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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44BDDC2BA83 for ; Fri, 14 Feb 2020 18:21:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 198CA2168B for ; Fri, 14 Feb 2020 18:21:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581704505; bh=GM6SWoSqzW6VjK+HK2Fz5Drs/r7qVg46S6Jp0irKb0g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2AwwZ7GuyzzAcklCUot0LWTQoNfkMWjPmrUlviUhl7mIvEdfCPJecFJwxQS28tZKU 3ab7kJxVZa1FdxTXNPvo9LEibe2VoF4Kgv9T9uvD3TBCB9UXag2+APtopNFfNUkjn9 Y6msC40tjtCWitB07U3tFO5v/TF669WkMeRDVPgE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392410AbgBNSVk (ORCPT ); Fri, 14 Feb 2020 13:21:40 -0500 Received: from mail.kernel.org ([198.145.29.99]:52868 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730135AbgBNPtm (ORCPT ); Fri, 14 Feb 2020 10:49:42 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BC64A2086A; Fri, 14 Feb 2020 15:49:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581695382; bh=GM6SWoSqzW6VjK+HK2Fz5Drs/r7qVg46S6Jp0irKb0g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iJWSuM+3BulvVOc23Y3Xl9xyMNE3aIapePFQnrTFLwTN4h9Y9iJryQCWAGLnYTFDr jYF5sQbIJlp1MbUnVZ//7E/ryOksWIMCXafyNZtv500h5gTPgiFwn8ieRac4O4tSmA Z4U+m91TdkTu29TP99WbTUDgErxPGc/Yqf6UlchE= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Geert Uytterhoeven , =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= , Sasha Levin , dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.5 037/542] drm/mipi_dbi: Fix off-by-one bugs in mipi_dbi_blank() Date: Fri, 14 Feb 2020 10:40:29 -0500 Message-Id: <20200214154854.6746-37-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214154854.6746-1-sashal@kernel.org> References: <20200214154854.6746-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Geert Uytterhoeven [ Upstream commit 2ce18249af5a28031b3f909cfafccc88ea966c9d ] When configuring the frame memory window, the last column and row numbers are written to the column resp. page address registers. These numbers are thus one less than the actual window width resp. height. While this is handled correctly in mipi_dbi_fb_dirty() since commit 03ceb1c8dfd1e293 ("drm/tinydrm: Fix setting of the column/page end addresses."), it is not in mipi_dbi_blank(). The latter still forgets to subtract one when calculating the most significant bytes of the column and row numbers, thus programming wrong values when the display width or height is a multiple of 256. Fixes: 02dd95fe31693626 ("drm/tinydrm: Add MIPI DBI support") Signed-off-by: Geert Uytterhoeven Signed-off-by: Noralf Trønnes Link: https://patchwork.freedesktop.org/patch/msgid/20191230130604.31006-1-geert+renesas@glider.be Signed-off-by: Sasha Levin --- drivers/gpu/drm/drm_mipi_dbi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c index e34058c721bec..16bff1be4b8ac 100644 --- a/drivers/gpu/drm/drm_mipi_dbi.c +++ b/drivers/gpu/drm/drm_mipi_dbi.c @@ -367,9 +367,9 @@ static void mipi_dbi_blank(struct mipi_dbi_dev *dbidev) memset(dbidev->tx_buf, 0, len); mipi_dbi_command(dbi, MIPI_DCS_SET_COLUMN_ADDRESS, 0, 0, - (width >> 8) & 0xFF, (width - 1) & 0xFF); + ((width - 1) >> 8) & 0xFF, (width - 1) & 0xFF); mipi_dbi_command(dbi, MIPI_DCS_SET_PAGE_ADDRESS, 0, 0, - (height >> 8) & 0xFF, (height - 1) & 0xFF); + ((height - 1) >> 8) & 0xFF, (height - 1) & 0xFF); mipi_dbi_command_buf(dbi, MIPI_DCS_WRITE_MEMORY_START, (u8 *)dbidev->tx_buf, len); -- 2.20.1