From patchwork Thu Jan 26 22:40:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Cormier X-Patchwork-Id: 647360 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3415C54EAA for ; Thu, 26 Jan 2023 22:40:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233205AbjAZWky (ORCPT ); Thu, 26 Jan 2023 17:40:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42724 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233225AbjAZWkw (ORCPT ); Thu, 26 Jan 2023 17:40:52 -0500 Received: from mail-qt1-x82f.google.com (mail-qt1-x82f.google.com [IPv6:2607:f8b0:4864:20::82f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C010F35A1 for ; Thu, 26 Jan 2023 14:40:51 -0800 (PST) Received: by mail-qt1-x82f.google.com with SMTP id v19so2621980qtq.13 for ; Thu, 26 Jan 2023 14:40:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=criticallink.com; s=google; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=7++FPNmCT11inHBtqfYJtM4/xAJgiLCvorUz1cWzIv4=; b=FfWgMmXFYEj9lPeH/Vdv0zqG9hIvMC3dzwgFaJPxJPBQ/Bl/fhkUfEOTaV64Fzy4TR QL4milXBTiVyIzRmgCFLJMQjMxFI1fXWYOI9uT/ooir+UY5FQDGo9KkaYI3vaz3v1iXc EyCoq6qPTHK1pNFQv/RSJj6ooLeQe1QU1BjuWnsmrXyltSIXYXbtK/AupdJMGD8ZP2X8 ZE/ibew4ToAU5EzVKFkfnmcLGPIr1d4Y8tAW+5vpghVyZAJ+uWORKCxp1HhhNT7LLeHR 4Kf4dv5h+c/akVW39GQ3PrMfnysFXSf04gax26PoX9/TEwPnXphQrgEPBYgWaoZbHx+6 JooA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=7++FPNmCT11inHBtqfYJtM4/xAJgiLCvorUz1cWzIv4=; b=EJSZ2edG93JYGcgm1u39dW66+9CatEh5iWbA6+yPRgdd67AVseOoEqd0z3myWJ3rsg TRN5v7OhUao4C/SC6glxtmjxj0fUPgjjz8aMh6wMPQOt07+xJ94xnIyzUJuhXpRI4GLi nPF6SEBdh5rHghAGg+o3kkzmD3rykq02wRgfWDWwueNzbbWfbnU4LyQ45BKhMplAZzUX 0E72uA4pLTAHhHi4PrCWSJG7tVg64MWokSQIRdXTAeMrPyqV8HrJBSTYLBXuqIQ0/+g9 lU4xY9tBHlyqVgQQID/qk10yON8jH1sxn7Pb9Io9BsWirKXepZfIWmOn/qWkOJg7nfS8 1g6A== X-Gm-Message-State: AFqh2kr0DwYm8538b8ilQoB74ik0VSAYkKDNExTcQomMpta8eH3ME6BG no84A7YiYz470bc92RkZSfJifQ== X-Google-Smtp-Source: AMrXdXtNzkgpHvsmeAGerw4Q2mbncA0QO3CZexfZka0EC7XsZpNsJxDhm0PKWk2L8YK7E1xkZrVDbw== X-Received: by 2002:a05:622a:178d:b0:3b6:35cb:b946 with SMTP id s13-20020a05622a178d00b003b635cbb946mr71952397qtk.14.1674772851400; Thu, 26 Jan 2023 14:40:51 -0800 (PST) Received: from [127.0.1.1] (static-72-90-70-109.syrcny.fios.verizon.net. [72.90.70.109]) by smtp.gmail.com with ESMTPSA id ek3-20020a05622a4fc300b003b68ea3d5c8sm1505678qtb.41.2023.01.26.14.40.