On Thu, 12 Oct 2017, Mika Kahola <mika.kahola@xxxxxxxxx> wrote: > CI system spotted an error on CFL system when running IGT tests with > display disabled. In this case, the 'INTEL_INFO(dev_priv)->num_pipes' > is set to 0. This will cause that we prematurely return from > 'get_saved_enc()'. > > To fix this issue, the patch introduces a 'max_pipes' variable which caches > the maximum number of available pipes. This is not the right fix. The audio component init should be skipped and thus all component calls blocked when num_pipes == 0. It's just that the num_pipes = 0 happens way too late when the display is fused off or disabled via modparam. This makes me wonder how many things we actually screw up because intel_device_info_runtime_init() happens too late. > Reference: https://bugs.freedesktop.org/show_bug.cgi?id=103206 If this patch fixes the bug, we use Bugzilla: tag. Reference: is for other references, e.g. the referenced bug is related to the patch at hand somehow, but this does not fix the bug. BR, Jani. > Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx> > --- > drivers/gpu/drm/i915/i915_drv.h | 1 + > drivers/gpu/drm/i915/intel_audio.c | 2 +- > drivers/gpu/drm/i915/intel_device_info.c | 2 ++ > 3 files changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h > index 770305b..6229ff8 100644 > --- a/drivers/gpu/drm/i915/i915_drv.h > +++ b/drivers/gpu/drm/i915/i915_drv.h > @@ -868,6 +868,7 @@ struct intel_device_info { > u8 num_pipes; > u8 num_sprites[I915_MAX_PIPES]; > u8 num_scalers[I915_MAX_PIPES]; > + u8 max_pipes; > > unsigned int page_sizes; /* page sizes supported by the HW */ > > diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c > index 0ddba16..147bd3d 100644 > --- a/drivers/gpu/drm/i915/intel_audio.c > +++ b/drivers/gpu/drm/i915/intel_audio.c > @@ -754,7 +754,7 @@ static struct intel_encoder *get_saved_enc(struct drm_i915_private *dev_priv, > { > struct intel_encoder *encoder; > > - if (WARN_ON(pipe >= INTEL_INFO(dev_priv)->num_pipes)) > + if (WARN_ON(pipe >= INTEL_INFO(dev_priv)->max_pipes)) > return NULL; > > /* MST */ > diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c > index 875d428..ba1a807 100644 > --- a/drivers/gpu/drm/i915/intel_device_info.c > +++ b/drivers/gpu/drm/i915/intel_device_info.c > @@ -376,6 +376,8 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv) > info->num_sprites[pipe] = 1; > } > > + info->max_pipes = info->num_pipes; > + > if (i915_modparams.disable_display) { > DRM_INFO("Display disabled (module parameter)\n"); > info->num_pipes = 0; -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
