[Intel-gfx] [PATCH RESEND 9/9] drm/i915: set proper N/M in modeset

[Yang, Libin]

Hi Jani,

> -----Original Message-----
> From: Nikula, Jani
> Sent: Thursday, October 20, 2016 7:35 PM
> To: Yang, Libin <libin.yang at intel.com>; Lin, Mengdong
> <mengdong.lin at intel.com>; intel-gfx at lists.freedesktop.org
> Cc: libin.yang at linux.intel.com; Pandiyan, Dhinakaran
> <dhinakaran.pandiyan at intel.com>; Zhang, Keqiao
> <keqiao.zhang at intel.com>; Zhao, Juan J <juan.j.zhao at intel.com>
> Subject: RE: [Intel-gfx] [PATCH RESEND 9/9] drm/i915: set proper N/M in
> modeset
> 
> On Thu, 20 Oct 2016, "Yang, Libin" <libin.yang at intel.com> wrote:
> >> >> Any particular reason these M/N values are half of what they're in
> >> >> table
> >> >> 2-104 of DP 1.4 spec? (Admittedly the table is an informative
> >> >> example.)
> >> >
> >> > For HDMI, we found only set N is enough. HW then can handle the
> >> remaining.
> >>
> >> I meant, the M and N values in this part of the dp_aud_n_m table are
> >> 1/2 of what they are in the DP spec table. Why?
> >
> > Which table are you meaning? I calculate the values myself. I didn't
> > find the full table in DP spec. I only find the table for 270MHz and
> > 162MHz in Table 2-50: Examples of Maud and Naud Values
> 
> Table 2-104 in DP 1.4. Maybe you're looking at an older version of the spec.

I was referring DP1.2. I don't have DP 1.4 spec on hand. But suppose
both table should be OK?

Regards,
Libin

> 
> BR,
> Jani.
> 
> 
> --
> Jani Nikula, Intel Open Source Technology Center