From patchwork Fri Sep 16 18:17:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagan Teki X-Patchwork-Id: 12978777 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 6C882ECAAA1 for ; Fri, 16 Sep 2022 18:19:39 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5A2A510ED80; Fri, 16 Sep 2022 18:19:33 +0000 (UTC) Received: from mail-pf1-x431.google.com (mail-pf1-x431.google.com [IPv6:2607:f8b0:4864:20::431]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5E1B610ED7D for ; Fri, 16 Sep 2022 18:18:58 +0000 (UTC) Received: by mail-pf1-x431.google.com with SMTP id 9so10892525pfz.12 for ; Fri, 16 Sep 2022 11:18:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amarulasolutions.com; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=TLVefyfl9f8OxBnZeywVyOFE3VwZP0fby31K9AwiC9o=; b=L9VBWsyOi4aAOP1N5cphFgPL5o4+5Mb7jcxx54eANBYJYxaZOj3id90llk/n4mHBXW VeMzj8PQ1jDwA5BjPoKKdS+uYu66inHXf7kdzPVostEepOeHmGec4JarxAgq9P+a12xh fQldQpr9DSSgNTmBl07lR/fo3RT8qK4aG3xRs= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=TLVefyfl9f8OxBnZeywVyOFE3VwZP0fby31K9AwiC9o=; b=VF9PVLXJVpqRd7WfrYPsEs/2OGS6/yaoxypz6ISBjxAimrlxWOReNYd4hKIkt1oeq/ GFrGK9nQG2BAKqcz43qDs3hR9k7lEVf837fetk7xJxU6rFPfBUwjp7c+5YN7FOQc9t+q XNQsgkAki83mYe4nFCcU1DrH/tB1i8RiClrYURq7utvWdBH8zaNzf9vpRYiK/neMtFeN MxAZw4aBp1YGLOqa040C35jFjyg1bNFAU2cUOmuvL/hsQh6uYdH7FpYN74EfiikKAH6z RUhWzM8DwcVFJ0+ub4FwUd9wifJYxSa6odh0ylrrr6PPjvRwzC71N+Z2wh30GLmeWqAt kbSw== X-Gm-Message-State: ACrzQf0SRG5SGIiard+DOO9KQRlDFsJxpT4Vvt2h9C/UFmZpL1lFDNsU MCU7jImIqsshxSS9cN9HcDsZqg== X-Google-Smtp-Source: AMsMyM7z03vFn453lZ+WiEUW12UgMn9NGi7NPzCBcL+U0HmYiTLPMo39cXo+vgUcEZaYlkEJ+rg0KQ== X-Received: by 2002:a63:2fc7:0:b0:42c:3683:7e50 with SMTP id v190-20020a632fc7000000b0042c36837e50mr5781542pgv.534.1663352337125; Fri, 16 Sep 2022 11:18:57 -0700 (PDT) Received: from localhost.localdomain ([2405:201:c00a:a073:ae5d:6ee4:5c2f:6733]) by smtp.gmail.com with ESMTPSA id d14-20020a17090a6a4e00b002007b60e288sm1770000pjm.23.2022.09.16.11.18.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Sep 2022 11:18:56 -0700 (PDT) From: Jagan Teki To: Andrzej Hajda , Inki Dae , Marek Szyprowski , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Frieder Schrempf , Fancy Fang , Tim Harvey , Michael Nazzareno Trimarchi , Adam Ford , Neil Armstrong , Robert Foss , Laurent Pinchart , Tommaso Merciai , Marek Vasut Subject: [PATCH v5 05/11] drm: bridge: samsung-dsim: Handle proper DSI host initialization Date: Fri, 16 Sep 2022 23:47:25 +0530 Message-Id: <20220916181731.89764-6-jagan@amarulasolutions.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220916181731.89764-1-jagan@amarulasolutions.com> References: <20220916181731.89764-1-jagan@amarulasolutions.com> 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: linux-samsung-soc@vger.kernel.org, Matteo Lisi , dri-devel@lists.freedesktop.org, NXP Linux Team , linux-amarula , linux-arm-kernel@lists.infradead.org, Jagan Teki Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" DSI host initialization handling in previous exynos dsi driver has some pitfalls. It initializes the host during host transfer() hook that is indeed not the desired call flow for I2C and any other DSI configured downstream bridges. Host transfer() is usually triggered for downstream DSI panels or bridges and I2C-configured-DSI bridges