Hi Andrzej, On 16/01/2020 16.35, Andrzej Hajda wrote: > On 17.12.2019 11:15, Peter Ujfalusi wrote: >> Add basic support for the Toshiba TC358768 RGB to DSI bridge. >> Not all the features of the TC358768 is implemented by the initial driver: >> MIPI_DSI_MODE_VIDEO and MIPI_DSI_FMT_RGB888 is only supported and tested. >> >> Only write is implemented for mipi_dsi_host_ops.transfer. >> >> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx> >> --- >> drivers/gpu/drm/bridge/Kconfig | 10 + >> drivers/gpu/drm/bridge/Makefile | 1 + >> drivers/gpu/drm/bridge/tc358768.c | 963 ++++++++++++++++++++++++++++++ >> 3 files changed, 974 insertions(+) >> create mode 100644 drivers/gpu/drm/bridge/tc358768.c >> >> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig >> index ccc698c44f58..fd65666702e1 100644 >> --- a/drivers/gpu/drm/bridge/Kconfig >> +++ b/drivers/gpu/drm/bridge/Kconfig >> @@ -122,6 +122,16 @@ config DRM_TOSHIBA_TC358767 >> ---help--- >> Toshiba TC358767 eDP bridge chip driver. >> >> +config DRM_TOSHIBA_TC358768 >> + tristate "Toshiba TC358768 MIPI DSI bridge" >> + depends on OF >> + select DRM_KMS_HELPER >> + select REGMAP_I2C >> + select DRM_PANEL >> + select DRM_MIPI_DSI >> + help >> + Toshiba TC358768AXBG/TC358778XBG DSI bridge chip driver. >> + >> config DRM_TI_TFP410 >> tristate "TI TFP410 DVI/HDMI bridge" >> depends on OF >> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile >> index a6c7dd7727ea..204696e30572 100644 >> --- a/drivers/gpu/drm/bridge/Makefile >> +++ b/drivers/gpu/drm/bridge/Makefile >> @@ -11,6 +11,7 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o >> obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o >> obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o >> obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o >> +obj-$(CONFIG_DRM_TOSHIBA_TC358768) += tc358768.o >> obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/ >> obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o >> obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o >> diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c >> new file mode 100644 >> index 000000000000..63571191b1c4 >> --- /dev/null >> +++ b/drivers/gpu/drm/bridge/tc358768.c >> @@ -0,0 +1,963 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +/* >> + * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com > > > Just FYI, we have 2020 already, maybe update needed. Oh, how time flies ;) > > >> + * Author: Peter Ujfalusi <peter.ujfalusi@xxxxxx> >> + */ >> + >> +#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/slab.h> >> +#include <linux/regulator/consumer.h> > > > alphabetic order Ok. >> + >> +#include <drm/drm_atomic_helper.h> >> +#include <drm/drm_crtc_helper.h> >> +#include <drm/drm_drv.h> >> +#include <drm/drm_of.h> >> +#include <drm/drm_panel.h> >> +#include <drm/drm_mipi_dsi.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 >> + >> +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; >> + >> + struct mipi_dsi_host dsi_host; >> + struct drm_bridge bridge; >> + struct tc358768_dsi_output output; > > > Since tc358768_dsi_output is used only here, you can define it here as > well, up to you. I think I have done it like this to avoid thinking about prefixes for what is under the tc358768_dsi_output. I'll take a look if it will look better unpacked here. >> + >> + const struct drm_display_mode *mode; >> + u32 pd_lines; /* number of Parallel Port Input Data Lines */ >> + u32 dsi_lanes; /* number of DSI Lanes */ >> + >> + u32 fbd; >> + u32 prd; >> + u32 frs; > > > Looks ugly, please rename these 3 vars to sth more readable, or at least > document them (if the names comes from the specification). Sure, I agree. > >> + >> + 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_write(struct tc358768_priv *priv, u32 reg, u32 val) >> +{ >> + size_t count = 2; >> + >> + /* 16-bit register? */ >> + if (reg < 0x100 || reg >= 0x600) >> + count = 1; >> + >> + return regmap_bulk_write(priv->regmap, reg, &val, count); >> +} >> + >> +static int tc358768_read(struct tc358768_priv *priv, u32 reg, u32 *val) >> +{ >> + size_t count = 2; >> + >> + /* 16-bit register? */ >> + if (reg < 0x100 || reg >= 0x600) { >> + *val = 0; >> + count = 1; >> + } >> + >> + return regmap_bulk_read(priv->regmap, reg, val, count); >> +} >> + >> +static int tc358768_update_bits(struct tc358768_priv *priv, u32 reg, u32 mask, >> + u32 