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Wed, 19 Aug 2026 04:23:16 -0700 (PDT) Received: from hu-mahap-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3957f8b9b55sm763987a91.4.2026.08.19.04.23.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Aug 2026 04:23:16 -0700 (PDT) From: Mahadevan P Date: Wed, 19 Aug 2026 16:53:03 +0530 Subject: [PATCH] drm/msm/dpu: advertise linear-only modifiers on platforms without UBWC 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: <20260819-remove_ubwc-v1-1-5357d5cc517f@oss.qualcomm.com> X-B4-Tracking: v=1; b=H4sIABaShWoC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIzMDC0NL3aLU3Pyy1PjSpPJkXQNDC4OUtCQjSwOLZCWgjoKi1LTMCrBp0bG 1tQALDeADXQAAAA== X-Change-ID: 20260819-remove_ubwc-0180dfb2908c To: Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Mahadevan P X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; 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On such targets, advertising DRM_FORMAT_MOD_QCOM_COMPRESSED in the supported modifier list causes userspace to attempt UBWC allocations that the kernel rejects: msm_dpu: [drm] *ERROR* unsupported format modifier 500000000000003 msm_dpu: [drm] *ERROR* unsupported pixel format: AR24 little-endian On platforms without UBWC, only advertise DRM_FORMAT_MOD_LINEAR to avoid exposing formats that the hardware cannot handle. Fixes: 71c5c23be874 ("drm/msm/dpu: check ubwc support before adding compres= sed formats") Signed-off-by: Mahadevan P --- drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/ms= m/disp/dpu1/dpu_plane.c index 7b92082d35a6..c8bd034690cb 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c @@ -94,6 +94,11 @@ static const uint64_t supported_format_modifiers[] =3D { DRM_FORMAT_MOD_INVALID }; =20 +static const uint64_t supported_format_modifiers_no_ubwc[] =3D { + DRM_FORMAT_MOD_LINEAR, + DRM_FORMAT_MOD_INVALID +}; + #define to_dpu_plane(x) container_of(x, struct dpu_plane, base) =20 static struct dpu_kms *_dpu_plane_get_kms(struct drm_plane *plane) @@ -1836,7 +1841,10 @@ static struct drm_plane *dpu_plane_init_common(struc= t drm_device *dev, pdpu =3D drmm_universal_plane_alloc(dev, struct dpu_plane, base, 0xff, &dpu_plane_funcs, format_list, num_formats, - supported_format_modifiers, type, NULL); + (kms->mdss->ubwc_enc_version =3D=3D 0) ? + supported_format_modifiers_no_ubwc : + supported_format_modifiers, + type, NULL); if (IS_ERR(pdpu)) return ERR_CAST(pdpu); =20 --- base-commit: e6664f2b33db9b6811eb4cec109f06cb2b4f458d change-id: 20260819-remove_ubwc-0180dfb2908c Best regards, --=20 Mahadevan P