--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2022 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <log.h>
+#include <misc.h>
+#include <mipi_display.h>
+#include <mipi_dsi.h>
+#include <backlight.h>
+#include <panel.h>
+#include <spi.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <asm/gpio.h>
+
+#define SSD2825_DEVICE_ID_REG 0xB0
+#define SSD2825_RGB_INTERFACE_CTRL_REG_1 0xB1
+#define SSD2825_RGB_INTERFACE_CTRL_REG_2 0xB2
+#define SSD2825_RGB_INTERFACE_CTRL_REG_3 0xB3
+#define SSD2825_RGB_INTERFACE_CTRL_REG_4 0xB4
+#define SSD2825_RGB_INTERFACE_CTRL_REG_5 0xB5
+#define SSD2825_RGB_INTERFACE_CTRL_REG_6 0xB6
+#define SSD2825_NON_BURST BIT(2)
+#define SSD2825_BURST BIT(3)
+#define SSD2825_PCKL_HIGH BIT(13)
+#define SSD2825_HSYNC_HIGH BIT(14)
+#define SSD2825_VSYNC_HIGH BIT(15)
+#define SSD2825_CONFIGURATION_REG 0xB7
+#define SSD2825_CONF_REG_HS BIT(0)
+#define SSD2825_CONF_REG_CKE BIT(1)
+#define SSD2825_CONF_REG_SLP BIT(2)
+#define SSD2825_CONF_REG_VEN BIT(3)
+#define SSD2825_CONF_REG_HCLK BIT(4)
+#define SSD2825_CONF_REG_CSS BIT(5)
+#define SSD2825_CONF_REG_DCS BIT(6)
+#define SSD2825_CONF_REG_REN BIT(7)
+#define SSD2825_CONF_REG_ECD BIT(8)
+#define SSD2825_CONF_REG_EOT BIT(9)
+#define SSD2825_CONF_REG_LPE BIT(10)
+#define SSD2825_VC_CTRL_REG 0xB8
+#define SSD2825_PLL_CTRL_REG 0xB9
+#define SSD2825_PLL_CONFIGURATION_REG 0xBA
+#define SSD2825_CLOCK_CTRL_REG 0xBB
+#define SSD2825_PACKET_SIZE_CTRL_REG_1 0xBC
+#define SSD2825_PACKET_SIZE_CTRL_REG_2 0xBD
+#define SSD2825_PACKET_SIZE_CTRL_REG_3 0xBE
+#define SSD2825_PACKET_DROP_REG 0xBF
+#define SSD2825_OPERATION_CTRL_REG 0xC0
+#define SSD2825_MAX_RETURN_SIZE_REG 0xC1
+#define SSD2825_RETURN_DATA_COUNT_REG 0xC2
+#define SSD2825_ACK_RESPONSE_REG 0xC3
+#define SSD2825_LINE_CTRL_REG 0xC4
+#define SSD2825_INTERRUPT_CTRL_REG 0xC5
+#define SSD2825_INTERRUPT_STATUS_REG 0xC6
+#define SSD2825_ERROR_STATUS_REG 0xC7
+#define SSD2825_DATA_FORMAT_REG 0xC8
+#define SSD2825_DELAY_ADJ_REG_1 0xC9
+#define SSD2825_DELAY_ADJ_REG_2 0xCA
+#define SSD2825_DELAY_ADJ_REG_3 0xCB
+#define SSD2825_DELAY_ADJ_REG_4 0xCC
+#define SSD2825_DELAY_ADJ_REG_5 0xCD
+#define SSD2825_DELAY_ADJ_REG_6 0xCE
+#define SSD2825_HS_TX_TIMER_REG_1 0xCF
+#define SSD2825_HS_TX_TIMER_REG_2 0xD0
+#define SSD2825_LP_RX_TIMER_REG_1 0xD1
+#define SSD2825_LP_RX_TIMER_REG_2 0xD2
+#define SSD2825_TE_STATUS_REG 0xD3
+#define SSD2825_SPI_READ_REG 0xD4
+#define SSD2825_PLL_LOCK_REG 0xD5
+#define SSD2825_TEST_REG 0xD6
+#define SSD2825_TE_COUNT_REG 0xD7
+#define SSD2825_ANALOG_CTRL_REG_1 0xD8
+#define SSD2825_ANALOG_CTRL_REG_2 0xD9
+#define SSD2825_ANALOG_CTRL_REG_3 0xDA