val) >> +{ >> + int ret; >> + u32 tmp, orig; >> + >> + ret = tc358768_read(priv, reg, &orig); >> + if (ret != 0) >> + return ret; >> + >> + tmp = orig & ~mask; >> + tmp |= val & mask; >> + >> + if (tmp != orig) >> + ret = tc358768_write(priv, reg, tmp); >> + >> + return ret; >> +} > > > You have defined 3 hw access functions which can fail but you do not > check their return values in later usage. Does regmap/i2c logs sth in > case of error? > > If not, maybe error logging should be added at least in these accessors. > > The best would be to propagate errors to callers, either traditional way > (add check after each call), either you can use 'error state' pattern, > which I recommend (see for example to 'ctx->error' usage in sil-sii8620.c). OK, I'll clean this up >> + >> +static void 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); >> +} >> + >> +static void tc358768_hw_enable(struct tc358768_priv *priv, bool enable) >> +{ >> + int ret; >> + >> + if (enable) { >> + ret = regulator_bulk_enable(ARRAY_SIZE(priv->supplies), >> + priv->supplies); >> + if (ret < 0) >> + dev_err(priv->dev, "error enabling regulators (%d)\n", >> + ret); >> + usleep_range(200, 300); >> + } >> + >> + /* >> + * The RESX is active low (GPIO_ACTIVE_LOW). >> + * Invert the 'enable' value to get correct assertion for the gpio: >> + * enable == true: reset_gpio needs to be DEASSERTED (value = 0) >> + * enable == false: reset_gpio needs to be ASSERTED (value = 1) >> + */ >> + gpiod_set_value_cansleep(priv->reset_gpio, !enable); >> + >> + regcache_cache_only(priv->regmap, !enable); >> + if (enable) { >> + /* wait for encoder clocks to stabilize */ >> + usleep_range(1000, 2000); >> + >> + regcache_sync(priv->regmap); > > > What do you need to sync here? Right, we do a full reconfiguration after this, you are correct, there is no need to sync and the regmap's REGCACHE_RBTREE can be REGCACHE_NONE safely. > >> + } else { >> + ret = regulator_bulk_disable(ARRAY_SIZE(priv->supplies), >> + priv->supplies); >> + if (ret < 0) >> + dev_err(priv->dev, "error disabling regulators (%d)\n", >> + ret); >> + } >> +} > > > Above function looks ugly - these 'if (enable)' and similar are hard to > read, maybe two separate hw_enable, hw_disable function would look > better, more readable, up to you. OK, I'll separate the enable and disable. > >> + >> +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 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, priv->mode->clock * 1000); >> + >> + /* pll_clk = RefClk * [(FBD + 1)/ (PRD + 1)] * [1 / (2^FRS)] */ >> + > I guess below code: >> + frs = UINT_MAX; >> + >> + for (i = 0; i < ARRAY_SIZE(frs_limits) - 1; i++) { >> + if (target_pll < frs_limits[i] && >> + target_pll >= frs_limits[i + 1]) { >> + frs = i; >> + max_pll = frs_limits[i]; >> + min_pll = frs_limits[i + 1]; >> + break; >> + } >> + } >> + >> + if (frs == UINT_MAX) >> + return -EINVAL; > > > can be simplified: > > 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]; Yes, it enhances readability as well. > >> + >> + 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) >> + break; >> + } >> + >> + if (best_diff == 0) >> + break; > why another check here? To break out from the top for() loop also in case exact match has been found. >> + } >> + >> + if (best_diff == UINT_MAX) { >> + dev_err(priv->dev, "could not find suitable PLL setup\n"); >> + return -EINVAL; >> + } >> + >> + 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 (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; >> + >> + tc358768_hw_enable(priv, true); >> + >> + 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, j; >> + >> + 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 = 0; >> + >> + for (j = 0; j < 2 && i + j < packet.payload_length; j++) >> + val |= packet.payload[i + j] << (8 * j); >> + > > > Quite clever, but barely readable, maybe: > > u16 val = packet.payload[i]; > > if (i + 1 < packet.payload_length) > > val |= packet.payload[i + 1] << 8; yes, looks simpler. > > >> + tc358768_write(priv, TC358768_DSICMD_WD0 + i, val); >> + } >> + } >> + >> + /* start transfer */ >> + tc358768_write(priv, TC358768_DSICMD_TX, 1); >> + >> + tc358768_hw_enable(priv, false); >> + >> + return 0; >> +} >> + >> +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) >> +{ >> + 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); >> +} >> + >> +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); >> + >> + priv->mode = mode; > > > This is dangerous, you should assume mode pointer provided in this > callback is valid only till end of function. > > If you need mode later you can use this ugly pointer: > > priv->bridge.encoder->crtc->state->adjusted_mode > > or alternatively copy mode to priv (also ugly, but at least no dangling > pointers). OK, I'll see how it can be reworked. > > > >> + >> + if (tc358768_calc_pll(priv)) >> + return MODE_CLOCK_RANGE; > > tc358768_calc_pll modifies state, mode_valid callback shouldn't do it. > > > Regards > > Andrzej Thank you for the review, - Péter >> + >> + return MODE_OK; >> +} >> + >> +static void tc358768_bridge_disable(struct drm_bridge *bridge) >> +{ >> + struct tc358768_priv *priv = bridge_to_tc358768(bridge); >> + >> + /* 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)); >> + >> + tc358768_hw_enable(priv, false); >> +} >> + >> +static void tc358768_setup_pll(struct tc358768_priv *priv) >> +{ >> + u32 fbd, prd, frs; >> + >> + 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), >> + priv->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)); >> +} >> + >> +#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_enable(struct drm_bridge *bridge) >> +{ >> + struct tc358768_priv *priv = bridge_to_tc358768(bridge); >> + const struct drm_display_mode *mode = priv->mode; >> + struct mipi_dsi_device *dsi_dev = priv->output.dev; >> + u32 val, val2, lptxcnt, hact, data_type; >> + u32 dsiclk = priv->dsiclk; >> + u32 dsibclk = dsiclk / 4; >> + u32 dsibclk_nsk, dsiclk_nsk, ui_nsk, phy_delay_nsk; >> + int i; >> + >> + tc358768_hw_enable(priv, true); >> + >> + tc358768_sw_reset(priv); >> + >> + tc358768_setup_pll(priv); >> + >> + /* VSDly[9:0] */ >> + tc358768_write(priv, TC358768_VSDLY, 1); >> + >> + /* 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); >> + return; >> + } >> + >> + 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 = (6 << 29) | (0x3 << 24); /* CLEAR, DSI_Control */ >> + val |= BIT(7) | BIT(5) | 0x3 << 1 | BIT(0); >> + tc358768_write(priv, TC358768_DSI_CONFW, val); >> + >> + val = (5 << 29) | (0x3 << 24); /* SET, DSI_Control */ >> + if (!(dsi_dev->mode_flags & MIPI_DSI_MODE_LPM)) >> + val |= BIT(7); >> + if (!(dsi_dev->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)) >> + val |= BIT(5); >> + val |= (dsi_dev->lanes - 1) << 1; >> + if (dsi_dev->mode_flags & MIPI_DSI_MODE_EOT_PACKET) >> + val |= BIT(0); >> + tc358768_write(priv, TC358768_DSI_CONFW, val); >> + >> + val = (6 << 29) | (0x3 << 24); /* CLEAR, DSI_Control */ >> + val |= 0x8000; /* DSI mode */ >> + tc358768_write(priv, TC358768_DSI_CONFW, val); >> + >> + /* 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)); >> +} >> + >> +static const struct drm_bridge_funcs tc358768_bridge_funcs = { >> + .attach = tc358768_bridge_attach, >> + .mode_valid = tc358768_bridge_mode_valid, >> + .disable = tc358768_bridge_disable, >> + .enable = tc358768_bridge_enable, >> +}; >> + >> +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 bool tc358768_volatile_reg(struct device *dev, unsigned int reg) >> +{ >> + switch (reg) { >> + case TC358768_FIFOSTATUS: >> + case TC358768_STARTCNTRL ... (TC358768_DSITXSTATUS + 2): >> + case TC358768_DSI_CONTROL ... (TC358768_DSI_INT_ENA + 2): >> + case TC358768_DSICMD_RDFIFO ... (TC358768_DSI_ERR_HALT + 2): >> + case TC358768_DSICMD_TX: >> + return true; >> + default: >> + return false; >> + } >> +} >> + >> +static const struct regmap_config tc358768_regmap_config = { >> + .name = "tc358768", >> + .reg_bits = 16, >> + .val_bits = 16, >> + .max_register = TC358768_DSI_HACT, >> + .cache_type = REGCACHE_RBTREE, >> + .writeable_reg = tc358768_writeable_reg, >> + .readable_reg = tc358768_readable_reg, >> + .volatile_reg = tc358768_volatile_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); >> + } >> + >> + if (priv->reset_gpio) >> + regcache_cache_only(priv->regmap, true); >> + >> + 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); >> + >> + ret = mipi_dsi_host_register(&priv->dsi_host); >> + if (ret) >> + return ret; >> + >> + return 0; >> +} >> + >> +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 <peter.ujfalusi@xxxxxx>"); >> +MODULE_DESCRIPTION("TC358768AXBG/TC358778XBG DSI bridge"); >> +MODULE_LICENSE("GPL v2"); > > Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
