From patchwork Fri Aug 28 15:49:05 2020
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Patchwork-Submitter: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
X-Patchwork-Id: 248589
Delivered-To: patch@linaro.org
Received: by 2002:a17:906:6447:0:0:0:0 with SMTP id l7csp1104290ejn;
 Fri, 28 Aug 2020 08:49:39 -0700 (PDT)
X-Google-Smtp-Source: ABdhPJx6N0GWLlJoRDebTeLsaDsKkm67pFufVTatZoxIPNSUuG3PUW/hkls8uN7vubvzto2XTtoY
X-Received: by 2002:a17:906:768c:: with SMTP id
 o12mr2408303ejm.269.1598629779175; 
 Fri, 28 Aug 2020 08:49:39 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1598629779; cv=none;
 d=google.com; s=arc-20160816;
 b=I4uZqpn4Sf+ZJfVa/TL8uhWsLiljvQi6RWHQV62yHoga2K6Sxx5CRjla+L941mG55M
 ouv6A98BkIw/k4iDVAIJfz/36s8cMBBoajrw5DykC1bF3zBiNvoZX0X60zlVKoSaTXp8
 e7Rs42oNIeMhfeDDxVwGb6OrAmFtVCAyV7uXNPe3GKSudQpoGBWv+cOzjloZ+Ze9Gc1W
 5bX+cwhIrApGJNizbEVwBO0JWjej/fn8G1yvGqGFpz+0gxs/Fh4lmXgiWtw32oTcT1oC
 M9RA9PMpyz3UBLfIh/Lt27WElplRNQ3KWfOkxXLKRWj6ik5iXcTvunE9vm3No7UQ2XD0
 c24g==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com;
 s=arc-20160816; 
 h=list-id:precedence:sender:content-transfer-encoding:mime-version
 :references:in-reply-to:message-id:date:subject:cc:to:from
 :dkim-signature;
 bh=jiQc6zvXqgVhlCLDJncG5pRO4+at1Ds7tUMNn9lLvNs=;
 b=wbmM4mi+FFZ46fgQZAfExZP0aA9x9g8RnpcRgHSojfFhK/9ZTJhdqGKUz+lA3UkX3P
 u/vxAokh/lnMtq+sBqU3obGrM7v5ZVLKXM9PD3fzX1jWxpfrtH7F1niw16pVBpxJr+Qp
 91HngoDxPjlIbcpK0qhc8GGuUoKfRn4QOqzYHa7JOMHAagZAZ36WkB73TE5kCN3sGaDm
 hcj94dgHKk5FTQ2mAuSWvrphMLjPVk41JJt8fgM5fLBRLHKR/3KSTYqrYIcn6U7fTmLK
 ssA10QVii8F0sRU4vE4kg8Ks0Ymd3REIZkZF13P7hkDWPpU0tvDB4GcQrjDAKyvSjgXC
 WVqA==
ARC-Authentication-Results: i=1; mx.google.com;
 dkim=pass header.i=@linaro.org header.s=google header.b=fV3BdhMY;
 spf=pass (google.com: domain of linux-arm-msm-owner@vger.kernel.org
 designates 23.128.96.18 as permitted sender)
 smtp.mailfrom=linux-arm-msm-owner@vger.kernel.org; 
 dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org
Return-Path: <linux-arm-msm-owner@vger.kernel.org>
Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18])
 by mx.google.com with ESMTP id d2si929283ejm.717.2020.08.28.08.49.38; 
 Fri, 28 Aug 2020 08:49:39 -0700 (PDT)
Received-SPF: pass (google.com: domain of
 linux-arm-msm-owner@vger.kernel.org designates 23.128.96.18
 as permitted sender) client-ip=23.128.96.18; 
Authentication-Results: mx.google.com;
 dkim=pass header.i=@linaro.org header.s=google header.b=fV3BdhMY;
 spf=pass (google.com: domain of linux-arm-msm-owner@vger.kernel.org
 designates 23.128.96.18 as permitted sender)
 smtp.mailfrom=linux-arm-msm-owner@vger.kernel.org; 
 dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
 id S1728039AbgH1Ptc (ORCPT <rfc822;patch@linaro.org> + 15 others);
 Fri, 28 Aug 2020 11:49:32 -0400
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40118 "EHLO
 lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by
 vger.kernel.org with ESMTP id S1725894AbgH1PtU (ORCPT
 <rfc822;linux-arm-msm@vger.kernel.org>);
 Fri, 28 Aug 2020 11:49:20 -0400
Received: from mail-lj1-x243.google.com (mail-lj1-x243.google.com
 [IPv6:2a00:1450:4864:20::243])
 by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8A245C06121B
 for <linux-arm-msm@vger.kernel.org>;
 Fri, 28 Aug 2020 08:49:19 -0700 (PDT)
Received: by mail-lj1-x243.google.com with SMTP id e11so1829033ljn.6
 for <linux-arm-msm@vger.kernel.org>;
