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 E84ECD3F07B for ; Wed, 28 Jan 2026 15:01:13 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 046BB10E719; Wed, 28 Jan 2026 15:01:09 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="KxNd6xw+"; dkim-atps=neutral Received: from mail-pf1-f179.google.com (mail-pf1-f179.google.com [209.85.210.179]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2EEB910E6CF for ; Wed, 28 Jan 2026 13:05:18 +0000 (UTC) Received: by mail-pf1-f179.google.com with SMTP id d2e1a72fcca58-8230c839409so5549621b3a.3 for ; Wed, 28 Jan 2026 05:05:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1769605517; x=1770210317; 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=60aBumMe56xZXRD8vE8OZN2hvZkCH80+CQWsk/u8eek=; b=KxNd6xw+cpkQER5g1k0lfK33x2V910f62ib5T6MeIawXzMPdljVapS960FQuFHRnsj ZsJ60uWYYr9sg/E1v+UwZGc9+VBF5sViZueibfB1fkHaWhaf/bvyWdvmIf32Gag0yqgs LqYB1lu8epynFXGLlmjE44fSnqEdHCcoNb/7E9YPWTEIKA63P+aZKupvaL/39Q009F/g OAC1SlodRCdCXnyUiA/f1rJClMNXmJQAe/X7l1k9n4sbBhd+QxVQgbei5Bjlc7/RTaEY TKurY/10M+PL0Dg2N62+C/my/3tQWpWovZfiUfd/UjGKKfgJbCxL0BrLs4pbqlFabaRl gGWA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769605517; x=1770210317; 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=60aBumMe56xZXRD8vE8OZN2hvZkCH80+CQWsk/u8eek=; b=QVAmmjj0PGR+B8PAQ1fN+EnK1+aa3I1u//O5dv+2kBCBuGA07IeXA7+WxwaRUIq317 9J+cz8ttNxDoWSg7M0d7xFMmQeFC9cwjP8mZVTqYJh2jx2vksd2bGklT9zRiZ7VFMiQK V8gLgR5vGDAeR7iit8i29pJ+l7sFE2METSsXLSHixFReVts98/cjktwdKFjND6LVS7kK JRDWmFVhAlZnKgBgAI5XkOwAdSOt4HOi43Gymho6Xz+5Xr5WniZhcg9eSbtVZy/20qVg W++jWgd362JiC042sU205AVwPyBRYr4Aj26I2KhCredQKRc3o2ucLZnG4EF3bqIk4TJe +hEg== X-Forwarded-Encrypted: i=1; AJvYcCX7120cfokAUiCuoVkOpx7C5TNItqKjOrbXtkVOIBnOFKxoj4Pt+uQ8ogqFz6na629+J8MSEHVICjg=@lists.freedesktop.org X-Gm-Message-State: AOJu0Yz5nc0oZNh2K0THzBcI0VrvgRCI5vLs9aKdUh7EwQHmL6rKV8jU psvgkc25S6Ske2secVm2TBtkvlif/vIvxl9r+k7OMKxD5ptKFDZjmFG2 X-Gm-Gg: AZuq6aKIFLat3Tt02mbMQ3/bDqgXnCLmDLMUh6u36lvtwfmJWYwK+6QTfNRGvWBU2dK rl7iFt8Z4S/UVnMaWjCrR6oOe6chwnf1JR/er3cJQqqBjY5sqlmw5C4/lPn6uFAcqoz/NSV+yGZ CkveKciBvCMdhQz/s2YbW7gRjXDD3D+c+B3MeX5+jfI86Smcb20Zf01punBNQlviIODLd9hMRDd n0sNRBvH6AxXHtu//uRPWU3Ywsd5ZTwbwzTYpIcQ7eT1jeNOEnJPrpWsGHQgxVwdUIq+EBlwDba N5eMXFEr12iXFrHUG7TTHwRoeCWym9kv6RFT9GnCqw20IV9ITJvsDyyVSRrTsJeiAhqyOIZTTKz UZcNfVX2j+qVoG29ZhHHEuuOIfxXToJHQ1vuVcCOqoKPMcP98tgG0ggTk1zl3HDJaARkyMCpnPL GuOauBQBQF8KHiwW/j/vj77ClBQg== X-Received: by 2002:a05:6a00:9506:b0:81f:ac80:499a with SMTP id d2e1a72fcca58-82369199b5amr4580614b3a.20.1769605517452; Wed, 28 Jan 2026 05:05:17 -0800 (PST) Received: from localhost.localdomain ([58.231.102.222]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82379c50fccsm2569978b3a.60.2026.01.28.05.05.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Jan 2026 05:05:17 -0800 (PST) From: ChanSoo Shin To: andy@kernel.org Cc: gregkh@linuxfoundation.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-staging@lists.linux.dev, ChanSoo Shin Subject: [PATCH] fbtft: Improve damage_range to mark only changed rows Date: Wed, 28 Jan 2026 22:05:03 +0900 Message-ID: <20260128130503.868466-1-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: ChanSoo Shin --- 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