From patchwork Mon Apr 18 16:56:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 12816958 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 33E55C433F5 for ; Mon, 18 Apr 2022 16:58:49 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 57BF610E295; Mon, 18 Apr 2022 16:58:48 +0000 (UTC) Received: from mail-pl1-x632.google.com (mail-pl1-x632.google.com [IPv6:2607:f8b0:4864:20::632]) by gabe.freedesktop.org (Postfix) with ESMTPS id 74F7510E272 for ; Mon, 18 Apr 2022 16:58:40 +0000 (UTC) Received: by mail-pl1-x632.google.com with SMTP id v12so12816843plv.4 for ; Mon, 18 Apr 2022 09:58:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Dgl5eKn4iSzXB9l06M4fwVd6TIsHNtzaSHHFv1Wa9zw=; b=BZQFA9pcqNGWWm/TFoYFFVZdh6KTVdcVLfXm/LYOkpxORHlZJkWyJzamzdep7WPyws ZJPpjlwYhKtM38pYvGQB8OV5r2gkjnNdFrinAOXarjmIh5CKSeQ/Vs4R8ZuF+eIU37zE vXeyRDrb56V0yWMcCRSp96qh6Aytunonn02UM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Dgl5eKn4iSzXB9l06M4fwVd6TIsHNtzaSHHFv1Wa9zw=; b=21/tfdEzCSCksUEYmgDrGmfpxN+B4AnWxjSqe2D1BrwQwhYgOUz9EUgj91dB+uA/QV q/i1DOkuK35GVcQX5kfmr4jNhkGug5XocXF/3L0FHj2dSa9F+hMM1e1mChiKnipDe/+h S28436Jb7LbVtGJnoTeFwPH1RXhlUTReNk7TOuTFigfFVtUiPmW9fy1ECIvWjVXDrcR8 U2uhJqJ44yecZ1REj1/Xn6fT8Kw+QOLxGSIf93CW+UsaiM1eaXzEe64dMaFyup2ASfwf HwUqjFC9kyQD81kgUuoy7OoY03qrZD/hDlTdKSyjL8dX1ZYDunbem/U/PNO6/yGQArmZ mYrw== X-Gm-Message-State: AOAM532DL2nAcRiXHT9oJI50M6fYvXw8xFnwN1de0WwrXsr3MlLH1ku7 jAF01qnbkdebPlCcG3bUhhAennqzAvO0Dqlw X-Google-Smtp-Source: ABdhPJxQVsYC/f7eoCzdIS38t+LLRJmAkBiI96AdewmBzcUliQs0YJQ/uNxYdYHYGIw1Keing25HWQ== X-Received: by 2002:a17:90a:c781:b0:1d0:c23e:5842 with SMTP id gn1-20020a17090ac78100b001d0c23e5842mr18487206pjb.182.1650301119843; Mon, 18 Apr 2022 09:58:39 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:201:94f4:f90:c59f:129b]) by smtp.gmail.com with ESMTPSA id l8-20020a17090a150800b001cbaf536a3esm17700980pja.18.2022.04.18.09.58.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Apr 2022 09:58:39 -0700 (PDT) From: Douglas Anderson To: dri-devel@lists.freedesktop.org Subject: [PATCH v2 4/4] drm/bridge: parade-ps8640: Provide wait_hpd_asserted() in struct drm_dp_aux Date: Mon, 18 Apr 2022 09:56:42 -0700 Message-Id: <20220418095557.v2.4.Ie827321ce263be52fdb8c1276f6f8cc00d78029f@changeid> X-Mailer: git-send-email 2.36.0.rc0.470.gd361397f0d-goog In-Reply-To: <20220418165642.2218514-1-dianders@chromium.org> References: <20220418165642.2218514-1-dianders@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Douglas Anderson , Sankeerth Billakanti , Philip Chen , Jonas Karlman , David Airlie , linux-kernel@vger.kernel.org, Neil Armstrong , Abhinav Kumar , Robert Foss , Stephen Boyd , Jernej Skrabec , Andrzej Hajda , Hsin-Yi Wang , Dmitry Baryshkov , Laurent Pinchart Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This implements the callback added by the patch ("drm/dp: Add wait_hpd_asserted() callback to struct drm_dp_aux"). With this change and all the two "DP AUX Endpoint" drivers changed to use wait_hpd_asserted(), we no longer need to have an long delay in the AUX transfer function. It's up to the panel code to make sure that the panel is powered now. If someone tried to call the aux transfer function without making sure the panel is powered we'll just get a normal transfer