 Fri, 28 Aug 2020 08:49:19 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; 
 h=from:to:cc:subject:date:message-id:in-reply-to:references
 :mime-version:content-transfer-encoding;
 bh=jiQc6zvXqgVhlCLDJncG5pRO4+at1Ds7tUMNn9lLvNs=;
 b=fV3BdhMYs0lF88jK+AZ9TLj4c/j8HfXoPCvbx2qb1W+7CVNrvElzRv9j0lNfbBjhbK
 k1xwAi+8lvNByEeuT7x66WmvvLS9QaYq0pWlinQZqvq/q/Yb+xXbZRZNu6nTgB0mU/MK
 V4e6ElxPpUHfqu2NyGgENo5lPl6uEKfZHEzGQbR6xOUNudkU4CffBFJC777I4B9IeMEb
 1gl/VcSX8aVcj+7g7DOFaZa0DeAYLLR6fDhHgSDyWwhBPms+DpWMmBlW9OtHanUROkut
 hZCwqxMim9Dr+WcapTBDwZXfqmcKJYmHTukhmm4mqZPm9ZTcxkwBvX6RpQx8Eo8NQS4X
 5RTw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20161025;
 h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to
 :references:mime-version:content-transfer-encoding;
 bh=jiQc6zvXqgVhlCLDJncG5pRO4+at1Ds7tUMNn9lLvNs=;
 b=QQejv4RoykVn89ZAC1zM1WE04BaH+DmzULjz3YN4CaYV35G8hB5yI/OoKtMjjQUJ/O
 fWOTZgaCVvM3aKM9wVybeomxYpQH2TK/6Cz4SvgCSwoxd5qQMevdhTueioaDl+IL+8LC
 b6VKA9GW+JY0i/LITa0Rna+h0n/a1pNHXxYQUg9cIUFr4uplpUrPmdjmm0zfaxScso1G
 mhOBGiednSL4UEJ0upPLPDc8QGYdJxvQY1ycZNSfjrq2xDuJXAXhQOMWwS9LiqI4ybbY
 kv0JV/8aodu2y2V/SBaG8oo23vzhX9J+gGqy5lyAih/Nf4E0wb2U2HizV5ieY2eaeX7+
 M+QQ==
X-Gm-Message-State: AOAM533CyORahItA9YgiN3DD15vByOweIM5bvc3I2uN6+kGC+enM0A4q
 RT+z1BIQFaD6bPMp/+ZInLlKig==
X-Received: by 2002:a2e:99cc:: with SMTP id l12mr1091744ljj.235.1598629757737; 
 Fri, 28 Aug 2020 08:49:17 -0700 (PDT)
Received: from eriador.lan ([188.162.64.62]) by smtp.gmail.com with ESMTPSA id
 r16sm270215ljd.71.2020.08.28.08.49.15
 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);
 Fri, 28 Aug 2020 08:49:17 -0700 (PDT)
From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org
Cc: linux-arm-msm@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
 Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
 Andrzej Hajda <a.hajda@samsung.com>,
 Neil Armstrong <narmstrong@baylibre.com>,
 Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
 Jonas Karlman <jonas@kwiboo.se>, Jernej Skrabec <jernej.skrabec@siol.net>,
 Vinod Koul <vkoul@kernel.org>, Sam Ravnborg <sam@ravnborg.org>
Subject: [PATCH v2 2/3] drm: bridge: add support for lontium LT9611UXC bridge
Date: Fri, 28 Aug 2020 18:49:05 +0300
Message-Id: <20200828154906.1662611-3-dmitry.baryshkov@linaro.org>
X-Mailer: git-send-email 2.28.0
In-Reply-To: <20200828154906.1662611-1-dmitry.baryshkov@linaro.org>
References: <20200828154906.1662611-1-dmitry.baryshkov@linaro.org>
MIME-Version: 1.0
Sender: linux-arm-msm-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-arm-msm.vger.kernel.org>
X-Mailing-List: linux-arm-msm@vger.kernel.org

Add support for Lontium LT9611UXC HDMI bridge. Lontium LT9611UXC is a
DSI to HDMI bridge which supports two DSI ports and I2S port as an input
and HDMI port as output. Despite name being similar to LT9611, these
devices are different enough to warrant separate driver.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/bridge/Kconfig             |  13 +
 drivers/gpu/drm/bridge/Makefile            |   1 +
 drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 774 +++++++++++++++++++++
 3 files changed, 788 insertions(+)
 create mode 100644 drivers/gpu/drm/bridge/lontium-lt9611uxc.c

-- 
2.28.0

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 3e11af4e9f63..8343fb054652 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -61,6 +61,19 @@ config DRM_LONTIUM_LT9611
 	  HDMI signals
 	  Please say Y if you have such hardware.
