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drm/i915: panel: invert brightness via quirk 

A machine may need to invert the panel backlight brightness value. This
patch adds the infrastructure for a quirk to do so.

Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Carsten Emde 2012-03-15 15:56:26 +01:00 committed by Daniel Vetter
parent 7bd90909bb
commit 4dca20efb1
4 changed files with 32 additions and 10 deletions
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17
Documentation/kernel-parameters.txt
View File

@ -967,14 +967,19 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN
capability is set.
i915.invert_brightness
i915.invert_brightness=
[DRM] Invert the sense of the variable that is used to
set the brightness of the panel backlight. Normally a
value of 0 indicates backlight switched off, and the
maximum value sets the backlight to maximum brightness.
If this parameter is specified, a value of 0 sets the
backlight to maximum brightness, and the maximum value
switches the backlight off.
brightness value of 0 indicates backlight switched off,
and the maximum of the brightness value sets the backlight
to maximum brightness. If this parameter is set to 0
(default) and the machine requires it, or this parameter
is set to 1, a brightness value of 0 sets the backlight
to maximum brightness, and the maximum of the brightness
value switches the backlight off.
-1 -- never invert brightness
0 -- machine default
1 -- force brightness inversion
icn= [HW,ISDN]
Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -295,6 +295,7 @@ enum intel_pch {
#define QUIRK_PIPEA_FORCE (1<<0)
#define QUIRK_LVDS_SSC_DISABLE (1<<1)
#define QUIRK_INVERT_BRIGHTNESS (1<<2)
struct intel_fbdev;
struct intel_fbc_work;

9
drivers/gpu/drm/i915/intel_display.c
View File

@ -9020,6 +9020,15 @@ static void quirk_ssc_force_disable(struct drm_device *dev)
dev_priv->quirks |= QUIRK_LVDS_SSC_DISABLE;
}
/*
* A machine may need to invert the panel backlight brightness value
*/
static void quirk_invert_brightness(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
dev_priv->quirks |= QUIRK_INVERT_BRIGHTNESS;
}
struct intel_quirk {
int device;
int subsystem_vendor;

15
drivers/gpu/drm/i915/intel_panel.c
View File

@ -192,15 +192,22 @@ u32 intel_panel_get_max_backlight(struct drm_device *dev)
return max;
}
static bool i915_panel_invert_brightness;
MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness, please "
static int i915_panel_invert_brightness;
MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
"(-1 force normal, 0 machine defaults, 1 force inversion), please "
"report PCI device ID, subsystem vendor and subsystem device ID "
"to dri-devel@lists.freedesktop.org, if your machine needs it. "
"It will then be included in an upcoming module version.");
module_param_named(invert_brightness, i915_panel_invert_brightness, bool, 0600);
module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
{
if (i915_panel_invert_brightness)
struct drm_i915_private *dev_priv = dev->dev_private;
if (i915_panel_invert_brightness < 0)
return val;
if (i915_panel_invert_brightness > 0 ||
dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)
return intel_panel_get_max_backlight(dev) - val;
return val;