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[219.100.37.245]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-377a921d99bsm1580861fa.22.2025.10.17.13.00.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Oct 2025 13:01:09 -0700 (PDT) From: Vladimir Lypak Date: Fri, 17 Oct 2025 19:58:39 +0000 Subject: [PATCH 5/6] drm/msm/dpu: Require linear modifier for writeback framebuffers Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251017-b4-dpu-fixes-v1-5-40ce5993eeb6@gmail.com> References: <20251017-b4-dpu-fixes-v1-0-40ce5993eeb6@gmail.com> In-Reply-To: <20251017-b4-dpu-fixes-v1-0-40ce5993eeb6@gmail.com> To: Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , Konrad Dybcio , Kalyan Thota , Vinod Polimera , Konrad Dybcio , =?utf-8?q?Barnab=C3=A1s_Cz=C3=A9m=C3=A1n?= Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Vladimir Lypak X-Mailer: b4 0.14.2 UBWC-related register configuration for writeback is not implemented in the driver yet but there aren't any checks for non-linear modifiers in atomic_check. Thus when compressed framebuffer is attached to writeback connector it will be filled with linear image data. This patch forbids non-linear modifiers for writeback framebuffers until UBWC support for writeback is properly implemented. Fixes: 71174f362d67 ("drm/msm/dpu: move writeback's atomic_check to dpu_wri= teback.c") Signed-off-by: Vladimir Lypak Reviewed-by: Dmitry Baryshkov --- drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c b/drivers/gpu/dr= m/msm/disp/dpu1/dpu_writeback.c index cd73468e369a93c50303db2a7d4499bcb17be5d1..7545c0293efbd8f7eb34a4ac56f= 616b7cadae1c0 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_writeback.c @@ -72,6 +72,9 @@ static int dpu_wb_conn_atomic_check(struct drm_connector = *connector, DPU_ERROR("invalid fb w=3D%d, maxlinewidth=3D%u\n", fb->width, dpu_wb_conn->maxlinewidth); return -EINVAL; + } else if (fb->modifier !=3D DRM_FORMAT_MOD_LINEAR) { + DPU_ERROR("unsupported fb modifier:%#llx\n", fb->modifier); + return -EINVAL; } =20 return drm_atomic_helper_check_wb_connector_state(conn_state->connector, = conn_state->state); --=20 2.51.0