From patchwork Fri Jan 21 14:28:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pratyush Yadav X-Patchwork-Id: 12719802 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 D2C6FC433F5 for ; Fri, 21 Jan 2022 14:29:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1381096AbiAUO3o (ORCPT ); Fri, 21 Jan 2022 09:29:44 -0500 Received: from fllv0015.ext.ti.com ([198.47.19.141]:33466 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1381022AbiAUO3a (ORCPT ); Fri, 21 Jan 2022 09:29:30 -0500 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 20LETO0T034621; Fri, 21 Jan 2022 08:29:24 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1642775364; bh=H9c7tolZHH4pG1VaxFA9+TzFcVl9lIIgxrRUe7koMP0=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=lPcXR7QcJYuDq3DZIRKklOtehSIK7ICK+celz0HwQrTmE1L/HSRbiSQ3DcTwPTVAC iIw7Ft1z1JaXyuAWSTUAO9ZzH6CptBPvAAF9XaaEtP555SAtbgyUtWiS/t5rgP7e2v h0a5uOO+HVSZ/jFVqh99P5aTvbTI3ca5EAOESjLM= Received: from DLEE108.ent.ti.com (dlee108.ent.ti.com [157.170.170.38]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 20LETOvL048276 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 21 Jan 2022 08:29:24 -0600 Received: from DLEE104.ent.ti.com (157.170.170.34) by DLEE108.ent.ti.com (157.170.170.38) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14; Fri, 21 Jan 2022 08:29:24 -0600 Received: from lelv0327.itg.ti.com (10.180.67.183) by DLEE104.ent.ti.com (157.170.170.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14 via Frontend Transport; Fri, 21 Jan 2022 08:29:24 -0600 Received: from pratyush-4F-325.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 20LET4Hp072129; Fri, 21 Jan 2022 08:29:20 -0600 From: Pratyush Yadav To: Mauro Carvalho Chehab CC: Pratyush Yadav , Laurent Pinchart , Nikhil Devshatwar , Tomi Valkeinen , Benoit Parrot , Maxime Ripard , Rob Herring , Sakari Ailus , =?utf-8?q?Niklas_S=C3=B6derlun?= =?utf-8?q?d?= , , , Subject: [PATCH v6 04/14] media: cadence: csi2rx: Add external DPHY support Date: Fri, 21 Jan 2022 19:58:54 +0530 Message-ID: <20220121142904.4091481-5-p.yadav@ti.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220121142904.4091481-1-p.yadav@ti.com> References: <20220121142904.4091481-1-p.yadav@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Some platforms like TI's J721E can have the CSI2RX paired with an external DPHY. Add support to enable and configure the DPHY using the generic PHY framework. Signed-off-by: Pratyush Yadav Reviewed-by: Laurent Pinchart --- Changes in v6: - Drop variable bpp and use fmt->bpp directly. - Drop variable got_pm. Call phy_pm_runtime_put() unconditionally since it will just return an error if runtime PM is not enabled. - Add Laurent's R-by. Changes in v5: - Only error out when phy_pm_runtime_get_sync() returns a negative value. A positive value can be returned if the phy was already resumed. - Do not query the source subdev for format. Use the newly added internal format instead. Changes in v4: - Drop the call to set PHY submode. It is now being done via compatible on the DPHY side. Changes in v3: - Use v4l2_get_link_freq() to calculate pixel clock. Changes in v2: - Use phy_pm_runtime_get_sync() and phy_pm_runtime_put() before making calls to set PHY mode, etc. to make sure it is ready. drivers/media/platform/cadence/cdns-csi2rx.c | 91 +++++++++++++++++--- 1 file changed, 81 insertions(+), 10 deletions(-) diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c index ae3ebdb3890d..489f0d6e80d5 100644 --- a/drivers/media/platform/cadence/cdns-csi2rx.c +++ b/drivers/media/platform/cadence/cdns-csi2rx.c @@ -30,6 +30,12 @@ #define CSI2RX_STATIC_CFG_DLANE_MAP(llane, plane) ((plane) << (16 + (llane) * 4)) #define CSI2RX_STATIC_CFG_LANES_MASK GENMASK(11, 8) +#define CSI2RX_DPHY_LANE_CTRL_REG 0x40 +#define CSI2RX_DPHY_CL_RST BIT(16) +#define CSI2RX_DPHY_DL_RST(i) BIT((i) + 12) +#define CSI2RX_DPHY_CL_EN BIT(4) +#define