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drm/i915: Add breadcrumbs for why the backlight is being set

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At the moment we have 3 paths that lead to actually_set_backlight(),
from modesetting, ACPI/OpRegion requests and our very own
intel_backlight interface, and we have no way of distinguishing them in
the debug log. So add a debug breadcrumb to explain the source of the
backlight changes.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2013-10-13 12:56:31 +01:00 committed by Daniel Vetter
parent 391f75e2bf
commit 540b5d0276
2 changed files with 5 additions and 0 deletions
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1
drivers/gpu/drm/i915/intel_opregion.c
View File

@ -407,6 +407,7 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
if (bclp > 255)
return ASLC_BACKLIGHT_FAILED;
DRM_DEBUG_KMS("updating opregion backlight %d/255\n", bclp);
intel_panel_set_backlight(dev, bclp, 255);
iowrite32(DIV_ROUND_UP(bclp * 100, 255) | ASLE_CBLV_VALID, &asle->cblv);

4
drivers/gpu/drm/i915/intel_panel.c
View File

@ -574,6 +574,8 @@ void intel_panel_enable_backlight(struct drm_device *dev,
intel_pipe_to_cpu_transcoder(dev_priv, pipe);
unsigned long flags;
DRM_DEBUG_KMS("pipe=%d\n", pipe);
spin_lock_irqsave(&dev_priv->backlight.lock, flags);
if (dev_priv->backlight.level == 0) {
@ -680,6 +682,8 @@ intel_panel_detect(struct drm_device *dev)
static int intel_panel_update_status(struct backlight_device *bd)
{
struct drm_device *dev = bl_get_data(bd);
DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
bd->props.brightness, bd->props.max_brightness);
intel_panel_set_backlight(dev, bd->props.brightness,
bd->props.max_brightness);
return 0;