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Mon, 13 Jul 2026 05:12:13 -0700 (PDT) From: Anand Moon To: Neil Armstrong , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Mauro Carvalho Chehab , Greg Kroah-Hartman , dri-devel@lists.freedesktop.org (open list:DRM DRIVERS FOR AMLOGIC SOCS), linux-amlogic@lists.infradead.org (open list:DRM DRIVERS FOR AMLOGIC SOCS), linux-arm-kernel@lists.infradead.org (moderated list:ARM/Amlogic Meson SoC support), linux-kernel@vger.kernel.org (open list), linux-media@vger.kernel.org (open list:MESON VIDEO DECODER DRIVER FOR AMLOGIC SOCS), linux-staging@lists.linux.dev (open list:STAGING SUBSYSTEM) Cc: Anand Moon , Doruk Tan Ozturk , Nicolas Dufresne Subject: [PATCH v7 19/19] gpu: drm: meson: Fix DMA segment size limits and maximize allocation boundaries Date: Mon, 13 Jul 2026 17:37:14 +0530 Message-ID: <20260713120840.17427-20-linux.amoon@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260713120840.17427-1-linux.amoon@gmail.com> References: <20260713120840.17427-1-linux.amoon@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When importing DMABUFs exported by the Amlogic video decoder driver (meson_vdec) for hardware-accelerated rendering paths, the DMA core subsystem throws constraint validation warnings. This occurs because the display controller master device lacks explicit DMA layout configuration, causing it to fall back to a default 64KB maximum segment size limit. Address these architectural constraints during the master bind sequence: 1. Initialize and validate a 32-bit coherent DMA allocation window by invoking dma_set_mask_and_coherent() with a DMA_BIT_MASK(32) argument. 2. Maximize the contiguous scatter-gather allocation segment boundary check constraint to UINT_MAX using the dma_set_max_seg_size() helper. This guarantees that large video bitstream frame buffers can be imported and scanned out across sub-driver domains without triggering allocation warnings or page boundary splits. Cc: Nicolas Dufresne Signed-off-by: Anand Moon --- drivers/gpu/drm/meson/meson_drv.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c index 49ff9f1f16d32..899e70bca4ce2 100644 --- a/drivers/gpu/drm/meson/meson_drv.c +++ b/drivers/gpu/drm/meson/meson_drv.c @@ -202,6 +202,12 @@ static int meson_drv_bind_master(struct device *dev, bool has_components) if (IS_ERR(drm)) return PTR_ERR(drm); + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); + if (ret) + goto free_drm; + + dma_set_max_seg_size(dev, UINT_MAX); + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) { ret = -ENOMEM; -- 2.50.1