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Thu, 05 Nov 2026 12:12:23 -0800 (PST) Received: from localhost ([82.77.126.113]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48fecac1caesm11108369f8f.17.2026.11.05.12.12.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 12:12:22 -0800 (PST) From: Daniel Matyas To: dri-devel@lists.freedesktop.org Cc: Daniel Matyas , linux-staging@lists.linux.dev, Andy Shevchenko , Greg Kroah-Hartman , Alex Lanzano , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Nam Cao , linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org Subject: [RFC] staging: fbtft: Moving fb_ili9341 (and others) to DRM Date: Thu, 5 Nov 2026 22:11:53 +0200 Message-ID: <20261105201154.37294-2-matyasdaniel006@gmail.com> X-Mailer: git-send-email 2.55.0 X-Archived-By: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261105_121229_368996_305AA64F X-CRM114-Status: GOOD ( 12.36 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Hi, I'm looking at the fbtft TODO (convert drivers to DRM) and want to check whether fb_ili9341 can be dropped. Findings against v7.4-rc1: 1. fb_ili9341's init sequence is the MI0283QT-9A one. Comparing register writes with drivers/gpu/drm/tiny/mi0283qt.c, the values are identical, including the default gamma tables. Differences I found: - mi0283qt writes EN3GAM (0xF2) = 0x08; the fbtft write is commented out. - mi0283qt always sets MADCTL BGR; fbtft makes it configurable (bgr=). - fbtft rotate=270 also sets ML; mi0283qt does not. - Rotation maps as DRM rotation = fbtft rotate - 90 (mod 360). - fbtft also offers runtime gamma adjustment. 2. fb_ili9341 registers the compatible "ilitek,ili9341", which is also the fallback in the dt-schema binding, so it can match nodes that the DRM drivers claim via their specific compatibles. 3. In-tree users: no defconfig enables FB_TFT. canaan_kd233 (62363a8e2f56, Feb 2021) has a status = "disabled" panel node compatible with "canaan,kd233-tft", "ilitek,ili9341". It predates the first DRM driver accepting ilitek,ili9341 (5a04227326b0, Jul 2021), and none of the DRM drivers match canaan,kd233-tft. fbtft requests "dc" and "reset" GPIOs, which fits that node. I haven't tried binding it. I suppose that, if the board is used, then it is built against the fbtft driver. 4. fb_ili9341 has had only style/mechanical changes in recent years. Questions: a) Is removing fb_ili9341 acceptable, pointing users of other ILI9341 modules to panel-mipi-dbi? The KD233 node would then have no driver. b) Or should KD233 panel support go into a DRM driver first? I don't have its init sequence or physical size, or the board... c) Is removal of all of fbtft already planned? d) Several other fbtft drivers have drm counterparts. Should I inspect those to see if removal is needed? I have not tested on hardware. Thanks, Daniel M _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv