The Designware MIPI-DSI controller is used on both STM32MP1 and Rockchip
RK35x both of which already have a display controller supported in
barebox.
Port the Linux driver in preparation for enabling MIPI-DSI on the
STM32MP1.
Signed-off-by: Ahmad Fatoum <a.fat...@barebox.org>
---
drivers/video/Kconfig | 10 +
drivers/video/Makefile | 1 +
drivers/video/dw_mipi_dsi.c | 1043 +++++++++++++++++++++++++++++++++++
include/video/dw_mipi_dsi.h | 81 +++
4 files changed, 1135 insertions(+)
create mode 100644 drivers/video/dw_mipi_dsi.c
create mode 100644 include/video/dw_mipi_dsi.h
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 4ad7cd6b25d4..818ff4a0f1c8 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -215,4 +215,14 @@ config DRIVER_VIDEO_DW_HDMI
controller. To make use of this driver you need platform specific
glue code to be selected as well.
+config DRIVER_VIDEO_DW_MIPI_DSI
+ tristate "Designware MIPI-DSI support"
+ select DRIVER_VIDEO_MIPI_DSI
+ select VIDEO_VPL
+ select OFTREE
+ help
+ Say Y here if you want to enable support for the Designware MIPI-DSI
+ controller. To make use of this driver you need platform specific
+ glue code to be selected as well.
+
endif
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 9a222fb370aa..73d135776102 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -33,5 +33,6 @@ obj-$(CONFIG_DRIVER_VIDEO_EFI_GOP) += efi_gop.o
obj-$(CONFIG_DRIVER_VIDEO_FB_SSD1307) += ssd1307fb.o
obj-$(CONFIG_BACKLIGHT_RAVE_SP) += rave-sp-backlight.o
obj-$(CONFIG_DRIVER_VIDEO_DW_HDMI) += dw-hdmi.o
+obj-$(CONFIG_DRIVER_VIDEO_DW_MIPI_DSI) += dw_mipi_dsi.o
obj-$(CONFIG_DRIVER_VIDEO_BOCHS) += bochs/
obj-$(CONFIG_DRIVER_VIDEO_ROCKCHIP) += rockchip/
diff --git a/drivers/video/dw_mipi_dsi.c b/drivers/video/dw_mipi_dsi.c
new file mode 100644
index 000000000000..0371806fe893
--- /dev/null
+++ b/drivers/video/dw_mipi_dsi.c
@@ -0,0 +1,1043 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016, Fuzhou Rockchip Electronics Co., Ltd
+ * Copyright (C) 2019, STMicroelectronics - All Rights Reserved
+ * Author(s): Philippe Cornu <philippe.co...@st.com> for STMicroelectronics.
+ * Yannick Fertre <yannick.fer...@st.com> for STMicroelectronics.
+ *
+ * This generic Synopsys DesignWare MIPI DSI host driver is inspired from
+ * the Linux Kernel driver drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c.
+ */
+
+#include <linux/clk.h>
+#include <linux/printk.h>
+#include <errno.h>
+#include <fb.h>
+#include <of_graph.h>
+#include <linux/io.h>
+#include <linux/bitops.h>
+#include <clock.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/reset.h>
+#include <video/vpl.h>
+#include <video/videomode.h>
+#include <video/mipi_dsi.h>
+#include <video/dw_mipi_dsi.h>
+
+#define DRM_DEV_ERROR dev_err
+#define DRM_DEBUG_DRIVER pr_debug
+
+#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 ENABLE_LOW_POWER_CMD BIT(15)
+#define VID_MODE_VPG_ENABLE BIT(16)
+#define VID_MODE_VPG_MODE BIT(20)
+#define VID_MODE_VPG_HORIZONTAL BIT(24)
+
+#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
+
+enum vpg_mode {
+ VPG_DISABLED,
+ VPG_BER,
+ VPG_COLORS_V,
+ VPG_COLORS_H,
+};
+
+struct dw_mipi_dsi {
+ struct mipi_dsi_host dsi_host;
+ struct device *dev;
+ void __iomem *base;
+ struct vpl vpl;
+ struct vpl_bridge *panel_bridge;
+
+ struct clk *pclk;
+
+ unsigned int lane_mbps; /* per lane */
+ u32 channel;
+ u32 lanes;
+ u32 format;
+ unsigned long mode_flags;
+ struct fb_videomode *mode;
+
+ int vpg_mode;
+
+ const struct dw_mipi_dsi_plat_data *plat_data;
+};
+
+/*
+ * The controller should generate 2 frames before
+ * preparing the peripheral.
+ */
+static void dw_mipi_dsi_wait_for_two_frames(const struct drm_display_mode
*mode)
+{
+ int refresh, two_frames;
+
+ refresh = drm_mode_vrefresh(mode);
+ 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);
+ const struct dw_mipi_dsi_plat_data *pdata = dsi->plat_data;
+ struct vpl_bridge *bridge;
+ int ret;
+
+ if (device->lanes > dsi->plat_data->max_data_lanes) {
+ dev_err(dsi->dev, "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;
+
+ bridge = devm_vpl_of_get_bridge(dsi->dev, dsi->dev->of_node, 1, 0);
+ if (IS_ERR(bridge))
+ return PTR_ERR(bridge);
+
+ dsi->panel_bridge = bridge;
+
+ if (pdata->host_ops && pdata->host_ops->attach) {
+ ret = pdata->host_ops->attach(pdata->priv_data, device);
+ if (ret < 0)
+ return ret;
+ }
+
+ 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;
+
+ /*
+ * 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(16)
+ | INVACT_LPCMD_TIME(4));
+
+ if (msg->flags & MIPI_DSI_MSG_REQ_ACK)
+ val |= ACK_RQST_EN;
+ if (lpm)
+ val |= CMD_MODE_ALL_LP;
+
+ dsi_write(dsi, DSI_CMD_MODE_CFG, val);
+
+ val = dsi_read(dsi, DSI_VID_MODE_CFG);
+ if (lpm)
+ val |= ENABLE_LOW_POWER_CMD;
+ else
+ val &= ~ENABLE_LOW_POWER_CMD;
+ dsi_write(dsi, DSI_VID_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) {
+ dev_err(dsi->dev, "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) {
+ dev_err(dsi->dev, "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) {
+ 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 vpg_update(struct dw_mipi_dsi *dsi, u32 *val)
+{
+ *val &= ~(VID_MODE_VPG_ENABLE | VID_MODE_VPG_HORIZONTAL |
+ VID_MODE_VPG_MODE);
+
+ if (dsi->vpg_mode != VPG_DISABLED) {
+ *val |= VID_MODE_VPG_ENABLE;
+ *val |= dsi->vpg_mode == VPG_COLORS_H ?
+ VID_MODE_VPG_HORIZONTAL : 0;
+ *val |= dsi->vpg_mode == VPG_BER ? VID_MODE_VPG_MODE : 0;
+ }
+}
+
+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;
+
+ vpg_update(dsi, &val);
+
+ dsi_write(dsi, DSI_VID_MODE_CFG, val);
+}
+
+static void dw_mipi_dsi_set_mode(struct dw_mipi_dsi *dsi,
+ unsigned long mode_flags)
+{
+ u32 val;
+
+ 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);
+ } else {
+ dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
+ }
+
+ val = PHY_TXREQUESTCLKHS;
+ if (dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)
+ val |= AUTO_CLKLANE_CTRL;
+ dsi_write(dsi, DSI_LPCLK_CTRL, val);
+
+ dsi_write(dsi, DSI_PWR_UP, POWERUP);
+}
+
+static void dw_mipi_dsi_disable(struct dw_mipi_dsi *dsi)
+{
+ dsi_write(dsi, DSI_PWR_UP, RESET);
+ dsi_write(dsi, DSI_PHY_RSTZ, PHY_RSTZ);
+}
+
+static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
+{
+ const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
+ unsigned int esc_rate; /* in MHz */
+ u32 esc_clk_division;
+ int ret;
+
+ /*
+ * The maximum permitted escape clock is 20MHz and it is derived from
+ * lanebyteclk, which is running at "lane_mbps / 8".
+ */
+ if (phy_ops->get_esc_clk_rate) {
+ ret = phy_ops->get_esc_clk_rate(dsi->plat_data->priv_data,
+ &esc_rate);
+ if (ret)
+ DRM_DEBUG_DRIVER("Phy get_esc_clk_rate() failed\n");
+ } else
+ esc_rate = 20; /* Default to 20MHz */
+
+ /*
+ * We want :
+ * (lane_mbps >> 3) / esc_clk_division < X
+ * which is:
+ * (lane_mbps >> 3) / X > esc_clk_division
+ */
+ esc_clk_division = (dsi->lane_mbps >> 3) / esc_rate + 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(0) |
+ TX_ESC_CLK_DIVISION(esc_clk_division));
+}
+
+static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,
+ const struct drm_display_mode *mode)
+{
+ 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 (mode->flags & DRM_MODE_FLAG_NVSYNC)
+ val |= VSYNC_ACTIVE_LOW;
+ if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+ 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);
+}
+
+static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi)
+{
+ u32 val = CRC_RX_EN | ECC_RX_EN | BTA_EN | EOTP_TX_EN;
+
+ if (dsi->mode_flags & MIPI_DSI_MODE_NO_EOT_PACKET)
+ val &= ~EOTP_TX_EN;
+
+ dsi_write(dsi, DSI_PCKHDL_CFG, val);
+}
+
+static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,
+ const struct drm_display_mode *mode)
+{
+ /*
+ * 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(mode->hdisplay));
+}
+
+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(0) | LPRX_TO_CNT(0));
+ /*
+ * 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);
+}
+
+static const u32 minimum_lbccs[] = {10, 5, 4, 3};
+
+static inline u32 dw_mipi_dsi_get_minimum_lbcc(struct dw_mipi_dsi *dsi)
+{
+ return minimum_lbccs[dsi->lanes - 1];
+}
+
+/* Get lane byte clock cycles. */
+static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi,
+ const struct drm_display_mode *mode,
+ u32 hcomponent)
+{
+ u32 frac, lbcc, minimum_lbcc;
+ int bpp;
+
+ if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
+ /* lbcc based on lane_mbps */
+ lbcc = hcomponent * dsi->lane_mbps * MSEC_PER_SEC / 8;
+ } else {
+ /* lbcc based on pixel clock rate */
+ bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
+ if (bpp < 0) {
+ dev_err(dsi->dev, "failed to get bpp\n");
+ return 0;
+ }
+
+ lbcc = div_u64((u64)hcomponent * mode->clock * bpp, dsi->lanes
* 8);
+ }
+
+ frac = lbcc % mode->clock;
+ lbcc = lbcc / mode->clock;
+ if (frac)
+ lbcc++;
+
+ minimum_lbcc = dw_mipi_dsi_get_minimum_lbcc(dsi);
+
+ if (lbcc < minimum_lbcc)
+ lbcc = minimum_lbcc;
+
+ return lbcc;
+}
+
+static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi,
+ const struct drm_display_mode *mode)
+{
+ u32 htotal, hsa, hbp, lbcc;
+
+ htotal = mode->htotal;
+ hsa = mode->hsync_end - mode->hsync_start;
+ hbp = mode->htotal - mode->hsync_end;
+
+ /*
+ * TODO dw drv improvements
+ * computations below may be improved...
+ */
+ lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, htotal);
+ dsi_write(dsi, DSI_VID_HLINE_TIME, lbcc);
+
+ lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, hsa);
+ dsi_write(dsi, DSI_VID_HSA_TIME, lbcc);
+
+ lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, hbp);
+ dsi_write(dsi, DSI_VID_HBP_TIME, lbcc);
+}
+
+static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi,
+ const struct drm_display_mode *mode)
+{
+ u32 vactive, vsa, vfp, vbp;
+
+ vactive = mode->vdisplay;
+ vsa = mode->vsync_end - mode->vsync_start;
+ vfp = mode->vsync_start - mode->vdisplay;
+ vbp = mode->vtotal - mode->vsync_end;
+
+ 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)
+{
+ const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
+ struct dw_mipi_dsi_dphy_timing timing;
+ u32 hw_version;
+ int ret;
+
+ ret = phy_ops->get_timing(dsi->plat_data->priv_data,
+ dsi->lane_mbps, &timing);
+ if (ret)
+ DRM_DEV_ERROR(dsi->dev, "Retrieving phy timings failed\n");
+
+ /*
+ * 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(timing.data_hs2lp) |
+ PHY_LP2HS_TIME_V131(timing.data_lp2hs));
+ dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
+ } else {
+ dsi_write(dsi, DSI_PHY_TMR_CFG,
+ PHY_HS2LP_TIME(timing.data_hs2lp) |
+ PHY_LP2HS_TIME(timing.data_lp2hs) |
+ MAX_RD_TIME(10000));
+ }
+
+ dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG,
+ PHY_CLKHS2LP_TIME(timing.clk_hs2lp) |
+ PHY_CLKLP2HS_TIME(timing.clk_lp2hs));
+}
+
+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)
+ DRM_DEBUG_DRIVER("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)
+ DRM_DEBUG_DRIVER("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_post_atomic_disable(struct dw_mipi_dsi *dsi)
+{
+ const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
+
+ /*
+ * Switch to command mode before panel-bridge post_disable &
+ * panel unprepare.
+ * Note: panel-bridge disable & panel disable has been called
+ * before by the drm framework.
+ */
+ dw_mipi_dsi_set_mode(dsi, 0);
+
+ if (phy_ops->power_off)
+ phy_ops->power_off(dsi->plat_data->priv_data);
+
+ dw_mipi_dsi_disable(dsi);
+ clk_disable_unprepare(dsi->pclk);
+}
+
+static unsigned int dw_mipi_dsi_get_lanes(struct dw_mipi_dsi *dsi)
+{
+ /* only single-dsi supported, so no other instance to consider */
+ return dsi->lanes;
+}
+
+static void dw_mipi_dsi_mode_set(struct dw_mipi_dsi *dsi,
+ const struct drm_display_mode *adjusted_mode)
+{
+ const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
+ void *priv_data = dsi->plat_data->priv_data;
+ int ret;
+ u32 lanes = dw_mipi_dsi_get_lanes(dsi);
+
+ clk_prepare_enable(dsi->pclk);
+
+ ret = phy_ops->get_lane_mbps(priv_data, adjusted_mode, dsi->mode_flags,
+ lanes, dsi->format, &dsi->lane_mbps);
+ if (ret)
+ DRM_DEBUG_DRIVER("Phy get_lane_mbps() failed\n");
+
+ dw_mipi_dsi_init(dsi);
+ dw_mipi_dsi_dpi_config(dsi, adjusted_mode);
+ dw_mipi_dsi_packet_handler_config(dsi);
+ dw_mipi_dsi_video_mode_config(dsi);
+ dw_mipi_dsi_video_packet_config(dsi, adjusted_mode);
+ dw_mipi_dsi_command_mode_config(dsi);
+ dw_mipi_dsi_line_timer_config(dsi, adjusted_mode);
+ dw_mipi_dsi_vertical_timing_config(dsi, adjusted_mode);
+
+ 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(priv_data);
+ if (ret)
+ DRM_DEBUG_DRIVER("Phy init() failed\n");
+
+ dw_mipi_dsi_dphy_enable(dsi);
+
+ dw_mipi_dsi_wait_for_two_frames(adjusted_mode);
+
+ /* Switch to cmd mode for panel-bridge pre_enable & panel prepare */
+ dw_mipi_dsi_set_mode(dsi, 0);
+
+ if (phy_ops->power_on)
+ phy_ops->power_on(dsi->plat_data->priv_data);
+}
+
+static int vpg_param_set(struct param_d *param, void *data)
+{
+ struct dw_mipi_dsi *dsi = data;
+ u32 mode_cfg;
+
+ mode_cfg = dsi_read(dsi, DSI_VID_MODE_CFG);
+
+ vpg_update(dsi, &mode_cfg);
+
+ dsi_write(dsi, DSI_VID_MODE_CFG, mode_cfg);
+
+ return 0;
+}
+
+static int dw_mipi_dsi_ioctl(struct vpl *vpl, unsigned int port,
+ unsigned int cmd, void *data)
+{
+ struct dw_mipi_dsi *dsi = container_of(vpl, struct dw_mipi_dsi, vpl);
+ struct drm_display_mode mode = {};
+
+ switch (cmd) {
+ case VPL_ENABLE:
+ /* Switch to video mode for panel-bridge enable & panel enable
*/
+ dw_mipi_dsi_set_mode(dsi, MIPI_DSI_MODE_VIDEO);
+ break;
+ case VPL_DISABLE:
+ dw_mipi_dsi_bridge_post_atomic_disable(dsi);
+ break;
+ case VPL_PREPARE:
+ /*
+ * We store this to simplify debugging by allowing:
+ * vpl->ioctl(vpl, output_port, VPL_DISABLE, NULL);
+ * vpl->ioctl(vpl, output_port, VPL_PREPARE, NULL);
+ * to possibly get an already enabled display back into command
mode.
+ */
+ if (data)
+ dsi->mode = data;
+ if (!dsi->mode)
+ return -EINVAL;
+ fb_videomode_to_drm_display_mode(dsi->mode, &mode);
+ dw_mipi_dsi_mode_set(dsi, &mode);
+ break;
+ }
+
+ /* Probes should have occured by now */
+ WARN_ON(!dsi->panel_bridge);
+
+ return vpl_bridge_ioctl(dsi->panel_bridge, cmd, data);
+}
+
+static const char *vpg_modes[] = {
+ [VPG_DISABLED] = "disabled",
+ [VPG_BER] = "ber",
+ [VPG_COLORS_V] = "colors",
+ [VPG_COLORS_H] = "colors-horizontal",
+};
+
+static struct dw_mipi_dsi *
+dw_mipi_dsi_probe(struct device *dev,
+ const struct dw_mipi_dsi_plat_data *plat_data)
+{
+ struct dw_mipi_dsi *dsi;
+ struct reset_control *apb_rst;
+ struct resource *iores;
+ int ret;
+
+ dsi = xzalloc(sizeof(*dsi));
+
+ dsi->dev = dev;
+ dsi->plat_data = plat_data;
+
+ if (!plat_data->phy_ops->init || !plat_data->phy_ops->get_lane_mbps ||
+ !plat_data->phy_ops->get_timing) {
+ dev_err(dev, "Phy not properly configured\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ if (!plat_data->base) {
+ iores = dev_request_mem_resource(dev, 0);
+ if (IS_ERR(iores))
+ return ERR_CAST(iores);
+ dsi->base = IOMEM(iores->start);
+ } else {
+ dsi->base = plat_data->base;
+ }
+
+ dsi->pclk = clk_get(dev, "pclk");
+ if (IS_ERR(dsi->pclk))
+ return dev_err_cast_probe(dev, dsi->pclk,
+ "Unable to get pclk\n");
+
+ /*
+ * Note that the reset was not defined in the initial device tree, so
+ * we have to be prepared for it not being found.
+ */
+ apb_rst = reset_control_get_optional(dev, "apb");
+ if (IS_ERR(apb_rst))
+ return dev_err_cast_probe(dev, apb_rst,
+ "Unable to get reset control\n");
+
+ if (apb_rst) {
+ ret = clk_prepare_enable(dsi->pclk);
+ if (ret) {
+ dev_err(dev, "%s: Failed to enable pclk\n", __func__);
+ return ERR_PTR(ret);
+ }
+
+ reset_control_assert(apb_rst);
+ udelay(10);
+ reset_control_deassert(apb_rst);
+
+ clk_disable_unprepare(dsi->pclk);
+ }
+
+ dsi->vpl.node = dev->device_node;
+ dsi->vpl.ioctl = dw_mipi_dsi_ioctl;
+ ret = vpl_register(&dsi->vpl);
+ if (ret)
+ return ERR_PTR(ret);
+
+ dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
+ dsi->dsi_host.dev = dev;
+ ret = mipi_dsi_host_register(&dsi->dsi_host);
+ if (ret)
+ return dev_err_ptr_probe(dev, ret,
+ "Failed to register MIPI host\n");
+
+ /* Expose Video Pattern Generator for debug purposes */
+ dev_add_param_enum(dev, "vpg", vpg_param_set, NULL,
+ &dsi->vpg_mode, vpg_modes,
+ ARRAY_SIZE(vpg_modes), dsi);
+
+ return dsi;
+}
+
+struct dw_mipi_dsi *dw_mipi_dsi_bind(struct device *dev,
+ const struct dw_mipi_dsi_plat_data
*plat_data)
+{
+ return dw_mipi_dsi_probe(dev, plat_data);
+}
+EXPORT_SYMBOL_GPL(dw_mipi_dsi_bind);
+
+struct device_node *dw_mipi_dsi_crtc_node(struct dw_mipi_dsi *dsi)
+{
+ return dsi->dsi_host.dev->of_node;
+}
+EXPORT_SYMBOL_GPL(dw_mipi_dsi_crtc_node);
+
+MODULE_AUTHOR("Chris Zhong <z...@rock-chips.com>");
+MODULE_AUTHOR("Philippe Cornu <philippe.co...@st.com>");
+MODULE_AUTHOR("Yannick Fertré <yannick.fer...@st.com>");
+MODULE_DESCRIPTION("DW MIPI DSI host controller driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:dw-mipi-dsi");
diff --git a/include/video/dw_mipi_dsi.h b/include/video/dw_mipi_dsi.h
new file mode 100644
index 000000000000..9e8b279bb911
--- /dev/null
+++ b/include/video/dw_mipi_dsi.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.co...@st.com>
+ * Yannick Fertre <yannick.fer...@st.com>
+ */
+
+#ifndef __DW_MIPI_DSI__
+#define __DW_MIPI_DSI__
+
+#include <linux/types.h>
+#include <linux/compiler.h>
+
+#include <video/drm/drm_modes.h>
+
+struct drm_display_mode;
+struct dw_mipi_dsi;
+struct mipi_dsi_device;
+struct device;
+
+/**
+ * struct dw_mipi_dsi_dphy_timing - DSI host phy timings
+ * @data_hs2lp: High Speed to Low Speed Data Transition Time
+ * @data_lp2hs: Low Speed to High Speed Data Transition Time
+ * @clk_hs2lp: High Speed to Low Speed Clock Transition Time
+ * @clk_lp2hs: Low Speed to High Speed Clock Transition Time
+ */
+struct dw_mipi_dsi_dphy_timing {
+ u16 data_hs2lp;
+ u16 data_lp2hs;
+ u16 clk_hs2lp;
+ u16 clk_lp2hs;
+};
+
+struct dw_mipi_dsi_phy_ops {
+ int (*init)(void *priv_data);
+ void (*power_on)(void *priv_data);
+ void (*power_off)(void *priv_data);
+ int (*get_lane_mbps)(void *priv_data,
+ const struct drm_display_mode *mode,
+ unsigned long mode_flags, u32 lanes, u32 format,
+ unsigned int *lane_mbps);
+ int (*get_timing)(void *priv_data, unsigned int lane_mbps,
+ struct dw_mipi_dsi_dphy_timing *timing);
+ int (*get_esc_clk_rate)(void *priv_data, unsigned int *esc_clk_rate);
+};
+
+struct dw_mipi_dsi_host_ops {
+ int (*attach)(void *priv_data,
+ struct mipi_dsi_device *dsi);
+ int (*detach)(void *priv_data,
+ struct mipi_dsi_device *dsi);
+};
+
+struct dw_mipi_dsi_plat_data {
+ void __iomem *base;
+ unsigned int max_data_lanes;
+
+ enum drm_mode_status (*mode_valid)(void *priv_data,
+ const struct drm_display_mode *mode,
+ unsigned long mode_flags,
+ u32 lanes, u32 format);
+
+ bool (*mode_fixup)(void *priv_data, const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode);
+
+ const struct dw_mipi_dsi_phy_ops *phy_ops;
+ const struct dw_mipi_dsi_host_ops *host_ops;
+
+ void *priv_data;
+};
+
+struct dw_mipi_dsi *
+dw_mipi_dsi_bind(struct device *dev,
+ const struct dw_mipi_dsi_plat_data *plat_data);
+static inline void dw_mipi_dsi_unbind(struct dw_mipi_dsi *dsi) { }
+
+struct device_node *dw_mipi_dsi_crtc_node(struct dw_mipi_dsi *dsi);
+
+#endif /* __DW_MIPI_DSI__ */
--
2.39.5
