From patchwork Wed Sep 1 20:19:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 12470187 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 33483C432BE for ; Wed, 1 Sep 2021 20:20:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1C7A56109E for ; Wed, 1 Sep 2021 20:20:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344242AbhIAUVp (ORCPT ); Wed, 1 Sep 2021 16:21:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55388 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344083AbhIAUVo (ORCPT ); Wed, 1 Sep 2021 16:21:44 -0400 Received: from mail-pf1-x433.google.com (mail-pf1-x433.google.com [IPv6:2607:f8b0:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D5F02C061575 for ; Wed, 1 Sep 2021 13:20:46 -0700 (PDT) Received: by mail-pf1-x433.google.com with SMTP id r13so727545pff.7 for ; Wed, 01 Sep 2021 13:20:46 -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=4fpY0eLBwj2U4FLaelgRrA4nNjF8yAIZlmqv9iLR+tE=; b=FTL8M/mHaIAxpDkQl0wEW/FMv78iEhK602T4tA32+vhl2d/Mz3qWTX2fmV2pXKd8DT GMaCxAclSY6rHw5an6KgVWpz3ss37X9Lq9ZGx793GNOeM/vcTwZ2doYdePd9LnjDPFoV Sbcm8gJPraSIc2tryzRu/rsReHJAI0MvU4BdY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=4fpY0eLBwj2U4FLaelgRrA4nNjF8yAIZlmqv9iLR+tE=; b=KinCDXYLXQ8hvyEO6xm3CeKOULsbF6FnijrZRz5e+PUMYGBpzTSZKgQ+yFK8apEJPX 1YZZQ0qiOdAChhxf/Ernml3YOz6PAyIYye0ez3H+uSL2B8PjkHJBjHTXFo8uqyG0jqgd HIuuBAbv1wPg4vCfyCWT0qdWMMt794LmpWkrU0zmjsCz715ctkU0G1jOIqKm/aRVmmOQ hnHFNtze44NNqLGST4IDxzgG9Z3lU+ubKKJCHqx0Es45Uj4LBpnMpMpPIZCzXLAZhv/f dzEqRTiudLhU9GLb5ehylxb/Iz/L6jpQDkJfJY35bAHA6h8wFKmjan0JSYhubum8J0Sf iRGA== X-Gm-Message-State: AOAM530eBeIkfKs0bBKBxBLtxqzwL0NH8VY4H2IIBEvCopJeJxwJo5/8 8MXFG/oV/TGu0bT0e/oKYSV2oQ== X-Google-Smtp-Source: ABdhPJzSba4UggTnOX5p7AZGkS8aFd8DvsD7HeNoVfAzr/fT09ehlgAjJylastBFWg4sc8Cg4LnqVQ== X-Received: by 2002:a05:6a00:140e:b029:38b:c129:9f2f with SMTP id l14-20020a056a00140eb029038bc1299f2fmr1056089pfu.75.1630527646423; Wed, 01 Sep 2021 13:20:46 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:201:958b:b561:a735:e774]) by smtp.gmail.com with ESMTPSA id x15sm321178pfq.31.2021.09.01.13.20.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Sep 2021 13:20:46 -0700 (PDT) From: Douglas Anderson To: Thierry Reding , Rob Herring , Sam Ravnborg Cc: Maarten Lankhorst , linux-arm-msm@vger.kernel.org, Bjorn Andersson , Linus W , Daniel Vetter , devicetree@vger.kernel.org, Steev Klimaszewski , Thomas Zimmermann , Maxime Ripard , David Airlie , dri-devel@lists.freedesktop.org, Douglas Anderson , linux-kernel@vger.kernel.org Subject: [PATCH v3 10/16] drm/panel-simple: Non-eDP panels don't need "HPD" handling Date: Wed, 1 Sep 2021 13:19:28 -0700 Message-Id: <20210901131531.v3.10.I77d7a48df0a6585ef2cc2ff140fbe8f236a9a9f7@changeid> X-Mailer: git-send-email 2.33.0.259.gc128427fd7-goog In-Reply-To: <20210901201934.1084250-1-dianders@chromium.org> References: <20210901201934.1084250-1-dianders@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org All of the "HPD" handling added to panel-simple recently was for eDP panels. Remove it from panel-simple now that panel-simple-edp handles eDP panels. The "prepare_to_enable" delay only makes sense in the context of HPD, so remove it too. No non-eDP panels used it anyway. Signed-off-by: Douglas Anderson --- Changes in v3: - ("Non-eDP panels don't need "HPD" handling") new for v3. drivers/gpu/drm/panel/panel-simple.c | 134 +-------------------------- 1 file changed, 4 insertions(+), 130 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index dcfec124d69d..abec01d9798e 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -23,7 +23,6 @@ #include #include -#include #include #include #include @@ -92,44 +91,6 @@ struct panel_desc { */ unsigned int prepare; - /** - * @delay.hpd_absent_delay: Time to wait if HPD isn't hooked up. - * - * Add this to the prepare delay if we know Hot Plug Detect - * isn't used. - */ - unsigned int hpd_absent_delay; - - /** - * @delay.prepare_to_enable: Time between prepare and enable. - * - * The minimum time, in milliseconds, that needs to have passed - * between when prepare finished and enable may begin. If at - * enable time less time