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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: Y2b8zJ5XmnRojqeOMbFUm8G+XpyxAeFF25uXmlaB/JGrIhDhK2WjkypW5Sv4bLgTSOCrHRVvE/VllmFv68lVPDk6SSbhzGhkabT3UiCuJe5bx3IBBvJp4rYN3f5UGZ+fvXjrANIW9hmDHzt3ByePaEMNcm/nQRi+KlCFZfkn8E2HK6ImSnjvu8W6wtHj9kPSiHfu9t8N6n8F2gp0mQ7o4PDOxqqn4Bw6f8UEN79x0Yfr2D5PrSVD9iw5MmBwK4c8dMYOeIIPhezNZ6VEufCiO9UfGlXz2duG2XP0+d0Kkl3XLpQ19A037IvDAAxwym1FX6Ovwe684Tr12zRnQAdIotxBDLhsYnZaW/QZ3yDNCwY= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: eff49c57-a566-452f-374a-08d61aaae093 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Sep 2018 01:30:25.9012 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0856 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Eric Yang [ Upstream commit 0a14544661fad1606cc96aece30b2950fd9c4c81 ] [Why] Megachip dockings accesses ddc line through display driver when installing FW. Previously, we would fail every transaction because link attached to mst branch did not have their ddc transaction type set. [How] Set ddc transaction type when mst branch is connected. Signed-off-by: Eric Yang Reviewed-by: Charlene Liu Acked-by: Harry Wentland Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/dc/core/dc_link.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/dr= m/amd/display/dc/core/dc_link.c index 2fa521812d23..0351f7dc46e3 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -497,6 +497,10 @@ static bool detect_dp( sink_caps->signal =3D SIGNAL_TYPE_DISPLAY_PORT_MST; link->type =3D dc_connection_mst_branch; =20 + dal_ddc_service_set_transaction_type( + link->ddc, + sink_caps->transaction_type); + /* * This call will initiate MST topology discovery. Which * will detect MST ports and add new DRM connector DRM --=20 2.17.1