 
+config DRM_LONTIUM_LT9611UXC
+	tristate "Lontium LT9611UXC DSI/HDMI bridge"
+	select SND_SOC_HDMI_CODEC if SND_SOC
+	depends on OF
+	select DRM_PANEL_BRIDGE
+	select DRM_KMS_HELPER
+	select REGMAP_I2C
+	help
+	  Driver for Lontium LT9611UXC DSI to HDMI bridge
+	  chip driver that converts dual DSI and I2S to
+	  HDMI signals
+	  Please say Y if you have such hardware.
+
 config DRM_LVDS_CODEC
 	tristate "Transparent LVDS encoders and decoders support"
 	depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index c589a6a7cbe1..306850a5899b 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
 obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o
 obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o
 obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o
+obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o
 obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
 obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
 obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
new file mode 100644
index 000000000000..77c5aa5c6ad7
--- /dev/null
+++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
@@ -0,0 +1,774 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2019-2020. Linaro Limited.
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include <sound/hdmi-codec.h>
+
+#include <video/display_timing.h>
+#include <video/of_display_timing.h>
+#include <video/videomode.h>
+
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_print.h>
+
+#define EDID_BLOCK_SIZE	128
+#define EDID_NUM_BLOCKS	2
+
+struct lt9611uxc {
+	struct device *dev;
+	struct drm_bridge bridge;
+
+	struct regmap *regmap;
+	/* Protects all accesses to registers by stopping the on-chip MCU */
+	struct mutex ocm_lock;
+
+	struct device_node *dsi0_node;
+	struct device_node *dsi1_node;
+	struct mipi_dsi_device *dsi0;
+	struct mipi_dsi_device *dsi1;
+	struct platform_device *audio_pdev;
+
+	struct gpio_desc *reset_gpio;
+	struct gpio_desc *enable_gpio;
+
+	bool sleep;
+
+	struct regulator_bulk_data supplies[2];
+
+	struct i2c_client *client;
+
+	bool hpd_supported;
+	struct display_timings *timings;
+	u8 edid_buf[EDID_BLOCK_SIZE * EDID_NUM_BLOCKS];
+};
+
+#define LT9611_PAGE_CONTROL	0xff
+
+static const struct regmap_range_cfg lt9611uxc_ranges[] = {
+	{
+		.name = "register_range",
+		.range_min =  0,
+		.range_max = 0xd0ff,
+		.selector_reg = LT9611_PAGE_CONTROL,
+		.selector_mask = 0xff,
+		.selector_shift = 0,
+		.window_start = 0,
+		.window_len = 0x100,
+	},
+};
+
+static const struct regmap_config lt9611uxc_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0xffff,
+	.ranges = lt9611uxc_ranges,
+	.num_ranges = ARRAY_SIZE(lt9611uxc_ranges),
+};
+
+struct lt9611uxc_mode {
+	u16 hdisplay;
+	u16 vdisplay;
+	u8 vrefresh;
+	u8 lanes;
+	u8 intfs;
+};
+
+static struct lt9611uxc_mode lt9611uxc_modes[] = {
+	{ 3840, 2160, 60, 4, 2 }, /* 3840x2160 24bit 60Hz 4Lane 2ports */
+	{ 3840, 2160, 30, 4, 2 }, /* 3840x2160 24bit 30Hz 4Lane 2ports */
+	{ 1920, 1080, 60, 4, 1 }, /* 1080P 24bit 60Hz 4lane 1port */
+	{ 1920, 1080, 30, 3, 1 }, /* 1080P 24bit 30Hz 3lane 1port */
+	{ 1920, 1080, 24, 3, 1 },
+	{ 1024, 768, 60, 4, 1},
+	{ 800, 600, 60, 4, 1},
+	{ 720, 480, 60, 4, 1 },
+	{ 720, 576, 50, 2, 1 },
+	{ 640, 480, 60, 2, 1 },
+};
+
+static struct lt9611uxc *bridge_to_lt9611uxc(struct drm_bridge *bridge)
+{
+	return container_of(bridge, struct lt9611uxc, bridge);
+}
+
+static void lt9611uxc_lock(struct lt9611uxc *lt9611uxc)
+{
