On Wed, Jul 11, 2018 at 07:07:10PM +0000, C, Ramalingam wrote: > > > -----Original Message----- > > From: Sean Paul [mailto:seanpaul@xxxxxxxxxxxx] > > Sent: Tuesday, July 10, 2018 2:04 AM > > To: C, Ramalingam <ramalingam.c@xxxxxxxxx> > > Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx; > > daniel@xxxxxxxx; Winkler, Tomas <tomas.winkler@xxxxxxxxx>; Usyskin, > > Alexander <alexander.usyskin@xxxxxxxxx>; Shankar, Uma > > <uma.shankar@xxxxxxxxx> > > Subject: Re: [PATCH v5 09/40] drm/i915: Schedule hdcp_check_link in > > _intel_hdcp_enable > > > > On Wed, Jun 27, 2018 at 02:09:58PM +0530, Ramalingam C wrote: > > > As a preparation for making the intel_hdcp_enable as common function > > > for both HDCP1.4 and HDCP2.2, HDCP1.4 check_link scheduling is moved > > > into _intel_hdcp_enable() function. > > > > > > v3: > > > No Changes. > > > v4: > > > Style fix. > > > v5: > > > No Change. > > > > > > Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx> > > > Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx> > > > --- > > > drivers/gpu/drm/i915/intel_hdcp.c | 12 ++++++++---- > > > 1 file changed, 8 insertions(+), 4 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/i915/intel_hdcp.c > > > b/drivers/gpu/drm/i915/intel_hdcp.c > > > index 769560591aa8..4bff74b3bed0 100644 > > > --- a/drivers/gpu/drm/i915/intel_hdcp.c > > > +++ b/drivers/gpu/drm/i915/intel_hdcp.c > > > @@ -688,7 +688,7 @@ static int _intel_hdcp_enable(struct intel_connector > > *connector) > > > ret = intel_hdcp_auth(conn_to_dig_port(connector), > > > hdcp->hdcp_shim); > > > if (!ret) > > > - return 0; > > > + break; > > > > > > DRM_DEBUG_KMS("HDCP Auth failure (%d)\n", ret); > > > > > > @@ -696,7 +696,13 @@ static int _intel_hdcp_enable(struct intel_connector > > *connector) > > > _intel_hdcp_disable(connector); > > > } > > > > > > - DRM_ERROR("HDCP authentication failed (%d tries/%d)\n", tries, ret); > > > + if (i != tries) > > > + schedule_delayed_work(&hdcp->hdcp_check_work, > > > + DRM_HDCP_CHECK_PERIOD_MS); > > > > At best, this results in a duplicate scheduling when called from > > intel_hdcp_check_link(). At worst, it schedules a check when it's not supposed to > > (see the condition in intel_hdcp_check_work). > > In original HDCP1.4 implementation hdcp_check_work is scheduled at intel_hdcp_enable. > To make the intel_hdcp_enable as a common function for 1.4 and 2.2, the same > hdcp_check_work is scheduled at _intel_hdcp_enable which is enable function for HDCP1.4. > > So no real functional change with this patch. If you are mentioning the check_work is > getting scheduled before prop_work and/or hdcp_value update, check_link handles that. > Means if the hdcp value is not UNDESIRED then shim's link_check will be invoked. > > Hope I understood your concern right. I'm not sure. intel_hdcp_check_link() calls _intel_hdcp_enable(), which is now scheduling a check. So, in essence, intel_hdcp_check_work() is rescheduling itself through this call chain. Once intel_hdcp_check_link() returns in intel_hdcp_check_work(), the worker reschedules itself if the link is good, so you get a duplicate schedule. Sean > > Thanks, > Ram > > > > Sean > > > > > + else > > > + DRM_ERROR("HDCP authentication failed (%d tries/%d)\n", > > > + tries, ret); > > > + > > > return ret; > > > } > > > > > > @@ -790,8 +796,6 @@ int intel_hdcp_enable(struct intel_connector > > > *connector) > > > > > > hdcp->hdcp_value = DRM_MODE_CONTENT_PROTECTION_ENABLED; > > > schedule_work(&hdcp->hdcp_prop_work); > > > - schedule_delayed_work(&hdcp->hdcp_check_work, > > > - DRM_HDCP_CHECK_PERIOD_MS); > > > out: > > > mutex_unlock(&hdcp->hdcp_mutex); > > > return ret; > > > -- > > > 2.7.4 > > > > > > _______________________________________________ > > > dri-devel mailing list > > > dri-devel@xxxxxxxxxxxxxxxxxxxxx > > > https://lists.freedesktop.org/mailman/listinfo/dri-devel > > > > -- > > Sean Paul, Software Engineer, Google / Chromium OS -- Sean Paul, Software Engineer, Google / Chromium OS _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
