linux-kernel - [PATCH 08/15] gma500: skip getting modes via DDC on Moorestown

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Message-ID: <20110715163408.28759.62807.stgit@localhost.localdomain>
Date:	Fri, 15 Jul 2011 17:34:15 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	greg@...ah.com, linux-kernel@...r.kernel.org
Subject: [PATCH 08/15] gma500: skip getting modes via DDC on Moorestown

From: Octavian Purdila <octavian.purdila@...el.com>

Moorestown does not have a DDC bus, skip getting modes via DDC. This
fixes the following bug:

BUG: unable to handle kernel NULL pointer dereference at 00000010
IP: [<c1172ff7>] i2c_transfer+0x17/0xb0
*pde = 00000000
Oops: 0000 [#1]

Call Trace:
 [<c1153ae9>] drm_do_probe_ddc_edid+0x59/0x90
 [<c1153cb4>] drm_get_edid+0x24/0x250
 [<c11805d2>] psb_intel_ddc_get_modes+0x22/0x60
 [<c117fe11>] psb_intel_lvds_get_modes+0x21/0x80

Signed-off-by: Octavian Purdila <octavian.purdila@...el.com>
Signed-off-by: Alan Cox <alan@...ux.intel.com>
---

 drivers/staging/gma500/psb_intel_lvds.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/gma500/psb_intel_lvds.c b/drivers/staging/gma500/psb_intel_lvds.c
index da6f5c8..53803b2 100644
--- a/drivers/staging/gma500/psb_intel_lvds.c
+++ b/drivers/staging/gma500/psb_intel_lvds.c
@@ -521,7 +521,8 @@ static int psb_intel_lvds_get_modes(struct drm_connector *connector)
 					psb_intel_output->mode_dev;
 	int ret = 0;
 
-	ret = psb_intel_ddc_get_modes(psb_intel_output);
+	if (!IS_MRST(dev))
+		ret = psb_intel_ddc_get_modes(psb_intel_output);
 
 	if (ret)
 		return ret;

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