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[94.27.194.111]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43cf245ebafsm18062796f8f.21.2026.03.30.07.21.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Mar 2026 07:21:48 -0700 (PDT) From: Timur =?UTF-8?B?S3Jpc3TDs2Y=?= To: stable@vger.kernel.org, Rosen Penev , Christian =?UTF-8?B?S8O2bmln?= Cc: Alex Deucher , "Pan, Xinhui" , David Airlie , Daniel Vetter , Harry Wentland , Leo Li , Greg Kroah-Hartman , Bin Lan , He Zhe , Vitaly Prosyak , Alex Hung , Rodrigo Siqueira , Mario Limonciello , Ray Wu , Wayne Lin , Roman Li , Eric Yang , Tony Cheng , Mauro Rossi , "open list:RADEON and AMDGPU DRM DRIVERS" , "open list:DRM DRIVERS" , open list Subject: Re: [PATCH for 6.12 3/9] drm/amd/display: Disable fastboot on DCE 6 too Date: Mon, 30 Mar 2026 16:21:46 +0200 Message-ID: <7351746.9J7NaK4W3v@timur-hyperion> In-Reply-To: <6b15401c-1fdf-4d3b-84aa-dfc47f430895@amd.com> References: <20260326234716.16723-1-rosenp@gmail.com> <2312151.9o76ZdvQCi@timur-hyperion> <6b15401c-1fdf-4d3b-84aa-dfc47f430895@amd.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On Monday, March 30, 2026 3:55:55=E2=80=AFPM Central European Summer Time C= hristian=20 K=C3=B6nig wrote: > On 3/30/26 15:16, Timur Krist=C3=B3f wrote: > > On Friday, March 27, 2026 12:47:10=E2=80=AFAM Central European Summer T= ime Rosen > > Penev>=20 > > wrote: > >> From: Timur Krist=C3=B3f > >>=20 > >> [ Upstream commit 7495962cbceb967e095233a5673ea71f3bcdee7e ] > >>=20 > >> It already didn't work on DCE 8, > >> so there is no reason to assume it would on DCE 6. > >>=20 > >> Signed-off-by: Timur Krist=C3=B3f > >> Reviewed-by: Rodrigo Siqueira > >> Reviewed-by: Alex Deucher > >> Reviewed-by: Alex Hung > >> Signed-off-by: Alex Deucher > >> Signed-off-by: Rosen Penev > >=20 > > This patch is incorrect and should not be backported. > >=20 > > (Note that the error is already fixed upstream. For stable kernels IMO > > it's > > best to drop this one.) >=20 > Is there some alternative which needs to be backported or should the old > kernel just work out of the box because we never enabled some feature > there? >=20 > Apart from that the patch set looks good to me. >=20 This patch had a typo and does the opposite of what it should, ie. it disab= les=20 eDP fastboot on DCE10 and newer instead of disabling it on DCE8 and older. The upstream fix is here: https://lists.freedesktop.org/archives/amd-gfx/2026-February/138577.html which disables eDP fastboot on DCE10 and older. >=20 > >> --- > >>=20 > >> drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c | 6 ++---- > >> 1 file changed, 2 insertions(+), 4 deletions(-) > >>=20 > >> diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c > >> b/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c index > >> df69e0cebf78..7dc99c85b8ea 100644 > >> --- a/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c > >> +++ b/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c > >> @@ -1910,10 +1910,8 @@ void dce110_enable_accelerated_mode(struct dc *= dc, > >> struct dc_state *context) > >>=20 > >> get_edp_streams(context, edp_streams, &edp_stream_num); > >>=20 > >> - // Check fastboot support, disable on DCE8 because of blank > >=20 > > screens > >=20 > >> - if (edp_num && edp_stream_num && dc->ctx->dce_version !=3D > >=20 > > DCE_VERSION_8_0 > >=20 > >> && - dc->ctx->dce_version !=3D DCE_VERSION_8_1 && > >> - dc->ctx->dce_version !=3D DCE_VERSION_8_3) { > >> + /* Check fastboot support, disable on DCE 6-8 because of blank > >=20 > > screens */ > >=20 > >> + if (edp_num && edp_stream_num && dc->ctx->dce_version < > >=20 > > DCE_VERSION_10_0) > >=20 > >> { for (i =3D 0; i < edp_num; i++) { > >>=20 > >> edp_link =3D edp_links[i]; > >> if (edp_link !=3D edp_streams[0]->link)