diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/tc358768.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/tc358768.c | 1046 |
1 files changed, 1046 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c new file mode 100644 index 000000000000..1b39e8d37834 --- /dev/null +++ b/drivers/gpu/drm/bridge/tc358768.c @@ -0,0 +1,1046 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com + * Author: Peter Ujfalusi <[email protected]> + */ + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_drv.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_of.h> +#include <drm/drm_panel.h> +#include <video/mipi_display.h> +#include <video/videomode.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 (0x3 << 24) + +static const char * const tc358768_supplies[] = { + "vddc", "vddmipi", "vddio" +}; + +struct tc358768_dsi_output { + struct mipi_dsi_device *dev; + struct drm_panel *panel; + struct drm_bridge *bridge; +}; + +struct tc358768_priv { + struct device *dev; + struct regmap *regmap; + struct gpio_desc *reset_gpio; + struct regulator_bulk_data supplies[ARRAY_SIZE(tc358768_supplies)]; + struct clk *refclk; + int enabled; + int error; + + struct mipi_dsi_host dsi_host; + struct drm_bridge bridge; + struct tc358768_dsi_output output; + + 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 inline struct tc358768_priv *dsi_host_to_tc358768(struct mipi_dsi_host + *host) +{ + return container_of(host, struct tc358768_priv, dsi_host); +} + +static inline struct tc358768_priv *bridge_to_tc358768(struct drm_bridge + *bridge) +{ + return container_of(bridge, struct tc358768_priv, bridge); +} + +static int tc358768_clear_error(struct tc358768_priv *priv) +{ + int ret = priv->error; + + priv->error = 0; + return ret; +} + +static void tc358768_write(struct tc358768_priv *priv, u32 reg, u32 val) +{ + size_t count = 2; + + if (priv->error) + return; + + /* 16-bit register? */ + if (reg < 0x100 || reg >= 0x600) + count = 1; + + priv->error = regmap_bulk_write(priv->regmap, reg, &val, count); +} + +static void tc358768_read(struct tc358768_priv *priv, u32 reg, u32 *val) +{ + size_t count = 2; + + if (priv->error) + return; + + /* 16-bit register? */ + if (reg < 0x100 || reg >= 0x600) { + *val = 0; + count = 1; + } + + priv->error = regmap_bulk_read(priv->regmap, reg, val, count); +} + +static void tc358768_update_bits(struct tc358768_priv *priv, u32 reg, u32 mask, + u32 val) +{ + u32 tmp, orig; + + tc358768_read(priv, reg, &orig); + tmp = orig & ~mask; + tmp |= val & mask; + if (tmp != orig) + tc358768_write(priv, reg, tmp); +} + +static int tc358768_sw_reset(struct tc358768_priv *priv) +{ + /* Assert Reset */ + tc358768_write(priv, TC358768_SYSCTL, 1); + /* Release Reset, Exit Sleep */ + tc358768_write(priv, TC358768_SYSCTL, 0); + + return tc358768_clear_error(priv); +} + +static void tc358768_hw_enable(struct tc358768_priv *priv) +{ + int ret; + + if (priv->enabled) + return; + + ret = regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies); + if (ret < 0) + dev_err(priv->dev, "error enabling regulators (%d)\n", ret); + + if (priv->reset_gpio) + usleep_range(200, 300); + + /* + * The RESX is active low (GPIO_ACTIVE_LOW). + * DEASSERT (value = 0) the reset_gpio to enable the chip + */ + gpiod_set_value_cansleep(priv->reset_gpio, 0); + + /* wait for encoder clocks to stabilize */ + usleep_range(1000, 