 || specs->vfmin > hz) specs->vfmin = hz; } |