+	mutex_lock(&lt9611uxc->ocm_lock);
+	regmap_write(lt9611uxc->regmap, 0x80ee, 0x01);
+}
+
+static void lt9611uxc_unlock(struct lt9611uxc *lt9611uxc)
+{
+	regmap_write(lt9611uxc->regmap, 0x80ee, 0x00);
+	msleep(50);
+	mutex_unlock(&lt9611uxc->ocm_lock);
+}
+
+static irqreturn_t lt9611uxc_irq_thread_handler(int irq, void *dev_id)
+{
+	struct lt9611uxc *lt9611uxc = dev_id;
+	unsigned int irq_status = 0;
+	unsigned int hpd_status = 0;
+
+	lt9611uxc_lock(lt9611uxc);
+
+	regmap_read(lt9611uxc->regmap, 0xb022, &irq_status);
+	if (irq_status) {
+		regmap_write(lt9611uxc->regmap, 0xb022, 0);
+		regmap_read(lt9611uxc->regmap, 0xb023, &hpd_status);
+	}
+
+	lt9611uxc_unlock(lt9611uxc);
+
+	if (irq_status & 0x3 && lt9611uxc->bridge.dev)
+		drm_kms_helper_hotplug_event(lt9611uxc->bridge.dev);
+
+	return IRQ_HANDLED;
+}
+
+static void lt9611uxc_reset(struct lt9611uxc *lt9611uxc)
+{
+	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
+	msleep(20);
+
+	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 0);
+	msleep(20);
+
+	gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
+	msleep(180);
+
+	lt9611uxc->sleep = false;
+}
+
+static void lt9611uxc_assert_5v(struct lt9611uxc *lt9611uxc)
+{
+	if (!lt9611uxc->enable_gpio)
+		return;
+
+	gpiod_set_value_cansleep(lt9611uxc->enable_gpio, 1);
+	msleep(20);
+}
+
+static int lt9611uxc_regulator_init(struct lt9611uxc *lt9611uxc)
+{
+	int ret;
+
+	lt9611uxc->supplies[0].supply = "vdd";
+	lt9611uxc->supplies[1].supply = "vcc";
+
+	ret = devm_regulator_bulk_get(lt9611uxc->dev, 2, lt9611uxc->supplies);
+	if (ret < 0)
+		return ret;
+
+	return regulator_set_load(lt9611uxc->supplies[0].consumer, 200000);
+}
+
+static int lt9611uxc_regulator_enable(struct lt9611uxc *lt9611uxc)
+{
+	int ret;
+
+	ret = regulator_enable(lt9611uxc->supplies[0].consumer);
+	if (ret < 0)
+		return ret;
+
+	usleep_range(1000, 10000); /* 50000 according to dtsi */
+
+	ret = regulator_enable(lt9611uxc->supplies[1].consumer);
+	if (ret < 0) {
+		regulator_disable(lt9611uxc->supplies[0].consumer);
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct lt9611uxc_mode *lt9611uxc_find_mode(const struct drm_display_mode *mode)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(lt9611uxc_modes); i++) {
+		if (lt9611uxc_modes[i].hdisplay == mode->hdisplay &&
+		    lt9611uxc_modes[i].vdisplay == mode->vdisplay &&
+		    lt9611uxc_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
+			return &lt9611uxc_modes[i];
+		}
+	}
+
+	return NULL;
+}
+
+static struct mipi_dsi_device *lt9611uxc_attach_dsi(struct lt9611uxc *lt9611uxc,
+						    struct device_node *dsi_node)
+{
+	const struct mipi_dsi_device_info info = { "lt9611uxc", 0, NULL };
+	struct mipi_dsi_device *dsi;
+	struct mipi_dsi_host *host;
+	int ret;
+
+	host = of_find_mipi_dsi_host_by_node(dsi_node);
+	if (!host) {
+		dev_err(lt9611uxc->dev, "failed to find dsi host\n");
+		return ERR_PTR(-EPROBE_DEFER);
+	}
+
+	dsi = mipi_dsi_device_register_full(host, &info);
+	if (IS_ERR(dsi)) {
+		dev_err(lt9611uxc->dev, "failed to create dsi device\n");
+		return dsi;
+	}
+
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+			  MIPI_DSI_MODE_VIDEO_HSE;
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		dev_err(lt9611uxc->dev, "failed to attach dsi to host\n");
+		mipi_dsi_device_unregister(dsi);
+		return ERR_PTR(ret);
+	}
+
+	return dsi;
+}
+
+static void lt9611uxc_bridge_detach(struct drm_bridge *bridge)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+
