diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_panel.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_panel.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index 230a141dbea..cad45ff8251 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -28,6 +28,9 @@ * Chris Wilson <chris@chris-wilson.co.uk> */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/moduleparam.h> #include "intel_drv.h" #define PCI_LBPC 0xf4 /* legacy/combination backlight modes */ @@ -171,7 +174,7 @@ u32 intel_panel_get_max_backlight(struct drm_device *dev) /* XXX add code here to query mode clock or hardware clock * and program max PWM appropriately. */ - printk_once(KERN_WARNING "fixme: max PWM is zero.\n"); + pr_warn_once("fixme: max PWM is zero\n"); return 1; } @@ -191,6 +194,27 @@ u32 intel_panel_get_max_backlight(struct drm_device *dev) return max; } +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, int, 0600); +static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val) +{ + 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; +} + u32 intel_panel_get_backlight(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; @@ -211,6 +235,7 @@ u32 intel_panel_get_backlight(struct drm_device *dev) } } + val = intel_panel_compute_brightness(dev, val); DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val); return val; } @@ -228,6 +253,7 @@ static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level u32 tmp; DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level); + level = intel_panel_compute_brightness(dev, level); if (HAS_PCH_SPLIT(dev)) return intel_pch_panel_set_backlight(dev, level); |