From patchwork Mon Nov 16 13:53:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 324866 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=-12.7 required=3.0 tests=BAYES_00, 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 3F4DAC64E7A for ; Mon, 16 Nov 2020 13:53:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 16523241A4 for ; Mon, 16 Nov 2020 13:53:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729471AbgKPNxh (ORCPT ); Mon, 16 Nov 2020 08:53:37 -0500 Received: from relay2-d.mail.gandi.net ([217.70.183.194]:49921 "EHLO relay2-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729572AbgKPNxh (ORCPT ); Mon, 16 Nov 2020 08:53:37 -0500 X-Originating-IP: 93.34.118.233 Received: from uno.lan (93-34-118-233.ip49.fastwebnet.it [93.34.118.233]) (Authenticated sender: jacopo@jmondi.org) by relay2-d.mail.gandi.net (Postfix) with ESMTPSA id 85AE84001C; Mon, 16 Nov 2020 13:53:33 +0000 (UTC) From: Jacopo Mondi To: kieran.bingham+renesas@ideasonboard.com, laurent.pinchart+renesas@ideasonboard.com, niklas.soderlund+renesas@ragnatech.se, geert@linux-m68k.org Cc: Jacopo Mondi , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Hyun Kwon , Manivannan Sadhasivam , sergei.shtylyov@gmail.com Subject: [PATCH v5 5/8] media: i2c: max9286: Configure reverse channel amplitude Date: Mon, 16 Nov 2020 14:53:02 +0100 Message-Id: <20201116135305.81319-6-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201116135305.81319-1-jacopo+renesas@jmondi.org> References: <20201116135305.81319-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Adjust the initial reverse channel amplitude parsing from firmware interface the 'maxim,initial-reverse-channel-mV' property. This change is required for both rdacm20 and rdacm21 camera modules to be correctly probed when used in combination with the max9286 deserializer. Reviewed-by: Kieran Bingham Signed-off-by: Jacopo Mondi --- drivers/media/i2c/max9286.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c index 31e27d0f34f1..11ba047f3793 100644 --- a/drivers/media/i2c/max9286.c +++ b/drivers/media/i2c/max9286.c @@ -163,6 +163,8 @@ struct max9286_priv { unsigned int mux_channel; bool mux_open; + u32 reverse_channel_mV; + struct v4l2_ctrl_handler ctrls; struct v4l2_ctrl *pixelrate; @@ -557,10 +559,14 @@ static int max9286_notify_bound(struct v4l2_async_notifier *notifier, * All enabled sources have probed and enabled their reverse control * channels: * + * - Increase the reverse channel amplitude to compensate for the + * remote ends high threshold, if not done already * - Verify all configuration links are properly detected * - Disable auto-ack as communication on the control channel are now * stable. */ + if (priv->reverse_channel_mV < 170) + max9286_reverse_channel_setup(priv, 170); max9286_check_config_link(priv, priv->source_mask); /* @@ -967,7 +973,7 @@ static int max9286_setup(struct max9286_priv *priv) * only. This should be disabled after the mux is initialised. */ max9286_configure_i2c(priv, true); - max9286_reverse_channel_setup(priv, 170); + max9286_reverse_channel_setup(priv, priv->reverse_channel_mV); /* * Enable GMSL links, mask unused ones and autodetect link @@ -1235,6 +1241,18 @@ static int max9286_parse_dt(struct max9286_priv *priv) } of_node_put(node); + /* + * Parse the initial value of the reverse channel amplitude from + * the firmware interface. + * + * Default it to 170mV for backward compatibility with DTB that do not + * provide the property. + */ + if (of_property_read_u32(dev->of_node, + "maxim,initial-reverse-channel-mV", + &priv->reverse_channel_mV)) + priv->reverse_channel_mV = 170; + priv->route_mask = priv->source_mask; return 0;