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OpenCloudOS-Kernel/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
* Copyright (C) STMicroelectronics SA 2017
*
* Modified by Philippe Cornu <philippe.cornu@st.com>
* This generic Synopsys DesignWare MIPI DSI host driver is based on the
* Rockchip version from rockchip/dw-mipi-dsi.c with phy & bridge APIs.
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/debugfs.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <video/mipi_display.h>
#include <drm/bridge/dw_mipi_dsi.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_of.h>
#include <drm/drm_print.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 VID_MODE_VPG_ENABLE BIT(16)
#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
struct dw_mipi_dsi {
struct drm_bridge bridge;
struct mipi_dsi_host dsi_host;
struct drm_bridge *panel_bridge;
struct device *dev;
void __iomem *base;
struct clk *pclk;
unsigned int lane_mbps; /* per lane */
u32 channel;
u32 lanes;
u32 format;
unsigned long mode_flags;
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs;
bool vpg;
bool vpg_horizontal;
#endif /* CONFIG_DEBUG_FS */
struct dw_mipi_dsi *master; /* dual-dsi master ptr */
struct dw_mipi_dsi *slave; /* dual-dsi slave ptr */
const struct dw_mipi_dsi_plat_data *plat_data;
};
/*
* Check if either a link to a master or slave is present
*/
static inline bool dw_mipi_is_dual_mode(struct dw_mipi_dsi *dsi)
{
return dsi->slave || dsi->master;
}
/*
* 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;
msleep(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 struct dw_mipi_dsi *bridge_to_dsi(struct drm_bridge *bridge)
{
return container_of(bridge, struct dw_mipi_dsi, bridge);
}
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 drm_bridge *bridge;
struct drm_panel *panel;
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;
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);
}
dsi->panel_bridge = bridge;
drm_bridge_add(&dsi->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 int dw_mipi_dsi_host_detach(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;
int ret;
if (pdata->host_ops && pdata->host_ops->detach) {
ret = pdata->host_ops->detach(pdata->priv_data, device);
if (ret < 0)
return ret;
}
drm_of_panel_bridge_remove(host->dev->of_node, 1, 0);
drm_bridge_remove(&dsi->bridge);
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), 1000,
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,
1000, 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), 1000,
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),
1000, 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),
1000, 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);
if (dsi->slave)
dw_mipi_message_config(dsi->slave, msg);
ret = dw_mipi_dsi_write(dsi, &packet);
if (ret)
return ret;
if (dsi->slave) {
ret = dw_mipi_dsi_write(dsi->slave, &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,
.detach = dw_mipi_dsi_host_detach,
.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;
#ifdef CONFIG_DEBUG_FS
if (dsi->vpg) {
val |= VID_MODE_VPG_ENABLE;
val |= dsi->vpg_horizontal ? VID_MODE_VPG_HORIZONTAL : 0;
}
#endif /* CONFIG_DEBUG_FS */
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_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)
{
/*
* 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,
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);
/*
* 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,
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,
dw_mipi_is_dual_mode(dsi) ?
VID_PKT_SIZE(mode->hdisplay / 2) :
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(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,
const struct drm_display_mode *mode,
u32 hcomponent)
{
u32 frac, lbcc;
lbcc = hcomponent * dsi->lane_mbps * MSEC_PER_SEC / 8;
frac = lbcc % mode->clock;
lbcc = lbcc / mode->clock;
if (frac)
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, 1000, 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, 1000,
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_disable(struct drm_bridge *bridge)
{
struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
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);
/*
* TODO Only way found to call panel-bridge post_disable &
* panel unprepare before the dsi "final" disable...
* This needs to be fixed in the drm_bridge framework and the API
* needs to be updated to manage our own call chains...
