An error from intel_get_pipe_from_connector() would mean a bug somewhere
else, but we still should check for it to prevent some other more
obscure bug later.
v2:
- Fall back to a reasonable default instead of bailing out in case of
error. (Jani)
v3:
- Fix s/PIPE_INVALID/INVALID_PIPE/ typo. (Jani)
v4:
- Fix bogus bracing around WARN() condition. (Ville)
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx> (v3)
---
drivers/gpu/drm/i915/intel_panel.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index cb50c52..c8103f8 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -888,10 +888,14 @@ static void pch_enable_backlight(struct intel_connector *connector)
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
- enum transcoder cpu_transcoder =
- intel_pipe_to_cpu_transcoder(dev_priv, pipe);
+ enum transcoder cpu_transcoder;
u32 cpu_ctl2, pch_ctl1, pch_ctl2;
+ if (!WARN_ON_ONCE(pipe == INVALID_PIPE))
+ cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv, pipe);
+ else
+ cpu_transcoder = TRANSCODER_EDP;
+
cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
if (cpu_ctl2 & BLM_PWM_ENABLE) {
DRM_DEBUG_KMS("cpu backlight already enabled\n");
@@ -973,6 +977,9 @@ static void i965_enable_backlight(struct intel_connector *connector)
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 ctl, ctl2, freq;
+ if (WARN_ON_ONCE(pipe == INVALID_PIPE))
+ pipe = PIPE_A;
+
ctl2 = I915_READ(BLC_PWM_CTL2);
if (ctl2 & BLM_PWM_ENABLE) {
DRM_DEBUG_KMS("backlight already enabled\n");
@@ -1037,6 +1044,9 @@ static void bxt_enable_backlight(struct intel_connector *connector)
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 pwm_ctl, val;
+ if (WARN_ON_ONCE(pipe == INVALID_PIPE))
+ pipe = PIPE_A;
+
/* Controller 1 uses the utility pin. */
if (panel->backlight.controller == 1) {
val = I915_READ(UTIL_PIN_CTL);
@@ -1093,7 +1103,8 @@ void intel_panel_enable_backlight(struct intel_connector *connector)
if (!panel->backlight.present)
return;
- DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
+ if (!WARN_ON_ONCE(pipe == INVALID_PIPE))
+ DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
mutex_lock(&dev_priv->backlight_lock);
--
2.5.0
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