2000); + + priv->enabled = true; +} + +static void tc358768_hw_disable(struct tc358768_priv *priv) +{ + int ret; + + if (!priv->enabled) + return; + + /* + * The RESX is active low (GPIO_ACTIVE_LOW). + * ASSERT (value = 1) the reset_gpio to disable the chip + */ + gpiod_set_value_cansleep(priv->reset_gpio, 1); + + ret = regulator_bulk_disable(ARRAY_SIZE(priv->supplies), + priv->supplies); + if (ret < 0) + dev_err(priv->dev, "error disabling regulators (%d)\n", ret); + + priv->enabled = false; +} + +static u32 tc358768_pll_to_pclk(struct tc358768_priv *priv, u32 pll_clk) +{ + return (u32)div_u64((u64)pll_clk * priv->dsi_lanes, priv->pd_lines); +} + +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, + const struct drm_display_mode *mode, + bool verify_only) +{ + 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, mode->clock * 1000); + + /* pll_clk = RefClk * [(FBD + 1)/ (PRD + 1)] * [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 = 0; prd < 16; ++prd) { + u32 divisor = (prd + 1) * (1 << frs); + u32 fbd; + + for (fbd = 0; fbd < 512; ++fbd) { + u32 pll, diff; + + pll = (u32)div_u64((u64)refclk * (fbd + 1), divisor); + + if (pll >= max_pll || pll < min_pll) + 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) { + dev_err(priv->dev, "could not find suitable PLL setup\n"); + return -EINVAL; + } + +found: + if (verify_only) + return 0; + + priv->fbd = best_fbd; + priv->prd = best_prd; + priv->frs = frs; + priv->dsiclk = best_pll / 2; + + return 0; +} + +static int tc358768_dsi_host_attach(struct mipi_dsi_host *host, + struct mipi_dsi_device *dev) +{ + struct tc358768_priv *priv = dsi_host_to_tc358768(host); + struct drm_bridge *bridge; + struct drm_panel *panel; + struct device_node *ep; + int ret; + + if (dev->lanes > 4) { + dev_err(priv->dev, "unsupported number of data lanes(%u)\n", + dev->lanes); + return -EINVAL; + } + + /* + * tc358768 supports both Video and Pulse mode, but the driver only + * implements Video (event) mode currently + */ + if (!(dev->mode_flags & MIPI_DSI_MODE_VIDEO)) { + dev_err(priv->dev, "Only MIPI_DSI_MODE_VIDEO is supported\n"); + return -ENOTSUPP; + } + + /* + * tc358768 supports RGB888, RGB666, RGB666_PACKED and RGB565, but only + * RGB888 is verified. + */ + if (dev->format != MIPI_DSI_FMT_RGB888) { + dev_warn(priv->dev, "Only MIPI_DSI_FMT_RGB888 tested!\n"); + return -ENOTSUPP; + } + + ret = drm_of_find_panel_or_bridge(host->dev->of_node, 1, 0, &panel, + &bridge); + if (ret) + return ret; + + if (panel) { + bridge = drm_panel_bridge_add_typed(panel, + DRM_MODE_CONNECTOR_DSI); + if (IS_ERR(bridge)) + return PTR_ERR(bridge); + } + + priv->output.dev = dev; + priv->output.bridge = bridge; + priv->output.panel = panel; + + priv->dsi_lanes = dev->lanes; + + /* get input ep (port0/endpoint0) */ + ret = -EINVAL; + ep = of_graph_get_endpoint_by_regs(host->dev->of_node, 0, 0); + if (ep) { + ret = of_property_read_u32(ep, "data-lines", &priv->pd_lines); + + of_node_put(ep); + } + + if (ret) + priv->pd_lines = mipi_dsi_pixel_format_to_bpp(dev->format); + + drm_bridge_add(&priv->bridge); + + return 0; +} + +static int tc358768_dsi_host_detach(struct mipi_dsi_host *host, + struct mipi_dsi_device *dev) +{ + struct tc358768_priv *priv = dsi_host_to_tc358768(host); + + drm_bridge_remove(&priv->bridge); + if (priv->output.panel) + drm_panel_bridge_remove(priv->output.bridge); + + return 