--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Texas Instruments Incorporated
+ * Copyright (C) 2022 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <clk.h>
+#include <dm.h>
+#include <i2c.h>
+#include <log.h>
+#include <mipi_display.h>
+#include <mipi_dsi.h>
+#include <backlight.h>
+#include <panel.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <power/regulator.h>
+
+#include <asm/gpio.h>
+
+/* Global (16-bit addressable) */
+#define TC358768_CHIPID 0x0000
+#define TC358768_SYSCTL 0x0002
+#define TC358768_CONFCTL 0x0004
+#define TC358768_VSDLY 0x0006
+#define TC358768_DATAFMT 0x0008
+#define TC358768_GPIOEN 0x000E
+#define TC358768_GPIODIR 0x0010
+#define TC358768_GPIOIN 0x0012
+#define TC358768_GPIOOUT 0x0014
+#define TC358768_PLLCTL0 0x0016
+#define TC358768_PLLCTL1 0x0018
+#define TC358768_CMDBYTE 0x0022
+#define TC358768_PP_MISC 0x0032
+#define TC358768_DSITX_DT 0x0050
+#define TC358768_FIFOSTATUS 0x00F8
+
+/* Debug (16-bit addressable) */
+#define TC358768_VBUFCTRL 0x00E0
+#define TC358768_DBG_WIDTH 0x00E2
+#define TC358768_DBG_VBLANK 0x00E4
+#define TC358768_DBG_DATA 0x00E8
+
+/* TX PHY (32-bit addressable) */
+#define TC358768_CLW_DPHYCONTTX 0x0100
+#define TC358768_D0W_DPHYCONTTX 0x0104
+#define TC358768_D1W_DPHYCONTTX 0x0108
+#define TC358768_D2W_DPHYCONTTX 0x010C
+#define TC358768_D3W_DPHYCONTTX 0x0110
+#define TC358768_CLW_CNTRL 0x0140
+#define TC358768_D0W_CNTRL 0x0144
+#define TC358768_D1W_CNTRL 0x0148
+#define TC358768_D2W_CNTRL 0x014C
+#define TC358768_D3W_CNTRL 0x0150
+
+/* TX PPI (32-bit addressable) */
+#define TC358768_STARTCNTRL 0x0204
+#define TC358768_DSITXSTATUS 0x0208
+#define TC358768_LINEINITCNT 0x0210
+#define TC358768_LPTXTIMECNT 0x0214
+#define TC358768_TCLK_HEADERCNT 0x0218
+#define TC358768_TCLK_TRAILCNT 0x021C
+#define TC358768_THS_HEADERCNT 0x0220
+#define TC358768_TWAKEUP 0x0224
+#define TC358768_TCLK_POSTCNT 0x0228
+#define TC358768_THS_TRAILCNT 0x022C
+#define TC358768_HSTXVREGCNT 0x0230
+#define TC358768_HSTXVREGEN 0x0234
+#define TC358768_TXOPTIONCNTRL 0x0238
+#define TC358768_BTACNTRL1 0x023C
+
+/* TX CTRL (32-bit addressable) */
+#define TC358768_DSI_CONTROL 0x040C
+#define TC358768_DSI_STATUS 0x0410
+#define TC358768_DSI_INT 0x0414
+#define TC358768_DSI_INT_ENA 0x0418
+#define TC358768_DSICMD_RDFIFO 0x0430
+#define TC358768_DSI_ACKERR 0x0434
+#define TC358768_DSI_ACKERR_INTENA 0x0438
+#define TC358768_DSI_ACKERR_HALT 0x043c
+#define TC358768_DSI_RXERR 0x0440
+#define TC358768_DSI_RXERR_INTENA 0x0444
+#define TC358768_DSI_RXERR_HALT 0x0448
+#define TC358768_DSI_ERR 0x044C
+#define TC358768_DSI_ERR_INTENA 0x0450
+#define TC358768_DSI_ERR_HALT 0x0454
+#define TC358768_DSI_CONFW 0x0500
+#define TC358768_DSI_LPCMD 0x0500
+#define TC358768_DSI_RESET 0x0504
+#define TC358768_DSI_INT_CLR 0x050C
+#define TC358768_DSI_START 0x0518
+
+/* DSITX CTRL (16-bit addressable) */
+#define TC358768_DSICMD_TX 0x0600
+#define TC358768_DSICMD_TYPE 0x0602
+#define TC358768_DSICMD_WC 0x0604
+#define TC358768_DSICMD_WD0 0x0610
+#define TC358768_DSICMD_WD1 0x0612
+#define TC358768_DSICMD_WD2 0x0614
+#define TC358768_DSICMD_WD3 0x0616
+#define TC358768_DSI_EVENT 0x0620
+#define TC358768_DSI_VSW 0x0622
+#define TC358768_DSI_VBPR 0x0624
+#define TC358768_DSI_VACT 0x0626
+#define TC358768_DSI_HSW 0x0628
+#define TC358768_DSI_HBPR 0x062A
+#define TC358768_DSI_HACT 0x062C
+
+/* TC358768_DSI_CONTROL (0x040C) register */
+#define TC358768_DSI_CONTROL_DIS_MODE BIT(15)
+#define TC358768_DSI_CONTROL_TXMD BIT(7)
+#define TC358768_DSI_CONTROL_HSCKMD BIT(5)
+#define TC358768_DSI_CONTROL_EOTDIS BIT(0)
+
+/* TC358768_DSI_CONFW (0x0500) register */
+#define TC358768_DSI_CONFW_MODE_SET (5 << 29)
+#define TC358768_DSI_CONFW_MODE_CLR (6 << 29)
+#define TC358768_DSI_CONFW_ADDR_DSI_CONTROL (3 << 24)
+
+#define NANO 1000000000UL
+#define PICO 1000000000000ULL
+
+struct tc358768_priv {
+ struct mipi_dsi_host host;
