From: Paul Mundt Date: Wed, 6 Feb 2008 09:39:18 +0000 (-0800) Subject: fb: nvidiafb: Try harder at initial mode setting. X-Git-Tag: v2.6.25-rc1~583 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=74f482cca5f76643e7f323e66cc38b1a882d5e6f;p=linux-2.6 fb: nvidiafb: Try harder at initial mode setting. The current nvidiafb_check_var() simply bails out if the selected mode is out of range of the panel dimensions. A good question would be why the bogus mode is being selected in the first place -- the panel dimensions that are read back are certainly bogus, but alas, I have no idea where to even begin looking at the i2c/EDID/DDC mess: nvidiafb: Device ID: 10de0165 nvidiafb: CRTC0 analog not found nvidiafb: CRTC1 analog not found nvidiafb: EDID found from BUS1 nvidiafb: CRTC 0 is currently programmed for DFP nvidiafb: Using DFP on CRTC 0 nvidiafb: Panel size is 1280 x 1024 nvidiafb: Panel is TMDS nvidiafb: unable to setup MTRR nvidiafb: Flat panel dithering disabled nvidiafb: PCI nVidia NV16 framebuffer (64MB @ 0xC0000000) In my .config I presently have: CONFIG_FIRMWARE_EDID=y CONFIG_FB_DDC=y CONFIG_FB_NVIDIA_I2C=y I've not tried fiddling with these options, as I haven't the vaguest idea what I should be looking at. As a workaround, simply groveling for a new mode based on the probed dimensions seems to work ok. While it would be nice to debug this further and sort out why the panel information is bogus, I think it's still worth retrying the mode based on the panel information at hand as a last-ditch effort, rather than simply bailing out completely. Signed-off-by: Paul Mundt Cc: Antonino A. Daplas Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/video/nvidia/nvidia.c b/drivers/video/nvidia/nvidia.c index 30e14eb1f5..74517b1b26 100644 --- a/drivers/video/nvidia/nvidia.c +++ b/drivers/video/nvidia/nvidia.c @@ -849,9 +849,27 @@ static int nvidiafb_check_var(struct fb_var_screeninfo *var, if (!mode_valid && info->monspecs.modedb_len) return -EINVAL; + /* + * If we're on a flat panel, check if the mode is outside of the + * panel dimensions. If so, cap it and try for the next best mode + * before bailing out. + */ if (par->fpWidth && par->fpHeight && (par->fpWidth < var->xres || - par->fpHeight < var->yres)) - return -EINVAL; + par->fpHeight < var->yres)) { + const struct fb_videomode *mode; + + var->xres = par->fpWidth; + var->yres = par->fpHeight; + + mode = fb_find_best_mode(var, &info->modelist); + if (!mode) { + printk(KERN_ERR PFX "mode out of range of flat " + "panel dimensions\n"); + return -EINVAL; + } + + fb_videomode_to_var(var, mode); + } if (var->yres_virtual < var->yres) var->yres_virtual = var->yres;