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drm/nv40: add LVDS table quirk for Dell Latitude D620 

Should fix:
 https://bugzilla.redhat.com/show_bug.cgi?id=505132
 https://bugzilla.redhat.com/show_bug.cgi?id=543091
 https://bugzilla.redhat.com/show_bug.cgi?id=530425
 https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/
 +bug/539730

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-03-18 13:38:04 +10:00
parent f3bbb9ccbf
commit 2eb92c8007
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/nouveau/nouveau_bios.c
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@ -3659,6 +3659,21 @@ int nouveau_bios_parse_lvds_table(struct drm_device *dev, int pxclk, bool *dl, b
break;
}
/* Dell Latitude D620 reports a too-high value for the dual-link
* transition freq, causing us to program the panel incorrectly.
*
* It doesn't appear the VBIOS actually uses its transition freq
* (90000kHz), instead it uses the "Number of LVDS channels" field
* out of the panel ID structure (http://www.spwg.org/).
*
* For the moment, a quirk will do :)
*/
if ((dev->pdev->device == 0x01d7) &&
(dev->pdev->subsystem_vendor == 0x1028) &&
(dev->pdev->subsystem_device == 0x01c2)) {
bios->fp.duallink_transition_clk = 80000;
}
/* set dual_link flag for EDID case */
if (pxclk && (chip_version < 0x25 || chip_version > 0x28))
bios->fp.dual_link = (pxclk >= bios->fp.duallink_transition_clk);