miss these host initialization as these downstream bridges use bridge operations hooks like pre_enable, and enable in order to initialize or set up the host. This patch is trying to handle the host init handler to satisfy all downstream panels and bridges. Added the DSIM_STATE_REINITIALIZED state flag to ensure that host init is also done on first cmd transfer, this helps existing DSI panels work on exynos platform (form Marek Szyprowski). v5: * none v4: * update init handling to ensure host init done on first cmd transfer v3: * none v2: * check initialized state in samsung_dsim_init v1: * keep DSI init in host transfer Signed-off-by: Marek Szyprowski Signed-off-by: Jagan Teki --- drivers/gpu/drm/bridge/samsung-dsim.c | 25 +++++++++++++++++-------- include/drm/bridge/samsung-dsim.h | 5 +++-- 2 files changed, 20 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c index eac2dc2f24ba..6d524338d4ff 100644 --- a/drivers/gpu/drm/bridge/samsung-dsim.c +++ b/drivers/gpu/drm/bridge/samsung-dsim.c @@ -1234,12 +1234,17 @@ static void samsung_dsim_disable_irq(struct samsung_dsim *dsi) disable_irq(dsi->irq); } -static int samsung_dsim_init(struct samsung_dsim *dsi) +static int samsung_dsim_init(struct samsung_dsim *dsi, unsigned int flag) { const struct samsung_dsim_driver_data *driver_data = dsi->driver_data; + if (dsi->state & flag) + return 0; + samsung_dsim_reset(dsi); - samsung_dsim_enable_irq(dsi); + + if (!(dsi->state & DSIM_STATE_INITIALIZED)) + samsung_dsim_enable_irq(dsi); if (driver_data->reg_values[RESET_TYPE] == DSIM_FUNCRST) samsung_dsim_enable_lane(dsi, BIT(dsi->lanes) - 1); @@ -1250,6 +1255,8 @@ static int samsung_dsim_init(struct samsung_dsim *dsi) samsung_dsim_set_phy_ctrl(dsi); samsung_dsim_init_link(dsi); + dsi->state |= flag; + return 0; } @@ -1269,6 +1276,10 @@ static void samsung_dsim_atomic_pre_enable(struct drm_bridge *bridge, } dsi->state |= DSIM_STATE_ENABLED; + + ret = samsung_dsim_init(dsi, DSIM_STATE_INITIALIZED); + if (ret) + return; } static void samsung_dsim_atomic_enable(struct drm_bridge *bridge, @@ -1442,12 +1453,9 @@ static ssize_t samsung_dsim_host_transfer(struct mipi_dsi_host *host, if (!(dsi->state & DSIM_STATE_ENABLED)) return -EINVAL; - if (!(dsi->state & DSIM_STATE_INITIALIZED)) { - ret = samsung_dsim_init(dsi); - if (ret) - return ret; - dsi->state |= DSIM_STATE_INITIALIZED; - } + ret = samsung_dsim_init(dsi, DSIM_STATE_REINITIALIZED); + if (ret) + return ret; ret = mipi_dsi_create_packet(&xfer.packet, msg); if (ret < 0) @@ -1637,6 +1645,7 @@ static int __maybe_unused samsung_dsim_suspend(struct device *dev) if (dsi->state & DSIM_STATE_INITIALIZED) { dsi->state &= ~DSIM_STATE_INITIALIZED; + dsi->state &= ~DSIM_STATE_REINITIALIZED; samsung_dsim_disable_clock(dsi); diff --git a/include/drm/bridge/samsung-dsim.h b/include/drm/bridge/samsung-dsim.h index 478f0291fb94..57b27d75369e 100644 --- a/include/drm/bridge/samsung-dsim.h +++ b/include/drm/bridge/samsung-dsim.h @@ -17,8 +17,9 @@ struct samsung_dsim; #define DSIM_STATE_ENABLED BIT(0) #define DSIM_STATE_INITIALIZED BIT(1) -#define DSIM_STATE_CMD_LPM BIT(2) -#define DSIM_STATE_VIDOUT_AVAILABLE BIT(3) +#define DSIM_STATE_REINITIALIZED BIT(2) +#define DSIM_STATE_CMD_LPM BIT(3) +#define DSIM_STATE_VIDOUT_AVAILABLE BIT(4) enum samsung_dsim_type { SAMSUNG_DSIM_TYPE_EXYNOS3250,