drm/nv40: add LVDS table quirk for Dell Latitude D620 (2eb92c80) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/gpu/drm/nouveau/nouveau_bios.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -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);