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[86.58.12.163]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43a03cfd18fsm2132231f8f.36.2026.03.12.08.43.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Mar 2026 08:43:09 -0700 (PDT) From: Jernej =?UTF-8?B?xaBrcmFiZWM=?= To: Matthias Brugger , AngeloGioacchino Del Regno , Chun-Kuang Hu , Philipp Zabel , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , David Airlie , Simona Vetter , Chen-Yu Tsai Cc: Chen-Yu Tsai , linux-sunxi@lists.linux.dev, Paul Kocialkowski , linux-mediatek@lists.infradead.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 4/4] drm/sun4i: Use backend/mixer as dedicated DMA device Date: Thu, 12 Mar 2026 16:43:07 +0100 Message-ID: <2820906.mvXUDI8C0e@jernej-laptop> In-Reply-To: <20260311094929.3393338-5-wenst@chromium.org> References: <20260311094929.3393338-1-wenst@chromium.org> <20260311094929.3393338-5-wenst@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260312_084312_699495_FD188C46 X-CRM114-Status: GOOD ( 15.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Dne sreda, 11. marec 2026 ob 10:49:28 Srednjeevropski standardni =C4=8Das j= e Chen-Yu Tsai napisal(a): > The sun4i DRM driver deals with DMA constraints in a peculiar way. > Instead of using the actual DMA device in various helpers, it justs > reconfigures the DMA constraints of the virtual display device using > the DMA device's device tree node by calling of_dma_configure(). >=20 > Turns out of_dma_configure() should only be called from bus code. > Lately this also triggers a big warning through of_iommu_configure() > and ultimately __iommu_probe_device(): >=20 > late IOMMU probe at driver bind, something fishy here! >=20 > Now that the GEM DMA helpers have proper support for allocating > and mapping buffers with a dedicated DMA device, switch over to > it as the proper solution. >=20 > The mixer change was tested on a Pine H64 model B. The backend change > was only compile tested. Though I don't expect any issues, help testing > on an older device would be appreciated. >=20 > Signed-off-by: Chen-Yu Tsai Thanks for fixing this! Acked-by: Jernej Skrabec Best regards, Jernej