+#define SSD2825_ANALOG_CTRL_REG_4 0xDB
+#define SSD2825_INTERRUPT_OUT_CTRL_REG 0xDC
+#define SSD2825_RGB_INTERFACE_CTRL_REG_7 0xDD
+#define SSD2825_LANE_CONFIGURATION_REG 0xDE
+#define SSD2825_DELAY_ADJ_REG_7 0xDF
+#define SSD2825_INPUT_PIN_CTRL_REG_1 0xE0
+#define SSD2825_INPUT_PIN_CTRL_REG_2 0xE1
+#define SSD2825_BIDIR_PIN_CTRL_REG_1 0xE2
+#define SSD2825_BIDIR_PIN_CTRL_REG_2 0xE3
+#define SSD2825_BIDIR_PIN_CTRL_REG_3 0xE4
+#define SSD2825_BIDIR_PIN_CTRL_REG_4 0xE5
+#define SSD2825_BIDIR_PIN_CTRL_REG_5 0xE6
+#define SSD2825_BIDIR_PIN_CTRL_REG_6 0xE7
+#define SSD2825_BIDIR_PIN_CTRL_REG_7 0xE8
+#define SSD2825_CABC_BRIGHTNESS_CTRL_REG_1 0xE9
+#define SSD2825_CABC_BRIGHTNESS_CTRL_REG_2 0xEA
+#define SSD2825_CABC_BRIGHTNESS_STATUS_REG 0xEB
+#define SSD2825_READ_REG 0xFF
+#define SSD2825_SPI_READ_REG_RESET 0xFA
+
+#define SSD2825_CMD_MASK 0x00
+#define SSD2825_DAT_MASK 0x01
+
+#define SSD2825_CMD_SEND BIT(0)
+#define SSD2825_DAT_SEND BIT(1)
+#define SSD2825_DSI_SEND BIT(2)
+
+#define SSD2828_LP_CLOCK_DIVIDER(n) (((n) - 1) & 0x3F)
+#define SSD2825_LP_MIN_CLK 5000 /* KHz */
+#define SSD2825_REF_MIN_CLK 2000 /* KHz */
+
+struct ssd2825_bridge_priv {
+ struct mipi_dsi_host host;
+ struct mipi_dsi_device device;
+
+ struct udevice *panel;
+ struct display_timing timing;
+
+ struct gpio_desc power_gpio;
+ struct gpio_desc reset_gpio;
+
+ struct clk *tx_clk;
+
+ u32 pll_freq_kbps; /* PLL in kbps */
+};
+
+static int ssd2825_spi_write(struct udevice *dev, int reg,
+ const void *buf, int flags)
+{
+ u8 command[2];
+
+ if (flags & SSD2825_CMD_SEND) {
+ command[0] = SSD2825_CMD_MASK;
+ command[1] = reg;
+ dm_spi_xfer(dev, 9, &command,
+ NULL, SPI_XFER_ONCE);
+ }
+
+ if (flags & SSD2825_DAT_SEND) {
+ u16 data = *(u16 *)buf;
+ u8 cmd1, cmd2;
+
+ /* send low byte first and then high byte */
+ cmd1 = (data & 0x00FF);
+ cmd2 = (data & 0xFF00) >> 8;
+
+ command[0] = SSD2825_DAT_MASK;
+ command[1] = cmd1;
+ dm_spi_xfer(dev, 9, &command,
+ NULL, SPI_XFER_ONCE);
+
+ command[0] = SSD2825_DAT_MASK;
+ command[1] = cmd2;
+ dm_spi_xfer(dev, 9, &command,
+ NULL, SPI_XFER_ONCE);
+ }
+
+ if (flags & SSD2825_DSI_SEND) {
+ u16 data = *(u16 *)buf;
+ data &= 0x00FF;
+
+ debug("%s: dsi command (0x%x)\n",
+ __func__, data);
+
+ command[0] = SSD2825_DAT_MASK;
+ command[1] = data;
+ dm_spi_xfer(dev, 9, &command,
+ NULL, SPI_XFER_ONCE);
+ }
+
+ return 0;
+}
+
+static int ssd2825_spi_read(struct udevice *dev, int reg,
+ void *data, int flags)
+{
+ u8 command[2];
+
+ command[0] = SSD2825_CMD_MASK;
+ command[1] = SSD2825_SPI_READ_REG;
+ dm_spi_xfer(dev, 9, &command,
+ NULL, SPI_XFER_ONCE);
+
+ command[0] = SSD2825_DAT_MASK;
