From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DFD6FD3F079 for ; Wed, 28 Jan 2026 15:01:11 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 71F0B10E717; Wed, 28 Jan 2026 15:01:08 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="jBtDroSL"; dkim-atps=neutral Received: from mail-pf1-f171.google.com (mail-pf1-f171.google.com [209.85.210.171]) by gabe.freedesktop.org (Postfix) with ESMTPS id E514F10E299 for ; Wed, 28 Jan 2026 09:22:23 +0000 (UTC) Received: by mail-pf1-f171.google.com with SMTP id d2e1a72fcca58-823210d1d8eso2532545b3a.1 for ; Wed, 28 Jan 2026 01:22:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1769592143; x=1770196943; darn=lists.freedesktop.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=/20MeRTWa/ulLtC3Qbnsogn/fAwzsjqDT77al9NCJDw=; b=jBtDroSLEx/gOLoA5ZD/vBTrssOR4eKr/perq5qnYxLrgFj93tVXkQzlF/UZ8CQjDL Mcrm99007KLxDZ4ee2AF0wpZ6pc9/MwAuv1H1TP2MWyC3meIJKueVZlCIGlU8pQ1+nfC fnx2mbPEGX0qpm3KWFO9Rt9qlENxy8+XlBedYVTIPLC3y9t9N3V4SKpZ1Umf3JeS2qcV NMWQwBQkTj0Zdh6rFJ4h7XZmvf78q2/IC3wMQ9Ojax+h5fY3o0K4OaRzZeW4pE1IBw0c df9DfU5QqtEqdcJ9LlbtPqFYEOJTqYKqs/FqmNvx2Rat1ZS2Vs0e7EG13znLUhA9He62 oE1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769592143; x=1770196943; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=/20MeRTWa/ulLtC3Qbnsogn/fAwzsjqDT77al9NCJDw=; b=W4hcx3SXV/0zfE51NNzHlL+sSHWcwLQNGT7RvLmmy3vVTCy9aEspIoZGQ+JE0M4DuG qD6rDI6ExL/4LkejEWrtsbxvrEG/X23YjsctHaD7yiOhfDhr4aAgKAYMt6oYhRj1bkQk fHDMry3P7MzTMgOjCFID0c79AhO1RI1xdonGDP6dP+zU/T7lJF9xX7WMYye7luOE+5/O B/IDBsIlXKs3j23ByIUWHjz9EGpwYCdCrTYpMwdQdZgo4y6YA9CN8z3JWJBbvU375eTH WxQ69CPfl7ssurhlsNljlomkzEb7uYvCaRQ5/tNBn2TcO3bwkyLZqj8Sszl274w6qYHt mtdg== X-Forwarded-Encrypted: i=1; AJvYcCWWZdAvz32ET4Q1lXy6ypSrKzmi0tb2lHWtCJpc5SiHX69snReuDdC10PjJnPWybQ5n0Da+lu3OAsY=@lists.freedesktop.org X-Gm-Message-State: AOJu0Ywy/XwMUYtTM3nGdCTVXWGN/JMQ8R8EFIHmU6PyANAYmWbONE08 6rWprN2qm1DWOVOPF8zy1Pf6ZRMIlO6pIdPxEM/dH2NUh5D2KFuvX29j X-Gm-Gg: AZuq6aLAmb+EUbLLDMddHsSn2f2EhiV8hHAtMrvo/Q0NatOB3FYuXi7KYRzGUvif8XN 23XrcpxqMP4+D1yGnKnErNM3BxiU6wi1CQYtAmUNiH8cejx2GDCPMSH+Ihqt3WNuYi6sXg2v1I0 LXNtTxY+NxPbcznzhxc6rzIB1syN93e692rIfK3guwlc7G3j7ZFSP2sB8uibAwuqDs6wP8sCgp8 A0OTXEOR3tkLwugjdgv4o4AF53lR0dsfQRmaT35coCWgVdq2DK1MU/ELsk+zPuoEivhj4XrhOKh qCNa2yzqawCEow9HANekxWG3IcSYg66YRLF5/cEm3GvieLbzjtqUUv+zpKSLvWI9K/ku5ZlKqPo /4QjXGJg5DJXD9RN/4yVMsJ9H65sX3yruitgmc17t0sN6QqC4aUlSNMmDBmv9AlN75Nw2ylBc/1 F5Ot6fwU2oYDY0RRIthPCzAiXdkQ== X-Received: by 2002:a05:6a21:6b0d:b0:364:13ab:d4c5 with SMTP id adf61e73a8af0-38ec629f950mr4457135637.26.1769592143279; Wed, 28 Jan 2026 01:22:23 -0800 (PST) Received: from localhost.localdomain ([58.231.102.222]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c642b0b4c07sm1758138a12.36.2026.01.28.01.22.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Jan 2026 01:22:22 -0800 (PST) From: Waffle0823 To: andy@kernel.org Cc: gregkh@linuxfoundation.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-staging@lists.linux.dev, Waffle0823 Subject: [PATCH] fbtft: Improve damage_range to mark only changed rows Date: Wed, 28 Jan 2026 18:22:10 +0900 Message-ID: <20260128092210.864021-1-csshin9928@gmail.com> X-Mailer: git-send-email 2.52.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Wed, 28 Jan 2026 15:01:07 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Instead of marking the entire display as dirty, calculate start_row and end_row based on off/len and mark only those rows. This improves performance for partial framebuffer updates. Signed-off-by: Waffle0823 --- drivers/staging/fbtft/fbtft-core.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c index 8a5ccc8ae0a1..0fbdfdaaa94d 100644 --- a/drivers/staging/fbtft/fbtft-core.c +++ b/drivers/staging/fbtft/fbtft-core.c @@ -415,8 +415,11 @@ static void fbtft_ops_damage_range(struct fb_info *info, off_t off, size_t len) { struct fbtft_par *par = info->par; - /* TODO: only mark changed area update all for now */ - par->fbtftops.mkdirty(info, -1, 0); + __u32 width = info->var.xres; + __u32 start_row = off / width; + __u32 end_row = (off + len - 1) / width; + + par->fbtftops.mkdirty(info, start_row, end_row); } static void fbtft_ops_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height) -- 2.52.0