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 EDF89D3F07A for ; Wed, 28 Jan 2026 15:01:12 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CBFF310E718; 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="J5o2XH3H"; dkim-atps=neutral Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) by gabe.freedesktop.org (Postfix) with ESMTPS id 10F2910E628 for ; Wed, 28 Jan 2026 08:57:33 +0000 (UTC) Received: by mail-pl1-f181.google.com with SMTP id d9443c01a7336-2a0ac29fca1so49424245ad.2 for ; Wed, 28 Jan 2026 00:57:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1769590652; x=1770195452; 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=LEOJgPmuwRbV12LBE88Ol+uZDUf/K36dFJv3SsHLtYY=; b=J5o2XH3HEJ7Uf0q9OFvoqnO16Fn8Wh2zqBZL157VlPMt6+ksUrgnrLEkkixbRaWcnu b4AJY3iNJw1fwXQFToKA3M4cqQWLaxWQGX42MN7DBiQSB2dXRXqfRkaQEaxZZic6rxz2 GV3tWPNgBu8ZDIPkgumMyvMnmRplH4Kd1x3jUEeZ9Iebh/8C5ecV2/A3ca36pknw+aHN MIdz9+9ifOLlnnYOT89kJWpRxyKB4se8x4DWcfaWFHRv8w5LsKTmlBGr7YYTBm0pG2xj 4c7C2vuxAcyJggrSfSZHTdoCbi7QGkqz30mRMFw5Qqw86/LEVPtWTuWJi/+jFZ4vqgmg uwRg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769590652; x=1770195452; 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=LEOJgPmuwRbV12LBE88Ol+uZDUf/K36dFJv3SsHLtYY=; b=SdtwBn2goSDQizj678GutvmxTP0fqHlzUJjSAn7qbq/kX0/UqvpDXbap4I76BlRdFO kXnmxgHzf1AWJnlsIztlTyE6PeguqHCnuL2IiMSZ18Dvzj0C5+YsTedxV0F6zQcWsGAT p809NT/OFa6J91kpLHDuZVyZpfSL/hIXXy5l2nCsGGVj/SPlmmp5PgGFnO9pXtSM9ssG Ef2tkubUEhDPNFb5UilDQuPdOOvtmUXmeLDSBjUOoTWjc+aKkbQD2GQcG27W+z+G1BTp g97CWb31ahCJbVbED8FngLIb6o4AVx8vq2+JU/HZmsN880IgnewgEzX+e/ZqIcrCnIxy +ieQ== X-Forwarded-Encrypted: i=1; AJvYcCWXI1zv9uQlnTkGmEBsyw9ILUD2QaTveZ5vRdYniyz1KzS/T/VJUQRgmAJACzXAFvw0NeKQXOCrPU8=@lists.freedesktop.org X-Gm-Message-State: AOJu0YzTz8zOQZg+tLAut0KlI0DEh6Aw9CILxMAQ7xnoUF82JosiX8Ue MKXsVHZcTLrZNd4OXTi2Ia71thrJh4dYotjRR+ET09jYDRWKOK7Uz9Ul X-Gm-Gg: AZuq6aIyD9UwT8JHeBuFp8DBLAE9iUQ52bPpEBbUmk8dkthf6VJw6CQRUhcA6X9FW3X FwZJ7dofGYQwrxSQx9myLhPRZ6dJMI7mWUzZqv4UuQOGDV+FxGGoKei4WRn5z9QvPYW8QS55zSp 6WdTIxa88qFoY1TggtyUpZwgw8Jf0PLATar2S/bWXw/+hGd+SW2w3ipbn33ebuTNDuTYUSACvEn UC2VWpX/3Gkpm/7wvSC23izitnfzWZ+Tl9ZQvDCqTg8tMpKL2Pyoiy1lM1shV+15lWzVDYWsiMQ OjZwF/1tNdc9Ng6GHBNUQKq77dqYudtO4y+siygjZPudqDE7IyFHIl0xinscctHYCvTYWkpmghF raFMdJGzLg39DwSR9hIMX4+gbRdE3K4ZbnOVU9scJFlb7oDCSLqvPIDU1YOHspqnFzMhsunoxcF ctmSibx88HvMxBr4jvWokZmQytTg== X-Received: by 2002:a17:902:ce82:b0:2a8:7814:47ca with SMTP id d9443c01a7336-2a8781448a6mr38415535ad.0.1769590652450; Wed, 28 Jan 2026 00:57:32 -0800 (PST) Received: from localhost.localdomain ([58.231.102.222]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a88b4154fcsm16707795ad.36.2026.01.28.00.57.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Jan 2026 00:57:32 -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 17:57:20 +0900 Message-ID: <20260128085720.862399-1-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: Waffle0283 csshin9928@gmail.com --- 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