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Thu, 12 Feb 2026 11:26:42 -0800 (PST) Received: from luca-vm.lan ([154.61.61.58]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-483719b8e71sm20405e9.2.2026.02.12.11.26.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Feb 2026 11:26:42 -0800 (PST) From: Luca Leonardo Scorcia To: linux-mediatek@lists.infradead.org Cc: Luca Leonardo Scorcia , Chun-Kuang Hu , Philipp Zabel , David Airlie , Simona Vetter , Matthias Brugger , AngeloGioacchino Del Regno , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2] drm/mediatek: Remove all conflicting aperture devices during probe Date: Thu, 12 Feb 2026 19:22:47 +0000 Message-ID: <20260212192605.263160-1-l.scorcia@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260212_112645_868155_01D64BB7 X-CRM114-Status: GOOD ( 15.57 ) X-BeenThere: linux-mediatek@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-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org If a device has a framebuffer available it might be already used as display by simple-framebuffer or simpledrm when mediatek-drm is probed. This is actually helpful when porting to a new device as framebuffers are simple to setup in device trees and fbcon can be used to monitor the kernel boot process. When drm-mediatek loads a new fb device is initialized, however fbcon remains attached to the initial framebuffer which is no longer connected to the actual display - the early fb is never removed. We can gracefully transition from framebuffer handling to drm-managed display by calling aperture_remove_all_conflicting_devices before registering mediatek-drm. This takes care of unloading other fb devices/drivers and disconnects fbcon which then automatically reconnects to mediatekdrmfb as soon as it's available. The function is invoked just before drm_dev_register() to kick out the existing framebuffer as late as possible to reduce the time the screen is unresponsive. Signed-off-by: Luca Leonardo Scorcia --- v2: Moved the call to aperture_remove_all_conflicting_devices to right before drm_dev_register() drivers/gpu/drm/mediatek/mtk_drm_drv.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index a94c51a83261..02effd9fc698 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -4,6 +4,7 @@ * Author: YT SHEN */ +#include #include #include #include @@ -670,6 +671,10 @@ static int mtk_drm_bind(struct device *dev) if (ret < 0) goto err_free; + ret = aperture_remove_all_conflicting_devices(DRIVER_NAME); + if (ret < 0) + dev_err(dev, "Error %d while removing conflicting aperture devices", ret); + ret = drm_dev_register(drm, 0); if (ret < 0) goto err_deinit; -- 2.43.0