[PATCH] drm/i915: Restore HDCP DRM_INFO when with no downstream

[Sean Paul]

On Tue, Jan 30, 2018 at 09:35:34AM +0100, Daniel Vetter wrote:
> On Mon, Jan 22, 2018 at 12:55:00PM -0500, Sean Paul wrote:
> > The commit below returned earlier than before, but failed to move the
> > info message when authenticating without downstream devices. This patch
> > restores the message on authentication success.
> > 
> > Fixes: 87eb3ec818fa ("drm/i915: II stage HDCP auth for repeater only")
> > Cc: Ramalingam C <ramalingam.c at intel.com>
> > Cc: Sean Paul <seanpaul at chromium.org>
> > Cc: Jani Nikula <jani.nikula at linux.intel.com>
> > Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> > Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > Cc: intel-gfx at lists.freedesktop.org
> > Signed-off-by: Sean Paul <seanpaul at chromium.org>
> 
> DRM_INFO is rather loud (it shows up in dmesg by default), imo better to
> bikeshed this to DRM_DEBUG_KMS or similar while at it. Of course would
> need to be done for the entire file.
> 

Yeah, I figured I would get this feedback when I chose INFO :-). So in my
defense, HDCP is enabled/disabled quite infrequently and very likely never
in most distros. Further, it's really nice to know whether something went
sideways while HDCP was enabled, or perhaps corresponding to enable/disable.

All said, if this is distruptive upstream, we can carry a s/DEBUG_KMS/INFO/
patch downstream.

> Either way (i.e. if you ignore this, do it in a separate patch, or
> combined):
> 
> Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

As always, thank you for your review!

Sean

> 
> 
> > ---
> >  drivers/gpu/drm/i915/intel_hdcp.c | 5 ++---
> >  1 file changed, 2 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
> > index db9527173a1e..dd7dffd405d5 100644
> > --- a/drivers/gpu/drm/i915/intel_hdcp.c
> > +++ b/drivers/gpu/drm/i915/intel_hdcp.c
> > @@ -168,10 +168,8 @@ int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port,
> >  
> >  	/* If there are no downstream devices, we're all done. */
> >  	num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]);
> > -	if (num_downstream == 0) {
> > -		DRM_INFO("HDCP is enabled (no downstream devices)\n");
> > +	if (num_downstream == 0)
> >  		return 0;
> > -	}
> >  
> >  	ksv_fifo = kzalloc(num_downstream * DRM_HDCP_KSV_LEN, GFP_KERNEL);
> >  	if (!ksv_fifo)
> > @@ -502,6 +500,7 @@ static int intel_hdcp_auth(struct intel_digital_port *intel_dig_port,
> >  	if (repeater_present)
> >  		return intel_hdcp_auth_downstream(intel_dig_port, shim);
> >  
> > +	DRM_INFO("HDCP is enabled (no downstream devices)\n");
> >  	return 0;
> >  }
> >  
> > -- 
> > 2.16.0.rc1.238.g530d649a79-goog
> > 
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

-- 
Sean Paul, Software Engineer, Google / Chromium OS