[Intel-gfx] [RESEND FOR CI PATCH 2/2] drm/i915: Fixing eDP detection on certain platforms

[Ander Conselvan De Oliveira]

On Thu, 2016-04-21 at 16:59 -0400, Lyude wrote:
> Ping. Any chance we could get these pushed upstream soon?

They were pushed to dinq Tuesday.

Ander

> 
> On Wed, 2016-04-13 at 10:47 +0300, Ander Conselvan de Oliveira wrote:
> > From: Shubhangi Shrivastava <shubhangi.shrivastava at intel.com>
> > 
> > Since commit 30d9aa4265fe ("drm/i915: Read sink_count dpcd always"),
> > the status of a DP connector depends on its sink count value.
> > However, some eDP panels don't set that value appropriately,
> > causing them to be reported as disconnected.
> > Fix this by ignoring sink count for eDP.
> > 
> > v2: Rephrased commit message. (Ander)
> >     In case of eDP, returning status as connected if DPCD
> >     read succeeds to avoid any further operations.
> > 
> > Fixes: 30d9aa4265fe ("drm/i915: Read sink_count dpcd always")
> > Cc: Ander Conselvan De Oliveira <conselvan2 at gmail.com>
> > Cc: Jani Nikula <jani.nikula at linux.intel.com>
> > Reported-by: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
> > Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani at intel.com>
> > Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava at intel.com>
> > Tested-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> > Reviewed-by: Ander Conselvan de Oliveira <conselvan2 at gmail.com>
> > Signed-off-by: Ander Conselvan de Oliveira <
> > ander.conselvan.de.oliveira at intel.
> > com>
> > Link: 
> > http://patchwork.freedesktop.org/patch/msgid/1460444034-22320-1-git-send
> > -email-shubhangi.shrivastava at intel.com
> > ---
> >  drivers/gpu/drm/i915/intel_dp.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c
> > b/drivers/gpu/drm/i915/intel_dp.c
> > index 6c6f95a2..460c421 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -3776,7 +3776,7 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
> >  	 * downstream port information. So, an early return here saves
> >  	 * time from performing other operations which are not required.
> >  	 */
> > -	if (!intel_dp->sink_count)
> > +	if (!is_edp(intel_dp) && !intel_dp->sink_count)
> >  		return false;
> >  
> >  	/* Check if the panel supports PSR */
> > @@ -4309,6 +4309,9 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp)
> >  	if (!intel_dp_get_dpcd(intel_dp))
> >  		return connector_status_disconnected;
> >  
> > +	if (is_edp(intel_dp))
> > +		return connector_status_connected;
> > +
> >  	/* if there's no downstream port, we're done */
> >  	if (!(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT))
> >  		return connector_status_connected;
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