From 22e04a3fa8b9dfc5cc6d42d87a6c0d3fd7720d4a Mon Sep 17 00:00:00 2001
From: Wyon Bi <bivvy.bi@rock-chips.com>
Date: Tue, 24 May 2022 17:49:07 +0800
Subject: [PATCH] Revert "drm/bridge: Add support for Lontium LT8912"

This reverts commit 230f7f061036a99fc02d2cd7d20f66f7f0efae99.

Remove unused driver.

Change-Id: Id4ae232cbc6a76af85aaedbf80749de18f16b5bb
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
---
 .../display/bridge/lontium,lt8912.txt         |  20 -
 drivers/gpu/drm/bridge/lt8912.c               | 484 ------------------
 2 files changed, 504 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt8912.txt
 delete mode 100644 drivers/gpu/drm/bridge/lt8912.c

diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.txt b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.txt
deleted file mode 100644
index 8a6a22610564..000000000000
--- a/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-Lontium LT8912 MIPI-DSI to LVDS and HDMI/MHL bridge bindings
-
-Required properties:
- - compatible: "lontium,lt8912"
- - reg: virtual channel id
- - reset-gpios: a GPIO spec for the reset pin
- - i2c-bus: phandle of an I2C controller used for register access
-
-Example:
-
-&dsi {
-	status = "okay";
-
-	lt8912@0 {
-		compatible = "lontium,lt8912";
-		reg = <0>;
-		reset-gpios = <&gpio0 RK_PA2 GPIO_ACTIVE_LOW>;
-		i2c-bus = <&i2c1>;
-	};
-};
diff --git a/drivers/gpu/drm/bridge/lt8912.c b/drivers/gpu/drm/bridge/lt8912.c
deleted file mode 100644
index db33c8181f5e..000000000000
--- a/drivers/gpu/drm/bridge/lt8912.c
+++ /dev/null
@@ -1,484 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (c) 2018 Rockchip Electronics Co. Ltd.
- */
-
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/gpio.h>
-#include <linux/gpio/consumer.h>
-#include <linux/i2c.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_irq.h>
-#include <linux/of_graph.h>
-#include <linux/regmap.h>
-#include <video/of_display_timing.h>
-
-#include <drm/drmP.h>
-#include <drm/drm_of.h>
-#include <drm/drm_atomic.h>
-#include <drm/drm_crtc_helper.h>
-#include <drm/drm_atomic_helper.h>
-#include <drm/drm_panel.h>
-#include <drm/drm_mipi_dsi.h>
-
-struct lt8912 {
-	struct drm_bridge bridge;
-	struct drm_connector connector;
-	struct drm_display_mode mode;
-	struct device *dev;
-	struct mipi_dsi_device *dsi;
-	struct regmap *regmap[3];
-	struct gpio_desc *reset_n;
-};
-
-static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b)
-{
-	return container_of(b, struct lt8912, bridge);
-}
-
-static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c)
-{
-	return container_of(c, struct lt8912, connector);
-}
-
-/* LT8912 MIPI to HDMI & LVDS REG setting - 20180115.txt */
-static void lt8912_init(struct lt8912 *lt8912)
-{
-	u8 lanes = lt8912->dsi->lanes;
-	const struct drm_display_mode *mode = &lt8912->mode;
-	u32 hactive, hfp, hsync, hbp, vfp, vsync, vbp, htotal, vtotal;
-	unsigned int version[2];
-
-	/* TODO: lvds output init */
-
-	hactive = mode->hdisplay;
-	hfp = mode->hsync_start - mode->hdisplay;
-	hsync = mode->hsync_end - mode->hsync_start;
-	hbp = mode->htotal - mode->hsync_end;
-	vfp = mode->vsync_start - mode->vdisplay;
-	vsync = mode->vsync_end - mode->vsync_start;
-	vbp = mode->vtotal - mode->vsync_end;
-	htotal = mode->htotal;
-	vtotal = mode->vtotal;
-
-	regmap_read(lt8912->regmap[0], 0x00, &version[0]);
-	regmap_read(lt8912->regmap[0], 0x01, &version[1]);
-
-	dev_info(lt8912->dev, "LT8912 ID: %02x, %02x\n",
-		 version[0], version[1]);
-
-	/* DigitalClockEn */
-	regmap_write(lt8912->regmap[0], 0x08, 0xff);
-	regmap_write(lt8912->regmap[0], 0x09, 0x81);
-	regmap_write(lt8912->regmap[0], 0x0a, 0xff);
-	regmap_write(lt8912->regmap[0], 0x0b, 0x64);
-	regmap_write(lt8912->regmap[0], 0x0c, 0xff);
-
-	regmap_write(lt8912->regmap[0], 0x44, 0x31);
-	regmap_write(lt8912->regmap[0], 0x51, 0x1f);
-
-	/* TxAnalog */
-	regmap_write(lt8912->regmap[0], 0x31, 0xa1);
-	regmap_write(lt8912->regmap[0], 0x32, 0xa1);
-	regmap_write(lt8912->regmap[0], 0x33, 0x03);
-	regmap_write(lt8912->regmap[0], 0x37, 0x00);
-	regmap_write(lt8912->regmap[0], 0x38, 0x22);
-	regmap_write(lt8912->regmap[0], 0x60, 0x82);
-
-	/* CbusAnalog */
-	regmap_write(lt8912->regmap[0], 0x39, 0x45);
-	regmap_write(lt8912->regmap[0], 0x3b, 0x00);
-
-	/* HDMIPllAnalog */
-	regmap_write(lt8912->regmap[0], 0x44, 0x31);
-	regmap_write(lt8912->regmap[0], 0x55, 0x44);
-	regmap_write(lt8912->regmap[0], 0x57, 0x01);
-	regmap_write(lt8912->regmap[0], 0x5a, 0x02);
-
-	/* MipiBasicSet */
-	regmap_write(lt8912->regmap[1], 0x10, 0x01);
-	regmap_write(lt8912->regmap[1], 0x11, 0x08);
-	regmap_write(lt8912->regmap[1], 0x12, 0x04);
-	regmap_write(lt8912->regmap[1], 0x13, lanes % 4);
-	regmap_write(lt8912->regmap[1], 0x14, 0x00);
-
-	regmap_write(lt8912->regmap[1], 0x15, 0x00);
-	regmap_write(lt8912->regmap[1], 0x1a, 0x03);
-	regmap_write(lt8912->regmap[1], 0x1b, 0x03);
-
-	/* MIPIDig */
-	regmap_write(lt8912->regmap[1], 0x18, hsync);
-	regmap_write(lt8912->regmap[1], 0x19, vsync);
-	regmap_write(lt8912->regmap[1], 0x1c, hactive);
-	regmap_write(lt8912->regmap[1], 0x1d, hactive >> 8);
-
-	regmap_write(lt8912->regmap[1], 0x1e, 0x67);
-	regmap_write(lt8912->regmap[1], 0x2f, 0x0c);
-
-	regmap_write(lt8912->regmap[1], 0x34, htotal);
-	regmap_write(lt8912->regmap[1], 0x35, htotal >> 8);
-	regmap_write(lt8912->regmap[1], 0x36, vtotal);
-	regmap_write(lt8912->regmap[1], 0x37, vtotal >> 8);
-	regmap_write(lt8912->regmap[1], 0x38, vbp);
-	regmap_write(lt8912->regmap[1], 0x39, vbp >> 8);
-	regmap_write(lt8912->regmap[1], 0x3a, vfp);
-	regmap_write(lt8912->regmap[1], 0x3b, vfp >> 8);
-	regmap_write(lt8912->regmap[1], 0x3c, hbp);
-	regmap_write(lt8912->regmap[1], 0x3d, hbp >> 8);
-	regmap_write(lt8912->regmap[1], 0x3e, hfp);
-	regmap_write(lt8912->regmap[1], 0x3f, hfp >> 8);
-
-	/* DDSConfig */
-	regmap_write(lt8912->regmap[1], 0x4e, 0x52);
-	regmap_write(lt8912->regmap[1], 0x4f, 0xde);
-	regmap_write(lt8912->regmap[1], 0x50, 0xc0);
-	regmap_write(lt8912->regmap[1], 0x51, 0x80);
-	regmap_write(lt8912->regmap[1], 0x51, 0x00);
-
-	regmap_write(lt8912->regmap[1], 0x1f, 0x5e);
-	regmap_write(lt8912->regmap[1], 0x20, 0x01);
-	regmap_write(lt8912->regmap[1], 0x21, 0x2c);
-	regmap_write(lt8912->regmap[1], 0x22, 0x01);
-	regmap_write(lt8912->regmap[1], 0x23, 0xfa);
-	regmap_write(lt8912->regmap[1], 0x24, 0x00);
-	regmap_write(lt8912->regmap[1], 0x25, 0xc8);
