On Thu, Sep 19, 2013 at 10:58:36AM +0100, Damien Lespiau wrote:
> On Tue, Sep 10, 2013 at 07:36:37PM -0300, Rodrigo Vivi wrote:
> > From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
> >
> > You can't write it using the MCHBAR mirror, the write will just get
> > dropped.
> >
> > This should make us BSpec-compliant, but there's no real bug I could
> > reproduce that is fixed by this patch.
> >
> > Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
> > Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
>
> With or without the 'from' typo fixed (can be fixed later, amended
> while applying):
>
> Reviewed-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
Queued for -next, thanks for the patch.
>
> > ---
> > drivers/gpu/drm/i915/i915_reg.h | 4 ++++
> > drivers/gpu/drm/i915/intel_display.c | 10 ++++++++--
> > 2 files changed, 12 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index bcee89b..ff60945 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -1441,6 +1441,8 @@
> > * device 0 function 0's pci config register 0x44 or 0x48 and matches it in
> > * every way. It is not accessible from the CP register read instructions.
> > *
> > + * Starting form Haswell, you can't write registers using the MCHBAR mirror,
>
> 'from'
Fixed.
-Daniel
>
> > + * just read.
> > */
> > #define MCHBAR_MIRROR_BASE 0x10000
> >
> > @@ -4723,6 +4725,8 @@
> > #define GEN6_PCODE_READ_MIN_FREQ_TABLE 0x9
> > #define GEN6_PCODE_WRITE_RC6VIDS 0x4
> > #define GEN6_PCODE_READ_RC6VIDS 0x5
> > +#define GEN6_PCODE_READ_D_COMP 0x10
> > +#define GEN6_PCODE_WRITE_D_COMP 0x11
> > #define GEN6_ENCODE_RC6_VID(mv) (((mv) - 245) / 5)
> > #define GEN6_DECODE_RC6_VID(vids) (((vids) * 5) + 245)
> > #define GEN6_PCODE_DATA 0x138128
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 882da0e..3098465 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -6019,7 +6019,10 @@ void hsw_disable_lcpll(struct drm_i915_private *dev_priv,
> >
> > val = I915_READ(D_COMP);
> > val |= D_COMP_COMP_DISABLE;
> > - I915_WRITE(D_COMP, val);
> > + mutex_lock(&dev_priv->rps.hw_lock);
> > + if (sandybridge_pcode_write(dev_priv, GEN6_PCODE_WRITE_D_COMP, val))
> > + DRM_ERROR("Failed to disable D_COMP\n");
> > + mutex_unlock(&dev_priv->rps.hw_lock);
> > POSTING_READ(D_COMP);
> > ndelay(100);
> >
> > @@ -6061,7 +6064,10 @@ void hsw_restore_lcpll(struct drm_i915_private *dev_priv)
> > val = I915_READ(D_COMP);
> > val |= D_COMP_COMP_FORCE;
> > val &= ~D_COMP_COMP_DISABLE;
> > - I915_WRITE(D_COMP, val);
> > + mutex_lock(&dev_priv->rps.hw_lock);
> > + if (sandybridge_pcode_write(dev_priv, GEN6_PCODE_WRITE_D_COMP, val))
> > + DRM_ERROR("Failed to enable D_COMP\n");
> > + mutex_unlock(&dev_priv->rps.hw_lock);
> > POSTING_READ(D_COMP);
> >
> > val = I915_READ(LCPLL_CTL);
> > --
> > 1.8.1.4
> >
> > _______________________________________________
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> > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> _______________________________________________
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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