From: Alex Deucher <alexdeucher@gmail.com>
Date: Tue, 16 Feb 2010 16:44:21 +0000 (-0500)
Subject: drm/radeon/kms: add LVDS pll quirk for Dell Studio 15
X-Git-Tag: firefly_0821_release~9833^2~2198^2~100^2~22
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8e0d84a63af351f5367103b83478f2cd4d9a3727;p=firefly-linux-kernel-4.4.55.git

drm/radeon/kms: add LVDS pll quirk for Dell Studio 15

fixes fdo bug 26358

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 731210bef744..79d445373c34 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1109,6 +1109,15 @@ static void radeon_atom_apply_lvds_quirks(struct drm_device *dev,
 			lvds->pll_algo = PLL_ALGO_LEGACY;
 	}
 
+	/* Dell Studio 15 laptop panel doesn't like new pll divider algo */
+	if ((dev->pdev->device == 0x95c4) &&
+	    (dev->pdev->subsystem_vendor == 0x1028) &&
+	    (dev->pdev->subsystem_device == 0x029f)) {
+		if ((lvds->native_mode.hdisplay == 1280) &&
+		    (lvds->native_mode.vdisplay == 800))
+			lvds->pll_algo = PLL_ALGO_LEGACY;
+	}
+
 }
 
 union lvds_info {