+	if (lt9611uxc->dsi1) {
+		mipi_dsi_detach(lt9611uxc->dsi1);
+		mipi_dsi_device_unregister(lt9611uxc->dsi1);
+	}
+
+	mipi_dsi_detach(lt9611uxc->dsi0);
+	mipi_dsi_device_unregister(lt9611uxc->dsi0);
+}
+
+static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
+				   enum drm_bridge_attach_flags flags)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+	int ret;
+
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
+		dev_err(lt9611uxc->dev, "This bridge driver does not support providing connector!");
+		return -EINVAL;
+	}
+
+	/* Attach primary DSI */
+	lt9611uxc->dsi0 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi0_node);
+	if (IS_ERR(lt9611uxc->dsi0))
+		return PTR_ERR(lt9611uxc->dsi0);
+
+	/* Attach secondary DSI, if specified */
+	if (lt9611uxc->dsi1_node) {
+		lt9611uxc->dsi1 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi1_node);
+		if (IS_ERR(lt9611uxc->dsi1)) {
+			ret = PTR_ERR(lt9611uxc->dsi1);
+			goto err_unregister_dsi0;
+		}
+	}
+
+	return 0;
+
+err_unregister_dsi0:
+	mipi_dsi_detach(lt9611uxc->dsi0);
+	mipi_dsi_device_unregister(lt9611uxc->dsi0);
+
+	return ret;
+}
+
+static enum drm_mode_status
+lt9611uxc_bridge_mode_valid(struct drm_bridge *bridge,
+			    const struct drm_display_info *info,
+			    const struct drm_display_mode *mode)
+{
+	struct lt9611uxc_mode *lt9611uxc_mode;
+
+	lt9611uxc_mode = lt9611uxc_find_mode(mode);
+
+	return lt9611uxc_mode ? MODE_OK : MODE_BAD;
+}
+
+static void lt9611uxc_bridge_post_disable(struct drm_bridge *bridge)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+
+	lt9611uxc_lock(lt9611uxc);
+	regmap_update_bits(lt9611uxc->regmap, 0xb024, 0x1, 0x1);
+	lt9611uxc->sleep = true;
+	lt9611uxc_unlock(lt9611uxc);
+}
+
+static void lt9611uxc_video_setup(struct lt9611uxc *lt9611uxc,
+				  const struct drm_display_mode *mode)
+{
+	u32 h_total, hactive, hsync_len, hfront_porch;
+	u32 v_total, vactive, vsync_len, vfront_porch;
+
+	h_total = mode->htotal;
+	v_total = mode->vtotal;
+
+	hactive = mode->hdisplay;
+	hsync_len = mode->hsync_end - mode->hsync_start;
+	hfront_porch = mode->hsync_start - mode->hdisplay;
+
+	vactive = mode->vdisplay;
+	vsync_len = mode->vsync_end - mode->vsync_start;
+	vfront_porch = mode->vsync_start - mode->vdisplay;
+
+	regmap_write(lt9611uxc->regmap, 0xd00d, (u8)(v_total / 256));
+	regmap_write(lt9611uxc->regmap, 0xd00e, (u8)(v_total % 256));
+
+	regmap_write(lt9611uxc->regmap, 0xd00f, (u8)(vactive / 256));
+	regmap_write(lt9611uxc->regmap, 0xd010, (u8)(vactive % 256));
+
+	regmap_write(lt9611uxc->regmap, 0xd011, (u8)(h_total / 256));
+	regmap_write(lt9611uxc->regmap, 0xd012, (u8)(h_total % 256));
+
+	regmap_write(lt9611uxc->regmap, 0xd013, (u8)(hactive / 256));
+	regmap_write(lt9611uxc->regmap, 0xd014, (u8)(hactive % 256));
+
+	regmap_write(lt9611uxc->regmap, 0xd015, (u8)(vsync_len % 256));
+
+	regmap_update_bits(lt9611uxc->regmap, 0xd016, 0xf, (u8)(hsync_len / 256));
+	regmap_write(lt9611uxc->regmap, 0xd017, (u8)(hsync_len % 256));
+
+	regmap_update_bits(lt9611uxc->regmap, 0xd018, 0xf, (u8)(vfront_porch / 256));
+	regmap_write(lt9611uxc->regmap, 0xd019, (u8)(vfront_porch % 256));
+
+	regmap_update_bits(lt9611uxc->regmap, 0xd01a, 0xf, (u8)(hfront_porch / 256));
+	regmap_write(lt9611uxc->regmap, 0xd01b, (u8)(hfront_porch % 256));
+}
+
+static void lt9611uxc_bridge_mode_set(struct drm_bridge *bridge,
+				      const struct drm_display_mode *mode,
+				      const struct drm_display_mode *adj_mode)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+
