From patchwork Mon Sep 21 16:55:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Guido_G=C3=BCnther?= X-Patchwork-Id: 11790517 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DE165139A for ; Mon, 21 Sep 2020 16:56:14 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id BF8092223E for ; Mon, 21 Sep 2020 16:56:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BF8092223E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=sigxcpu.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D21396E31C; Mon, 21 Sep 2020 16:56:11 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from honk.sigxcpu.org (honk.sigxcpu.org [24.134.29.49]) by gabe.freedesktop.org (Postfix) with ESMTPS id D0D1289DA8 for ; Mon, 21 Sep 2020 16:55:59 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by honk.sigxcpu.org (Postfix) with ESMTP id 0DE81FB05; Mon, 21 Sep 2020 18:55:58 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at honk.sigxcpu.org Received: from honk.sigxcpu.org ([127.0.0.1]) by localhost (honk.sigxcpu.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kXa4Z1C41mUZ; Mon, 21 Sep 2020 18:55:53 +0200 (CEST) Received: by bogon.sigxcpu.org (Postfix, from userid 1000) id 0511245678; Mon, 21 Sep 2020 18:55:53 +0200 (CEST) From: =?utf-8?q?Guido_G=C3=BCnther?= To: Thierry Reding , Sam Ravnborg , David Airlie , Daniel Vetter , Rob Herring , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v1 2/3] drm/panel: mantix: Fix panel reset Date: Mon, 21 Sep 2020 18:55:51 +0200 Message-Id: <66973d8182164fca9fc0f57970a6cd8f110759bb.1600707235.git.agx@sigxcpu.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: References: 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The mantix panel needs two reset lines (RESX and TP_RSTN) deasserted to output an image. Only deasserting RESX is not enough and the display will stay blank. Deassert in prepare() and assert in unprepare() to keep device held in reset when off. Signed-off-by: Guido Günther --- .../gpu/drm/panel/panel-mantix-mlaf057we51.c | 37 ++++++++++++------- 1 file changed, 24 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c index 4a7fbf64bb7a..29d28c63bb72 100644 --- a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c +++ b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c @@ -23,10 +23,13 @@ #define MANTIX_CMD_OTP_STOP_RELOAD_MIPI 0x41 #define MANTIX_CMD_INT_CANCEL 0x4C +#define MANTIX_NUM_RESETS 2 + struct mantix { struct device *dev; struct drm_panel panel; - struct gpio_desc *reset_gpio; + /* RESX and TP_RSTN */ + struct gpio_descs *reset_gpios; struct regulator *avdd; struct regulator *avee; @@ -122,8 +125,13 @@ static int mantix_disable(struct drm_panel *panel) static int mantix_unprepare(struct drm_panel *panel) { + DECLARE_BITMAP(asserted_values, BITS_PER_TYPE(1)); struct mantix *ctx = panel_to_mantix(panel); + gpiod_set_array_value_cansleep(ctx->reset_gpios->ndescs, + ctx->reset_gpios->desc, + ctx->reset_gpios->info, asserted_values); + regulator_disable(ctx->avee); regulator_disable(ctx->avdd); /* T11 */ @@ -137,6 +145,7 @@ static int mantix_unprepare(struct drm_panel *panel) static int mantix_prepare(struct drm_panel *panel) { + DECLARE_BITMAP(deasserted_values, BITS_PER_TYPE(0)); struct mantix *ctx = panel_to_mantix(panel); int ret; @@ -165,14 +174,11 @@ static int mantix_prepare(struct drm_panel *panel) return ret; } - /* T3+T5 */ - usleep_range(10000, 12000); - - gpiod_set_value_cansleep(ctx->reset_gpio, 1); - usleep_range(5150, 7000); - - gpiod_set_value_cansleep(ctx->reset_gpio, 0); - + /* T3 + T4 + time for voltage to become stable: */ + usleep_range(6000, 7000); + gpiod_set_array_value_cansleep(ctx->reset_gpios->ndescs, + ctx->reset_gpios->desc, + ctx->reset_gpios->info, deasserted_values); /* T6 */ msleep(50); @@ -236,10 +242,15 @@ static int mantix_probe(struct mipi_dsi_device *dsi) if (!ctx) return -ENOMEM; - ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); - if (IS_ERR(ctx->reset_gpio)) { - dev_err(dev, "cannot get reset gpio\n"); - return PTR_ERR(ctx->reset_gpio); + ctx->reset_gpios = devm_gpiod_get_array(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(ctx->reset_gpios)) { + dev_err(dev, "cannot get reset gpios\n"); + return PTR_ERR(ctx->reset_gpios); + } + + if (ctx->reset_gpios->ndescs != MANTIX_NUM_RESETS) { + dev_err(dev, "Need exactly %d reset-gpios\n", MANTIX_NUM_RESETS); + return -EINVAL; } mipi_dsi_set_drvdata(dsi, ctx);