From: Duncan Laurie dlaurie@chromium.org

This is the method used to override LVDS in intel_lvds and appears to be an effective way to ensure that the driver does not enable VGA hotplug.

This is the same patch from 2.6.32 kernel in R12 but ported to 2.6.38, will send upstream next.

Signed-off-by: Duncan Laurie dlaurie@chromium.org

BUG=chrome-os-partner:117 TEST=Check PORT_HOTPLUG_EN to see if hotplug interrupt is disabled. Run the following command as root, specifically looking at bit 9: mmio_read32 $[$(pci_read32 0 2 0 0x10) + 0x61110] = 0x00000000

Change-Id: Id8240f9fb31d058d8d79ee72f7b4615c43893f5a Reviewed-on: http://gerrit.chromium.org/gerrit/1390 Reviewed-by: Olof Johansson olofj@chromium.org Tested-by: Duncan Laurie dlaurie@chromium.org --- drivers/gpu/drm/i915/intel_crt.c | 23 +++++++++++++++++++++++ 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c index 0979d88..c1ecbfd 100644 --- a/drivers/gpu/drm/i915/intel_crt.c +++ b/drivers/gpu/drm/i915/intel_crt.c @@ -24,6 +24,7 @@ * Eric Anholt eric@anholt.net */

+#include <linux/dmi.h> #include <linux/i2c.h> #include <linux/slab.h> #include "drmP.h" @@ -544,6 +545,24 @@ static const struct drm_encoder_funcs intel_crt_enc_funcs = { .destroy = intel_encoder_destroy, };

+static int __init intel_no_crt_dmi_callback(const struct dmi_system_id *id) +{ + DRM_DEBUG_KMS("Skipping CRT initialization for %s\n", id->ident); + return 1; +} + +static const struct dmi_system_id intel_no_crt[] = { + { + .callback = intel_no_crt_dmi_callback, + .ident = "ACER ZGB", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ACER"), + DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"), + }, + }, + { } +}; + void intel_crt_init(struct drm_device *dev) { struct drm_connector *connector; @@ -551,6 +570,10 @@ void intel_crt_init(struct drm_device *dev) struct intel_connector *intel_connector; struct drm_i915_private *dev_priv = dev->dev_private;

+ /* Skip machines without VGA that falsely report hotplug events */ + if (dmi_check_system(intel_no_crt)) + return; + crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL); if (!crt) return;