+	if (lt9611uxc->sleep)
+		lt9611uxc_reset(lt9611uxc);
+
+	lt9611uxc_lock(lt9611uxc);
+	lt9611uxc_video_setup(lt9611uxc, mode);
+	lt9611uxc_unlock(lt9611uxc);
+}
+
+static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *bridge)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+	unsigned int reg_val = 0;
+	int ret;
+	int connected = 1;
+
+	if (lt9611uxc->hpd_supported) {
+		lt9611uxc_lock(lt9611uxc);
+		ret = regmap_read(lt9611uxc->regmap, 0xb023, &reg_val);
+		lt9611uxc_unlock(lt9611uxc);
+
+		if (ret)
+			dev_err(lt9611uxc->dev, "failed to read hpd status: %d\n", ret);
+		else
+			connected  = reg_val & BIT(1);
+	}
+
+	return connected ?  connector_status_connected :
+				connector_status_disconnected;
+}
+
+static int lt9611uxc_bridge_get_modes(struct drm_bridge *bridge,
+				      struct drm_connector *connector)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+	struct display_timings *timings = lt9611uxc->timings;
+	int i;
+
+	for (i = 0; i < timings->num_timings; i++) {
+		struct drm_display_mode *mode = drm_mode_create(bridge->dev);
+		struct videomode vm;
+
+		if (videomode_from_timings(timings, &vm, i))
+			break;
+
+		drm_display_mode_from_videomode(&vm, mode);
+
+		mode->type = DRM_MODE_TYPE_DRIVER;
+
+		if (timings->native_mode == i)
+			mode->type |= DRM_MODE_TYPE_PREFERRED;
+
+		drm_mode_set_name(mode);
+		drm_mode_probed_add(connector, mode);
+	}
+
+	return i;
+}
+
+static int lt9611uxc_read_edid(struct lt9611uxc *lt9611uxc)
+{
+	int ret = 0;
+	int i;
+
+	/* memset to clear old buffer, if any */
+	memset(lt9611uxc->edid_buf, 0, sizeof(lt9611uxc->edid_buf));
+
+	lt9611uxc_lock(lt9611uxc);
+
+	regmap_write(lt9611uxc->regmap, 0xb00b, 0x10);
+
+#define EDID_SEG 16
+	for (i = 0; i < 2 * EDID_BLOCK_SIZE; i += EDID_SEG) {
+		regmap_write(lt9611uxc->regmap, 0xb00a, i);
+		ret = regmap_noinc_read(lt9611uxc->regmap, 0xb0b0,
+					&lt9611uxc->edid_buf[i], EDID_SEG);
+		if (ret < 0)
+			break;
+	}
+
+	lt9611uxc_unlock(lt9611uxc);
+	return ret;
+}
+
+static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
+{
+	struct lt9611uxc *lt9611uxc = data;
+	int ret;
+
+	if (len > EDID_BLOCK_SIZE)
+		return -EINVAL;
+
+	if (block >= EDID_NUM_BLOCKS)
+		return -EINVAL;
+
+	if (block == 0) {
+		ret = lt9611uxc_read_edid(lt9611uxc);
+		if (ret) {
+			dev_err(lt9611uxc->dev, "edid read failed\n");
+			return ret;
+		}
+	}
+
+	memcpy(buf, lt9611uxc->edid_buf + block * EDID_BLOCK_SIZE, len);
+	return 0;
+};
+
+static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge,
+					      struct drm_connector *connector)
+{
+	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
+
+	return drm_do_get_edid(connector, lt9611uxc_get_edid_block, lt9611uxc);
+}
+
+static const struct drm_bridge_funcs lt9611uxc_bridge_funcs = {
+	.attach = lt9611uxc_bridge_attach,
+	.detach = lt9611uxc_bridge_detach,
+	.mode_valid = lt9611uxc_bridge_mode_valid,
+	.post_disable = lt9611uxc_bridge_post_disable,
+	.mode_set = lt9611uxc_bridge_mode_set,
+	.detect = lt9611uxc_bridge_detect,
+	.get_modes = lt9611uxc_bridge_get_modes,
+	.get_edid = lt9611uxc_bridge_get_edid,
+};
+
+static int lt9611uxc_parse_dt(struct device *dev,
+			      struct lt9611uxc *lt9611uxc)
+{
+	lt9611uxc->timings = of_get_display_timings(dev->of_node);
+	if (!lt9611uxc->timings)
+		dev_info(dev, "no display timings provided\n");
+
+	lt9611uxc->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
+	if (!lt9611uxc->dsi0_node) {