+ struct mipi_dsi_device device;
+
+ struct udevice *panel;
+ struct display_timing timing;
+
+ struct udevice *vddc;
+ struct udevice *vddmipi;
+ struct udevice *vddio;
+
+ struct clk *refclk;
+
+ struct gpio_desc reset_gpio;
+
+ u32 pd_lines; /* number of Parallel Port Input Data Lines */
+ u32 dsi_lanes; /* number of DSI Lanes */
+
+ /* Parameters for PLL programming */
+ u32 fbd; /* PLL feedback divider */
+ u32 prd; /* PLL input divider */
+ u32 frs; /* PLL Freqency range for HSCK (post divider) */
+
+ u32 dsiclk; /* pll_clk / 2 */
+};
+
+static void tc358768_read(struct udevice *dev, u32 reg, u32 *val)
+{
+ int count;
+ u8 buf[4] = { 0, 0, 0, 0 };
+
+ /* 16-bit register? */
+ if (reg < 0x100 || reg >= 0x600)
+ count = 2;
+ else
+ count = 4;
+
+ dm_i2c_read(dev, reg, buf, count);
+ *val = (buf[0] << 8) | (buf[1] & 0xff) |
+ (buf[2] << 24) | (buf[3] << 16);
+
+ log_debug("%s 0x%04x >> 0x%08x\n",
+ __func__, reg, *val);
+}
+
+static void tc358768_write(struct udevice *dev, u32 reg, u32 val)
+{
+ int count;
+ u8 buf[4];
+
+ /* 16-bit register? */
+ if (reg < 0x100 || reg >= 0x600)
+ count = 2;
+ else
+ count = 4;
+
+ buf[0] = val >> 8;
+ buf[1] = val & 0xff;
+ buf[2] = val >> 24;
+ buf[3] = val >> 16;
+
+ log_debug("%s 0x%04x << 0x%08x\n",
+ __func__, reg, val);
+
+ dm_i2c_write(dev, reg, buf, count);
+}
+
+static void tc358768_update_bits(struct udevice *dev, u32 reg, u32 mask,
+ u32 val)
+{
+ u32 tmp, orig;
+
+ tc358768_read(dev, reg, &orig);
+
+ tmp = orig & ~mask;
+ tmp |= val & mask;
+ if (tmp != orig)
+ tc358768_write(dev, reg, tmp);
+}
+
+static ssize_t tc358768_dsi_host_transfer(struct mipi_dsi_host *host,
+ const struct mipi_dsi_msg *msg)
+{
+ struct udevice *dev = (struct udevice *)host->dev;
+ struct mipi_dsi_packet packet;
+ int ret;
+
+ if (msg->rx_len) {
+ log_debug("%s: MIPI rx is not supported\n", __func__);
+ return -EOPNOTSUPP;
+ }
+
+ if (msg->tx_len > 8) {
+ log_debug("%s: Maximum 8 byte MIPI tx is supported\n", __func__);
+ return -EOPNOTSUPP;
+ }
+
+ ret = mipi_dsi_create_packet(&packet, msg);
+ if (ret)
+ return ret;
+
+ if (mipi_dsi_packet_format_is_short(msg->type)) {
+ tc358768_write(dev, TC358768_DSICMD_TYPE,
+ (0x10 << 8) | (packet.header[0] & 0x3f));
+ tc358768_write(dev, TC358768_DSICMD_WC, 0);
+ tc358768_write(dev, TC358768_DSICMD_WD0,
+ (packet.header[2] << 8) | packet.header[1]);
+ } else {
+ int i;
+
+ tc358768_write(dev, TC358768_DSICMD_TYPE,
+ (0x40 << 8) | (packet.header[0] & 0x3f));
+ tc358768_write(dev, TC358768_DSICMD_WC, packet.payload_length);
+ for (i = 0; i < packet.payload_length; i += 2) {
+ u16 val = packet.payload[i];
+
+ if (i + 1 < packet.payload_length)
+ val |= packet.payload[i + 1] << 8;
+
+ tc358768_write(dev, TC358768_DSICMD_WD0 + i, val);
+ }
+ }
+
+ /* start transfer */
+ tc358768_write(dev, TC358768_DSICMD_TX, 1);
+
+ return packet.size;
+}
+
+static const struct mipi_dsi_host_ops tc358768_dsi_host_ops = {
+ .transfer = tc358768_dsi_host_transfer,
+};
+
+static void tc358768_sw_reset(struct udevice *dev)
+{
+ /* Assert Reset */
+ tc358768_write(dev, TC358768_SYSCTL, 1);
+ mdelay(5);
+
+ /* Release Reset, Exit Sleep */
+ tc358768_write(dev, TC358768_SYSCTL, 0);
+}
+
+static void tc358768_hw_enable(struct tc358768_priv *priv)
+{
+ int ret;
+
+ ret = clk_prepare_enable(priv->refclk);
+ if (ret)
+ log_debug("%s: error enabling refclk (%d)\n", __func__, ret);
+
+ ret = regulator_set_enable_if_allowed(priv->vddc, true);
+ if (ret)
+ log_debug("%s: error enabling vddc (%d)\n", __func__, ret);
+
+ ret = regulator_set_enable_if_allowed(priv->vddmipi, true);
+ if (ret)
+ log_debug("%s: error enabling vddmipi (%d)\n", __func__, ret);
+
+ mdelay(10);
+
+ ret = regulator_set_enable_if_allowed(priv->vddio, true);
+ if (ret)
+ log_debug("%s: error enabling vddio (%d)\n", __func__, ret);
+
+ mdelay(2);
+
+ /*
+ * The RESX is active low (GPIO_ACTIVE_LOW).