-	regmap_write(lt8912->regmap[1], 0x26, 0x00);
-	regmap_write(lt8912->regmap[1], 0x27, 0x5e);
-	regmap_write(lt8912->regmap[1], 0x28, 0x01);
-	regmap_write(lt8912->regmap[1], 0x29, 0x2c);
-	regmap_write(lt8912->regmap[1], 0x2a, 0x01);
-	regmap_write(lt8912->regmap[1], 0x2b, 0xfa);
-	regmap_write(lt8912->regmap[1], 0x2c, 0x00);
-	regmap_write(lt8912->regmap[1], 0x2d, 0xc8);
-	regmap_write(lt8912->regmap[1], 0x2e, 0x00);
-
-	regmap_write(lt8912->regmap[0], 0x03, 0x7f);
-	usleep_range(10000, 20000);
-	regmap_write(lt8912->regmap[0], 0x03, 0xff);
-
-	regmap_write(lt8912->regmap[1], 0x42, 0x64);
-	regmap_write(lt8912->regmap[1], 0x43, 0x00);
-	regmap_write(lt8912->regmap[1], 0x44, 0x04);
-	regmap_write(lt8912->regmap[1], 0x45, 0x00);
-	regmap_write(lt8912->regmap[1], 0x46, 0x59);
-	regmap_write(lt8912->regmap[1], 0x47, 0x00);
-	regmap_write(lt8912->regmap[1], 0x48, 0xf2);
-	regmap_write(lt8912->regmap[1], 0x49, 0x06);
-	regmap_write(lt8912->regmap[1], 0x4a, 0x00);
-	regmap_write(lt8912->regmap[1], 0x4b, 0x72);
-	regmap_write(lt8912->regmap[1], 0x4c, 0x45);
-	regmap_write(lt8912->regmap[1], 0x4d, 0x00);
-	regmap_write(lt8912->regmap[1], 0x52, 0x08);
-	regmap_write(lt8912->regmap[1], 0x53, 0x00);
-	regmap_write(lt8912->regmap[1], 0x54, 0xb2);
-	regmap_write(lt8912->regmap[1], 0x55, 0x00);
-	regmap_write(lt8912->regmap[1], 0x56, 0xe4);
-	regmap_write(lt8912->regmap[1], 0x57, 0x0d);
-	regmap_write(lt8912->regmap[1], 0x58, 0x00);
-	regmap_write(lt8912->regmap[1], 0x59, 0xe4);
-	regmap_write(lt8912->regmap[1], 0x5a, 0x8a);
-	regmap_write(lt8912->regmap[1], 0x5b, 0x00);
-	regmap_write(lt8912->regmap[1], 0x5c, 0x34);
-	regmap_write(lt8912->regmap[1], 0x1e, 0x4f);
-	regmap_write(lt8912->regmap[1], 0x51, 0x00);
-
-	regmap_write(lt8912->regmap[0], 0xb2, 0x01);
-
-	/* AudioIIsEn */
-	regmap_write(lt8912->regmap[2], 0x06, 0x08);
-	regmap_write(lt8912->regmap[2], 0x07, 0xf0);
-
-	regmap_write(lt8912->regmap[2], 0x34, 0xd2);
-
-	regmap_write(lt8912->regmap[2], 0x3c, 0x41);
-
-	/* MIPIRxLogicRes */
-	regmap_write(lt8912->regmap[0], 0x03, 0x7f);
-	usleep_range(10000, 20000);
-	regmap_write(lt8912->regmap[0], 0x03, 0xff);
-
-	regmap_write(lt8912->regmap[1], 0x51, 0x80);
-	usleep_range(10000, 20000);
-	regmap_write(lt8912->regmap[1], 0x51, 0x00);
-}
-
-static void lt8912_exit(struct lt8912 *lt8912)
-{
-	regmap_write(lt8912->regmap[0], 0x08, 0x00);
-	regmap_write(lt8912->regmap[0], 0x09, 0x81);
-	regmap_write(lt8912->regmap[0], 0x0a, 0x00);
-	regmap_write(lt8912->regmap[0], 0x0b, 0x20);
-	regmap_write(lt8912->regmap[0], 0x0c, 0x00);
-
-	regmap_write(lt8912->regmap[0], 0x54, 0x1d);
-	regmap_write(lt8912->regmap[0], 0x51, 0x15);
-
-	regmap_write(lt8912->regmap[0], 0x44, 0x31);
-	regmap_write(lt8912->regmap[0], 0x41, 0xbd);
-	regmap_write(lt8912->regmap[0], 0x5c, 0x11);
-
-	regmap_write(lt8912->regmap[0], 0x30, 0x08);
-	regmap_write(lt8912->regmap[0], 0x31, 0x00);
-	regmap_write(lt8912->regmap[0], 0x32, 0x00);
-	regmap_write(lt8912->regmap[0], 0x33, 0x00);
-	regmap_write(lt8912->regmap[0], 0x34, 0x00);
-	regmap_write(lt8912->regmap[0], 0x35, 0x00);
-	regmap_write(lt8912->regmap[0], 0x36, 0x00);
-	regmap_write(lt8912->regmap[0], 0x37, 0x00);