+ command[1] = SSD2825_SPI_READ_REG_RESET;
+ dm_spi_xfer(dev, 9, &command,
+ NULL, SPI_XFER_ONCE);
+
+ command[0] = SSD2825_DAT_MASK;
+ command[1] = 0;
+ dm_spi_xfer(dev, 9, &command,
+ NULL, SPI_XFER_ONCE);
+
+ command[0] = SSD2825_CMD_MASK;
+ command[1] = reg;
+ dm_spi_xfer(dev, 9, &command,
+ NULL, SPI_XFER_ONCE);
+
+ command[0] = SSD2825_CMD_MASK;
+ command[1] = SSD2825_SPI_READ_REG_RESET;
+ dm_spi_xfer(dev, 9, &command,
+ NULL, SPI_XFER_ONCE);
+
+ dm_spi_xfer(dev, 16, NULL,
+ (u8 *)data, SPI_XFER_ONCE);
+
+ return 0;
+}
+
+static void ssd2825_write_register(struct udevice *dev, u8 reg,
+ u16 command)
+{
+ ssd2825_spi_write(dev, reg, &command,
+ SSD2825_CMD_SEND |
+ SSD2825_DAT_SEND);
+}
+
+static void ssd2825_write_dsi(struct udevice *dev, const u8 *command,
+ int len)
+{
+ int i;
+
+ ssd2825_spi_write(dev, SSD2825_PACKET_SIZE_CTRL_REG_1, &len,
+ SSD2825_CMD_SEND | SSD2825_DAT_SEND);
+
+ ssd2825_spi_write(dev, SSD2825_PACKET_DROP_REG, NULL,
+ SSD2825_CMD_SEND);
+
+ for (i = 0; i < len; i++)
+ ssd2825_spi_write(dev, 0, &command[i], SSD2825_DSI_SEND);
+}
+
+static ssize_t ssd2825_bridge_transfer(struct mipi_dsi_host *host,
+ const struct mipi_dsi_msg *msg)
+{
+ struct udevice *dev = (struct udevice *)host->dev;
+ u8 buf = *(u8 *)msg->tx_buf;
+ u16 config;
+ int ret;
+
+ ret = ssd2825_spi_read(dev, SSD2825_CONFIGURATION_REG,
+ &config, 0);
+ if (ret)
+ return ret;
+
+ switch (msg->type) {
+ case MIPI_DSI_DCS_SHORT_WRITE:
+ case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
+ case MIPI_DSI_DCS_LONG_WRITE:
+ config |= SSD2825_CONF_REG_DCS;
+ break;
+ case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
+ case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
+ case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
+ case MIPI_DSI_GENERIC_LONG_WRITE:
+ config &= ~SSD2825_CONF_REG_DCS;
+ break;
+ default:
+ return 0;
+ }
+
+ ssd2825_write_register(dev, SSD2825_CONFIGURATION_REG, config);
+ ssd2825_write_register(dev, SSD2825_VC_CTRL_REG, 0x0000);
+ ssd2825_write_dsi(dev, msg->tx_buf, msg->tx_len);
+
+ if (buf == MIPI_DCS_SET_DISPLAY_ON) {
+ ssd2825_write_register(dev, SSD2825_CONFIGURATION_REG,
+ SSD2825_CONF_REG_HS | SSD2825_CONF_REG_VEN |
+ SSD2825_CONF_REG_DCS | SSD2825_CONF_REG_ECD |
+ SSD2825_CONF_REG_EOT);
+ ssd2825_write_register(dev, SSD2825_PLL_CTRL_REG, 0x0001);
+ ssd2825_write_register(dev, SSD2825_VC_CTRL_REG, 0x0000);
+ }
+
+ return 0;
+}
+
+static const struct mipi_dsi_host_ops ssd2825_bridge_host_ops = {
+ .transfer = ssd2825_bridge_transfer,
+};
+
+/*
+ * PLL configuration register settings.
+ *
+ * See the "PLL Configuration Register Description" in the SSD2825 datasheet.
