lkml.org 
[lkml]   [2013]   [Jan]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 219/222] i915: ensure that VGA plane is disabled
Date
3.5.7.3 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Krzysztof Mazur <krzysiek@podlesie.net>

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@podlesie.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[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@decadent.org.uk>
[ herton: use version for 3.2 which is also valid for 3.5, only had to
adjust context ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
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(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b0b676a..a2c97bb 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1467,6 +1467,7 @@ static inline void intel_unregister_dsm_handler(void) { return; }

/* modesetting */
extern void intel_modeset_init_hw(struct drm_device *dev);
+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);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 5cd6449..b61bc50 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6964,6 +6964,23 @@ void intel_modeset_init_hw(struct drm_device *dev)
}
}

+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;
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index f85e2b1..37d7243 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -541,6 +541,7 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,

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;
--
1.7.9.5


\
 
 \ /
  Last update: 2013-01-16 20:24    [W:0.563 / U:0.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site