From patchwork Sat Oct 1 08:06:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagan Teki X-Patchwork-Id: 12996458 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 71F7FC433FE for ; Sat, 1 Oct 2022 08:08:29 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6119410E510; Sat, 1 Oct 2022 08:08:28 +0000 (UTC) Received: from mail-pf1-x430.google.com (mail-pf1-x430.google.com [IPv6:2607:f8b0:4864:20::430]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2D16C10E510 for ; Sat, 1 Oct 2022 08:08:25 +0000 (UTC) Received: by mail-pf1-x430.google.com with SMTP id i6so6138517pfb.2 for ; Sat, 01 Oct 2022 01:08:25 -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=Ke/kHSIUtl4EAJQ/hjOQA71nefBPkPlcvo1GhHET9E8=; b=YE7cv58N9RW4OIyM4jXxEGd5pB/yhJBnKPT2iilRqtyLVs3ajOGpJbSnDdQNhcN0ha zw12nEDF52P8edMqEgBLo/lytT4aE2iqPNOPCF6k7Ut4BVbShI8ViLQj6uF0X6xTC/Nc rSUM6jL8/Uxa72RAohk4QcF8EDYOf0CWTpiRg= 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=Ke/kHSIUtl4EAJQ/hjOQA71nefBPkPlcvo1GhHET9E8=; b=FgV2no+fuPjRzvfM7SEwATCA2X/2pUGn9fE7r7lK2coaX3vgp381Y9jn/i+UcS0Bin mvliIj5/Gr2Kk6uF57a3OzYhfMv7KHBT71s6u/Ni/OaEbGpYcifZBjaZWl7W6DIwxn3k cjRP/N1lUMBqCyG9kdsv1YT9ybeo2vhZCq55pdD4GRdb1jQgOkDBfGOO02sVTBZWNfM8 US0FV3O/qPpAYlLeePlJ10onpBbJyM/xHjO0p/PwWFVT+sFWAKPVpxOVfTQUX6iYPy34 dUySoGvNE7bHx7vrd78rpxA27vuci4HnEKu/Iqo0rcs8Q5KwSvFv45NvUXEPmgZjy3+u 90nw== X-Gm-Message-State: ACrzQf0EjnwebnYtos4GJcRpNOMkWdcq6Xvu/WhJlke23Bbzn0z2Rr7b 2yHQVNqbyrB1MUMcon8KO0Dy8w== X-Google-Smtp-Source: AMsMyM6JwRvi+Ewzv0hDAvXHAw9i9EWDyl03ectNydcJIUPmzlbehB8fAz+xeesUswLt08bzxqLnmg== X-Received: by 2002:a63:33cf:0:b0:439:f026:aab2 with SMTP id z198-20020a6333cf000000b00439f026aab2mr10713031pgz.86.1664611704758; Sat, 01 Oct 2022 01:08:24 -0700 (PDT) Received: from localhost.localdomain ([2405:201:c00a:a073:7254:4392:bc7c:c69]) by smtp.gmail.com with ESMTPSA id c194-20020a624ecb000000b005409c9d2d41sm3167041pfb.62.2022.10.01.01.08.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 01 Oct 2022 01:08:24 -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 v6 04/10] drm: bridge: samsung-dsim: Handle proper DSI host initialization Date: Sat, 1 Oct 2022 13:36:44 +0530 Message-Id: <20221001080650.1007043-5-jagan@amarulasolutions.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221001080650.1007043-1-jagan@amarulasolutions.com> References: <20221001080650.1007043-1-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). 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 2ba909ec5239..0636440e4420 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,