+ */
+static u16 construct_pll_config(struct ssd2825_bridge_priv *priv,
+ u32 desired_pll_freq_kbps, u32 reference_freq_khz)
+{
+ u32 div_factor = 1, mul_factor, fr = 0;
+
+ while (reference_freq_khz / (div_factor + 1) >= SSD2825_REF_MIN_CLK)
+ div_factor++;
+ if (div_factor > 31)
+ div_factor = 31;
+
+ mul_factor = DIV_ROUND_UP(desired_pll_freq_kbps * div_factor,
+ reference_freq_khz);
+
+ priv->pll_freq_kbps = reference_freq_khz * mul_factor / div_factor;
+
+ if (priv->pll_freq_kbps >= 501000)
+ fr = 3;
+ else if (priv->pll_freq_kbps >= 251000)
+ fr = 2;
+ else if (priv->pll_freq_kbps >= 126000)
+ fr = 1;
+
+ return (fr << 14) | (div_factor << 8) | mul_factor;
+}
+
+static void ssd2825_setup_pll(struct udevice *dev)
+{
+ struct ssd2825_bridge_priv *priv = dev_get_priv(dev);
+ struct mipi_dsi_device *device = &priv->device;
+ struct display_timing *dt = &priv->timing;
+ u16 pll_config, lp_div;
+ u32 pclk_mult, tx_freq_khz, pd_lines;
+
+ tx_freq_khz = clk_get_rate(priv->tx_clk) / 1000;
+ pd_lines = mipi_dsi_pixel_format_to_bpp(device->format);
+ pclk_mult = pd_lines / device->lanes + 1;
+
+ pll_config = construct_pll_config(priv, pclk_mult *
+ dt->pixelclock.typ / 1000,
+ tx_freq_khz);
+
+ lp_div = priv->pll_freq_kbps / (SSD2825_LP_MIN_CLK * 8);
+
+ /* Disable PLL */
+ ssd2825_write_register(dev, SSD2825_PLL_CTRL_REG, 0x0000);
+ ssd2825_write_register(dev, SSD2825_LINE_CTRL_REG, 0x0001);
+
+ /* Set delays */
+ ssd2825_write_register(dev, SSD2825_DELAY_ADJ_REG_1, 0x2103);
+
+ /* Set PLL coeficients */
+ ssd2825_write_register(dev, SSD2825_PLL_CONFIGURATION_REG, pll_config);
+
+ /* Clock Control Register */
+ ssd2825_write_register(dev, SSD2825_CLOCK_CTRL_REG,
+ SSD2828_LP_CLOCK_DIVIDER(lp_div));
+
+ /* Enable PLL */
+ ssd2825_write_register(dev, SSD2825_PLL_CTRL_REG, 0x0001);
+ ssd2825_write_register(dev, SSD2825_VC_CTRL_REG, 0x0000);
+}
+
+static int ssd2825_bridge_enable_panel(struct udevice *dev)
+{
+ struct ssd2825_bridge_priv *priv = dev_get_priv(dev);
+ struct mipi_dsi_device *device = &priv->device;
+ struct display_timing *dt = &priv->timing;
+ int ret;
+
+ ret = clk_prepare_enable(priv->tx_clk);
+ if (ret) {
+ log_err("error enabling tx_clk (%d)\n", ret);
+ return ret;
+ }
+
+ ret = dm_gpio_set_value(&priv->power_gpio, 1);
+ if (ret) {
+ log_err("error changing power-gpios (%d)\n", ret);
+ return ret;
+ }
+ mdelay(10);
+
+ ret = dm_gpio_set_value(&priv->reset_gpio, 0);
+ if (ret) {
+ log_err("error changing reset-gpios (%d)\n", ret);
+ return ret;
+ }
+ mdelay(10);
+
+ ret = dm_gpio_set_value(&priv->reset_gpio, 1);
+ if (ret) {
+ log_err("error changing reset-gpios (%d)\n", ret);
+ return ret;
+ }
+ mdelay(10);
+
+ /* Perform panel HW setup */
+ ret = panel_enable_backlight(priv->panel);
+ if (ret)
+ return ret;
+
+ /* Perform SW reset */
+ ssd2825_write_register(dev, SSD2825_OPERATION_CTRL_REG, 0x0100);
+
+ /* Set panel timings */
+ ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_1,
+ dt->vsync_len.typ << 8 | dt->hsync_len.typ);
+ ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_2,
+ (dt->vsync_len.typ + dt->vback_porch.typ) << 8 |
+ (dt->hsync_len.typ + dt->hback_porch.typ));
+ ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_3,
+ dt->vfront_porch.typ << 8 | dt->hfront_porch.typ);
+ ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_4,
