On Sun, 19 Aug 2012 21:12:38 +0200 Daniel Vetter <[email protected]> wrote:
> This is the first tiny step towards cross-checking the entire modeset > state machine with WARNs. A crtc can only be enabled when it's > actually in use, i.e. crtc->active imlies crtc->enabled. > > Unfortunately we can't (yet) check this when disabling the crtc, > because the crtc helpers are a bit slopy with updating state and > unconditionally update crtc->enabled before changing the hw state. > > Fixing that requires quite some more work. > > Signed-Off-by: Daniel Vetter <[email protected]> > --- > drivers/gpu/drm/i915/intel_display.c | 4 ++++ > drivers/gpu/drm/i915/intel_drv.h | 10 +++++++++- > 2 files changed, 13 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/intel_display.c > b/drivers/gpu/drm/i915/intel_display.c > index ca17010..5ab8694 100644 > --- a/drivers/gpu/drm/i915/intel_display.c > +++ b/drivers/gpu/drm/i915/intel_display.c > @@ -3215,6 +3215,8 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc) > u32 temp; > bool is_pch_port; > > + WARN_ON(!crtc->enabled); > + > /* XXX: For compatability with the crtc helper code, call the encoder's > * enable function unconditionally for now. */ > if (intel_crtc->active) > @@ -3391,6 +3393,8 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc) > int pipe = intel_crtc->pipe; > int plane = intel_crtc->plane; > > + WARN_ON(!crtc->enabled); > + > /* XXX: For compatability with the crtc helper code, call the encoder's > * enable function unconditionally for now. */ > if (intel_crtc->active) > diff --git a/drivers/gpu/drm/i915/intel_drv.h > b/drivers/gpu/drm/i915/intel_drv.h > index 673e8d4..36991de 100644 > --- a/drivers/gpu/drm/i915/intel_drv.h > +++ b/drivers/gpu/drm/i915/intel_drv.h > @@ -158,7 +158,15 @@ struct intel_crtc { > enum plane plane; > u8 lut_r[256], lut_g[256], lut_b[256]; > int dpms_mode; > - bool active; /* is the crtc on? independent of the dpms mode */ > + /* > + * Whether the crtc and the connected output pipeline is active. Implies > + * that crtc->enabled is set, i.e. the current mode configuration has > + * some outputs connected to this crtc. > + * > + * Atm crtc->enabled is unconditionally updated _before_ the hw state is > + * changed, hence we can only check this when enabling the crtc. > + */ > + bool active; > bool primary_disabled; /* is the crtc obscured by a plane? */ > bool lowfreq_avail; > struct intel_overlay *overlay; Looking forward to seeing this cleaned up. Reviewed-by: Jesse Barnes <[email protected]> -- Jesse Barnes, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