*/
if (dsi->panel_bridge->funcs->post_disable)
dsi->panel_bridge->funcs->post_disable(dsi->panel_bridge);
if (phy_ops->power_off)
phy_ops->power_off(dsi->plat_data->priv_data);
if (dsi->slave) {
dw_mipi_dsi_disable(dsi->slave);
clk_disable_unprepare(dsi->slave->pclk);
pm_runtime_put(dsi->slave->dev);
}
dw_mipi_dsi_disable(dsi);
clk_disable_unprepare(dsi->pclk);
pm_runtime_put(dsi->dev);
}
static unsigned int dw_mipi_dsi_get_lanes(struct dw_mipi_dsi *dsi)
{
/* this instance is the slave, so add the master's lanes */
if (dsi->master)
return dsi->master->lanes + dsi->lanes;
/* this instance is the master, so add the slave's lanes */
if (dsi->slave)
return dsi->lanes + dsi->slave->lanes;
/* single-dsi, 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");
pm_runtime_get_sync(dsi->dev);
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 void dw_mipi_dsi_bridge_mode_set(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
const struct drm_display_mode *adjusted_mode)
{
struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
dw_mipi_dsi_mode_set(dsi, adjusted_mode);
if (dsi->slave)
dw_mipi_dsi_mode_set(dsi->slave, adjusted_mode);
}
static void dw_mipi_dsi_bridge_enable(struct drm_bridge *bridge)
{
struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
/* Switch to video mode for panel-bridge enable & panel enable */
dw_mipi_dsi_set_mode(dsi, MIPI_DSI_MODE_VIDEO);
if (dsi->slave)
dw_mipi_dsi_set_mode(dsi->slave, MIPI_DSI_MODE_VIDEO);
}
static enum drm_mode_status
dw_mipi_dsi_bridge_mode_valid(struct drm_bridge *bridge,
const struct drm_display_info *info,
const struct drm_display_mode *mode)
{
struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
const struct dw_mipi_dsi_plat_data *pdata = dsi->plat_data;
enum drm_mode_status mode_status = MODE_OK;
if (pdata->mode_valid)
mode_status = pdata->mode_valid(pdata->priv_data, mode);
return mode_status;
}
static int dw_mipi_dsi_bridge_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
if (!bridge->encoder) {
DRM_ERROR("Parent encoder object not found\n");
return -ENODEV;
}
/* Set the encoder type as caller does not know it */
bridge->encoder->encoder_type = DRM_MODE_ENCODER_DSI;
/* Attach the panel-bridge to the dsi bridge */
return drm_bridge_attach(bridge->encoder, dsi->panel_bridge, bridge,
flags);
}
static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
.mode_set = dw_mipi_dsi_bridge_mode_set,
.enable = dw_mipi_dsi_bridge_enable,
.post_disable = dw_mipi_dsi_bridge_post_disable,
.mode_valid = dw_mipi_dsi_bridge_mode_valid,
.attach = dw_mipi_dsi_bridge_attach,
};
#ifdef CONFIG_DEBUG_FS
static void dw_mipi_dsi_debugfs_init(struct dw_mipi_dsi *dsi)
{
dsi->debugfs = debugfs_create_dir(dev_name(dsi->dev), NULL);
if (IS_ERR(dsi->debugfs)) {
dev_err(dsi->dev, "failed to create debugfs root\n");
return;
}
debugfs_create_bool("vpg", 0660, dsi->debugfs, &dsi->vpg);
debugfs_create_bool("vpg_horizontal", 0660, dsi->debugfs,
&dsi->vpg_horizontal);
}
static void dw_mipi_dsi_debugfs_remove(struct dw_mipi_dsi *dsi)
{
debugfs_remove_recursive(dsi->debugfs);
}
#else
static void dw_mipi_dsi_debugfs_init(struct dw_mipi_dsi *dsi) { }
static void dw_mipi_dsi_debugfs_remove(struct dw_mipi_dsi *dsi) { }
#endif /* CONFIG_DEBUG_FS */
static struct dw_mipi_dsi *
