From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f171.google.com (mail-pf1-f171.google.com [209.85.210.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 10525286D72 for ; Wed, 28 Jan 2026 09:22:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769592145; cv=none; b=KW2iKbHOW5kgaAZjfPPPbsIQgkL3aVNtYxTBzdMXXzHqn8+FY4dcSpLSbCHzKM6J9uOgmeu1ipuPEtJJTKhu9jVDpvSexinsqV7u5HN63Ag59B18q44f4gKP1rrvV+C8ml3iLkICggdAkHqq5uGDttBEcUkFXc2qUKIDpsblo20= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769592145; c=relaxed/simple; bh=J4xPd1IfrfMwRUhA35VU8gwe3m4oudk3ftkWf8tejlM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=lEDnVH0nVKXsTygyxbG3zEAQ5oS0pje8VAJlwjx8ZW5At7C9pU2sQN6ZoIylmDLinH5GpnscScpQXtlSdV7S6sffavGAdfRQLsP0pmZqa30HOZ/lRW1w29YA6+r+FTkVBPGp48mzQNj9Nlge/kYY7oCT0oelkcUYTe4GDo/L2ug= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Py3u5jTx; arc=none smtp.client-ip=209.85.210.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Py3u5jTx" Received: by mail-pf1-f171.google.com with SMTP id d2e1a72fcca58-81f4dfa82edso2904139b3a.0 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.linux.dev; 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=Py3u5jTxAolHSu+omjBvYPf5VF2I6fQVl9Y/d+PZuCrXkuYP2XxXH81t6CKLqzC18w hbJ4HiCz3OhLcgfjdBQd5eJBzndc36ev+TJKZVykjF2DeUkb+XaJU0WbWn/jYx8LqPOy FHPADhpxF3niG0huCn2Xi2pGI1QljBezYEGRDEor4ouFPZWVJIEByIWVelOCNXcEvbUu TzjwxDIOJbe2VcDwPyJt0wJK4gwz7+kcTHMoiKM9FDm/am6a9Nn5Bzw55lbW/XPMzxBz v54QYfsx184PG76+bUZKy/M3dKHo3x2jivT8sby6xtiavEc5i+LP+aoQxkccye/EVKOl Dpcg== 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=M8bARYLpDjDBhuA9Fn54FnGAvDh5/t6J7Jg1GbY9D5EuND8ioJck+9ED6ehEURuXuF qmtrExI4LEpFNidxkKYfg8R8RdmpYcLtPHUBQ2cOl611BssrvHpUfOA2MfHW7uqE+d7H vpgNax+1+jDWxTq+9l2Yez179LsE32+l+6SJw1OQ3yMnoccKVHR0hnmUzQkyV2CyB+UU X+zQBbPLKw1MTDcYc8c07PfJsxI7K7qJTHNNXfn/llBNtxppNPvI8giWmujd1Atdh9Km jBa6/Z+OlhVG/Uz6uNAJlN/GJZxxCYFEEUwUHBs4D9oj79l4FiDQKr0ocmeoR1sAnA3y CLmw== X-Forwarded-Encrypted: i=1; AJvYcCX7csYv3sFxC81z76h8cIgEbvuK1FImyPfxkZpvmoiLykQBv+HgdDuZoz3u5dNyQRxu9K2eseKoU8wChlFy@lists.linux.dev X-Gm-Message-State: AOJu0YxTtCjdQYdnyoClIj166WderkwvZllK+fW7HAWO1v0k8vhtzIIJ /LBIzSCZnzFSZMZuZ2QSxdwTrfzedTWkF4EjXTSs319MpSWKg4gQHa4c X-Gm-Gg: AZuq6aJMnOaTwBTe6ApL4YDAH6zh4EWGX1tIaXznaMPPsLxuPdcyOPzU/K4yDXMgCfH LomzbxOwlVTnHcs31FXgl5pckjrNLImr+f30T2diUwsUehB2njbuQYTuH8JnRKtLV3TOJWZ8heD mY/wluxMLVJxotkIQm666RlBrQyI9cKig62NnVWvRr2O1iUxJc2GRUNMdeiyf9N2/JwggagWuPL 7gQPIR9Mcas62PrsWRdd6NPDLLuHUnrwAHj6/qeCfoBKsiw8KDajj1IvRoJyE/E9GF6x8Jr1mQa n0sB+PeMcVD0QJWS4+bOzf7iieB3/0A54Kw/W/UK7vBYhuy85LZj5ohzRbMGF2+Sc+U7b3eEgLv wMI6YECQu4jAGXR69lJRzWq7bas0WtZsiOFdIb6Ci0XJBh7ZVHr/KmUPK5+nzuyEgqi93dUToFz Fq/MycS9wYIaPFpmpNPb6xqQcbMA== 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 Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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