+ * DEASSERT (value = 0) the reset_gpio to enable the chip
+ */
+ ret = dm_gpio_set_value(&priv->reset_gpio, 0);
+ if (ret)
+ log_debug("%s: error changing reset-gpio (%d)\n", __func__, ret);
+
+ /* wait for encoder clocks to stabilize */
+ mdelay(2);
+}
+
+static u32 tc358768_pclk_to_pll(struct tc358768_priv *priv, u32 pclk)
+{
+ return (u32)div_u64((u64)pclk * priv->pd_lines, priv->dsi_lanes);
+}
+
+static int tc358768_calc_pll(struct tc358768_priv *priv,
+ struct display_timing *dt)
+{
+ static const u32 frs_limits[] = {
+ 1000000000,
+ 500000000,
+ 250000000,
+ 125000000,
+ 62500000
+ };
+ unsigned long refclk;
+ u32 prd, target_pll, i, max_pll, min_pll;
+ u32 frs, best_diff, best_pll, best_prd, best_fbd;
+
+ target_pll = tc358768_pclk_to_pll(priv, dt->pixelclock.typ);
+
+ /* pll_clk = RefClk * FBD / PRD * (1 / (2^FRS)) */
+
+ for (i = 0; i < ARRAY_SIZE(frs_limits); i++)
+ if (target_pll >= frs_limits[i])
+ break;
+
+ if (i == ARRAY_SIZE(frs_limits) || i == 0)
+ return -EINVAL;
+
+ frs = i - 1;
+ max_pll = frs_limits[i - 1];
+ min_pll = frs_limits[i];
+
+ refclk = clk_get_rate(priv->refclk);
+
+ best_diff = UINT_MAX;
+ best_pll = 0;
+ best_prd = 0;
+ best_fbd = 0;
+
+ for (prd = 1; prd <= 16; ++prd) {
+ u32 divisor = prd * (1 << frs);
+ u32 fbd;
+
+ for (fbd = 1; fbd <= 512; ++fbd) {
+ u32 pll, diff, pll_in;
+
+ pll = (u32)div_u64((u64)refclk * fbd, divisor);
+
+ if (pll >= max_pll || pll < min_pll)
+ continue;
+
+ pll_in = (u32)div_u64((u64)refclk, prd);
+ if (pll_in < 4000000)
+ continue;
+
+ diff = max(pll, target_pll) - min(pll, target_pll);
+
+ if (diff < best_diff) {
+ best_diff = diff;
+ best_pll = pll;
+ best_prd = prd;
+ best_fbd = fbd;
+
+ if (best_diff == 0)
+ goto found;
+ }
+ }
+ }
+
+ if (best_diff == UINT_MAX) {
+ log_debug("%s: could not find suitable PLL setup\n", __func__);
+ return -EINVAL;
+ }
+
+found:
+ priv->fbd = best_fbd;
+ priv->prd = best_prd;
+ priv->frs = frs;
+ priv->dsiclk = best_pll / 2;
+
+ return 0;
+}
+
+static void tc358768_setup_pll(struct udevice *dev)
+{
+ struct tc358768_priv *priv = dev_get_priv(dev);
+ u32 fbd, prd, frs;
+ int ret;
+
+ ret = tc358768_calc_pll(priv, &priv->timing);
+ if (ret)
+ log_debug("%s: PLL calculation failed: %d\n", __func__, ret);
+
+ fbd = priv->fbd;
+ prd = priv->prd;
+ frs = priv->frs;
+
+ log_debug("%s: PLL: refclk %lu, fbd %u, prd %u, frs %u\n", __func__,
+ clk_get_rate(priv->refclk), fbd, prd, frs);
+ log_debug("%s: PLL: pll_clk: %u, DSIClk %u, HSByteClk %u\n", __func__,
+ priv->dsiclk * 2, priv->dsiclk, priv->dsiclk / 4);
+
+ /* PRD[15:12] FBD[8:0] */
+ tc358768_write(dev, TC358768_PLLCTL0, ((prd - 1) << 12) | (fbd - 1));
+
+ /* FRS[11:10] LBWS[9:8] CKEN[4] RESETB[1] EN[0] */
+ tc358768_write(dev, TC358768_PLLCTL1,
+ (frs << 10) | (0x2 << 8) | BIT(1) | BIT(0));
+
+ /* wait for lock */
+ mdelay(5);
+
+ /* FRS[11:10] LBWS[9:8] CKEN[4] PLL_CKEN[4] RESETB[1] EN[0] */
+ tc358768_write(dev, TC358768_PLLCTL1,
+ (frs << 10) | (0x2 << 8) | BIT(4) | BIT(1) | BIT(0));
+}
+
+static u32 tc358768_ns_to_cnt(u32 ns, u32 period_ps)
+{
+ return DIV_ROUND_UP(ns * 1000, period_ps);
