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[100.0.245.4]) by smtp.gmail.com with ESMTPSA id d3-20020a05620a158300b006b5e3ca6400sm3439923qkk.103.2022.08.05.14.17.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Aug 2022 14:17:48 -0700 (PDT) Message-ID: <8db8a726d1aac25b3590497db9cbdcc3fe161227.camel@redhat.com> Subject: Re: [PATCH v2 1/3] drm/dp_mst: add passthrough_aux to struct drm_dp_mst_port From: Lyude Paul To: Hamza Mahfooz , linux-kernel@vger.kernel.org Date: Fri, 05 Aug 2022 17:17:46 -0400 In-Reply-To: <20220805211317.176672-1-hamza.mahfooz@amd.com> References: <20220805211317.176672-1-hamza.mahfooz@amd.com> Organization: Red Hat Inc. 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Reviewed-by: Lyude Paul On Fri, 2022-08-05 at 17:13 -0400, Hamza Mahfooz wrote: > Currently, there is no way to identify if DSC pass-through can be > enabled and what aux DSC pass-through requests ought to be sent to. So, > add a variable to struct drm_dp_mst_port that keeps track of the > aforementioned information. > > Signed-off-by: Hamza Mahfooz > --- > v2: define DP_DSC_PASSTHROUGH_IS_SUPPORTED > --- > drivers/gpu/drm/display/drm_dp_mst_topology.c | 4 +++- > include/drm/display/drm_dp.h | 1 + > include/drm/display/drm_dp_mst_helper.h | 3 +++ > 3 files changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c > index 67b3b9697da7..71915afd9892 100644 > --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c > @@ -5921,8 +5921,10 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) > /* Enpoint decompression with DP-to-DP peer device */ > if ((endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED) && > (endpoint_fec & DP_FEC_CAPABLE) && > - (upstream_dsc & 0x2) /* DSC passthrough */) > + (upstream_dsc & DP_DSC_PASSTHROUGH_IS_SUPPORTED)) { > + port->passthrough_aux = &immediate_upstream_port->aux; > return &port->aux; > + } > > /* Virtual DPCD decompression with DP-to-DP peer device */ > return &immediate_upstream_port->aux; > diff --git a/include/drm/display/drm_dp.h b/include/drm/display/drm_dp.h > index 9e3aff7e68bb..4d0abe4c7ea9 100644 > --- a/include/drm/display/drm_dp.h > +++ b/include/drm/display/drm_dp.h > @@ -239,6 +239,7 @@ > > #define DP_DSC_SUPPORT 0x060 /* DP 1.4 */ > # define DP_DSC_DECOMPRESSION_IS_SUPPORTED (1 << 0) > +# define DP_DSC_PASSTHROUGH_IS_SUPPORTED (1 << 1) > > #define DP_DSC_REV 0x061 > # define DP_DSC_MAJOR_MASK (0xf << 0) > diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h > index 10adec068b7f..4a39c95f8afd 100644 > --- a/include/drm/display/drm_dp_mst_helper.h > +++ b/include/drm/display/drm_dp_mst_helper.h > @@ -86,6 +86,8 @@ struct drm_dp_vcpi { > * @next: link to next port on this branch device > * @aux: i2c aux transport to talk to device connected to this port, protected > * by &drm_dp_mst_topology_mgr.base.lock. > + * @passthrough_aux: parent aux to which DSC pass-through requests should be > + * sent, only set if DSC pass-through is possible. > * @parent: branch device parent of this port > * @vcpi: Virtual Channel Payload info for this port. > * @connector: DRM connector this port is connected to. Protected by > @@ -140,6 +142,7 @@ struct drm_dp_mst_port { > */ > struct drm_dp_mst_branch *mstb; > struct drm_dp_aux aux; /* i2c bus for this port? */ > + struct drm_dp_aux *passthrough_aux; > struct drm_dp_mst_branch *parent; > > struct drm_dp_vcpi vcpi; -- Cheers, Lyude Paul (she/her) Software Engineer at Red Hat