has passed since prepare finished, - * the driver waits for the remaining time. - * - * If a fixed enable delay is also specified, we'll start - * counting before delaying for the fixed delay. - * - * If a fixed prepare delay is also specified, we won't start - * counting until after the fixed delay. We can't overlap this - * fixed delay with the min time because the fixed delay - * doesn't happen at the end of the function if a HPD GPIO was - * specified. - * - * In other words: - * prepare() - * ... - * // do fixed prepare delay - * // wait for HPD GPIO if applicable - * // start counting for prepare_to_enable - * - * enable() - * // do fixed enable delay - * // enforce prepare_to_enable min time - */ - unsigned int prepare_to_enable; - /** * @delay.enable: Time for the panel to display a valid frame. * @@ -174,7 +135,6 @@ struct panel_desc { struct panel_simple { struct drm_panel base; bool enabled; - bool no_hpd; bool prepared; @@ -187,7 +147,6 @@ struct panel_simple { struct i2c_adapter *ddc; struct gpio_desc *enable_gpio; - struct gpio_desc *hpd_gpio; struct edid *edid; @@ -371,30 +330,10 @@ static int panel_simple_unprepare(struct drm_panel *panel) return 0; } -static int panel_simple_get_hpd_gpio(struct device *dev, struct panel_simple *p) -{ - int err; - - p->hpd_gpio = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN); - if (IS_ERR(p->hpd_gpio)) { - err = PTR_ERR(p->hpd_gpio); - - if (err != -EPROBE_DEFER) - dev_err(dev, "failed to get 'hpd' GPIO: %d\n", err); - - return err; - } - - return 0; -} - -static int panel_simple_prepare_once(struct panel_simple *p) +static int panel_simple_resume(struct device *dev) { - struct device *dev = p->base.dev; - unsigned int delay; + struct panel_simple *p = dev_get_drvdata(dev); int err; - int hpd_asserted; - unsigned long hpd_wait_us; panel_simple_wait(p->unprepared_time, p->desc->delay.unprepare); @@ -406,68 +345,12 @@ static int panel_simple_prepare_once(struct panel_simple *p) gpiod_set_value_cansleep(p->enable_gpio, 1); - delay = p->desc->delay.prepare; - if (p->no_hpd) - delay += p->desc->delay.hpd_absent_delay; - if (delay) - msleep(delay); - - if (p->hpd_gpio) { - if (p->desc->delay.hpd_absent_delay) - hpd_wait_us = p->desc->delay.hpd_absent_delay * 1000UL; - else - hpd_wait_us = 2000000; - - err = readx_poll_timeout(gpiod_get_value_cansleep, p->hpd_gpio, - hpd_asserted, hpd_asserted, - 1000, hpd_wait_us); - if (hpd_asserted < 0) - err = hpd_asserted; - - if (err) { - if (err != -ETIMEDOUT) - dev_err(dev, - "error waiting for hpd GPIO: %d\n", err); - goto error; - } - } + if (p->desc->delay.prepare) + msleep(p->desc->delay.prepare); p->prepared_time = ktime_get(); return 0; - -error: - gpiod_set_value_cansleep(p->enable_gpio, 0); - regulator_disable(p->supply); - p->unprepared_time = ktime_get(); - - return err; -} - -/* - * Some panels simply don't always come up and need to be power cycled to - * work properly. We'll allow for a handful of retries. - */ -#define MAX_PANEL_PREPARE_TRIES 5 - -static int panel_simple_resume(struct device *dev) -{ - struct panel_simple *p = dev_get_drvdata(dev); - int ret; - int try; - - for (try = 0; try < MAX_PANEL_PREPARE_TRIES; try++) { - ret = panel_simple_prepare_once(p); - if (ret != -ETIMEDOUT) - break; - } - - if (ret == -ETIMEDOUT) - dev_err(dev, "Prepare timeout after %d tries\n", try); - else if (try) - dev_warn(dev, "Prepare needed %d retries\n", try); - - return ret; } static int panel_simple_prepare(struct drm_panel *panel) @@ -500,8 +383,6 @@ static int panel_simple_enable(struct drm_panel *panel) if (p->desc->delay.enable) msleep(p->desc->delay.enable); - panel_simple_wait(p->prepared_time, p->desc->delay.prepare_to_enable); - p->enabled = true; return 0; @@ -674,13 +555,6 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc) panel->prepared_time = 0; panel->desc = desc; - panel->no_hpd = of_property_read_bool(dev->of_node, "no-hpd"); - if (!panel->no_hpd) { - err = panel_simple_get_hpd_gpio(dev, panel); - if (err) - return err; - } - panel->supply = devm_regulator_get(dev, "power"); if (IS_ERR(panel->supply)) return PTR_ERR(panel->supply);