+		dev_err(lt9611uxc->dev, "failed to get remote node for primary dsi\n");
+		return -ENODEV;
+	}
+
+	lt9611uxc->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
+
+	return 0;
+}
+
+static int lt9611uxc_gpio_init(struct lt9611uxc *lt9611uxc)
+{
+	struct device *dev = lt9611uxc->dev;
+
+	lt9611uxc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(lt9611uxc->reset_gpio)) {
+		dev_err(dev, "failed to acquire reset gpio\n");
+		return PTR_ERR(lt9611uxc->reset_gpio);
+	}
+
+	lt9611uxc->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(lt9611uxc->enable_gpio)) {
+		dev_err(dev, "failed to acquire enable gpio\n");
+		return PTR_ERR(lt9611uxc->enable_gpio);
+	}
+
+	return 0;
+}
+
+static int lt9611uxc_read_device_rev(struct lt9611uxc *lt9611uxc)
+{
+	unsigned int rev0, rev1, rev2;
+	int ret;
+
+	lt9611uxc_lock(lt9611uxc);
+
+	ret = regmap_read(lt9611uxc->regmap, 0x8100, &rev0);
+	ret |= regmap_read(lt9611uxc->regmap, 0x8101, &rev1);
+	ret |= regmap_read(lt9611uxc->regmap, 0x8102, &rev2);
+	if (ret)
+		dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
+	else
+		dev_info(lt9611uxc->dev, "LT9611 revision: 0x%02x.%02x.%02x\n", rev0, rev1, rev2);
+
+	lt9611uxc_unlock(lt9611uxc);
+
+	return ret;
+}
+
+static int lt9611uxc_read_version(struct lt9611uxc *lt9611uxc)
+{
+	unsigned int rev;
+	int ret;
+
+	lt9611uxc_lock(lt9611uxc);
+
+	ret = regmap_read(lt9611uxc->regmap, 0xb021, &rev);
+	if (ret)
+		dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
+	else
+		dev_info(lt9611uxc->dev, "LT9611 version: 0x%02x\n", rev);
+
+	lt9611uxc_unlock(lt9611uxc);
+
+	return ret < 0 ? ret : rev;
+}
+
+static int lt9611uxc_hdmi_hw_params(struct device *dev, void *data,
+				    struct hdmi_codec_daifmt *fmt,
+				    struct hdmi_codec_params *hparms)
+{
+	/*
+	 * LT9611UXC will automatically detect rate and sample size, so no need
+	 * to setup anything here.
+	 */
+	return 0;
+}
+
+static void lt9611uxc_audio_shutdown(struct device *dev, void *data)
+{
+}
+
+static int lt9611uxc_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
+					 struct device_node *endpoint)
+{
+	struct of_endpoint of_ep;
+	int ret;
+
+	ret = of_graph_parse_endpoint(endpoint, &of_ep);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * HDMI sound should be located as reg = <2>
+	 * Then, it is sound port 0
+	 */
+	if (of_ep.port == 2)
+		return 0;
+
+	return -EINVAL;
+}
+
+static const struct hdmi_codec_ops lt9611uxc_codec_ops = {
+	.hw_params	= lt9611uxc_hdmi_hw_params,
+	.audio_shutdown = lt9611uxc_audio_shutdown,
+	.get_dai_id	= lt9611uxc_hdmi_i2s_get_dai_id,
+};
+
+static int lt9611uxc_audio_init(struct device *dev, struct lt9611uxc *lt9611uxc)
+{
+	struct hdmi_codec_pdata codec_data = {
+		.ops = &lt9611uxc_codec_ops,
+		.max_i2s_channels = 2,
+		.i2s = 1,
+		.data = lt9611uxc,
+	};
+
+	lt9611uxc->audio_pdev =
+		platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
+					      PLATFORM_DEVID_AUTO,
+					      &codec_data, sizeof(codec_data));
+
+	return PTR_ERR_OR_ZERO(lt9611uxc->audio_pdev);
+}
+
+static void lt9611uxc_audio_exit(struct lt9611uxc *lt9611uxc)
+{
+	if (lt9611uxc->audio_pdev) {
+		platform_device_unregister(lt9611uxc->audio_pdev);
+		lt9611uxc->audio_pdev = NULL;
+	}
+}
+
+static int lt9611uxc_probe(struct i2c_client *client,
+			   const struct i2c_device_id *id)
+{
+	struct lt9611uxc *lt9611uxc;
+	struct device *dev = &client->dev;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(dev, "device doesn't support I2C\n");
