From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 719AB1F7558; Tue, 3 Dec 2024 15:08:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733238526; cv=none; b=c7b61sirRlWDB2f0GhanME+RCs0exjVVK8kNQN/VJC5pOtQexL1X8ESN5xeLuayJFkD+Q1dVNayUBA9nt3SGNljoIbUH+luEGjGcl5FeFck6gVbokLQTzshkZeQACoiOOAsRNYzgxCsUwQb+rU5Ls+WOeSpSLCVCUuDELJx/jTk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733238526; c=relaxed/simple; bh=bz4Smlbl3M6EV3uk21VckcizgiQ4jX0JE5Qw5kierhA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aJgKR1d7X67En0HyQI6mE+99jox5z70xNH7P/O2zfPAtlUdxrQh5gt1NmtIhfsVN+qV3fNjDRBxCDKoVRmDmvAcexWL0X7hKINhCGLDPN2aEeEOV7PkmdCdq22QmnWjwq+0sWTvki2/B+r12IPNpGoaNNJrSnhDANyT2SY389CQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xP/BbXnY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="xP/BbXnY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9692CC4CED6; Tue, 3 Dec 2024 15:08:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1733238526; bh=bz4Smlbl3M6EV3uk21VckcizgiQ4jX0JE5Qw5kierhA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xP/BbXnYtwWK05oebaTaL61yWu0P/4PxOhoxjRg1m7+4HVGbOv0SiKRVODdQLda8r js7XIQ+MURpufK0Vtfi0dZ4UbcbiqnDyoiNz8SsClNiARcjGS/kVU9loNy9IzFe2ab gDpxLR6bPUf9GPrPE/HCsCvK4dfzVhAHc2jg1gfE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jan Kiszka , Aradhya Bhatia , Tomi Valkeinen , Dmitry Baryshkov , Sasha Levin Subject: [PATCH 6.11 276/817] drm/bridge: tc358767: Fix link properties discovery Date: Tue, 3 Dec 2024 15:37:28 +0100 Message-ID: <20241203144006.578981392@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241203143955.605130076@linuxfoundation.org> References: <20241203143955.605130076@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tomi Valkeinen [ Upstream commit 2d343723c7e1f9f6d64f721f07cfdfc2993758d1 ] When a display controller driver uses DRM_BRIDGE_ATTACH_NO_CONNECTOR, tc358767 will behave properly and skip the creation of the connector. However, tc_get_display_props(), which is used to find out about the DP monitor and link, is only called from two places: .atomic_enable() and tc_connector_get_modes(). The latter is only used when tc358767 creates its own connector, i.e. when DRM_BRIDGE_ATTACH_NO_CONNECTOR is _not_ set. Thus, the driver never finds out the link properties before get_edid() is called. With num_lanes of 0 and link_rate of 0 there are not many valid modes... Fix this by adding tc_get_display_props() call at the beginning of get_edid(), so that we have up to date information before looking at the modes. Reported-by: Jan Kiszka Closes: https://lore.kernel.org/all/24282420-b4dd-45b3-bb1c-fc37fe4a8205@siemens.com/ Fixes: de5e6c027ae6 ("drm/bridge: tc358767: add drm_panel_bridge support") Reviewed-by: Aradhya Bhatia Tested-by: Jan Kiszka Signed-off-by: Tomi Valkeinen Link: https://patchwork.freedesktop.org/patch/msgid/20231108-tc358767-v2-2-25c5f70a2159@ideasonboard.com Signed-off-by: Dmitry Baryshkov Signed-off-by: Sasha Levin --- drivers/gpu/drm/bridge/tc358767.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index b8b7a227addfb..c4cc7f90d112c 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -1695,6 +1695,13 @@ static const struct drm_edid *tc_edid_read(struct drm_bridge *bridge, struct drm_connector *connector) { struct tc_data *tc = bridge_to_tc(bridge); + int ret; + + ret = tc_get_display_props(tc); + if (ret < 0) { + dev_err(tc->dev, "failed to read display props: %d\n", ret); + return 0; + } return drm_edid_read_ddc(connector, &tc->aux.ddc); } -- 2.43.0