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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 A9799C2BB84 for ; Mon, 7 Sep 2020 16:04:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6EAD52087D for ; Mon, 7 Sep 2020 16:04:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=agner.ch header.i=@agner.ch header.b="kY1bUQBR" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730346AbgIGQE1 (ORCPT ); Mon, 7 Sep 2020 12:04:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57760 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730001AbgIGQDx (ORCPT ); Mon, 7 Sep 2020 12:03:53 -0400 Received: from mail.kmu-office.ch (mail.kmu-office.ch [IPv6:2a02:418:6a02::a2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5F125C061573 for ; Mon, 7 Sep 2020 09:03:51 -0700 (PDT) Received: from trochilidae.toradex.int (31-10-206-124.static.upc.ch [31.10.206.124]) by mail.kmu-office.ch (Postfix) with ESMTPSA id 85A7B5C05BC; Mon, 7 Sep 2020 18:03:44 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=agner.ch; s=dkim; t=1599494624; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding:in-reply-to: references; bh=CpO14UbtP2tQcbPOTl7yEqP11tbFzj3QRmh1sYkSBmQ=; b=kY1bUQBRzxxuDEzULSy5YKhMgXtt+FppllGokTl2wN7Zrr+5S2pndPiuPfCKvOMbOOTUJ6 W/LnlT5SqKQsodfi2kerN5OWY2hOdjoaTViz/spqAClFEYcHVfvnSJYzlzza08198AlZ9q xv4SMxvXhHv9zAC0dXdQIF7SfBwQqXE= From: Stefan Agner To: marex@denx.de, stefan@agner.ch Cc: laurent.pinchart@ideasonboard.com, airlied@linux.ie, daniel@ffwll.ch, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] drm: mxsfb: check framebuffer pitch Date: Mon, 7 Sep 2020 18:03:43 +0200 Message-Id: <20200907160343.124405-1-stefan@agner.ch> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The lcdif IP does not support a framebuffer pitch (stride) other than the CRTC width. Check for equality and reject the state otherwise. This prevents a distorted picture when using 640x800 and running the Mesa graphics stack. Mesa tires to use a cache aligned stride, which leads at that particular resolution to width != stride. Currently Mesa has no fallback behavior, but rejecting this configuration allows userspace to handle the issue correctly. Signed-off-by: Stefan Agner --- drivers/gpu/drm/mxsfb/mxsfb_kms.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c index b721b8b262ce..79aa14027f91 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c @@ -403,14 +403,28 @@ static int mxsfb_plane_atomic_check(struct drm_plane *plane, { struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev); struct drm_crtc_state *crtc_state; + unsigned int pitch; + int ret; crtc_state = drm_atomic_get_new_crtc_state(plane_state->state, &mxsfb->crtc); - return drm_atomic_helper_check_plane_state(plane_state, crtc_state, - DRM_PLANE_HELPER_NO_SCALING, - DRM_PLANE_HELPER_NO_SCALING, - false, true); + ret = drm_atomic_helper_check_plane_state(plane_state, crtc_state, + DRM_PLANE_HELPER_NO_SCALING, + DRM_PLANE_HELPER_NO_SCALING, + false, true); + if (ret || !plane_state->visible) + return ret; + + pitch = crtc_state->mode.hdisplay * + plane_state->fb->format->cpp[0]; + if (plane_state->fb->pitches[0] != pitch) { + dev_err(plane->dev->dev, + "Invalid pitch: fb and crtc widths must be the same"); + return -EINVAL; + } + + return 0; } static void mxsfb_plane_primary_atomic_update(struct drm_plane *plane, -- 2.28.0