+}
+
+static u32 tc358768_ps_to_ns(u32 ps)
+{
+ return ps / 1000;
+}
+
+static u32 tc358768_dpi_to_ns(u32 val, u32 pclk)
+{
+ return (u32)div_u64((u64)val * NANO, pclk);
+}
+
+/* Convert value in DPI pixel clock units to DSI byte count */
+static u32 tc358768_dpi_to_dsi_bytes(struct tc358768_priv *priv, u32 val)
+{
+ u64 m = (u64)val * priv->dsiclk / 4 * priv->dsi_lanes;
+ u64 n = priv->timing.pixelclock.typ;
+
+ return (u32)div_u64(m + n - 1, n);
+}
+
+static u32 tc358768_dsi_bytes_to_ns(struct tc358768_priv *priv, u32 val)
+{
+ u64 m = (u64)val * NANO;
+ u64 n = priv->dsiclk / 4 * priv->dsi_lanes;
+
+ return (u32)div_u64(m, n);
+}
+
+static int tc358768_attach(struct udevice *dev)
+{
+ struct tc358768_priv *priv = dev_get_priv(dev);
+ struct mipi_dsi_device *device = &priv->device;
+ struct display_timing *dt = &priv->timing;
+ u32 val, val2, lptxcnt, hact, data_type;
+ s32 raw_val;
+ u32 hsbyteclk_ps, dsiclk_ps, ui_ps;
+ u32 dsiclk, hsbyteclk;
+ int i;
+ /* In pixelclock units */
+ u32 dpi_htot, dpi_data_start;
+ /* In byte units */
+ u32 dsi_dpi_htot, dsi_dpi_data_start;
+ u32 dsi_hsw, dsi_hbp, dsi_hact, dsi_hfp;
+ const u32 dsi_hss = 4; /* HSS is a short packet (4 bytes) */
+ /* In hsbyteclk units */
+ u32 dsi_vsdly;
+ const u32 internal_dly = 40;
+
+ if (device->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) {
+ debug("%s: Non-continuous mode unimplemented, falling back to continuous\n", __func__);
+ device->mode_flags &= ~MIPI_DSI_CLOCK_NON_CONTINUOUS;
+ }
+
+ tc358768_hw_enable(priv);
+ tc358768_sw_reset(dev);
+
+ tc358768_setup_pll(dev);
+
+ dsiclk = priv->dsiclk;
+ hsbyteclk = dsiclk / 4;
+
+ /* Data Format Control Register */
+ val = BIT(2) | BIT(1) | BIT(0); /* rdswap_en | dsitx_en | txdt_en */
+ switch (device->format) {
+ case MIPI_DSI_FMT_RGB888:
+ val |= (0x3 << 4);
+ hact = dt->hactive.typ * 3;
+ data_type = MIPI_DSI_PACKED_PIXEL_STREAM_24;
+ break;
+ case MIPI_DSI_FMT_RGB666:
+ val |= (0x4 << 4);
+ hact = dt->hactive.typ * 3;
+ data_type = MIPI_DSI_PACKED_PIXEL_STREAM_18;
+ break;
+ case MIPI_DSI_FMT_RGB666_PACKED:
+ val |= (0x4 << 4) | BIT(3);
+ hact = dt->hactive.typ * 18 / 8;
+ data_type = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
+ break;
+ case MIPI_DSI_FMT_RGB565:
+ val |= (0x5 << 4);
+ hact = dt->hactive.typ * 2;
+ data_type = MIPI_DSI_PACKED_PIXEL_STREAM_16;
+ break;
+ default:
+ log_debug("%s: Invalid data format (%u)\n",
+ __func__, device->format);
+ return -EINVAL;
+ }
+
+ /*
+ * There are three important things to make TC358768 work correctly,
+ * which are not trivial to manage:
+ *
+ * 1. Keep the DPI line-time and the DSI line-time as close to each
+ * other as possible.
+ * 2. TC358768 goes to LP mode after each line's active area. The DSI
+ * HFP period has to be long enough for entering and exiting LP mode.
+ * But it is not clear how to calculate this.
+ * 3. VSDly (video start delay) has to be long enough to ensure that the
+ * DSI TX does not start transmitting until we have started receiving
+ * pixel data from the DPI input. It is not clear how to calculate
+ * this either.