0; +} + +static ssize_t tc358768_dsi_host_transfer(struct mipi_dsi_host *host, + const struct mipi_dsi_msg *msg) +{ + struct tc358768_priv *priv = dsi_host_to_tc358768(host); + struct mipi_dsi_packet packet; + int ret; + + if (!priv->enabled) { + dev_err(priv->dev, "Bridge is not enabled\n"); + return -ENODEV; + } + + if (msg->rx_len) { + dev_warn(priv->dev, "MIPI rx is not supported\n"); + return -ENOTSUPP; + } + + if (msg->tx_len > 8) { + dev_warn(priv->dev, "Maximum 8 byte MIPI tx is supported\n"); + return -ENOTSUPP; + } + + ret = mipi_dsi_create_packet(&packet, msg); + if (ret) + return ret; + + if (mipi_dsi_packet_format_is_short(msg->type)) { + tc358768_write(priv, TC358768_DSICMD_TYPE, + (0x10 << 8) | (packet.header[0] & 0x3f)); + tc358768_write(priv, TC358768_DSICMD_WC, 0); + tc358768_write(priv, TC358768_DSICMD_WD0, + (packet.header[2] << 8) | packet.header[1]); + } else { + int i; + + tc358768_write(priv, TC358768_DSICMD_TYPE, + (0x40 << 8) | (packet.header[0] & 0x3f)); + tc358768_write(priv, 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(priv, TC358768_DSICMD_WD0 + i, val); + } + } + + /* start transfer */ + tc358768_write(priv, TC358768_DSICMD_TX, 1); + + ret = tc358768_clear_error(priv); + if (ret) + dev_warn(priv->dev, "Software disable failed: %d\n", ret); + else + ret = packet.size; + + return ret; +} + +static const struct mipi_dsi_host_ops tc358768_dsi_host_ops = { + .attach = tc358768_dsi_host_attach, + .detach = tc358768_dsi_host_detach, + .transfer = tc358768_dsi_host_transfer, +}; + +static int tc358768_bridge_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct tc358768_priv *priv = bridge_to_tc358768(bridge); + + if (!drm_core_check_feature(bridge->dev, DRIVER_ATOMIC)) { + dev_err(priv->dev, "needs atomic updates support\n"); + return -ENOTSUPP; + } + + return drm_bridge_attach(bridge->encoder, priv->output.bridge, bridge, + flags); +} + +static enum drm_mode_status +tc358768_bridge_mode_valid(struct drm_bridge *bridge, + const struct drm_display_mode *mode) +{ + struct tc358768_priv *priv = bridge_to_tc358768(bridge); + + if (tc358768_calc_pll(priv, mode, true)) + return MODE_CLOCK_RANGE; + + return MODE_OK; +} + +static void tc358768_bridge_disable(struct drm_bridge *bridge) +{ + struct tc358768_priv *priv = bridge_to_tc358768(bridge); + int ret; + + /* set FrmStop */ + tc358768_update_bits(priv, TC358768_PP_MISC, BIT(15), BIT(15)); + + /* wait at least for one frame */ + msleep(50); + + /* clear PP_en */ + tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), 0); + + /* set RstPtr */ + tc358768_update_bits(priv, TC358768_PP_MISC, BIT(14), BIT(14)); + + ret = tc358768_clear_error(priv); + if (ret) + dev_warn(priv->dev, "Software disable failed: %d\n", ret); +} + +static void tc358768_bridge_post_disable(struct drm_bridge *bridge) +{ + struct tc358768_priv *priv = bridge_to_tc358768(bridge); + + tc358768_hw_disable(priv); +} + +static int tc358768_setup_pll(struct tc358768_priv *priv, + const struct drm_display_mode *mode) +{ + u32 fbd, prd, frs; + int ret; + + ret = tc358768_calc_pll(priv, mode, false); + if (ret) { + dev_err(priv->dev, "PLL calculation failed: %d\n", ret); + return ret; + } + + fbd = priv->fbd; + prd = priv->prd; + frs = priv->frs; + + dev_dbg(priv->dev, "PLL: refclk %lu, fbd %u, prd %u, frs %u\n", + clk_get_rate(priv->refclk), fbd, prd, frs); + dev_dbg(priv->dev, "PLL: pll_clk: %u, DSIClk %u, DSIByteClk %u\n", + priv->dsiclk * 2, priv->dsiclk, priv->dsiclk / 4); + dev_dbg(priv->dev, "PLL: pclk %u (panel: %u)\n", + tc358768_pll_to_pclk(priv, priv->dsiclk * 2), + mode->clock * 1000); + + /* PRD[15:12] FBD[8:0] */ + tc358768_write(priv, TC358768_PLLCTL0, (prd << 12) | fbd); + + /* FRS[11:10] LBWS[9:8] CKEN[4] RESETB[1] EN[0] */ + tc358768_write(priv, TC358768_PLLCTL1, + (frs << 10) | (0x2 << 8) | BIT(1) | BIT(0)); + + /* wait for lock */ + usleep_range(1000, 2000); + + /* FRS[11:10] LBWS[9:8] CKEN[4] PLL_CKEN[4] RESETB[1] EN[0] */ + tc358768_write(priv, TC358768_PLLCTL1, + (frs << 10) | (0x2 << 8) | BIT(4) | BIT(1) | BIT(0)); + + return tc358768_clear_error(priv); +} + +#define TC358768_PRECISION 1000 +static u32 tc358768_ns_to_cnt(u32 ns, u32 period_nsk) +{ + return (ns * TC358768_PRECISION + period_nsk) / period_nsk; +} + +static u32 tc358768_to_ns(u32 nsk) +{ + return (nsk / TC358768_PRECISION); +} + +static void tc358768_bridge_pre_enable(struct drm_bridge *bridge) +{ + struct tc358768_priv *priv = bridge_to_tc358768(bridge); + struct mipi_dsi_device *dsi_dev = priv->output.dev; + u32 val, val2, lptxcnt, hact, data_type; + const struct drm_display_mode *mode; + u32 dsibclk_nsk, dsiclk_nsk, ui_nsk, phy_delay_nsk; + u32 dsiclk, dsibclk; + int ret, i; + + tc358768_hw_enable(priv); + + ret = tc358768_sw_reset(priv); + if (ret) { + dev_err(priv->dev, "Software reset failed: %d\n", ret); + tc358768_hw_disable(priv); + return; + } + + mode = &bridge->encoder->crtc->state->adjusted_mode; + ret = tc358768_setup_pll(priv, mode); + if (ret) { + dev_err(priv->dev, "PLL setup failed: %d\n", ret); + tc358768_hw_disable(priv); + return; + } + + dsiclk = priv->dsiclk; + dsibclk = dsiclk / 4; + + /* Data Format Control Register */ + val = BIT(2) | BIT(1) | BIT(0); /* rdswap_en | dsitx_en | txdt_en */ + switch (dsi_dev->format) { + case MIPI_DSI_FMT_RGB888: + val |= (0x3 << 4); + hact = mode->hdisplay * 3; + data_type = MIPI_DSI_PACKED_PIXEL_STREAM_24; + break; + case MIPI_DSI_FMT_RGB666: + val |= (0x4 << 4); + hact = mode->hdisplay * 3; + data_type = MIPI_DSI_PACKED_PIXEL_STREAM_18; + break; + + case MIPI_DSI_FMT_RGB666_PACKED: + val |= (0x4 << 4) | BIT(3); + hact = mode->hdisplay * 18 / 8; + data_type = MIPI_DSI_PIXEL_STREAM_3BYTE_18; + break; + + case MIPI_DSI_FMT_RGB565: + val |= (0x5 << 4); + hact = mode->hdisplay * 2; + data_type = MIPI_DSI_PACKED_PIXEL_STREAM_16; + break; + default: + dev_err(priv->dev, "Invalid data format (%u)\n", + dsi_dev->format); + tc358768_hw_disable(priv); + return; + } + + /* VSDly[9:0] */ + tc358768_write(priv, TC358768_VSDLY, 1); + + tc358768_write(priv, TC358768_DATAFMT, val); + tc358768_write(priv, TC358768_DSITX_DT, data_type); + + /* Enable D-PHY (HiZ->LP11) */ + tc358768_write(priv, TC358768_CLW_CNTRL, 0x0000); + /* Enable lanes */ + for (i = 0; i < dsi_dev->lanes; i++) + tc358768_write(priv, TC358768_D0W_CNTRL + i * 4, 0x0000); + + /* DSI Timings */ + dsibclk_nsk = (u32)div_u64((u64)1000000000 * TC358768_PRECISION, + dsibclk); + dsiclk_nsk = (u32)div_u64((u64)1000000000 * TC358768_PRECISION, dsiclk); + ui_nsk = dsiclk_nsk / 2; + phy_delay_nsk = dsibclk_nsk + 2 * dsiclk_nsk; + dev_dbg(priv->dev, "dsiclk_nsk: %u\n", dsiclk_nsk); + dev_dbg(priv->dev, "ui_nsk: %u\n", ui_nsk); + dev_dbg(priv->dev, "dsibclk_nsk: %u\n", dsibclk_nsk); + dev_dbg(priv->dev, "phy_delay_nsk: %u\n", phy_delay_nsk); + + /* LP11 > 100us for D-PHY Rx Init */ + val = tc358768_ns_to_cnt(100 * 1000, dsibclk_nsk) - 1; + dev_dbg(priv->dev, "LINEINITCNT: 0x%x\n", val); + tc358768_write(priv, TC358768_LINEINITCNT, val); + + /* LPTimeCnt > 50ns */ + val = tc358768_ns_to_cnt(50, dsibclk_nsk) - 1; + lptxcnt = val; + dev_dbg(priv->dev, "LPTXTIMECNT: 0x%x\n", val); + tc358768_write(priv, TC358768_LPTXTIMECNT, val); + + /* 38ns < TCLK_PREPARE < 95ns */ + val = tc358768_ns_to_cnt(65, dsibclk_nsk) - 1; + /* TCLK_PREPARE > 300ns */ + val2 = tc358768_ns_to_cnt(300 + tc358768_to_ns(3 * ui_nsk), + dsibclk_nsk); + val |= (val2 - tc358768_to_ns(phy_delay_nsk - dsibclk_nsk)) << 8; + dev_dbg(priv->dev, "TCLK_HEADERCNT: 0x%x\n", val); + tc358768_write(priv, TC358768_TCLK_HEADERCNT, val); + + /* TCLK_TRAIL > 60ns + 3*UI */ + val = 60 + tc358768_to_ns(3 * ui_nsk); + val = tc358768_ns_to_cnt(val, dsibclk_nsk) - 5; + dev_dbg(priv->dev, "TCLK_TRAILCNT: 0x%x\n", val); + tc358768_write(priv, TC358768_TCLK_TRAILCNT, val); + + /* 40ns + 4*UI < THS_PREPARE < 85ns + 6*UI */ + val = 50 + tc358768_to_ns(4 * ui_nsk); + val = tc358768_ns_to_cnt(val, dsibclk_nsk) - 1; + /* THS_ZERO > 145ns + 10*UI */ + val2 = tc358768_ns_to_cnt(145 - tc358768_to_ns(ui_nsk), dsibclk_nsk); + val |= (val2 - tc358768_to_ns(phy_delay_nsk)) << 8; + dev_dbg(priv->dev, "THS_HEADERCNT: 0x%x\n", val); + tc358768_write(priv, TC358768_THS_HEADERCNT, val); + + /* TWAKEUP > 1ms in lptxcnt steps */ + val = tc358768_ns_to_cnt(1020000, dsibclk_nsk); + val = val / (lptxcnt + 1) - 1; + dev_dbg(priv->dev, "TWAKEUP: 0x%x\n", val); + tc358768_write(priv, TC358768_TWAKEUP, val); + + /* TCLK_POSTCNT > 60ns + 52*UI */ + val = tc358768_ns_to_cnt(60 + tc358768_to_ns(52 * ui_nsk), + dsibclk_nsk) - 3; + dev_dbg(priv->dev, "TCLK_POSTCNT: 0x%x\n", val); + tc358768_write(priv, TC358768_TCLK_POSTCNT, val); + + /* 60ns + 4*UI < THS_PREPARE < 105ns + 12*UI */ + val = tc358768_ns_to_cnt(60 + tc358768_to_ns(15 * ui_nsk), + dsibclk_nsk) - 5; + dev_dbg(priv->dev, "THS_TRAILCNT: 0x%x\n", val); + tc358768_write(priv, TC358768_THS_TRAILCNT, val); + + val = BIT(0); + for (i = 0; i < dsi_dev->lanes; i++) + val |= BIT(i + 1); + tc358768_write(priv, TC358768_HSTXVREGEN, val); + + if (!(dsi_dev->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)) + tc358768_write(priv, TC358768_TXOPTIONCNTRL, 0x1); + + /* TXTAGOCNT[26:16] RXTASURECNT[10:0] */ + val = tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk * 4); + val = tc358768_ns_to_cnt(val, dsibclk_nsk) - 1; + val2 = tc358768_ns_to_cnt(tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk), + dsibclk_nsk) - 2; + val |= val2 << 16; + dev_dbg(priv->dev, "BTACNTRL1: 0x%x\n", val); + tc358768_write(priv, TC358768_BTACNTRL1, val); + + /* START[0] */ + tc358768_write(priv, TC358768_STARTCNTRL, 1); + + /* Set event mode */ + tc358768_write(priv, TC358768_DSI_EVENT, 1); + + /* vsw (+ vbp) */ + tc358768_write(priv, TC358768_DSI_VSW, + mode->vtotal - mode->vsync_start); + /* vbp (not used in event mode) */ + tc358768_write(priv, TC358768_DSI_VBPR, 0); + /* vact */ + tc358768_write(priv, TC358768_DSI_VACT, mode->vdisplay); + + /* (hsw + hbp) * byteclk * ndl / pclk */ + val = (u32)div_u64((mode->htotal - mode->hsync_start) * + ((u64)priv->dsiclk / 4) * priv->dsi_lanes, + mode->clock * 1000); + tc358768_write(priv, TC358768_DSI_HSW, val); + /* hbp (not used in event mode) */ + tc358768_write(priv, TC358768_DSI_HBPR, 0); + /* hact (bytes) */ + tc358768_write(priv, TC358768_DSI_HACT, hact); + + /* VSYNC polarity */ + if (!