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 2C2EFC433F5 for ; Tue, 12 Oct 2021 07:47:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 07D2A60F11 for ; Tue, 12 Oct 2021 07:47:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234353AbhJLHt4 (ORCPT ); Tue, 12 Oct 2021 03:49:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232541AbhJLHtz (ORCPT ); Tue, 12 Oct 2021 03:49:55 -0400 Received: from mail.kmu-office.ch (mail.kmu-office.ch [IPv6:2a02:418:6a02::a2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C56EAC061570 for ; Tue, 12 Oct 2021 00:47:53 -0700 (PDT) Received: from webmail.kmu-office.ch (unknown [IPv6:2a02:418:6a02::a3]) by mail.kmu-office.ch (Postfix) with ESMTPSA id 6BA4E5C4F33; Tue, 12 Oct 2021 09:47:52 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=agner.ch; s=dkim; t=1634024872; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=AXnTSKkY2e0B2s1iLcuJef4R1GNt3oOXcC+O+6O479E=; b=x0DCFgIAa+/3RjfWTfsgwWOzWn26jcoKH+jtrjTF5UqQpLv/uMuVMMfvIuuCCASsWusATV lAfxAGCQ177VNIOVh/1r15Djvq11iPXbhqKPxoGvGeeP81Xfln2h6NBCM5hlfxruwe25Wc TB8APEoTMhDE9Xr8lGn/VpM2AIKwa4w= MIME-Version: 1.0 Date: Tue, 12 Oct 2021 09:47:52 +0200 From: Stefan Agner To: =?UTF-8?Q?Guido_G=C3=BCnther?= Cc: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , Marek Vasut , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Thierry Reding , Sam Ravnborg , Ondrej Jirman , Lucas Stach , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v3 5/5] drm: mxsfb: Set fallback bus format when the bridge doesn't provide one In-Reply-To: <781f0352052cc50c823c199ef5f53c84902d0580.1633959458.git.agx@sigxcpu.org> References: <781f0352052cc50c823c199ef5f53c84902d0580.1633959458.git.agx@sigxcpu.org> User-Agent: Roundcube Webmail/1.4.9 Message-ID: <486b9224d93c829ef2581bc105d8abdd@agner.ch> X-Sender: stefan@agner.ch Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021-10-11 15:41, Guido Günther wrote: > If a bridge doesn't do any bus format handling MEDIA_BUS_FMT_FIXED is > returned. Fallback to a reasonable default (MEDIA_BUS_FMT_RGB888_1X24) in > that case. > > This unbreaks e.g. using mxsfb with the nwl bridge and mipi dsi panels. > > Reported-by: Martin Kepplinger > Signed-off-by: Guido Günther > Reviewed-by: Lucas Stach Acked-by: Stefan Agner > --- > drivers/gpu/drm/mxsfb/mxsfb_kms.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c > b/drivers/gpu/drm/mxsfb/mxsfb_kms.c > index d6abd2077114..e3fbb8b58d5d 100644 > --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c > +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c > @@ -369,6 +369,12 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc, > drm_atomic_get_new_bridge_state(state, > mxsfb->bridge); > bus_format = bridge_state->input_bus_cfg.format; > + if (bus_format == MEDIA_BUS_FMT_FIXED) { > + dev_warn_once(drm->dev, > + "Bridge does not provide bus format, assuming > MEDIA_BUS_FMT_RGB888_1X24.\n" > + "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n"); > + bus_format = MEDIA_BUS_FMT_RGB888_1X24; > + } > } > > /* If there is no bridge, use bus format from connector */