This is a note to let you know that I've just added the patch titled
i915: ensure that VGA plane is disabled
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
i915-ensure-that-vga-plane-is-disabled.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 29abfe4ddc74a2a597f4a47f02df1f5c4ad4a521 Mon Sep 17 00:00:00 2001
From: Krzysztof Mazur <krzysiek@xxxxxxxxxxxx>
Date: Wed, 19 Dec 2012 11:03:41 +0100
Subject: i915: ensure that VGA plane is disabled
From: Krzysztof Mazur <krzysiek@xxxxxxxxxxxx>
commit 0fde901f1ddd2ce0e380a6444f1fb7ca555859e9 upstream.
Some broken systems (like HP nc6120) in some cases, usually after LID
close/open, enable VGA plane, making display unusable (black screen on LVDS,
some strange mode on VGA output). We used to disable VGA plane only once at
startup. Now we also check, if VGA plane is still disabled while changing
mode, and fix that if something changed it.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=57434
Signed-off-by: Krzysztof Mazur <krzysiek@xxxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
[bwh: Backported to 3.2: intel_modeset_setup_hw_state() does not
exist, so call i915_redisable_vga() directly from intel_lid_notify()]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Qiang Huang <h.huangqiang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_display.c | 17 +++++++++++++++++
drivers/gpu/drm/i915/intel_lvds.c | 1 +
3 files changed, 19 insertions(+)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1397,6 +1397,7 @@ static inline void intel_unregister_dsm_
#endif /* CONFIG_ACPI */
/* modesetting */
+extern void i915_redisable_vga(struct drm_device *dev);
extern void intel_modeset_init(struct drm_device *dev);
extern void intel_modeset_gem_init(struct drm_device *dev);
extern void intel_modeset_cleanup(struct drm_device *dev);
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9254,6 +9254,23 @@ static void i915_disable_vga(struct drm_
POSTING_READ(vga_reg);
}
+void i915_redisable_vga(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 vga_reg;
+
+ if (HAS_PCH_SPLIT(dev))
+ vga_reg = CPU_VGACNTRL;
+ else
+ vga_reg = VGACNTRL;
+
+ if (I915_READ(vga_reg) != VGA_DISP_DISABLE) {
+ DRM_DEBUG_KMS("Something enabled VGA plane, disabling it\n");
+ I915_WRITE(vga_reg, VGA_DISP_DISABLE);
+ POSTING_READ(vga_reg);
+ }
+}
+
void intel_modeset_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -535,6 +535,7 @@ static int intel_lid_notify(struct notif
mutex_lock(&dev->mode_config.mutex);
drm_helper_resume_force_mode(dev);
+ i915_redisable_vga(dev);
mutex_unlock(&dev->mode_config.mutex);
return NOTIFY_OK;
Patches currently in stable-queue which might be from krzysiek@xxxxxxxxxxxx are
queue-3.4/i915-ensure-that-vga-plane-is-disabled.patch
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