+ */
+
+ dpi_htot = dt->hactive.typ + dt->hfront_porch.typ +
+ dt->hsync_len.typ + dt->hback_porch.typ;
+ dpi_data_start = dt->hsync_len.typ + dt->hback_porch.typ;
+
+ log_debug("%s: dpi horiz timing (pclk): %u + %u + %u + %u = %u\n", __func__,
+ dt->hsync_len.typ, dt->hback_porch.typ, dt->hactive.typ,
+ dt->hfront_porch.typ, dpi_htot);
+
+ log_debug("%s: dpi horiz timing (ns): %u + %u + %u + %u = %u\n", __func__,
+ tc358768_dpi_to_ns(dt->hsync_len.typ, dt->pixelclock.typ),
+ tc358768_dpi_to_ns(dt->hback_porch.typ, dt->pixelclock.typ),
+ tc358768_dpi_to_ns(dt->hactive.typ, dt->pixelclock.typ),
+ tc358768_dpi_to_ns(dt->hfront_porch.typ, dt->pixelclock.typ),
+ tc358768_dpi_to_ns(dpi_htot, dt->pixelclock.typ));
+
+ log_debug("%s: dpi data start (ns): %u + %u = %u\n", __func__,
+ tc358768_dpi_to_ns(dt->hsync_len.typ, dt->pixelclock.typ),
+ tc358768_dpi_to_ns(dt->hback_porch.typ, dt->pixelclock.typ),
+ tc358768_dpi_to_ns(dpi_data_start, dt->pixelclock.typ));
+
+ dsi_dpi_htot = tc358768_dpi_to_dsi_bytes(priv, dpi_htot);
+ dsi_dpi_data_start = tc358768_dpi_to_dsi_bytes(priv, dpi_data_start);
+
+ if (device->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
+ dsi_hsw = tc358768_dpi_to_dsi_bytes(priv, dt->hsync_len.typ);
+ dsi_hbp = tc358768_dpi_to_dsi_bytes(priv, dt->hback_porch.typ);
+ } else {
+ /* HBP is included in HSW in event mode */
+ dsi_hbp = 0;
+ dsi_hsw = tc358768_dpi_to_dsi_bytes(priv,
+ dt->hsync_len.typ +
+ dt->hback_porch.typ);
+
+ /*
+ * The pixel packet includes the actual pixel data, and:
+ * DSI packet header = 4 bytes
+ * DCS code = 1 byte
+ * DSI packet footer = 2 bytes
+ */
+ dsi_hact = hact + 4 + 1 + 2;
+
+ dsi_hfp = dsi_dpi_htot - dsi_hact - dsi_hsw - dsi_hss;
+
+ /*
+ * Here we should check if HFP is long enough for entering LP
+ * and exiting LP, but it's not clear how to calculate that.
+ * Instead, this is a naive algorithm that just adjusts the HFP
+ * and HSW so that HFP is (at least) roughly 2/3 of the total
+ * blanking time.
+ */
+ if (dsi_hfp < (dsi_hfp + dsi_hsw + dsi_hss) * 2 / 3) {
+ u32 old_hfp = dsi_hfp;
+ u32 old_hsw = dsi_hsw;
+ u32 tot = dsi_hfp + dsi_hsw + dsi_hss;
+
+ dsi_hsw = tot / 3;
+
+ /*
+ * Seems like sometimes HSW has to be divisible by num-lanes, but
+ * not always...
+ */
+ dsi_hsw = roundup(dsi_hsw, priv->dsi_lanes);
+
+ dsi_hfp = dsi_dpi_htot - dsi_hact - dsi_hsw - dsi_hss;
+
+ log_debug("%s: hfp too short, adjusting dsi hfp and dsi hsw from %u, %u to %u, %u\n",
+ __func__, old_hfp, old_hsw, dsi_hfp, dsi_hsw);
+ }
+
+ log_debug("%s: dsi horiz timing (bytes): %u, %u + %u + %u + %u = %u\n", __func__,
+ dsi_hss, dsi_hsw, dsi_hbp, dsi_hact, dsi_hfp,
+ dsi_hss + dsi_hsw + dsi_hbp + dsi_hact + dsi_hfp);
+
+ log_debug("%s: dsi horiz timing (ns): %u + %u + %u + %u + %u = %u\n", __func__,
+ tc358768_dsi_bytes_to_ns(priv, dsi_hss),
+ tc358768_dsi_bytes_to_ns(priv, dsi_hsw),
+ tc358768_dsi_bytes_to_ns(priv, dsi_hbp),
+ tc358768_dsi_bytes_to_ns(priv, dsi_hact),
+ tc358768_dsi_bytes_to_ns(priv, dsi_hfp),
+ tc358768_dsi_bytes_to_ns(priv, dsi_hss + dsi_hsw +
+ dsi_hbp + dsi_hact + dsi_hfp));
+ }
+
+ /* VSDly calculation */
+
+ /* Start with the HW internal delay */
+ dsi_vsdly = internal_dly;
+
+ /* Convert to byte units as the other variables are in byte units */
+ dsi_vsdly *= priv->dsi_lanes;
+
+ /* Do we need more delay, in addition to the internal? */
+ if (dsi_dpi_data_start > dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp) {
+ dsi_vsdly = dsi_dpi_data_start - dsi_hss - dsi_hsw - dsi_hbp;
+ dsi_vsdly = roundup(dsi_vsdly, priv->dsi_lanes);
+ }
+
+ log_debug("%s: dsi data start (bytes) %u + %u + %u + %u = %u\n", __func__,
+ dsi_vsdly, dsi_hss, dsi_hsw, dsi_hbp,
+ dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp);
+
+ log_debug("%s: dsi data start (ns) %u + %u + %u + %u = %u\n", __func__,
+ tc358768_dsi_bytes_to_ns(priv, dsi_vsdly),
+ tc358768_dsi_bytes_to_ns(priv, dsi_hss),
+ tc358768_dsi_bytes_to_ns(priv, dsi_hsw),
+ tc358768_dsi_bytes_to_ns(priv, dsi_hbp),
+ tc358768_dsi_bytes_to_ns(priv, dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp));
+
+ /* Convert back to hsbyteclk */
+ dsi_vsdly /= priv->dsi_lanes;
+
+ /*
+ * The docs say that there is an internal delay of 40 cycles.
