On Thu, Apr 27, 2017 at 10:09:35AM +0300, Jani Nikula wrote:
> On Wed, 26 Apr 2017, Imre Deak <imre.deak@xxxxxxxxx> wrote:
> > 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)
> >
> > Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> > ---
> > 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..3508f42 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) == PIPE_INVALID)
>
> Le pipe invalid? I think you mean INVALID_PIPE here.
Arg, forgot git add at some point..
--Imre
>
> BR,
> Jani.
>
> > + 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);
>
> --
> Jani Nikula, Intel Open Source Technology Center
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