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drm/i915: Remove most INVALID_PIPE checks from the backlight code 

Now that the backlight device no longer gets registered too early we
should be able to drop most of the INVALID_PIPE checks from the backlight
code.

The only exceptio is the opregion stuff where we may (in theory at
least) get a request from the BIOS already during driver init as soon as
the backlight setup has been done. In which case we can still get the
INVALID_PIPE from intel_get_pipe_from_connector(). So leave that check
in place, and add a comment explaining why.

For the rest, if we still manage to get here with INVALID_PIPE on
VLV/CHV we will now get a WARN from the lower level functions and
can then actually investigate further.

v2: Leave the check in the BIOS related code (Jani)

Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
hifive-unleashed-5.1
Ville Syrjälä 2014-11-07 15:20:23 +02:00 committed by Daniel Vetter
parent 0962c3c9c7
commit 260d8f98ef
1 changed files with 9 additions and 5 deletions
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14
drivers/gpu/drm/i915/intel_panel.c
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@ -634,10 +634,9 @@ static void intel_panel_set_backlight(struct intel_connector *connector,
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 hw_level;
if (!panel->backlight.present || pipe == INVALID_PIPE)
if (!panel->backlight.present)
return;
mutex_lock(&dev_priv->backlight_lock);
@ -665,6 +664,12 @@ void intel_panel_set_backlight_acpi(struct intel_connector *connector,
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 hw_level;
/*
* INVALID_PIPE may occur during driver init because
* connection_mutex isn't held across the entire backlight
* setup + modeset readout, and the BIOS can issue the
* requests at any time.
*/
if (!panel->backlight.present || pipe == INVALID_PIPE)
return;
@ -740,9 +745,8 @@ void intel_panel_disable_backlight(struct intel_connector *connector)
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
if (!panel->backlight.present || pipe == INVALID_PIPE)
if (!panel->backlight.present)
return;
/*
@ -949,7 +953,7 @@ void intel_panel_enable_backlight(struct intel_connector *connector)
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
if (!panel->backlight.present || pipe == INVALID_PIPE)
if (!panel->backlight.present)
return;
DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));