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Received: from DM4PR12MB6280.namprd12.prod.outlook.com (2603:10b6:8:a2::11) by DS7PR12MB6024.namprd12.prod.outlook.com (2603:10b6:8:84::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5504.19; Tue, 9 Aug 2022 15:15:48 +0000 Received: from DM4PR12MB6280.namprd12.prod.outlook.com ([fe80::b44e:8a66:63eb:e8ee]) by DM4PR12MB6280.namprd12.prod.outlook.com ([fe80::b44e:8a66:63eb:e8ee%8]) with mapi id 15.20.5525.010; Tue, 9 Aug 2022 15:15:48 +0000 Message-ID: Date: Tue, 9 Aug 2022 11:15:55 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0 Subject: Re: [PATCH v2 1/3] drm/dp_mst: add passthrough_aux to struct drm_dp_mst_port Content-Language: en-US To: Lyude Paul , linux-kernel@vger.kernel.org Cc: Harry Wentland , Fangzhi Zuo , Wayne Lin , Aurabindo Pillai , hersenxs.wu@amd.com, Leo Li , Rodrigo Siqueira , Alex Deucher , =?UTF-8?Q?Christian_K=c3=b6nig?= , "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 , =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= , Javier Martinez Canillas , Kees Cook , Imre Deak , David Zhang , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org References: <20220805211317.176672-1-hamza.mahfooz@amd.com> <8db8a726d1aac25b3590497db9cbdcc3fe161227.camel@redhat.com> From: Hamza Mahfooz In-Reply-To: <8db8a726d1aac25b3590497db9cbdcc3fe161227.camel@redhat.com> Content-Type: text/plain; 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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; > -- Hamza