[Intel-gfx] [PATCH v2 1/2] drm/dp: Bit definition for D3 power state that keeps AUX fully powered

[Ville Syrjälä]

On Fri, Oct 27, 2017 at 01:25:01PM +0300, Jani Nikula wrote:
> On Mon, 14 Aug 2017, Harry Wentland <harry.wentland at amd.com> wrote:
> > On 2017-08-11 02:10 PM, Dhinakaran Pandiyan wrote:
> >> DPCD 600h - SET_POWER & SET_DP_PWR_VOLTAGE defines power state
> >> 
> >> 101 = Set Main-Link for local Sink device and all downstream Sink
> >> devices to D3 (power-down mode), keep AUX block fully powered, ready to
> >> reply within a Response Timeout period of 300us.
> >> 
> >> This state is useful in a MST dock + MST monitor configuration that
> >> doesn't wake up from D3 state.
> >> 
> >> v2: Use spaces instead of tabs (Jani)
> >> 
> >> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> >
> > Reviewed-by: Harry Wentland <harry.wentland at amd.com>
> 
> Pushed this one to drm-misc-next, thanks for the patch and review, and
> sorry for the delay.

Sorry to start reviewing after this got pushed, but...

> 
> BR,
> Jani.
> 
> >
> > Harry
> >
> >> ---
> >>  include/drm/drm_dp_helper.h | 1 +
> >>  1 file changed, 1 insertion(+)
> >> 
> >> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> >> index b17476a..47a6cdb 100644
> >> --- a/include/drm/drm_dp_helper.h
> >> +++ b/include/drm/drm_dp_helper.h
> >> @@ -618,6 +618,7 @@
> >>  # define DP_SET_POWER_D0                    0x1
> >>  # define DP_SET_POWER_D3                    0x2
> >>  # define DP_SET_POWER_MASK                  0x3

This mask doesn't cover the "aux" bit. I guess it's a purely theoretical
concern at this point since the device should start out in D0 when
first plugged in.

Also IIRC this stuff was added in DPCD 1.2. We might want a comment to
reflect that fact.

> >> +# define DP_SET_POWER_D3_AUX_ON             0x5
> >>  
> >>  #define DP_EDP_DPCD_REV			    0x700    /* eDP 1.2 */
> >>  # define DP_EDP_11			    0x00
> >> 
> > _______________________________________________
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> > Intel-gfx at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Jani Nikula, Intel Open Source Technology Center
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> Intel-gfx at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC