Add a Synopsys Designware MIPI DSI host bridge driver, based on the Rockchip version from rockchip/dw-mipi-dsi.c with phy & bridge APIs.
Signed-off-by: yannick fertre yannick.fertre@st.com --- drivers/video/Kconfig | 9 + drivers/video/Makefile | 1 + drivers/video/dw_mipi_dsi.c | 822 ++++++++++++++++++++++++++++++++++++++++++++ include/dw_mipi_dsi.h | 34 ++ 4 files changed, 866 insertions(+) create mode 100644 drivers/video/dw_mipi_dsi.c create mode 100644 include/dw_mipi_dsi.h
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index b5fc535..0f641d7 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -657,6 +657,15 @@ config VIDEO_DW_HDMI rather requires a SoC-specific glue driver to call it), it can not be enabled from the configuration menu.
+config VIDEO_DW_MIPI_DSI + bool + help + Enables the common driver code for the Designware MIPI DSI + block found in SoCs from various vendors. + As this does not provide any functionality by itself (but + rather requires a SoC-specific glue driver to call it), it + can not be enabled from the configuration menu. + config VIDEO_SIMPLE bool "Simple display driver for preconfigured display" help diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 65002af..50be569 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -53,6 +53,7 @@ obj-$(CONFIG_FORMIKE) += formike.o obj-$(CONFIG_LG4573) += lg4573.o obj-$(CONFIG_AM335X_LCD) += am335x-fb.o obj-$(CONFIG_VIDEO_DW_HDMI) += dw_hdmi.o +obj-$(CONFIG_VIDEO_DW_MIPI_DSI) += dw_mipi_dsi.o obj-${CONFIG_VIDEO_MIPI_DSI} += mipi_display.o obj-$(CONFIG_VIDEO_SIMPLE) += simplefb.o obj-${CONFIG_VIDEO_TEGRA124} += tegra124/ diff --git a/drivers/video/dw_mipi_dsi.c b/drivers/video/dw_mipi_dsi.c new file mode 100644 index 0000000..d7bd92d --- /dev/null +++ b/drivers/video/dw_mipi_dsi.c @@ -0,0 +1,822 @@ +/* + * Copyright (C) 2016, Fuzhou Rockchip Electronics Co., Ltd + * Copyright (C) 2018, STMicroelectronics - All Rights Reserved + * Author(s): Philippe Cornu philippe.cornu@st.com for STMicroelectronics. + * Yannick Fertre yannick.fertre@st.com for STMicroelectronics. + * + * Modified by Yannick Fertre yannick.fertre@st.com + * This generic Synopsys DesignWare MIPI DSI host driver is based on the + * bridge synopsys from drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c (kernel + * linux). + */ + +#include <common.h> +#include <clk.h> +#include <dm.h> +#include <errno.h> +#include <mipi_display.h> +#include <panel.h> +#include <video.h> +#include <asm/io.h> +#include <asm/arch/gpio.h> +#include <dm/device-internal.h> +#include <dw_mipi_dsi.h> +#include <linux/iopoll.h> +#include <video_bridge.h> + +#define HWVER_131 0x31333100 /* IP version 1.31 */ + +#define DSI_VERSION 0x00 +#define VERSION GENMASK(31, 8) + +#define DSI_PWR_UP 0x04 +#define RESET 0 +#define POWERUP BIT(0) + +#define DSI_CLKMGR_CFG 0x08 +#define TO_CLK_DIVISION(div) (((div) & 0xff) << 8) +#define TX_ESC_CLK_DIVISION(div) ((div) & 0xff) + +#define DSI_DPI_VCID 0x0c +#define DPI_VCID(vcid) ((vcid) & 0x3) + +#define DSI_DPI_COLOR_CODING 0x10 +#define LOOSELY18_EN BIT(8) +#define DPI_COLOR_CODING_16BIT_1 0x0 +#define DPI_COLOR_CODING_16BIT_2 0x1 +#define DPI_COLOR_CODING_16BIT_3 0x2 +#define DPI_COLOR_CODING_18BIT_1 0x3 +#define DPI_COLOR_CODING_18BIT_2 0x4 +#define DPI_COLOR_CODING_24BIT 0x5 + +#define DSI_DPI_CFG_POL 0x14 +#define COLORM_ACTIVE_LOW BIT(4) +#define SHUTD_ACTIVE_LOW BIT(3) +#define HSYNC_ACTIVE_LOW BIT(2) +#define VSYNC_ACTIVE_LOW BIT(1) +#define DATAEN_ACTIVE_LOW BIT(0) + +#define DSI_DPI_LP_CMD_TIM 0x18 +#define OUTVACT_LPCMD_TIME(p) (((p) & 0xff) << 16) +#define INVACT_LPCMD_TIME(p) ((p) & 0xff) + +#define DSI_DBI_VCID 0x1c +#define DSI_DBI_CFG 0x20 +#define DSI_DBI_PARTITIONING_EN 0x24 +#define DSI_DBI_CMDSIZE 0x28 + +#define DSI_PCKHDL_CFG 0x2c +#define CRC_RX_EN BIT(4) +#define ECC_RX_EN BIT(3) +#define BTA_EN BIT(2) +#define EOTP_RX_EN BIT(1) +#define EOTP_TX_EN BIT(0) + +#define DSI_GEN_VCID 0x30 + +#define DSI_MODE_CFG 0x34 +#define ENABLE_VIDEO_MODE 0 +#define ENABLE_CMD_MODE BIT(0) + +#define DSI_VID_MODE_CFG 0x38 +#define ENABLE_LOW_POWER (0x3f << 8) +#define ENABLE_LOW_POWER_MASK (0x3f << 8) +#define VID_MODE_TYPE_NON_BURST_SYNC_PULSES 0x0 +#define VID_MODE_TYPE_NON_BURST_SYNC_EVENTS 0x1 +#define VID_MODE_TYPE_BURST 0x2 +#define VID_MODE_TYPE_MASK 0x3 + +#define DSI_VID_PKT_SIZE 0x3c +#define VID_PKT_SIZE(p) ((p) & 0x3fff) + +#define DSI_VID_NUM_CHUNKS 0x40 +#define VID_NUM_CHUNKS(c) ((c) & 0x1fff) + +#define DSI_VID_NULL_SIZE 0x44 +#define VID_NULL_SIZE(b) ((b) & 0x1fff) + +#define DSI_VID_HSA_TIME 0x48 +#define DSI_VID_HBP_TIME 0x4c +#define DSI_VID_HLINE_TIME 0x50 +#define DSI_VID_VSA_LINES 0x54 +#define DSI_VID_VBP_LINES 0x58 +#define DSI_VID_VFP_LINES 0x5c +#define DSI_VID_VACTIVE_LINES 0x60 +#define DSI_EDPI_CMD_SIZE 0x64 + +#define DSI_CMD_MODE_CFG 0x68 +#define MAX_RD_PKT_SIZE_LP BIT(24) +#define DCS_LW_TX_LP BIT(19) +#define DCS_SR_0P_TX_LP BIT(18) +#define DCS_SW_1P_TX_LP BIT(17) +#define DCS_SW_0P_TX_LP BIT(16) +#define GEN_LW_TX_LP BIT(14) +#define GEN_SR_2P_TX_LP BIT(13) +#define GEN_SR_1P_TX_LP BIT(12) +#define GEN_SR_0P_TX_LP BIT(11) +#define GEN_SW_2P_TX_LP BIT(10) +#define GEN_SW_1P_TX_LP BIT(9) +#define GEN_SW_0P_TX_LP BIT(8) +#define ACK_RQST_EN BIT(1) +#define TEAR_FX_EN BIT(0) + +#define CMD_MODE_ALL_LP (MAX_RD_PKT_SIZE_LP | \ + DCS_LW_TX_LP | \ + DCS_SR_0P_TX_LP | \ + DCS_SW_1P_TX_LP | \ + DCS_SW_0P_TX_LP | \ + GEN_LW_TX_LP | \ + GEN_SR_2P_TX_LP | \ + GEN_SR_1P_TX_LP | \ + GEN_SR_0P_TX_LP | \ + GEN_SW_2P_TX_LP | \ + GEN_SW_1P_TX_LP | \ + GEN_SW_0P_TX_LP) + +#define DSI_GEN_HDR 0x6c +#define DSI_GEN_PLD_DATA 0x70 + +#define DSI_CMD_PKT_STATUS 0x74 +#define GEN_RD_CMD_BUSY BIT(6) +#define GEN_PLD_R_FULL BIT(5) +#define GEN_PLD_R_EMPTY BIT(4) +#define GEN_PLD_W_FULL BIT(3) +#define GEN_PLD_W_EMPTY BIT(2) +#define GEN_CMD_FULL BIT(1) +#define GEN_CMD_EMPTY BIT(0) + +#define DSI_TO_CNT_CFG 0x78 +#define HSTX_TO_CNT(p) (((p) & 0xffff) << 16) +#define LPRX_TO_CNT(p) ((p) & 0xffff) + +#define DSI_HS_RD_TO_CNT 0x7c +#define DSI_LP_RD_TO_CNT 0x80 +#define DSI_HS_WR_TO_CNT 0x84 +#define DSI_LP_WR_TO_CNT 0x88 +#define DSI_BTA_TO_CNT 0x8c + +#define DSI_LPCLK_CTRL 0x94 +#define AUTO_CLKLANE_CTRL BIT(1) +#define PHY_TXREQUESTCLKHS BIT(0) + +#define DSI_PHY_TMR_LPCLK_CFG 0x98 +#define PHY_CLKHS2LP_TIME(lbcc) (((lbcc) & 0x3ff) << 16) +#define PHY_CLKLP2HS_TIME(lbcc) ((lbcc) & 0x3ff) + +#define DSI_PHY_TMR_CFG 0x9c +#define PHY_HS2LP_TIME(lbcc) (((lbcc) & 0xff) << 24) +#define PHY_LP2HS_TIME(lbcc) (((lbcc) & 0xff) << 16) +#define MAX_RD_TIME(lbcc) ((lbcc) & 0x7fff) +#define PHY_HS2LP_TIME_V131(lbcc) (((lbcc) & 0x3ff) << 16) +#define PHY_LP2HS_TIME_V131(lbcc) ((lbcc) & 0x3ff) + +#define DSI_PHY_RSTZ 0xa0 +#define PHY_DISFORCEPLL 0 +#define PHY_ENFORCEPLL BIT(3) +#define PHY_DISABLECLK 0 +#define PHY_ENABLECLK BIT(2) +#define PHY_RSTZ 0 +#define PHY_UNRSTZ BIT(1) +#define PHY_SHUTDOWNZ 0 +#define PHY_UNSHUTDOWNZ BIT(0) + +#define DSI_PHY_IF_CFG 0xa4 +#define PHY_STOP_WAIT_TIME(cycle) (((cycle) & 0xff) << 8) +#define N_LANES(n) (((n) - 1) & 0x3) + +#define DSI_PHY_ULPS_CTRL 0xa8 +#define DSI_PHY_TX_TRIGGERS 0xac + +#define DSI_PHY_STATUS 0xb0 +#define PHY_STOP_STATE_CLK_LANE BIT(2) +#define PHY_LOCK BIT(0) + +#define DSI_PHY_TST_CTRL0 0xb4 +#define PHY_TESTCLK BIT(1) +#define PHY_UNTESTCLK 0 +#define PHY_TESTCLR BIT(0) +#define PHY_UNTESTCLR 0 + +#define DSI_PHY_TST_CTRL1 0xb8 +#define PHY_TESTEN BIT(16) +#define PHY_UNTESTEN 0 +#define PHY_TESTDOUT(n) (((n) & 0xff) << 8) +#define PHY_TESTDIN(n) ((n) & 0xff) + +#define DSI_INT_ST0 0xbc +#define DSI_INT_ST1 0xc0 +#define DSI_INT_MSK0 0xc4 +#define DSI_INT_MSK1 0xc8 + +#define DSI_PHY_TMR_RD_CFG 0xf4 +#define MAX_RD_TIME_V131(lbcc) ((lbcc) & 0x7fff) + +#define PHY_STATUS_TIMEOUT_US 10000 +#define CMD_PKT_STATUS_TIMEOUT_US 20000 + +#define MSEC_PER_SEC 1000 + +struct dw_mipi_dsi { + struct mipi_dsi_host dsi_host; + struct mipi_dsi_device *device; + void __iomem *base; + unsigned int lane_mbps; /* per lane */ + u32 channel; + u32 lanes; + u32 format; + unsigned long mode_flags; + unsigned int max_data_lanes; + const struct dw_mipi_dsi_phy_ops *phy_ops; +}; + +static int dsi_mode_vrefresh(struct display_timing *timings) +{ + int refresh = 0; + unsigned int calc_val; + u32 htotal = timings->hactive.typ + timings->hfront_porch.typ + + timings->hback_porch.typ + timings->hsync_len.typ; + u32 vtotal = timings->vactive.typ + timings->vfront_porch.typ + + timings->vback_porch.typ + timings->vsync_len.typ; + + if (htotal > 0 && vtotal > 0) { + calc_val = timings->pixelclock.typ; + calc_val /= htotal; + refresh = (calc_val + vtotal / 2) / vtotal; + } + + return refresh; +} + +/* + * The controller should generate 2 frames before + * preparing the peripheral. + */ +static void dw_mipi_dsi_wait_for_two_frames(struct display_timing *timings) +{ + int refresh, two_frames; + + refresh = dsi_mode_vrefresh(timings); + two_frames = DIV_ROUND_UP(MSEC_PER_SEC, refresh) * 2; + mdelay(two_frames); +} + +static inline struct dw_mipi_dsi *host_to_dsi(struct mipi_dsi_host *host) +{ + return container_of(host, struct dw_mipi_dsi, dsi_host); +} + +static inline void dsi_write(struct dw_mipi_dsi *dsi, u32 reg, u32 val) +{ + writel(val, dsi->base + reg); +} + +static inline u32 dsi_read(struct dw_mipi_dsi *dsi, u32 reg) +{ + return readl(dsi->base + reg); +} + +static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host, + struct mipi_dsi_device *device) +{ + struct dw_mipi_dsi *dsi = host_to_dsi(host); + + if (device->lanes > dsi->max_data_lanes) { + pr_err("the number of data lanes(%u) is too many\n", + device->lanes); + return -EINVAL; + } + + dsi->lanes = device->lanes; + dsi->channel = device->channel; + dsi->format = device->format; + dsi->mode_flags = device->mode_flags; + + return 0; +} + +static void dw_mipi_message_config(struct dw_mipi_dsi *dsi, + const struct mipi_dsi_msg *msg) +{ + bool lpm = msg->flags & MIPI_DSI_MSG_USE_LPM; + u32 val = 0; + + if (msg->flags & MIPI_DSI_MSG_REQ_ACK) + val |= ACK_RQST_EN; + if (lpm) + val |= CMD_MODE_ALL_LP; + + dsi_write(dsi, DSI_LPCLK_CTRL, lpm ? 0 : PHY_TXREQUESTCLKHS); + dsi_write(dsi, DSI_CMD_MODE_CFG, val); +} + +static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val) +{ + int ret; + u32 val, mask; + + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS, + val, !(val & GEN_CMD_FULL), + CMD_PKT_STATUS_TIMEOUT_US); + if (ret < 0) { + pr_err("failed to get available command FIFO\n"); + return ret; + } + + dsi_write(dsi, DSI_GEN_HDR, hdr_val); + + mask = GEN_CMD_EMPTY | GEN_PLD_W_EMPTY; + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS, + val, (val & mask) == mask, + CMD_PKT_STATUS_TIMEOUT_US); + if (ret < 0) { + pr_err("failed to write command FIFO\n"); + return ret; + } + + return 0; +} + +static int dw_mipi_dsi_write(struct dw_mipi_dsi *dsi, + const struct mipi_dsi_packet *packet) +{ + const u8 *tx_buf = packet->payload; + int len = packet->payload_length, pld_data_bytes = sizeof(u32), ret; + __le32 word; + u32 val; + + while (len) { + if (len < pld_data_bytes) { + word = 0; + memcpy(&word, tx_buf, len); + dsi_write(dsi, DSI_GEN_PLD_DATA, le32_to_cpu(word)); + len = 0; + } else { + memcpy(&word, tx_buf, pld_data_bytes); + dsi_write(dsi, DSI_GEN_PLD_DATA, le32_to_cpu(word)); + tx_buf += pld_data_bytes; + len -= pld_data_bytes; + } + + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS, + val, !(val & GEN_PLD_W_FULL), + CMD_PKT_STATUS_TIMEOUT_US); + if (ret < 0) { + dev_err(dsi->dev, + "failed to get available write payload FIFO\n"); + return ret; + } + } + + word = 0; + memcpy(&word, packet->header, sizeof(packet->header)); + return dw_mipi_dsi_gen_pkt_hdr_write(dsi, le32_to_cpu(word)); +} + +static int dw_mipi_dsi_read(struct dw_mipi_dsi *dsi, + const struct mipi_dsi_msg *msg) +{ + int i, j, ret, len = msg->rx_len; + u8 *buf = msg->rx_buf; + u32 val; + + /* Wait end of the read operation */ + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS, + val, !(val & GEN_RD_CMD_BUSY), + CMD_PKT_STATUS_TIMEOUT_US); + if (ret) { + dev_err(dsi->dev, "Timeout during read operation\n"); + return ret; + } + + for (i = 0; i < len; i += 4) { + /* Read fifo must not be empty before all bytes are read */ + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS, + val, !(val & GEN_PLD_R_EMPTY), + CMD_PKT_STATUS_TIMEOUT_US); + if (ret) { + dev_err(dsi->dev, "Read payload FIFO is empty\n"); + return ret; + } + + val = dsi_read(dsi, DSI_GEN_PLD_DATA); + for (j = 0; j < 4 && j + i < len; j++) + buf[i + j] = val >> (8 * j); + } + + return ret; +} + +static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host, + const struct mipi_dsi_msg *msg) +{ + struct dw_mipi_dsi *dsi = host_to_dsi(host); + struct mipi_dsi_packet packet; + int ret, nb_bytes; + + ret = mipi_dsi_create_packet(&packet, msg); + if (ret) { + dev_err(dsi->dev, "failed to create packet: %d\n", ret); + return ret; + } + + dw_mipi_message_config(dsi, msg); + + ret = dw_mipi_dsi_write(dsi, &packet); + if (ret) + return ret; + + if (msg->rx_buf && msg->rx_len) { + ret = dw_mipi_dsi_read(dsi, msg); + if (ret) + return ret; + nb_bytes = msg->rx_len; + } else { + nb_bytes = packet.size; + } + + return nb_bytes; +} + +static const struct mipi_dsi_host_ops dw_mipi_dsi_host_ops = { + .attach = dw_mipi_dsi_host_attach, + .transfer = dw_mipi_dsi_host_transfer, +}; + +static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi) +{ + u32 val; + + /* + * TODO dw drv improvements + * enabling low power is panel-dependent, we should use the + * panel configuration here... + */ + val = ENABLE_LOW_POWER; + + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) + val |= VID_MODE_TYPE_BURST; + else if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) + val |= VID_MODE_TYPE_NON_BURST_SYNC_PULSES; + else + val |= VID_MODE_TYPE_NON_BURST_SYNC_EVENTS; + + dsi_write(dsi, DSI_VID_MODE_CFG, val); +} + +static void dw_mipi_dsi_set_mode(struct dw_mipi_dsi *dsi, + unsigned long mode_flags) +{ + dsi_write(dsi, DSI_PWR_UP, RESET); + + if (mode_flags & MIPI_DSI_MODE_VIDEO) { + dsi_write(dsi, DSI_MODE_CFG, ENABLE_VIDEO_MODE); + dw_mipi_dsi_video_mode_config(dsi); + dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS); + } else { + dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE); + } + + dsi_write(dsi, DSI_PWR_UP, POWERUP); +} + +static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi) +{ + /* + * The maximum permitted escape clock is 20MHz and it is derived from + * lanebyteclk, which is running at "lane_mbps / 8". Thus we want: + * + * (lane_mbps >> 3) / esc_clk_division < 20 + * which is: + * (lane_mbps >> 3) / 20 > esc_clk_division + */ + u32 esc_clk_division = (dsi->lane_mbps >> 3) / 20 + 1; + + dsi_write(dsi, DSI_PWR_UP, RESET); + + /* + * TODO dw drv improvements + * timeout clock division should be computed with the + * high speed transmission counter timeout and byte lane... + */ + dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVISION(10) | + TX_ESC_CLK_DIVISION(esc_clk_division)); +} + +static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi, + struct display_timing *timings) +{ + u32 val = 0, color = 0; + + switch (dsi->format) { + case MIPI_DSI_FMT_RGB888: + color = DPI_COLOR_CODING_24BIT; + break; + case MIPI_DSI_FMT_RGB666: + color = DPI_COLOR_CODING_18BIT_2 | LOOSELY18_EN; + break; + case MIPI_DSI_FMT_RGB666_PACKED: + color = DPI_COLOR_CODING_18BIT_1; + break; + case MIPI_DSI_FMT_RGB565: + color = DPI_COLOR_CODING_16BIT_1; + break; + } + + if (dsi->mode_flags & DISPLAY_FLAGS_VSYNC_HIGH) + val |= VSYNC_ACTIVE_LOW; + if (dsi->mode_flags & DISPLAY_FLAGS_HSYNC_HIGH) + val |= HSYNC_ACTIVE_LOW; + + dsi_write(dsi, DSI_DPI_VCID, DPI_VCID(dsi->channel)); + dsi_write(dsi, DSI_DPI_COLOR_CODING, color); + dsi_write(dsi, DSI_DPI_CFG_POL, val); + /* + * TODO dw drv improvements + * largest packet sizes during hfp or during vsa/vpb/vfp + * should be computed according to byte lane, lane number and only + * if sending lp cmds in high speed is enable (PHY_TXREQUESTCLKHS) + */ + dsi_write(dsi, DSI_DPI_LP_CMD_TIM, OUTVACT_LPCMD_TIME(4) + | INVACT_LPCMD_TIME(4)); +} + +static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi) +{ + dsi_write(dsi, DSI_PCKHDL_CFG, CRC_RX_EN | ECC_RX_EN | BTA_EN); +} + +static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi, + struct display_timing *timings) +{ + /* + * TODO dw drv improvements + * only burst mode is supported here. For non-burst video modes, + * we should compute DSI_VID_PKT_SIZE, DSI_VCCR.NUMC & + * DSI_VNPCR.NPSIZE... especially because this driver supports + * non-burst video modes, see dw_mipi_dsi_video_mode_config()... + */ + dsi_write(dsi, DSI_VID_PKT_SIZE, VID_PKT_SIZE(timings->hactive.typ)); +} + +static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi) +{ + /* + * TODO dw drv improvements + * compute high speed transmission counter timeout according + * to the timeout clock division (TO_CLK_DIVISION) and byte lane... + */ + dsi_write(dsi, DSI_TO_CNT_CFG, HSTX_TO_CNT(1000) | LPRX_TO_CNT(1000)); + /* + * TODO dw drv improvements + * the Bus-Turn-Around Timeout Counter should be computed + * according to byte lane... + */ + dsi_write(dsi, DSI_BTA_TO_CNT, 0xd00); + dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE); +} + +/* Get lane byte clock cycles. */ +static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi, + struct display_timing *timings, + u32 hcomponent) +{ + u32 frac, lbcc; + + lbcc = hcomponent * dsi->lane_mbps * MSEC_PER_SEC / 8; + + frac = lbcc % (timings->pixelclock.typ / 1000); + lbcc = lbcc / (timings->pixelclock.typ / 1000); + if (frac) + lbcc++; + + return lbcc; +} + +static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi, + struct display_timing *timings) +{ + u32 htotal, hsa, hbp, lbcc; + + htotal = timings->hactive.typ + timings->hfront_porch.typ + + timings->hback_porch.typ + timings->hsync_len.typ; + + hsa = timings->hback_porch.typ; + hbp = timings->hsync_len.typ; + + /* + * TODO dw drv improvements + * computations below may be improved... + */ + lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, timings, htotal); + dsi_write(dsi, DSI_VID_HLINE_TIME, lbcc); + + lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, timings, hsa); + dsi_write(dsi, DSI_VID_HSA_TIME, lbcc); + + lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, timings, hbp); + dsi_write(dsi, DSI_VID_HBP_TIME, lbcc); +} + +static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi, + struct display_timing *timings) +{ + u32 vactive, vsa, vfp, vbp; + + vactive = timings->vactive.typ; + vsa = timings->vback_porch.typ; + vfp = timings->vfront_porch.typ; + vbp = timings->vsync_len.typ; + + dsi_write(dsi, DSI_VID_VACTIVE_LINES, vactive); + dsi_write(dsi, DSI_VID_VSA_LINES, vsa); + dsi_write(dsi, DSI_VID_VFP_LINES, vfp); + dsi_write(dsi, DSI_VID_VBP_LINES, vbp); +} + +static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi) +{ + u32 hw_version; + + /* + * TODO dw drv improvements + * data & clock lane timers should be computed according to panel + * blankings and to the automatic clock lane control mode... + * note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with + * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP) + */ + + hw_version = dsi_read(dsi, DSI_VERSION) & VERSION; + + if (hw_version >= HWVER_131) { + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) | + PHY_LP2HS_TIME_V131(0x40)); + dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000)); + } else { + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40) | + PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000)); + } + + dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40) + | PHY_CLKLP2HS_TIME(0x40)); +} + +static void dw_mipi_dsi_dphy_interface_config(struct dw_mipi_dsi *dsi) +{ + /* + * TODO dw drv improvements + * stop wait time should be the maximum between host dsi + * and panel stop wait times + */ + dsi_write(dsi, DSI_PHY_IF_CFG, PHY_STOP_WAIT_TIME(0x20) | + N_LANES(dsi->lanes)); +} + +static void dw_mipi_dsi_dphy_init(struct dw_mipi_dsi *dsi) +{ + /* Clear PHY state */ + dsi_write(dsi, DSI_PHY_RSTZ, PHY_DISFORCEPLL | PHY_DISABLECLK + | PHY_RSTZ | PHY_SHUTDOWNZ); + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR); + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLR); + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR); +} + +static void dw_mipi_dsi_dphy_enable(struct dw_mipi_dsi *dsi) +{ + u32 val; + int ret; + + dsi_write(dsi, DSI_PHY_RSTZ, PHY_ENFORCEPLL | PHY_ENABLECLK | + PHY_UNRSTZ | PHY_UNSHUTDOWNZ); + + ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS, val, + val & PHY_LOCK, PHY_STATUS_TIMEOUT_US); + if (ret < 0) + pr_err("failed to wait phy lock state\n"); + + ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS, + val, val & PHY_STOP_STATE_CLK_LANE, + PHY_STATUS_TIMEOUT_US); + if (ret < 0) + pr_err("failed to wait phy clk lane stop state\n"); +} + +static void dw_mipi_dsi_clear_err(struct dw_mipi_dsi *dsi) +{ + dsi_read(dsi, DSI_INT_ST0); + dsi_read(dsi, DSI_INT_ST1); + dsi_write(dsi, DSI_INT_MSK0, 0); + dsi_write(dsi, DSI_INT_MSK1, 0); +} + +static void dw_mipi_dsi_bridge_set(struct dw_mipi_dsi *dsi, + struct display_timing *timings) +{ + const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->phy_ops; + int ret; + + ret = phy_ops->get_lane_mbps(dsi->device, timings, dsi->lanes, + dsi->format, &dsi->lane_mbps); + if (ret) + pr_err("Phy get_lane_mbps() failed\n"); + + dw_mipi_dsi_init(dsi); + dw_mipi_dsi_dpi_config(dsi, timings); + dw_mipi_dsi_packet_handler_config(dsi); + dw_mipi_dsi_video_mode_config(dsi); + dw_mipi_dsi_video_packet_config(dsi, timings); + dw_mipi_dsi_command_mode_config(dsi); + dw_mipi_dsi_line_timer_config(dsi, timings); + dw_mipi_dsi_vertical_timing_config(dsi, timings); + + dw_mipi_dsi_dphy_init(dsi); + dw_mipi_dsi_dphy_timing_config(dsi); + dw_mipi_dsi_dphy_interface_config(dsi); + + dw_mipi_dsi_clear_err(dsi); + + ret = phy_ops->init(dsi->device); + if (ret) + pr_err("Phy init() failed\n"); + + dw_mipi_dsi_dphy_enable(dsi); + + dw_mipi_dsi_wait_for_two_frames(timings); + + /* Switch to cmd mode for panel-bridge pre_enable & panel prepare */ + dw_mipi_dsi_set_mode(dsi, 0); +} + +void dw_mipi_dsi_bridge_enable(struct mipi_dsi_device *device) +{ + struct mipi_dsi_host *host = device->host; + struct dw_mipi_dsi *dsi = host_to_dsi(host); + + /* Switch to video mode for panel-bridge enable & panel enable */ + dw_mipi_dsi_set_mode(dsi, MIPI_DSI_MODE_VIDEO); +} +EXPORT_SYMBOL_GPL(dw_mipi_dsi_bridge_enable); + +int dw_mipi_dsi_init_bridge(struct mipi_dsi_device *device) +{ + struct dw_mipi_dsi_plat_data *platdata = dev_get_platdata(device->dev); + struct display_timing timings; + struct dw_mipi_dsi *dsi; + struct clk clk; + int ret; + + dsi = kzalloc(sizeof(*dsi), GFP_KERNEL); + + dsi->phy_ops = platdata->phy_ops; + dsi->max_data_lanes = platdata->max_data_lanes; + dsi->device = device; + dsi->dsi_host.ops = &dw_mipi_dsi_host_ops; + device->host = &dsi->dsi_host; + + /* TODO Get these settings from panel */ + dsi->lanes = 2; + dsi->format = MIPI_DSI_FMT_RGB888; + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | + MIPI_DSI_MODE_VIDEO_BURST | + MIPI_DSI_MODE_LPM; + + dsi->base = (void *)dev_read_addr(device->dev); + if ((fdt_addr_t)dsi->base == FDT_ADDR_T_NONE) { + pr_err("%s: dsi dt register address error\n", __func__); + return -EINVAL; + } + + ret = fdtdec_decode_display_timing(gd->fdt_blob, + dev_of_offset(platdata->panel), + 0, &timings); + if (ret) { + pr_err("%s: decode display timing error %d\n", __func__, ret); + return ret; + } + + if (!dsi->phy_ops->init || !dsi->phy_ops->get_lane_mbps) { + pr_err("Phy not properly configured\n"); + return -ENODEV; + } + + ret = clk_get_by_name(device->dev, "px_clk", &clk); + if (ret) { + pr_err("%s: peripheral clock get error %d\n", __func__, ret); + return ret; + } + + /* get the pixel clock set by the clock framework */ + timings.pixelclock.typ = clk_get_rate(&clk); + + dw_mipi_dsi_bridge_set(dsi, &timings); + + return 0; +} +EXPORT_SYMBOL_GPL(dw_mipi_dsi_init_bridge); + +MODULE_AUTHOR("Chris Zhong zyw@rock-chips.com"); +MODULE_AUTHOR("Philippe Cornu philippe.cornu@st.com"); +MODULE_AUTHOR("Yannick Fertré yannick.fertre@st.com"); +MODULE_DESCRIPTION("DW MIPI DSI host controller driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:dw-mipi-dsi"); diff --git a/include/dw_mipi_dsi.h b/include/dw_mipi_dsi.h new file mode 100644 index 0000000..266c94b --- /dev/null +++ b/include/dw_mipi_dsi.h @@ -0,0 +1,34 @@ +/* + * Copyright (C) 2017-2018, STMicroelectronics - All Rights Reserved + * + * Authors: Yannick Fertre yannick.fertre@st.com + * Philippe Cornu philippe.cornu@st.com + * + * Modified by Yannick Fertre yannick.fertre@st.com + * This generic Synopsys DesignWare MIPI DSI host driver is based on the + * bridge synopsys from include/drm/bridge/dw_mipi_dsi.h (kernel linux). + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#ifndef __DW_MIPI_DSI__ +#define __DW_MIPI_DSI__ + +#include <mipi_display.h> + +struct dw_mipi_dsi_phy_ops { + int (*init)(void *priv_data); + int (*get_lane_mbps)(void *priv_data, struct display_timing *timings, + u32 lanes, u32 format, unsigned int *lane_mbps); +}; + +struct dw_mipi_dsi_plat_data { + unsigned int max_data_lanes; + const struct dw_mipi_dsi_phy_ops *phy_ops; + struct udevice *panel; +}; + +int dw_mipi_dsi_init_bridge(struct mipi_dsi_device *device); +void dw_mipi_dsi_bridge_enable(struct mipi_dsi_device *device); + +#endif /* __DW_MIPI_DSI__ */