linux-kernel - Re: [PATCH] i915/dp_mst: Keep AUX block running when disabling DPMS

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Message-ID: <1522709688.10101.30.camel@dk-H97M-D3H>
Date:   Mon, 2 Apr 2018 22:30:16 +0000
From:   "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@...el.com>
To:     "lyude@...hat.com" <lyude@...hat.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "ville.syrjala@...ux.intel.com" <ville.syrjala@...ux.intel.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "joonas.lahtinen@...ux.intel.com" <joonas.lahtinen@...ux.intel.com>,
        "labbott@...hat.com" <labbott@...hat.com>,
        "jani.nikula@...ux.intel.com" <jani.nikula@...ux.intel.com>,
        "Vivi, Rodrigo" <rodrigo.vivi@...el.com>
Subject: Re: [PATCH] i915/dp_mst: Keep AUX block running when disabling DPMS




On Mon, 2018-04-02 at 17:21 -0400, Lyude Paul wrote:
> While enabling/disabling DPMS before link training with MST hubs is
> perfectly valid; unfortunately disabling DPMS results in some devices
> disabling their AUX CH block as well. For SST this isn't as much of a
> problem, but for MST we need to be able to continue handling aux
> transactions even when none of the sinks are turned on since it's
> possible for us to have a single atomic commit which results in
> disabling each downstream sink, followed by subsequently re-enabling
> each sink.
> 
> If we don't do this, we'll end up stalling any pending ESI interrupts
> from the sink for up to 1ms. Unfortunately, dropping ESIs during this
> timespan makes it so that link fallback retraining for MST (which I will
> be submitting to the ML shortly) fails due to the channel EQ failure
> interrupts potentially getting dropped. Additionally, when performing a
> modeset that brings the hub status's link status from bad -> good having
> ESIs disabled for that long causes us to miss the hub's response to us
> trying to start link training as well.
> 
> Since any sink with MST is going to support DisplayPort 1.2 anyway, save
> us the hassle of trying to wait until the sink comes back up and just
> never shut the aux block down.
> 
> Signed-off-by: Lyude Paul <lyude@...hat.com>
> Cc: Laura Abbott <labbott@...hat.com>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@...el.com>
> Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Cc: stable@...r.kernel.org
> Fixes: ad260ab32a4d9 ("drm/i915/dp: Write to SET_POWER dpcd to enable MST hub.")

We've come a full circle on this one :)

1) Originally, we had disable_ddi() setting the branch power state to
D3.
2) Then "Use MST sideband message transactions for dpms control" removed
that as a bug fix for some devices. The sideband solution was chosen
over the D3_AUX_ON approach this patch takes.
3) Next, "Write to SET_POWER dpcd to enable MST hub" effectively took us
back to the original state due to a regression.
4) Now, we are calling (3) a regression and implementing D3_AUX_ON.


I guess, this combination should work for most devices. But, we should
test this on a few different MST hubs before going ahead.

-DK


> ---
>  drivers/gpu/drm/i915/intel_dp.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 62f82c4298ac..0479c377981b 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -2589,11 +2589,13 @@ void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode)
>  		return;
>  
>  	if (mode != DRM_MODE_DPMS_ON) {
> +		unsigned char data = intel_dp->is_mst ?
> +			DP_SET_POWER_D3_AUX_ON : DP_SET_POWER_D3;
> +
>  		if (downstream_hpd_needs_d0(intel_dp))
>  			return;
>  
> -		ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
> -					 DP_SET_POWER_D3);
> +		ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER, data);
>  	} else {
>  		struct intel_lspcon *lspcon = dp_to_lspcon(intel_dp);
>