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[100.0.245.4]) by smtp.gmail.com with ESMTPSA id u18-20020a37ab12000000b006b945519488sm5268186qke.88.2022.08.09.15.01.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Aug 2022 15:01:51 -0700 (PDT) Message-ID: <3690a632acc9d5d83ae8a33dfc8b88db7fe8aebf.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 Cc: Harry Wentland , Fangzhi Zuo , Wayne Lin , Aurabindo Pillai , hersenxs.wu@amd.com, Leo Li , Rodrigo Siqueira , Alex Deucher , Christian =?ISO-8859-1?Q?K=F6nig?= , "Pan, Xinhui" , David Airlie , Daniel Vetter , Mikita Lipski , Claudio Suarez , Bhawanpreet Lakha , Roman Li , Ian Chen , Colin Ian King , Nicholas Kazlauskas , Thomas Zimmermann , Jani Nikula , Imran Khan , Ville =?ISO-8859-1?Q?Syrj=E4l=E4?= , Javier Martinez Canillas , Kees Cook , Imre Deak , David Zhang , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Date: Tue, 09 Aug 2022 18:01:49 -0400 In-Reply-To: References: <20220805211317.176672-1-hamza.mahfooz@amd.com> <8db8a726d1aac25b3590497db9cbdcc3fe161227.camel@redhat.com> Organization: Red Hat Inc. Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.4 (3.42.4-2.fc35) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Ah yes of course! Probably should have asked when I gave the r-b :). Also, just so patchwork actually catches it I will say the magic incantation: Reviewed-by: Lyude Paul Do we want to merge just this patch to drm-misc-next, or do you want to merge the whole series through there? If you'd rather just merge this through amd's branch I'm fine with that as well On Tue, 2022-08-09 at 11:15 -0400, Hamza Mahfooz wrote: > Hey Lyude, > > On 2022-08-05 17:17, Lyude Paul wrote: > > lgtm! > > > > Any chance you can apply this to drm-misc-next? > > > 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