linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915/skl: Fix typo in DPLL_CFGCR1 definition

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Date:	Tue, 9 Feb 2016 10:47:32 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	Lyude <cpaul@...hat.com>, Rob Clark <rclark@...hat.com>,
	David Airlie <airlied@...ux.ie>,
	Benjamin Tissoires <btissoir@...hat.com>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [Intel-gfx] [PATCH] drm/i915/skl: Fix typo in DPLL_CFGCR1
 definition

On Thu, Feb 04, 2016 at 06:11:28PM +0200, Ville Syrjälä wrote:
> On Thu, Feb 04, 2016 at 10:43:21AM -0500, Lyude wrote:
> > We accidentally point both cfgcr registers for the second shared DPLL to
> > the same location in i915_reg.h. This results in a lot of hw pipe state
> > mismatches whenever we try to do a modeset that requires allocating the
> > DPLL to a CRTC:
> > 
> > [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in dpll_hw_state.cfgcr1 (expected 0x80000168, found 0x000004a5)
> > [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in base.adjusted_mode.crtc_clock (expected 108000, found 49500)
> > [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in port_clock (expected 108000, found 49500)
> > 
> > This usually ends up causing blank monitors, since the DPLL never can
> > get set to the right clock.
> > 
> > Fixes: f0f59a00a1 ("drm/i915: Type safe register read/write")
> 
> Actually
> Fixes: 086f8e84a085 ("drm/i915: Prefix raw register defines with underscore")
> 
> That's the second regression from the type safety stuff :( I guess we
> still don't have enough testing coverage since this has gone undetected
> for so long.
> 
> Reviewed-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>

Queued for -next, thanks for the patch.
-Daniel

> 
> > Signed-off-by: Lyude <cpaul@...hat.com>
> > ---
> >  drivers/gpu/drm/i915/i915_reg.h | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index 007ae83..b9a564b 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -7514,7 +7514,7 @@ enum skl_disp_power_wells {
> >  #define  DPLL_CFGCR2_PDIV_7 (4<<2)
> >  #define  DPLL_CFGCR2_CENTRAL_FREQ_MASK	(3)
> >  
> > -#define DPLL_CFGCR1(id)	_MMIO_PIPE((id) - SKL_DPLL1, _DPLL1_CFGCR1, _DPLL2_CFGCR2)
> > +#define DPLL_CFGCR1(id)	_MMIO_PIPE((id) - SKL_DPLL1, _DPLL1_CFGCR1, _DPLL2_CFGCR1)
> >  #define DPLL_CFGCR2(id)	_MMIO_PIPE((id) - SKL_DPLL1, _DPLL1_CFGCR2, _DPLL2_CFGCR2)
> >  
> >  /* BXT display engine PLL */
> > -- 
> > 2.5.0
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@...ts.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Ville Syrjälä
> Intel OTC
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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