From patchwork Thu Nov 10 18:38:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagan Teki X-Patchwork-Id: 13039111 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 B0554C4332F for ; Thu, 10 Nov 2022 18:41:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229898AbiKJSlB (ORCPT ); Thu, 10 Nov 2022 13:41:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38044 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229586AbiKJSlA (ORCPT ); Thu, 10 Nov 2022 13:41:00 -0500 Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4908519C0B for ; Thu, 10 Nov 2022 10:40:59 -0800 (PST) Received: by mail-pf1-x42b.google.com with SMTP id m6so2922699pfb.0 for ; Thu, 10 Nov 2022 10:40:59 -0800 (PST) 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 :message-id:reply-to; bh=cVZvXXPZkH3o8/n5mzHi6c1nTPAle34qM4sMhdqWc88=; b=jDmAeelXx83ktIBmtjAf1G6RakqngtCJRi6Djy4MwTzD5zjeWU/7ReG0p+6SSJdRFk hp7V9J9n1p7fSbOPP5VIremsyx4QLf48BgW7TkFYi3pwLlghviOB7XqGc4Vqdx3UB31O Gn26OanTbMQd9rVtQZ2UmrBleoFGI/X6dLFF4= 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:message-id:reply-to; bh=cVZvXXPZkH3o8/n5mzHi6c1nTPAle34qM4sMhdqWc88=; b=Y16PuGkfVh4sReVyrss4dC2sjV8TBx74wNABg+n1nOG9iOkRYe1c+Ikv8Ay3NsCAK4 mZvdt9sHpQriCR6rHmNbVcV5oSy3R4+7dJX27TTSz0IJFuyoJX+lCtZy1L+YkyIBErrT hUW9SsYvKvmbpUutUY1x7Evgk6LqKQp5MqbErxIJekeAjsMH2slmBsfyxNd3H+xAsvQP nbjTz2O+DhoeX8v0LsvCr6ruFCPLzJ2YGBlkP0SSqtLcXxQkJIUbiICV9qZ6YZ3rEoyb l7PAOJBq1GMduuhQ5ytVpAj8sRkkuufI1IGNmkkLfp0g5P1p7+B0+G9kQ6Jiq21p9A4c sj9w== X-Gm-Message-State: ACrzQf0jN4hX33rRegAbLfV458ZGhzpN0x7pZ4FzVyj2do1R3YJwCS0u eOYPa7NEzrrWPHWOuHNHP1tYgA== X-Google-Smtp-Source: AMsMyM5CIFiOWL51bQ1P/VPqW0/2Lr8GJNhCAcOr6saOgEryMRffovI9MfVkvbMhiIUW0HXzqMTRHQ== X-Received: by 2002:a63:5650:0:b0:459:7d5f:293e with SMTP id g16-20020a635650000000b004597d5f293emr2945701pgm.602.1668105658769; Thu, 10 Nov 2022 10:40:58 -0800 (PST) Received: from localhost.localdomain ([2405:201:c00a:a809:b5a4:486a:f07:f67e]) by smtp.gmail.com with ESMTPSA id c2-20020a170903234200b001869efb722csm11635627plh.215.2022.11.10.10.40.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Nov 2022 10:40:58 -0800 (PST) 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 Cc: Matteo Lisi , dri-devel@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, NXP Linux Team , linux-amarula , Jagan Teki Subject: [PATCH v8 06/14] drm: bridge: samsung-dsim: Handle proper DSI host initialization Date: Fri, 11 Nov 2022 00:08:45 +0530 Message-Id: <20221110183853.3678209-7-jagan@amarulasolutions.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221110183853.3678209-1-jagan@amarulasolutions.com> References: <20221110183853.3678209-1-jagan@amarulasolutions.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org 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). v8, v7, v6, 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 bb1f45fd5a88..ec7e01ae02ea 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, @@ -1458,12 +1469,9 @@ 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) @@ -1653,6 +1661,7 @@ 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 b8132bf8e36f..0c5a905f3de7 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,