+ * However, we get underflows if we follow that rule. If we
+ * instead ignore the internal delay, things work. So either
+ * the docs are wrong or the calculations are wrong.
+ *
+ * As a temporary fix, add the internal delay here, to counter
+ * the subtraction when writing the register.
+ */
+ dsi_vsdly += internal_dly;
+
+ /* Clamp to the register max */
+ if (dsi_vsdly - internal_dly > 0x3ff) {
+ log_warning("%s: VSDly too high, underflows likely\n", __func__);
+ dsi_vsdly = 0x3ff + internal_dly;
+ }
+
+ /* VSDly[9:0] */
+ tc358768_write(dev, TC358768_VSDLY, dsi_vsdly - internal_dly);
+
+ tc358768_write(dev, TC358768_DATAFMT, val);
+ tc358768_write(dev, TC358768_DSITX_DT, data_type);
+
+ /* Enable D-PHY (HiZ->LP11) */
+ tc358768_write(dev, TC358768_CLW_CNTRL, 0x0000);
+ /* Enable lanes */
+ for (i = 0; i < device->lanes; i++)
+ tc358768_write(dev, TC358768_D0W_CNTRL + i * 4, 0x0000);
+
+ /* Set up D-PHY CONTTX */
+ tc358768_write(dev, TC358768_CLW_DPHYCONTTX, 0x0203);
+ /* Adjust lanes */
+ for (i = 0; i < device->lanes; i++)
+ tc358768_write(dev, TC358768_D0W_DPHYCONTTX + i * 4, 0x0203);
+
+ /* DSI Timings */
+ hsbyteclk_ps = (u32)div_u64(PICO, hsbyteclk);
+ dsiclk_ps = (u32)div_u64(PICO, dsiclk);
+ ui_ps = dsiclk_ps / 2;
+ log_debug("%s: dsiclk: %u ps, ui %u ps, hsbyteclk %u ps\n",
+ __func__, dsiclk_ps, ui_ps, hsbyteclk_ps);
+
+ /* LP11 > 100us for D-PHY Rx Init */
+ val = tc358768_ns_to_cnt(100 * 1000, hsbyteclk_ps) - 1;
+ log_debug("%s: LINEINITCNT: 0x%x\n", __func__, val);
+ tc358768_write(dev, TC358768_LINEINITCNT, val);
+
+ /* LPTimeCnt > 50ns */
+ val = tc358768_ns_to_cnt(50, hsbyteclk_ps) - 1;
+ lptxcnt = val;
+ log_debug("%s: LPTXTIMECNT: 0x%x\n", __func__, val);
+ tc358768_write(dev, TC358768_LPTXTIMECNT, val);
+
+ /* 38ns < TCLK_PREPARE < 95ns */
+ val = tc358768_ns_to_cnt(65, hsbyteclk_ps) - 1;
+ log_debug("%s: TCLK_PREPARECNT: 0x%x\n", __func__, val);
+ /* TCLK_PREPARE + TCLK_ZERO > 300ns */
+ val2 = tc358768_ns_to_cnt(300 - tc358768_ps_to_ns(2 * ui_ps),
+ hsbyteclk_ps) - 2;
+ log_debug("%s: TCLK_ZEROCNT: 0x%x\n", __func__, val2);
+ val |= val2 << 8;
+ tc358768_write(dev, TC358768_TCLK_HEADERCNT, val);
+
+ /* TCLK_TRAIL > 60ns AND TEOT <= 105 ns + 12*UI */
+ raw_val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(2 * ui_ps),
+ hsbyteclk_ps) - 5;
+ val = clamp(raw_val, 0, 127);
+ log_debug("%s: TCLK_TRAILCNT: 0x%x\n", __func__, val);
+ tc358768_write(dev, TC358768_TCLK_TRAILCNT, val);
+
+ /* 40ns + 4*UI < THS_PREPARE < 85ns + 6*UI */
+ val = 50 + tc358768_ps_to_ns(4 * ui_ps);
+ val = tc358768_ns_to_cnt(val, hsbyteclk_ps) - 1;
+ log_debug("%s: THS_PREPARECNT: 0x%x\n", __func__, val);
+ /* THS_PREPARE + THS_ZERO > 145ns + 10*UI */
+ raw_val = tc358768_ns_to_cnt(145 - tc358768_ps_to_ns(3 * ui_ps),
+ hsbyteclk_ps) - 10;
+ val2 = clamp(raw_val, 0, 127);
+ log_debug("%s: THS_ZEROCNT: 0x%x\n", __func__, val2);
+ val |= val2 << 8;
+ tc358768_write(dev, TC358768_THS_HEADERCNT, val);
+
+ /* TWAKEUP > 1ms in lptxcnt steps */
+ val = tc358768_ns_to_cnt(1020000, hsbyteclk_ps);
+ val = val / (lptxcnt + 1) - 1;
+ log_debug("%s: TWAKEUP: 0x%x\n", __func__, val);
+ tc358768_write(dev, TC358768_TWAKEUP, val);
+
+ /* TCLK_POSTCNT > 60ns + 52*UI */
