[Intel-gfx] [PATCH] drm/i915/icl: MBUS B credit change

[Rodrigo Vivi]

On Fri, Oct 05, 2018 at 02:40:01PM +0530, Kumar, Mahesh wrote:
> Hi,
> 
> LGTM
> 
> Reviewed-by: Mahesh Kumar <mahesh1.kumar at intel.com>

pushed to dinq adding also the rv-b from lucas
I got offline... 

> 
> On 10/4/2018 8:48 PM, Rodrigo Vivi wrote:
> > No functional change. But just a minor change to keep
> > up with Spec, since it has changed since commit c3cc39c539d4
> > ("drm/i915/icl: program mbus during pipe enable")
> > 
> > The instructions previously said to program pipe's
> > B credit = 24 / number of pipes, which is 8 for ICL.
> > Now the spec gives us direct values independent of number
> > of pipes. Let's keep in sync.
> > 
> > Also just a reorder on fields to make easier to compare
> > against spec's sequence: A -> BW -> B.
> > 
> > Cc: Lucas De Marchi <lucas.demarchi at intel.com>
> > Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> > Cc: Mahesh Kumar <mahesh1.kumar at intel.com>
> > Cc: Arthur J Runyan <arthur.j.runyan at intel.com>
> > Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > ---
> >   drivers/gpu/drm/i915/intel_display.c | 7 +++----
> >   1 file changed, 3 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 36434c5359b1..eb2250a984a8 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -5683,10 +5683,9 @@ static void icl_pipe_mbus_enable(struct intel_crtc *crtc)
> >   	enum pipe pipe = crtc->pipe;
> >   	uint32_t val;
> > -	val = MBUS_DBOX_BW_CREDIT(1) | MBUS_DBOX_A_CREDIT(2);
> > -
> > -	/* Program B credit equally to all pipes */
> > -	val |= MBUS_DBOX_B_CREDIT(24 / INTEL_INFO(dev_priv)->num_pipes);
> > +	val = MBUS_DBOX_A_CREDIT(2);
> > +	val |= MBUS_DBOX_BW_CREDIT(1);
> > +	val |= MBUS_DBOX_B_CREDIT(8);
> >   	I915_WRITE(PIPE_MBUS_DBOX_CTL(pipe), val);
> >   }
> 
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