-	regmap_write(lt8912->regmap[0], 0x38, 0x00);
-}
-
-static void lt8912_power_on(struct lt8912 *lt8912)
-{
-	gpiod_direction_output(lt8912->reset_n, 1);
-	msleep(120);
-	gpiod_direction_output(lt8912->reset_n, 0);
-}
-
-static void lt8912_power_off(struct lt8912 *lt8912)
-{
-	gpiod_direction_output(lt8912->reset_n, 1);
-}
-
-static enum drm_connector_status
-lt8912_connector_detect(struct drm_connector *connector, bool force)
-{
-	/* TODO: HPD handing (reg[0xc1] - bit[7]) */
-	return connector_status_connected;
-}
-
-static const struct drm_connector_funcs lt8912_connector_funcs = {
-	.dpms = drm_atomic_helper_connector_dpms,
-	.detect = lt8912_connector_detect,
-	.fill_modes = drm_helper_probe_single_connector_modes,
-	.destroy = drm_connector_cleanup,
-	.reset = drm_atomic_helper_connector_reset,
-	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
-};
-
-static struct drm_encoder *
-lt8912_connector_best_encoder(struct drm_connector *connector)
-{
-	struct lt8912 *lt8912 = connector_to_lt8912(connector);
-
-	return lt8912->bridge.encoder;
-}
-
-static int lt8912_connector_get_modes(struct drm_connector *connector)
-{
-	int num_modes = 0;
-
-	num_modes = drm_add_modes_noedid(connector, 1920, 1080);
-	drm_set_preferred_mode(connector, 1920, 1080);
-
-	return num_modes;
-}
-
-static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = {
-	.get_modes = lt8912_connector_get_modes,
-	.best_encoder = lt8912_connector_best_encoder,
-};
-
-static void lt8912_bridge_post_disable(struct drm_bridge *bridge)
-{
-	struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
-
-	lt8912_power_off(lt8912);
-}
-
-static void lt8912_bridge_disable(struct drm_bridge *bridge)
-{
-	struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
-
-	lt8912_exit(lt8912);
-}
-
-static void lt8912_bridge_enable(struct drm_bridge *bridge)
-{
-	struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
-
-	lt8912_init(lt8912);
-}
-
-static void lt8912_bridge_pre_enable(struct drm_bridge *bridge)
-{
-	struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
-
-	lt8912_power_on(lt8912);
-}
-
-static void lt8912_bridge_mode_set(struct drm_bridge *bridge,
-				   struct drm_display_mode *mode,
-				   struct drm_display_mode *adj)
-{
-	struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
-
-	drm_mode_copy(&lt8912->mode, adj);
-}
-
-static int lt8912_bridge_attach(struct drm_bridge *bridge)
-{
-	struct lt8912 *lt8912 = bridge_to_lt8912(bridge);
-	struct drm_connector *connector = &lt8912->connector;
-	int ret;
-
-	ret = drm_connector_init(bridge->dev, connector,
-				 &lt8912_connector_funcs,
-				 DRM_MODE_CONNECTOR_HDMIA);
-	if (ret) {
-		dev_err(lt8912->dev, "failed to initialize connector\n");
-		return ret;
-	}
-
-	drm_connector_helper_add(connector, &lt8912_connector_helper_funcs);
-	drm_mode_connector_attach_encoder(connector, bridge->encoder);
-
-	return 0;
-}
-
-static const struct drm_bridge_funcs lt8912_bridge_funcs = {
-	.attach = lt8912_bridge_attach,
-	.mode_set = lt8912_bridge_mode_set,
-	.pre_enable = lt8912_bridge_pre_enable,
-	.enable = lt8912_bridge_enable,
-	.disable = lt8912_bridge_disable,
-	.post_disable = lt8912_bridge_post_disable,