failure. We'll still keep the wait for HPD in the pre_enable() function. Though it's probably not actually needed there, this driver is used in the old mode (pre-DP AUX Endpoints) and it may be important for those cases. If nothing else, it shouldn't cause any big problems. Signed-off-by: Douglas Anderson --- Changes in v2: - Change is_hpd_asserted() to wait_hpd_asserted() drivers/gpu/drm/bridge/parade-ps8640.c | 34 ++++++++++++++++---------- 1 file changed, 21 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c index 9766cbbd62ad..2f19a8c89880 100644 --- a/drivers/gpu/drm/bridge/parade-ps8640.c +++ b/drivers/gpu/drm/bridge/parade-ps8640.c @@ -168,23 +168,30 @@ static bool ps8640_of_panel_on_aux_bus(struct device *dev) return true; } -static int ps8640_ensure_hpd(struct ps8640 *ps_bridge) +static int _ps8640_wait_hpd_asserted(struct ps8640 *ps_bridge, unsigned long wait_us) { struct regmap *map = ps_bridge->regmap[PAGE2_TOP_CNTL]; - struct device *dev = &ps_bridge->page[PAGE2_TOP_CNTL]->dev; int status; - int ret; /* * Apparently something about the firmware in the chip signals that * HPD goes high by reporting GPIO9 as high (even though HPD isn't * actually connected to GPIO9). */ - ret = regmap_read_poll_timeout(map, PAGE2_GPIO_H, status, - status & PS_GPIO9, 20 * 1000, 200 * 1000); + return regmap_read_poll_timeout(map, PAGE2_GPIO_H, status, + status & PS_GPIO9, wait_us / 10, wait_us); +} - if (ret < 0) - dev_warn(dev, "HPD didn't go high: %d\n", ret); +static int ps8640_wait_hpd_asserted(struct drm_dp_aux *aux, unsigned long wait_us) +{ + struct ps8640 *ps_bridge = aux_to_ps8640(aux); + struct device *dev = &ps_bridge->page[PAGE0_DP_CNTL]->dev; + int ret; + + pm_runtime_get_sync(dev); + ret = _ps8640_wait_hpd_asserted(ps_bridge, wait_us); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); return ret; } @@ -323,9 +330,7 @@ static ssize_t ps8640_aux_transfer(struct drm_dp_aux *aux, int ret; pm_runtime_get_sync(dev); - ret = ps8640_ensure_hpd(ps_bridge); - if (!ret) - ret = ps8640_aux_transfer_msg(aux, msg); + ret = ps8640_aux_transfer_msg(aux, msg); pm_runtime_mark_last_busy(dev); pm_runtime_put_autosuspend(dev); @@ -369,8 +374,8 @@ static int __maybe_unused ps8640_resume(struct device *dev) * Mystery 200 ms delay for the "MCU to be ready". It's unclear if * this is truly necessary since the MCU will already signal that * things are "good to go" by signaling HPD on "gpio 9". See - * ps8640_ensure_hpd(). For now we'll keep this mystery delay just in - * case. + * _ps8640_wait_hpd_asserted(). For now we'll keep this mystery delay + * just in case. */ msleep(200); @@ -406,7 +411,9 @@ static void ps8640_pre_enable(struct drm_bridge *bridge) int ret; pm_runtime_get_sync(dev); - ps8640_ensure_hpd(ps_bridge); + ret = _ps8640_wait_hpd_asserted(ps_bridge, 200 * 1000); + if (ret < 0) + dev_warn(dev, "HPD didn't go high: %d\n", ret); /* * The Manufacturer Command Set (MCS) is a device dependent interface @@ -652,6 +659,7 @@ static int ps8640_probe(struct i2c_client *client) ps_bridge->aux.name = "parade-ps8640-aux"; ps_bridge->aux.dev = dev; ps_bridge->aux.transfer = ps8640_aux_transfer; + ps_bridge->aux.wait_hpd_asserted = ps8640_wait_hpd_asserted; drm_dp_aux_init(&ps_bridge->aux); pm_runtime_enable(dev);