+ dt->hactive.typ);
+ ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_5,
+ dt->vactive.typ);
+ ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_6,
+ SSD2825_HSYNC_HIGH | SSD2825_VSYNC_HIGH |
+ SSD2825_PCKL_HIGH | SSD2825_NON_BURST |
+ (3 - device->format));
+ ssd2825_write_register(dev, SSD2825_LANE_CONFIGURATION_REG,
+ device->lanes - 1);
+ ssd2825_write_register(dev, SSD2825_TEST_REG, 0x0004);
+
+ /* Call PLL configuration */
+ ssd2825_setup_pll(dev);
+
+ mdelay(10);
+
+ /* Initial DSI configuration register set */
+ ssd2825_write_register(dev, SSD2825_CONFIGURATION_REG,
+ SSD2825_CONF_REG_CKE | SSD2825_CONF_REG_DCS |
+ SSD2825_CONF_REG_ECD | SSD2825_CONF_REG_EOT);
+ ssd2825_write_register(dev, SSD2825_VC_CTRL_REG, 0x0000);
+
+ /* Set up SW panel configuration */
+ ret = panel_set_backlight(priv->panel, BACKLIGHT_DEFAULT);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int ssd2825_bridge_set_panel(struct udevice *dev, int percent)
+{
+ return 0;
+}
+
+static int ssd2825_bridge_panel_timings(struct udevice *dev,
+ struct display_timing *timing)
+{
+ struct ssd2825_bridge_priv *priv = dev_get_priv(dev);
+
+ memcpy(timing, &priv->timing, sizeof(*timing));
+
+ return 0;
+}
+
+static int ssd2825_bridge_probe(struct udevice *dev)
+{
+ struct ssd2825_bridge_priv *priv = dev_get_priv(dev);
+ struct spi_slave *slave = dev_get_parent_priv(dev);
+ struct mipi_dsi_device *device = &priv->device;
+ struct mipi_dsi_panel_plat *mipi_plat;
+ int ret;
+
+ ret = spi_claim_bus(slave);
+ if (ret) {
+ log_err("SPI bus allocation failed (%d)\n", ret);
+ return ret;
+ }
+
+ ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev,
+ "panel", &priv->panel);
+ if (ret) {
+ log_err("cannot get panel: ret=%d\n", ret);
+ return ret;
+ }
+
+ panel_get_display_timing(priv->panel, &priv->timing);
+
+ mipi_plat = dev_get_plat(priv->panel);
+ mipi_plat->device = device;
+
+ priv->host.dev = (struct device *)dev;
+ priv->host.ops = &ssd2825_bridge_host_ops;
+
+ device->host = &priv->host;
+ device->lanes = mipi_plat->lanes;
+ device->format = mipi_plat->format;
+ device->mode_flags = mipi_plat->mode_flags;
+
+ /* get panel gpios */
+ ret = gpio_request_by_name(dev, "power-gpios", 0,
+ &priv->power_gpio, GPIOD_IS_OUT);
+ if (ret) {
+ log_err("could not decode power-gpios (%d)\n", ret);
+ return ret;
+ }
+
+ ret = gpio_request_by_name(dev, "reset-gpios", 0,
+ &priv->reset_gpio, GPIOD_IS_OUT);
+ if (ret) {
+ log_err("could not decode reset-gpios (%d)\n", ret);
+ return ret;
+ }
+
+ /* get clk */
+ priv->tx_clk = devm_clk_get(dev, "tx_clk");
+ if (IS_ERR(priv->tx_clk)) {
+ log_err("cannot get tx_clk: %ld\n", PTR_ERR(priv->tx_clk));
+ return PTR_ERR(priv->tx_clk);
+ }
+
+ return 0;
+}
+
+static const struct panel_ops ssd2825_bridge_ops = {
+ .enable_backlight = ssd2825_bridge_enable_panel,
+ .set_backlight = ssd2825_bridge_set_panel,
+ .get_display_timing = ssd2825_bridge_panel_timings,
+};
+
+static const struct udevice_id ssd2825_bridge_ids[] = {
+ { .compatible = "solomon,ssd2825" },
+ { }
+};
+
+U_BOOT_DRIVER(ssd2825) = {
+ .name = "ssd2825",
+ .id = UCLASS_PANEL,
+ .of_match = ssd2825_bridge_ids,
+ .ops = &ssd2825_bridge_ops,
+ .probe = ssd2825_bridge_probe,
+ .priv_auto = sizeof(struct ssd2825_bridge_priv),
+};
projects / u-boot.git / commitdiff