+ val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(52 * ui_ps),
+ hsbyteclk_ps) - 3;
+ log_debug("%s: TCLK_POSTCNT: 0x%x\n", __func__, val);
+ tc358768_write(dev, TC358768_TCLK_POSTCNT, val);
+
+ /* max(60ns + 4*UI, 8*UI) < THS_TRAILCNT < 105ns + 12*UI */
+ raw_val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(18 * ui_ps),
+ hsbyteclk_ps) - 4;
+ val = clamp(raw_val, 0, 15);
+ log_debug("%s: THS_TRAILCNT: 0x%x\n", __func__, val);
+ tc358768_write(dev, TC358768_THS_TRAILCNT, val);
+
+ val = BIT(0);
+ for (i = 0; i < device->lanes; i++)
+ val |= BIT(i + 1);
+ tc358768_write(dev, TC358768_HSTXVREGEN, val);
+
+ tc358768_write(dev, TC358768_TXOPTIONCNTRL,
+ (device->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) ? 0 : BIT(0));
+
+ /* TXTAGOCNT[26:16] RXTASURECNT[10:0] */
+ val = tc358768_ps_to_ns((lptxcnt + 1) * hsbyteclk_ps * 4);
+ val = tc358768_ns_to_cnt(val, hsbyteclk_ps) / 4 - 1;
+ log_debug("%s: TXTAGOCNT: 0x%x\n", __func__, val);
+ val2 = tc358768_ns_to_cnt(tc358768_ps_to_ns((lptxcnt + 1) * hsbyteclk_ps),
+ hsbyteclk_ps) - 2;
+ log_debug("%s: RXTASURECNT: 0x%x\n", __func__, val2);
+ val = val << 16 | val2;
+ tc358768_write(dev, TC358768_BTACNTRL1, val);
+
+ /* START[0] */
+ tc358768_write(dev, TC358768_STARTCNTRL, 1);
+
+ if (device->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
+ /* Set pulse mode */
+ tc358768_write(dev, TC358768_DSI_EVENT, 0);
+
+ /* vact */
+ tc358768_write(dev, TC358768_DSI_VACT, dt->vactive.typ);
+ /* vsw */
+ tc358768_write(dev, TC358768_DSI_VSW, dt->vsync_len.typ);
+ /* vbp */
+ tc358768_write(dev, TC358768_DSI_VBPR, dt->vback_porch.typ);
+ } else {
+ /* Set event mode */
+ tc358768_write(dev, TC358768_DSI_EVENT, 1);
+
+ /* vact */
+ tc358768_write(dev, TC358768_DSI_VACT, dt->vactive.typ);
+
+ /* vsw (+ vbp) */
+ tc358768_write(dev, TC358768_DSI_VSW,
+ dt->vsync_len.typ + dt->vback_porch.typ);
+ /* vbp (not used in event mode) */
+ tc358768_write(dev, TC358768_DSI_VBPR, 0);
+ }
+
+ /* hsw (bytes) */
+ tc358768_write(dev, TC358768_DSI_HSW, dsi_hsw);
+
+ /* hbp (bytes) */
+ tc358768_write(dev, TC358768_DSI_HBPR, dsi_hbp);
+
+ /* hact (bytes) */
+ tc358768_write(dev, TC358768_DSI_HACT, hact);
+
+ /* VSYNC polarity */
+ tc358768_update_bits(dev, TC358768_CONFCTL, BIT(5),
+ (dt->flags & DISPLAY_FLAGS_VSYNC_HIGH) ? BIT(5) : 0);
+
+ /* HSYNC polarity */
+ tc358768_update_bits(dev, TC358768_PP_MISC, BIT(0),
+ (dt->flags & DISPLAY_FLAGS_HSYNC_LOW) ? BIT(0) : 0);
+
+ /* Start DSI Tx */
+ tc358768_write(dev, TC358768_DSI_START, 0x1);
+
+ /* Configure DSI_Control register */
+ val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
+ val |= TC358768_DSI_CONTROL_TXMD | TC358768_DSI_CONTROL_HSCKMD |
+ 0x3 << 1 | TC358768_DSI_CONTROL_EOTDIS;
+ tc358768_write(dev, TC358768_DSI_CONFW, val);
+
+ val = TC358768_DSI_CONFW_MODE_SET | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
+ val |= (device->lanes - 1) << 1;
+
+ val |= TC358768_DSI_CONTROL_TXMD;
+
+ if (!(device->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
+ val |= TC358768_DSI_CONTROL_HSCKMD;
+
+ /*
+ * TODO: Actually MIPI_DSI_MODE_NO_EOT_PACKET
+ *
+ * Many of the DSI flags have names opposite to their
+ * actual effects, e.g. MIPI_DSI_MODE_EOT_PACKET means
+ * that EoT packets will actually be disabled.