__dw_mipi_dsi_probe(struct platform_device *pdev,
const struct dw_mipi_dsi_plat_data *plat_data)
{
struct device *dev = &pdev->dev;
struct reset_control *apb_rst;
struct dw_mipi_dsi *dsi;
int ret;
dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
if (!dsi)
return ERR_PTR(-ENOMEM);
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) {
DRM_ERROR("Phy not properly configured\n");
return ERR_PTR(-ENODEV);
}
if (!plat_data->base) {
dsi->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(dsi->base))
return ERR_PTR(-ENODEV);
} else {
dsi->base = plat_data->base;
}
dsi->pclk = devm_clk_get(dev, "pclk");
if (IS_ERR(dsi->pclk)) {
ret = PTR_ERR(dsi->pclk);
dev_err(dev, "Unable to get pclk: %d\n", ret);
return ERR_PTR(ret);
}
/*
* 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 = devm_reset_control_get_optional_exclusive(dev, "apb");
if (IS_ERR(apb_rst)) {
ret = PTR_ERR(apb_rst);
if (ret != -EPROBE_DEFER)
dev_err(dev, "Unable to get reset control: %d\n", ret);
return ERR_PTR(ret);
}
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);
usleep_range(10, 20);
reset_control_deassert(apb_rst);
clk_disable_unprepare(dsi->pclk);
}
dw_mipi_dsi_debugfs_init(dsi);
pm_runtime_enable(dev);
dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
dsi->dsi_host.dev = dev;
ret = mipi_dsi_host_register(&dsi->dsi_host);
if (ret) {
dev_err(dev, "Failed to register MIPI host: %d\n", ret);
dw_mipi_dsi_debugfs_remove(dsi);
return ERR_PTR(ret);
}
dsi->bridge.driver_private = dsi;
dsi->bridge.funcs = &dw_mipi_dsi_bridge_funcs;
#ifdef CONFIG_OF
dsi->bridge.of_node = pdev->dev.of_node;
#endif
return dsi;
}
static void __dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
{
mipi_dsi_host_unregister(&dsi->dsi_host);
pm_runtime_disable(dsi->dev);
dw_mipi_dsi_debugfs_remove(dsi);
}
void dw_mipi_dsi_set_slave(struct dw_mipi_dsi *dsi, struct dw_mipi_dsi *slave)
{
/* introduce controllers to each other */
dsi->slave = slave;
dsi->slave->master = dsi;
/* migrate settings for already attached displays */
dsi->slave->lanes = dsi->lanes;
dsi->slave->channel = dsi->channel;
dsi->slave->format = dsi->format;
dsi->slave->mode_flags = dsi->mode_flags;
}
EXPORT_SYMBOL_GPL(dw_mipi_dsi_set_slave);
/*
* Probe/remove API, used from platforms based on the DRM bridge API.
*/
struct dw_mipi_dsi *
dw_mipi_dsi_probe(struct platform_device *pdev,
const struct dw_mipi_dsi_plat_data *plat_data)
{
return __dw_mipi_dsi_probe(pdev, plat_data);
}
EXPORT_SYMBOL_GPL(dw_mipi_dsi_probe);
void dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
{
__dw_mipi_dsi_remove(dsi);
}
EXPORT_SYMBOL_GPL(dw_mipi_dsi_remove);
/*
* Bind/unbind API, used from platforms based on the component framework.
*/
int dw_mipi_dsi_bind(struct dw_mipi_dsi *dsi, struct drm_encoder *encoder)
{
int ret;
ret = drm_bridge_attach(encoder, &dsi->bridge, NULL, 0);
if (ret) {
DRM_ERROR("Failed to initialize bridge with drm\n");
return ret;
}
return ret;
}
EXPORT_SYMBOL_GPL(dw_mipi_dsi_bind);
void dw_mipi_dsi_unbind(struct dw_mipi_dsi *dsi)
{
}
EXPORT_SYMBOL_GPL(dw_mipi_dsi_unbind);
MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
MODULE_DESCRIPTION("DW MIPI DSI host controller driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:dw-mipi-dsi");
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