CSI2RX_DPHY_DL_EN(i) BIT(i) + #define CSI2RX_STREAM_BASE(n) (((n) + 1) * 0x100) #define CSI2RX_STREAM_CTRL_REG(n) (CSI2RX_STREAM_BASE(n) + 0x000) @@ -137,6 +143,50 @@ static void csi2rx_reset(struct csi2rx_priv *csi2rx) writel(0, csi2rx->base + CSI2RX_SOFT_RESET_REG); } +static int csi2rx_configure_external_dphy(struct csi2rx_priv *csi2rx) +{ + union phy_configure_opts opts = { }; + struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy; + const struct csi2rx_fmt *fmt; + s64 pixel_clock; + int ret; + + fmt = csi2rx_get_fmt_by_code(csi2rx->fmt.code); + + /* + * Do not divide by the number of lanes here. That will be done by + * phy_mipi_dphy_get_default_config(). + */ + pixel_clock = v4l2_get_link_freq(csi2rx->source_subdev->ctrl_handler, + 1, 2); + if (pixel_clock < 0) + return pixel_clock; + + ret = phy_mipi_dphy_get_default_config(pixel_clock, fmt->bpp, + csi2rx->num_lanes, cfg); + if (ret) + return ret; + + ret = phy_pm_runtime_get_sync(csi2rx->dphy); + if (ret < 0 && ret != -ENOTSUPP) + return ret; + + ret = phy_power_on(csi2rx->dphy); + if (ret) + goto out; + + ret = phy_configure(csi2rx->dphy, &opts); + if (ret) { + /* Can't do anything if it fails. Ignore the return value. */ + phy_power_off(csi2rx->dphy); + goto out; + } + +out: + phy_pm_runtime_put(csi2rx->dphy); + return ret; +} + static int csi2rx_start(struct csi2rx_priv *csi2rx) { unsigned int i; @@ -175,6 +225,17 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx) if (ret) goto err_disable_pclk; + /* Enable DPHY clk and data lanes. */ + if (csi2rx->dphy) { + reg = CSI2RX_DPHY_CL_EN | CSI2RX_DPHY_CL_RST; + for (i = 0; i < csi2rx->num_lanes; i++) { + reg |= CSI2RX_DPHY_DL_EN(csi2rx->lanes[i] - 1); + reg |= CSI2RX_DPHY_DL_RST(csi2rx->lanes[i] - 1); + } + + writel(reg, csi2rx->base + CSI2RX_DPHY_LANE_CTRL_REG); + } + /* * Create a static mapping between the CSI virtual channels * and the output stream. @@ -205,10 +266,21 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx) if (ret) goto err_disable_pixclk; + if (csi2rx->dphy) { + ret = csi2rx_configure_external_dphy(csi2rx); + if (ret) { + dev_err(csi2rx->dev, + "Failed to configure external DPHY: %d\n", ret); + goto err_disable_sysclk; + } + } + clk_disable_unprepare(csi2rx->p_clk); return 0; +err_disable_sysclk: + clk_disable_unprepare(csi2rx->sys_clk); err_disable_pixclk: for (; i > 0; i--) clk_disable_unprepare(csi2rx->pixel_clk[i - 1]); @@ -236,6 +308,13 @@ static void csi2rx_stop(struct csi2rx_priv *csi2rx) if (v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, false)) dev_warn(csi2rx->dev, "Couldn't disable our subdev\n"); + + if (csi2rx->dphy) { + writel(0, csi2rx->base + CSI2RX_DPHY_LANE_CTRL_REG); + + if (phy_power_off(csi2rx->dphy)) + dev_warn(csi2rx->dev, "Couldn't power off DPHY\n"); + } } static int csi2rx_s_stream(struct v4l2_subdev *subdev, int enable) @@ -432,15 +511,6 @@ static int csi2rx_get_resources(struct csi2rx_priv *csi2rx, return PTR_ERR(csi2rx->dphy); } - /* - * FIXME: Once we'll have external D-PHY support, the check - * will need to be removed. - */ - if (csi2rx->dphy) { - dev_err(&pdev->dev, "External D-PHY not supported yet\n"); - return -EINVAL; - } - ret = clk_prepare_enable(csi2rx->p_clk); if (ret) { dev_err(&pdev->dev, "Couldn't prepare and enable P clock\n"); @@ -470,7 +540,7 @@ static int csi2rx_get_resources(struct csi2rx_priv *csi2rx, * FIXME: Once we'll have internal D-PHY support, the check * will need to be removed. */ - if (csi2rx->has_internal_dphy) { + if (!csi2rx->dphy && csi2rx->has_internal_dphy) { dev_err(&pdev->dev, "Internal D-PHY not supported yet\n"); return -EINVAL; } @@ -595,6 +665,7 @@ static int csi2rx_probe(struct platform_device *pdev) dev_info(&pdev->dev, "Probed CSI2RX with %u/%u lanes, %u streams, %s D-PHY\n", csi2rx->num_lanes, csi2rx->max_lanes, csi2rx->max_streams, + csi2rx->dphy ? "external" : csi2rx->has_internal_dphy ? "internal" : "no"); return 0;