This is a note to let you know that I've just added the patch titled
drm/i915: quirk asserts controllable backlight presence, overriding VBT
to the 3.15-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:
drm-i915-quirk-asserts-controllable-backlight-presence-overriding-vbt.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9c72cc6f00d24711ef585772396dd1ae180881a6 Mon Sep 17 00:00:00 2001
From: Scot Doyle <lkml14@xxxxxxxxxxxxx>
Date: Thu, 3 Jul 2014 23:27:50 +0000
Subject: drm/i915: quirk asserts controllable backlight presence, overriding VBT
From: Scot Doyle <lkml14@xxxxxxxxxxxxx>
commit 9c72cc6f00d24711ef585772396dd1ae180881a6 upstream.
commit c675949ec58ca50d5a3ae3c757892f1560f6e896
Author: Jani Nikula <jani.nikula@xxxxxxxxx>
Date: Wed Apr 9 11:31:37 2014 +0300
drm/i915: do not setup backlight if not available according to VBT
caused a regression on machines with a misconfigured VBT. Add a quirk to
assert the presence of a controllable backlight. Use it to ignore the VBT
backlight presence check during backlight setup.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79813
Tested-by: James Duley <jagduley@xxxxxxxxx>
Tested-by: Michael Mullin <masmullin@xxxxxxxxx>
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Scot Doyle <lkml14@xxxxxxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
[danvet: Add cc: stable because the regressing commit is in 3.15.]
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_display.c | 8 ++++++++
drivers/gpu/drm/i915/intel_panel.c | 8 ++++++--
3 files changed, 15 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -803,6 +803,7 @@ enum intel_sbi_destination {
#define QUIRK_PIPEA_FORCE (1<<0)
#define QUIRK_LVDS_SSC_DISABLE (1<<1)
#define QUIRK_INVERT_BRIGHTNESS (1<<2)
+#define QUIRK_BACKLIGHT_PRESENT (1<<3)
struct intel_fbdev;
struct intel_fbc_work;
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11166,6 +11166,14 @@ static void quirk_invert_brightness(stru
DRM_INFO("applying inverted panel brightness quirk\n");
}
+/* Some VBT's incorrectly indicate no backlight is present */
+static void quirk_backlight_present(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ dev_priv->quirks |= QUIRK_BACKLIGHT_PRESENT;
+ DRM_INFO("applying backlight present quirk\n");
+}
+
struct intel_quirk {
int device;
int subsystem_vendor;
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -1065,8 +1065,12 @@ int intel_panel_setup_backlight(struct d
int ret;
if (!dev_priv->vbt.backlight.present) {
- DRM_DEBUG_KMS("native backlight control not available per VBT\n");
- return 0;
+ if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
+ DRM_DEBUG_KMS("no backlight present per VBT, but present per quirk\n");
+ } else {
+ DRM_DEBUG_KMS("no backlight present per VBT\n");
+ return 0;
+ }
}
/* set level and max in panel struct */
Patches currently in stable-queue which might be from lkml14@xxxxxxxxxxxxx are
queue-3.15/drm-i915-toshiba-cb35-has-a-controllable-backlight.patch
queue-3.15/drm-i915-quirk-asserts-controllable-backlight-presence-overriding-vbt.patch
queue-3.15/drm-i915-acer-c720-and-c720p-have-controllable-backlights.patch
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