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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 42E41C4332F for ; Tue, 5 Oct 2021 07:48:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2563961350 for ; Tue, 5 Oct 2021 07:48:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230526AbhJEHuN (ORCPT ); Tue, 5 Oct 2021 03:50:13 -0400 Received: from mga18.intel.com ([134.134.136.126]:31264 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232591AbhJEHuN (ORCPT ); Tue, 5 Oct 2021 03:50:13 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10127"; a="212612147" X-IronPort-AV: E=Sophos;i="5.85,348,1624345200"; d="scan'208";a="212612147" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Oct 2021 00:48:22 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.85,348,1624345200"; d="scan'208";a="457976420" Received: from stinkbox.fi.intel.com (HELO stinkbox) ([10.237.72.171]) by orsmga002.jf.intel.com with SMTP; 05 Oct 2021 00:48:08 -0700 Received: by stinkbox (sSMTP sendmail emulation); Tue, 05 Oct 2021 10:48:07 +0300 Date: Tue, 5 Oct 2021 10:48:07 +0300 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: Thomas Zimmermann Cc: daniel@ffwll.ch, airlied@linux.ie, mripard@kernel.org, maarten.lankhorst@linux.intel.com, kernel@amanoeldawod.com, dirty.ice.hu@gmail.com, michael+lkml@stapelberg.ch, dri-devel@lists.freedesktop.org, Daniel Vetter , Maxime Ripard , stable@vger.kernel.org Subject: Re: [PATCH v2] drm/fbdev: Clamp fbdev surface size if too large Message-ID: References: <20211005070355.7680-1-tzimmermann@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20211005070355.7680-1-tzimmermann@suse.de> X-Patchwork-Hint: comment Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Tue, Oct 05, 2021 at 09:03:55AM +0200, Thomas Zimmermann wrote: > Clamp the fbdev surface size of the available maximumi height to avoid > failing to init console emulation. An example error is shown below. > > bad framebuffer height 2304, should be >= 768 && <= 768 > [drm] Initialized simpledrm 1.0.0 20200625 for simple-framebuffer.0 on minor 0 > simple-framebuffer simple-framebuffer.0: [drm] *ERROR* fbdev: Failed to setup generic emulation (ret=-22) > > This is especially a problem with drivers that have very small screen > sizes and cannot over-allocate at all. > > v2: > * reduce warning level (Ville) > > Signed-off-by: Thomas Zimmermann > Fixes: 11e8f5fd223b ("drm: Add simpledrm driver") > Reported-by: Amanoel Dawod > Reported-by: Zoltán Kővágó > Reported-by: Michael Stapelberg > Cc: Daniel Vetter > Cc: Maxime Ripard > Cc: dri-devel@lists.freedesktop.org > Cc: # v5.14+ Looks sane. Reviewed-by: Ville Syrjälä > --- > drivers/gpu/drm/drm_fb_helper.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c > index 6860223f0068..3b5661cf6c2b 100644 > --- a/drivers/gpu/drm/drm_fb_helper.c > +++ b/drivers/gpu/drm/drm_fb_helper.c > @@ -1508,6 +1508,7 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, > { > struct drm_client_dev *client = &fb_helper->client; > struct drm_device *dev = fb_helper->dev; > + struct drm_mode_config *config = &dev->mode_config; > int ret = 0; > int crtc_count = 0; > struct drm_connector_list_iter conn_iter; > @@ -1665,6 +1666,11 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, > /* Handle our overallocation */ > sizes.surface_height *= drm_fbdev_overalloc; > sizes.surface_height /= 100; > + if (sizes.surface_height > config->max_height) { > + drm_dbg_kms(dev, "Fbdev over-allocation too large; clamping height to %d\n", > + config->max_height); > + sizes.surface_height = config->max_height; > + } > > /* push down into drivers */ > ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); > -- > 2.33.0 -- Ville Syrjälä Intel