+		return -ENODEV;
+	}
+
+	lt9611uxc = devm_kzalloc(dev, sizeof(*lt9611uxc), GFP_KERNEL);
+	if (!lt9611uxc)
+		return -ENOMEM;
+
+	lt9611uxc->dev = &client->dev;
+	lt9611uxc->client = client;
+	mutex_init(&lt9611uxc->ocm_lock);
+
+	lt9611uxc->regmap = devm_regmap_init_i2c(client, &lt9611uxc_regmap_config);
+	if (IS_ERR(lt9611uxc->regmap)) {
+		dev_err(lt9611uxc->dev, "regmap i2c init failed\n");
+		return PTR_ERR(lt9611uxc->regmap);
+	}
+
+	ret = lt9611uxc_parse_dt(&client->dev, lt9611uxc);
+	if (ret) {
+		dev_err(dev, "failed to parse device tree\n");
+		return ret;
+	}
+
+	ret = lt9611uxc_gpio_init(lt9611uxc);
+	if (ret < 0)
+		goto err_of_put;
+
+	ret = lt9611uxc_regulator_init(lt9611uxc);
+	if (ret < 0)
+		goto err_of_put;
+
+	lt9611uxc_assert_5v(lt9611uxc);
+
+	ret = lt9611uxc_regulator_enable(lt9611uxc);
+	if (ret)
+		goto err_of_put;
+
+	lt9611uxc_reset(lt9611uxc);
+
+	ret = lt9611uxc_read_device_rev(lt9611uxc);
+	if (ret) {
+		dev_err(dev, "failed to read chip rev\n");
+		goto err_disable_regulators;
+	}
+
+	ret = lt9611uxc_read_version(lt9611uxc);
+	if (ret < 0) {
+		dev_err(dev, "failed to read FW version\n");
+		goto err_disable_regulators;
+	} else if (ret == 0) {
+		dev_err(dev, "FW version 0, FW update not supported\n");
+		ret = -EOPNOTSUPP;
+		goto err_disable_regulators;
+	} else if (ret < 0x40) {
+		dev_info(dev, "FW version 0x%x, HPD not supported\n", ret);
+	} else {
+		lt9611uxc->hpd_supported = true;
+	}
+
+	ret = devm_request_threaded_irq(dev, client->irq, NULL,
+					lt9611uxc_irq_thread_handler,
+					IRQF_ONESHOT, "lt9611uxc", lt9611uxc);
+	if (ret) {
+		dev_err(dev, "failed to request irq\n");
+		goto err_disable_regulators;
+	}
+
+	i2c_set_clientdata(client, lt9611uxc);
+
+	lt9611uxc->bridge.funcs = &lt9611uxc_bridge_funcs;
+	lt9611uxc->bridge.of_node = client->dev.of_node;
+	lt9611uxc->bridge.ops = DRM_BRIDGE_OP_DETECT;
+	if (lt9611uxc->timings)
+		lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_MODES;
+	else
+		lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_EDID;
+	if (lt9611uxc->hpd_supported)
+		lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_HPD;
+	lt9611uxc->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
+
+	drm_bridge_add(&lt9611uxc->bridge);
+
+	return lt9611uxc_audio_init(dev, lt9611uxc);
+
+err_disable_regulators:
+	regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
+
+err_of_put:
+	of_node_put(lt9611uxc->dsi1_node);
+	of_node_put(lt9611uxc->dsi0_node);
+
+	return ret;
+}
+
+static int lt9611uxc_remove(struct i2c_client *client)
+{
+	struct lt9611uxc *lt9611uxc = i2c_get_clientdata(client);
+
+	disable_irq(client->irq);
+	lt9611uxc_audio_exit(lt9611uxc);
+	drm_bridge_remove(&lt9611uxc->bridge);
+
+	mutex_destroy(&lt9611uxc->ocm_lock);
+
+	regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
+
+	of_node_put(lt9611uxc->dsi1_node);
+	of_node_put(lt9611uxc->dsi0_node);
+
+	return 0;
+}
+
+static struct i2c_device_id lt9611uxc_id[] = {
+	{ "lontium,lt9611uxc", 0 },
+	{}
+};
+
+static const struct of_device_id lt9611uxc_match_table[] = {
+	{ .compatible = "lontium,lt9611uxc" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, lt9611uxc_match_table);
+
+static struct i2c_driver lt9611uxc_driver = {
+	.driver = {
+		.name = "lt9611uxc",
+		.of_match_table = lt9611uxc_match_table,
+	},
+	.probe = lt9611uxc_probe,
+	.remove = lt9611uxc_remove,
+	.id_table = lt9611uxc_id,
+};
+module_i2c_driver(lt9611uxc_driver);
+
+MODULE_LICENSE("GPL v2");