-};
-
-static const struct regmap_config lt8912_regmap_config = {
-	.reg_bits = 8,
-	.val_bits = 8,
-	.max_register = 0xff,
-};
-
-static int lt8912_i2c_init(struct lt8912 *lt8912,
-			   struct i2c_adapter *adapter)
-{
-	struct i2c_board_info info[] = {
-		{ I2C_BOARD_INFO("lt8912p0", 0x48), },
-		{ I2C_BOARD_INFO("lt8912p1", 0x49), },
-		{ I2C_BOARD_INFO("lt8912p2", 0x4a), }
-	};
-	struct regmap *regmap;
-	unsigned int i;
-	int ret;
-
-	for (i = 0; i < ARRAY_SIZE(info); i++) {
-		struct i2c_client *client;
-
-		client = i2c_new_device(adapter, &info[i]);
-		if (!client)
-			return -ENODEV;
-
-		regmap = devm_regmap_init_i2c(client, &lt8912_regmap_config);
-		if (IS_ERR(regmap)) {
-			ret = PTR_ERR(regmap);
-			dev_err(lt8912->dev,
-				"Failed to initialize regmap: %d\n", ret);
-			return ret;
-		}
-
-		lt8912->regmap[i] = regmap;
-	}
-
-	return 0;
-}
-
-static int lt8912_probe(struct mipi_dsi_device *dsi)
-{
-	struct device *dev = &dsi->dev;
-	struct lt8912 *lt8912;
-	struct device_node *node;
-	struct i2c_adapter *adapter;
-	int ret;
-
-	lt8912 = devm_kzalloc(dev, sizeof(*lt8912), GFP_KERNEL);
-	if (!lt8912)
-		return -ENOMEM;
-
-	lt8912->dev = dev;
-	lt8912->dsi = dsi;
-	mipi_dsi_set_drvdata(dsi, lt8912);
-
-	lt8912->reset_n = devm_gpiod_get(dev, "reset", GPIOD_ASIS);
-	if (IS_ERR(lt8912->reset_n)) {
-		ret = PTR_ERR(lt8912->reset_n);
-		dev_err(dev, "failed to request reset GPIO: %d\n", ret);
-		return ret;
-	}
-
-	node = of_parse_phandle(dev->of_node, "i2c-bus", 0);
-	if (!node) {
-		dev_err(dev, "No i2c-bus found\n");
-		return -ENODEV;
-	}
-
-	adapter = of_find_i2c_adapter_by_node(node);
-	of_node_put(node);
-	if (!adapter) {
-		dev_err(dev, "No i2c adapter found\n");
-		return -EPROBE_DEFER;
-	}
-
-	ret = lt8912_i2c_init(lt8912, adapter);
-	if (ret)
-		return ret;
-
-	/* TODO: interrupt handing */
-
-	lt8912->bridge.funcs = &lt8912_bridge_funcs;
-	lt8912->bridge.of_node = dev->of_node;
-	ret = drm_bridge_add(&lt8912->bridge);
-	if (ret) {
-		dev_err(dev, "failed to add bridge: %d\n", ret);
-		return ret;
-	}
-
-	dsi->lanes = 4;
-	dsi->format = MIPI_DSI_FMT_RGB888;
-	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
-			  MIPI_DSI_MODE_VIDEO_HBP | MIPI_DSI_MODE_LPM |
-			  MIPI_DSI_MODE_EOT_PACKET;
-
-	ret = mipi_dsi_attach(dsi);
-	if (ret) {
-		drm_bridge_remove(&lt8912->bridge);
-		dev_err(dev, "failed to attach dsi to host: %d\n", ret);
-		return ret;
-	}
-
-	return 0;
-}
-
-static int lt8912_remove(struct mipi_dsi_device *dsi)
-{
-	struct lt8912 *lt8912 = mipi_dsi_get_drvdata(dsi);
-
-	mipi_dsi_detach(dsi);
-	drm_bridge_remove(&lt8912->bridge);
-
-	return 0;
-}
-
-static const struct of_device_id lt8912_of_match[] = {
-	{ .compatible = "lontium,lt8912" },
-	{}
-};
-MODULE_DEVICE_TABLE(of, lt8912_of_match);
-
-static struct mipi_dsi_driver lt8912_driver = {
-	.driver = {
-		.name = "lt8912",
-		.of_match_table = lt8912_of_match,
-	},
-	.probe = lt8912_probe,
-	.remove = lt8912_remove,
-};
-module_mipi_dsi_driver(lt8912_driver);
-
-MODULE_AUTHOR("Wyon Bi <bivvy.bi@rock-chips.com>");
-MODULE_DESCRIPTION("Lontium LT8912 MIPI-DSI to LVDS and HDMI/MHL bridge");
-MODULE_LICENSE("GPL v2");