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jan 2023 14:40:51 -0800 (PST) From: Jonathan Cormier Date: Thu, 26 Jan 2023 17:40:45 -0500 Subject: [PATCH v2 4/4] drm/bridge: tfp410: If connected, use I2C for polled HPD status. MIME-Version: 1.0 Message-Id: <20230125-tfp410_i2c-v2-4-bf22f4dcbcea@criticallink.com> References: <20230125-tfp410_i2c-v2-0-bf22f4dcbcea@criticallink.com> In-Reply-To: <20230125-tfp410_i2c-v2-0-bf22f4dcbcea@criticallink.com> To: Andrzej Hajda , Neil Armstrong , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , Rob Herring , Krzysztof Kozlowski Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Williamson , Bob Duke , Jonathan Cormier X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1511; i=jcormier@criticallink.com; h=from:subject:message-id; bh=mnMRLzTQ5OvUKpoF4H4mdtxVS/UwcOVTBoA/DdsbVck=; b=owEBbQKS/ZANAwAKAdzX/S4LNuuqAcsmYgBj0wFuvXkSsXrMPuQIuaE7dqR3P3ABer3/DA77uFMa Kse6bIOJAjMEAAEKAB0WIQT/MozqCeZtYxNnVN/c1/0uCzbrqgUCY9MBbgAKCRDc1/0uCzbrqjH0EA CuMWARBsza9msRcHworH1ssy/nFvqzq4JbkaBvAIl0CJb4diN58Mnla1QqnkkqHuSAj/Wta4K9JmJB XPBdPdsr66l2JKinBGdLAJRJHN6r0BM66hlL5RuizDJHFhfU9WgWiQsz4KoidZh/rUcm2yvODPTR2y TS+c4JA5a8mNj6EELvH+dZG3MRdgAot6HEH9yDLjUXz7kMYb5Acz1YmpfKYHnyZUP9OsKopq+iAOs/ oEB8kr36y6xylEkJfTZyHcAwKpD/5T3Nlk5FcMGQh5BrXqF9X51He1ns5V5fujw/N7Ybrhn+sAdwcB iA/w6dhTfeuyRRlyGJo7liNOUEVeu9Qx1EVE11AriFjxFxEC9muC2aVQPZT8OmU7ho9okGhDRkmA6K PI9f71y0dUHpZHPzyEoYlwAz/kEVd2U7VnPtJmA//l9AS2z/zk9gLghAMllvkkPgr5ye6khJd+v4O0 V89ebxTpges+Kbd/oyShBYwRpSh4gYTM4w+RpKg1tB/3FlTempzoX//3/QMAthGRmygseCSDjWM6UD uUoHgcxV86Dzfnn2WEyQcRS89AXv4DIF45hiPtOpLd/X/ZSgTOhpkF/50WLKHDT7X1MTEKSYjDxii2 ivTCGpZLsW6Qv3lF7PR3bbLSzeHEOmUh2MfoYtbMteNMElwBVsJsqY+PIP3g== X-Developer-Key: i=jcormier@criticallink.com; a=openpgp; fpr=FF328CEA09E66D63136754DFDCD7FD2E0B36EBAA Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Michael Williamson If the I2C bus is connected on the TFP410, then use the register status bit to determine connection state. This is needed, in particular, for polling the state when the Hot Plug detect is not connected to a controlling CPU via GPIO/IRQ lane. Signed-off-by: Michael Williamson Signed-off-by: Jonathan Cormier --- drivers/gpu/drm/bridge/ti-tfp410.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c index 41007d05d584..eeb7202452aa 100644 --- a/drivers/gpu/drm/bridge/ti-tfp410.c +++ b/drivers/gpu/drm/bridge/ti-tfp410.c @@ -28,6 +28,9 @@ #define TFP410_BIT_BSEL BIT(2) #define TFP410_BIT_DSEL BIT(3) +#define TFP410_REG_CTL_2_MODE 0x09 +#define TFP410_BIT_HTPLG BIT(1) + static const struct regmap_config tfp410_regmap_config = { .reg_bits = 8, .val_bits = 8, @@ -105,6 +108,15 @@ static enum drm_connector_status tfp410_connector_detect(struct drm_connector *connector, bool force) { struct tfp410 *dvi = drm_connector_to_tfp410(connector); + int ret; + + if (dvi->i2c) { + ret = regmap_test_bits(dvi->regmap, TFP410_REG_CTL_2_MODE, TFP410_BIT_HTPLG); + if (ret < 0) + dev_err(dvi->dev, "%s failed to read HTPLG bit : %d\n", __func__, ret); + else + return ret ? connector_status_connected : connector_status_disconnected; + } return drm_bridge_detect(dvi->next_bridge); }