(mode->flags & DRM_MODE_FLAG_NVSYNC)) + tc358768_update_bits(priv, TC358768_CONFCTL, BIT(5), BIT(5)); + /* HSYNC polarity */ + if (mode->flags & DRM_MODE_FLAG_PHSYNC) + tc358768_update_bits(priv, TC358768_PP_MISC, BIT(0), BIT(0)); + + /* Start DSI Tx */ + tc358768_write(priv, 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(priv, TC358768_DSI_CONFW, val); + + val = TC358768_DSI_CONFW_MODE_SET | TC358768_DSI_CONFW_ADDR_DSI_CONTROL; + val |= (dsi_dev->lanes - 1) << 1; + + if (!(dsi_dev->mode_flags & MIPI_DSI_MODE_LPM)) + val |= TC358768_DSI_CONTROL_TXMD; + + if (!(dsi_dev->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)) + val |= TC358768_DSI_CONTROL_HSCKMD; + + if (dsi_dev->mode_flags & MIPI_DSI_MODE_EOT_PACKET) + val |= TC358768_DSI_CONTROL_EOTDIS; + + tc358768_write(priv, TC358768_DSI_CONFW, val); + + val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL; + val |= TC358768_DSI_CONTROL_DIS_MODE; /* DSI mode */ + tc358768_write(priv, TC358768_DSI_CONFW, val); + + ret = tc358768_clear_error(priv); + if (ret) { + dev_err(priv->dev, "Bridge pre_enable failed: %d\n", ret); + tc358768_bridge_disable(bridge); + tc358768_bridge_post_disable(bridge); + } +} + +static void tc358768_bridge_enable(struct drm_bridge *bridge) +{ + struct tc358768_priv *priv = bridge_to_tc358768(bridge); + int ret; + + if (!priv->enabled) { + dev_err(priv->dev, "Bridge is not enabled\n"); + return; + } + + /* clear FrmStop and RstPtr */ + tc358768_update_bits(priv, TC358768_PP_MISC, 0x3 << 14, 0); + + /* set PP_en */ + tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), BIT(6)); + + ret = tc358768_clear_error(priv); + if (ret) { + dev_err(priv->dev, "Bridge enable failed: %d\n", ret); + tc358768_bridge_disable(bridge); + tc358768_bridge_post_disable(bridge); + } +} + +static const struct drm_bridge_funcs tc358768_bridge_funcs = { + .attach = tc358768_bridge_attach, + .mode_valid = tc358768_bridge_mode_valid, + .pre_enable = tc358768_bridge_pre_enable, + .enable = tc358768_bridge_enable, + .disable = tc358768_bridge_disable, + .post_disable = tc358768_bridge_post_disable, +}; + +static const struct drm_bridge_timings default_tc358768_timings = { + .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE + | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE + | DRM_BUS_FLAG_DE_HIGH, +}; + +static bool tc358768_is_reserved_reg(unsigned int reg) +{ + switch (reg) { + case 0x114 ... 0x13f: + case 0x200: + case 0x20c: + case 0x400 ... 0x408: + case 0x41c ... 0x42f: + return true; + default: + return false; + } +} + +static bool tc358768_writeable_reg(struct device *dev, unsigned int reg) +{ + if (tc358768_is_reserved_reg(reg)) + return false; + + switch (reg) { + case TC358768_CHIPID: + case TC358768_FIFOSTATUS: + case TC358768_DSITXSTATUS ... (TC358768_DSITXSTATUS + 2): + case TC358768_DSI_CONTROL ... (TC358768_DSI_INT_ENA + 2): + case TC358768_DSICMD_RDFIFO ... (TC358768_DSI_ERR_HALT + 2): + return false; + default: + return true; + } +} + +static bool tc358768_readable_reg(struct device *dev, unsigned int reg) +{ + if (tc358768_is_reserved_reg(reg)) + return false; + + switch (reg) { + case TC358768_STARTCNTRL: + case TC358768_DSI_CONFW ... (TC358768_DSI_CONFW + 2): + case TC358768_DSI_INT_CLR ... (TC358768_DSI_INT_CLR + 2): + case TC358768_DSI_START ... (TC358768_DSI_START + 2): + case TC358768_DBG_DATA: + return false; + default: + return true; + } +} + +static const struct regmap_config tc358768_regmap_config = { + .name = "tc358768", + .reg_bits = 16, + .val_bits = 16, + .max_register = TC358768_DSI_HACT, + .cache_type = REGCACHE_NONE, + .writeable_reg = tc358768_writeable_reg, + .readable_reg = tc358768_readable_reg, + .reg_format_endian = REGMAP_ENDIAN_BIG, + .val_format_endian = REGMAP_ENDIAN_BIG, +}; + +static const struct i2c_device_id tc358768_i2c_ids[] = { + { "tc358768", 0 }, + { "tc358778", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, tc358768_i2c_ids); + +static const struct of_device_id tc358768_of_ids[] = { + { .compatible = "toshiba,tc358768", }, + { .compatible = "toshiba,tc358778", }, + { } +}; +MODULE_DEVICE_TABLE(of, tc358768_of_ids); + +static int tc358768_get_regulators(struct tc358768_priv *priv) +{ + int i, ret; + + for (i = 0; i < ARRAY_SIZE(priv->supplies); ++i) + priv->supplies[i].supply = tc358768_supplies[i]; + + ret = devm_regulator_bulk_get(priv->dev, ARRAY_SIZE(priv->supplies), + priv->supplies); + if (ret < 0) + dev_err(priv->dev, "failed to get regulators: %d\n", ret); + + return ret; +} + +static int tc358768_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct tc358768_priv *priv; + struct device *dev = &client->dev; + struct device_node *np = dev->of_node; + int ret; + + if (!np) + return -ENODEV; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + dev_set_drvdata(dev, priv); + priv->dev = dev; + + ret = tc358768_get_regulators(priv); + if (ret) + return ret; + + priv->refclk = devm_clk_get(dev, "refclk"); + if (IS_ERR(priv->refclk)) + return PTR_ERR(priv->refclk); + + /* + * RESX is low active, to disable tc358768 initially (keep in reset) + * the gpio line must be LOW. This is the ASSERTED state of + * GPIO_ACTIVE_LOW (GPIOD_OUT_HIGH == ASSERTED). + */ + priv->reset_gpio = devm_gpiod_get_optional(dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(priv->reset_gpio)) + return PTR_ERR(priv->reset_gpio); + + priv->regmap = devm_regmap_init_i2c(client, &tc358768_regmap_config); + if (IS_ERR(priv->regmap)) { + dev_err(dev, "Failed to init regmap\n"); + return PTR_ERR(priv->regmap); + } + + priv->dsi_host.dev = dev; + priv->dsi_host.ops = &tc358768_dsi_host_ops; + + priv->bridge.funcs = &tc358768_bridge_funcs; + priv->bridge.timings = &default_tc358768_timings; + priv->bridge.of_node = np; + + i2c_set_clientdata(client, priv); + + return mipi_dsi_host_register(&priv->dsi_host); +} + +static int tc358768_i2c_remove(struct i2c_client *client) +{ + struct tc358768_priv *priv = i2c_get_clientdata(client); + + mipi_dsi_host_unregister(&priv->dsi_host); + + return 0; +} + +static struct i2c_driver tc358768_driver = { + .driver = { + .name = "tc358768", + .of_match_table = tc358768_of_ids, + }, + .id_table = tc358768_i2c_ids, + .probe = tc358768_i2c_probe, + .remove = tc358768_i2c_remove, +}; +module_i2c_driver(tc358768_driver); + +MODULE_AUTHOR("Peter Ujfalusi <[email protected]>"); +MODULE_DESCRIPTION("TC358768AXBG/TC358778XBG DSI bridge"); +MODULE_LICENSE("GPL v2"); |