+ */
+ if (device->mode_flags & MIPI_DSI_MODE_EOT_PACKET)
+ val |= TC358768_DSI_CONTROL_EOTDIS;
+
+ tc358768_write(dev, TC358768_DSI_CONFW, val);
+
+ val = TC358768_DSI_CONFW_MODE_CLR |
+ TC358768_DSI_CONFW_ADDR_DSI_CONTROL |
+ TC358768_DSI_CONTROL_DIS_MODE; /* DSI mode */
+ tc358768_write(dev, TC358768_DSI_CONFW, val);
+
+ /* clear FrmStop and RstPtr */
+ tc358768_update_bits(dev, TC358768_PP_MISC, 0x3 << 14, 0);
+
+ /* set PP_en */
+ tc358768_update_bits(dev, TC358768_CONFCTL, BIT(6), BIT(6));
+
+ /* Set up panel configuration */
+ return panel_enable_backlight(priv->panel);
+}
+
+static int tc358768_set_backlight(struct udevice *dev, int percent)
+{
+ struct tc358768_priv *priv = dev_get_priv(dev);
+
+ return panel_set_backlight(priv->panel, percent);
+}
+
+static int tc358768_panel_timings(struct udevice *dev,
+ struct display_timing *timing)
+{
+ struct tc358768_priv *priv = dev_get_priv(dev);
+
+ /* Default to positive sync */
+
+ if (!(priv->timing.flags &
+ (DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_HSYNC_HIGH)))
+ priv->timing.flags |= DISPLAY_FLAGS_HSYNC_HIGH;
+
+ if (!(priv->timing.flags &
+ (DISPLAY_FLAGS_VSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH)))
+ priv->timing.flags |= DISPLAY_FLAGS_VSYNC_HIGH;
+
+ memcpy(timing, &priv->timing, sizeof(*timing));
+
+ return 0;
+}
+
+static int tc358768_setup(struct udevice *dev)
+{
+ struct tc358768_priv *priv = dev_get_priv(dev);
+ struct mipi_dsi_device *device = &priv->device;
+ struct mipi_dsi_panel_plat *mipi_plat;
+ int ret;
+
+ /* The bridge uses 16 bit registers */
+ ret = i2c_set_chip_offset_len(dev, 2);
+ if (ret) {
+ log_debug("%s: set_chip_offset_len failed: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev,
+ "panel", &priv->panel);
+ if (ret) {
+ log_debug("%s: Cannot get panel: ret=%d\n", __func__, ret);
+ return log_ret(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 = &tc358768_dsi_host_ops;
+
+ device->host = &priv->host;
+ device->lanes = mipi_plat->lanes;
+ device->format = mipi_plat->format;
+ device->mode_flags = mipi_plat->mode_flags;
+
+ priv->pd_lines = mipi_dsi_pixel_format_to_bpp(device->format);
+ priv->dsi_lanes = device->lanes;
+
+ /* get regulators */
+ ret = device_get_supply_regulator(dev, "vddc-supply", &priv->vddc);
+ if (ret) {
+ log_debug("%s: vddc regulator error: %d\n", __func__, ret);
+ if (ret != -ENOENT)
+ return log_ret(ret);
+ }
+
+ ret = device_get_supply_regulator(dev, "vddmipi-supply", &priv->vddmipi);
+ if (ret) {
+ log_debug("%s: vddmipi regulator error: %d\n", __func__, ret);
+ if (ret != -ENOENT)
+ return log_ret(ret);
+ }
+
+ ret = device_get_supply_regulator(dev, "vddio-supply", &priv->vddio);
+ if (ret) {
+ log_debug("%s: vddio regulator error: %d\n", __func__, ret);
+ if (ret != -ENOENT)
+ return log_ret(ret);
+ }
+
+ /* get clk */
+ priv->refclk = devm_clk_get(dev, "refclk");
+ if (IS_ERR(priv->refclk)) {
+ log_debug("%s: Could not get refclk: %ld\n",
+ __func__, PTR_ERR(priv->refclk));
+ return PTR_ERR(priv->refclk);
+ }
+
+ /* get gpios */
+ ret = gpio_request_by_name(dev, "reset-gpios", 0,
+ &priv->reset_gpio, GPIOD_IS_OUT);
+ if (ret) {
+ log_debug("%s: Could not decode reset-gpios (%d)\n", __func__, ret);
+ return ret;
+ }
+
+ dm_gpio_set_value(&priv->reset_gpio, 1);
+
+ return 0;
+}
+
+static int tc358768_probe(struct udevice *dev)
+{
+ if (device_get_uclass_id(dev->parent) != UCLASS_I2C)
+ return -EPROTONOSUPPORT;
+
+ return tc358768_setup(dev);
+}
+
+struct panel_ops tc358768_ops = {
+ .enable_backlight = tc358768_attach,
+ .set_backlight = tc358768_set_backlight,
+ .get_display_timing = tc358768_panel_timings,
+};
+
+static const struct udevice_id tc358768_ids[] = {
+ { .compatible = "toshiba,tc358768" },
+ { .compatible = "toshiba,tc358778" },
+ { }
+};
+
+U_BOOT_DRIVER(tc358768) = {
+ .name = "tc358768",
+ .id = UCLASS_PANEL,
+ .of_match = tc358768_ids,
+ .ops = &tc358768_ops,
+ .probe = tc358768_probe,
+ .priv_auto = sizeof(struct tc358768_priv),
+};
projects / u-boot.git / commitdiff