// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2017 Samsung Electronics
*
* Authors:
* Tomasz Stanislawski <t.stanislaws@samsung.com>
* Maciej Purski <m.purski@samsung.com>
*
* Based on sii9234 driver created by:
* Adam Hampson <ahampson@sta.samsung.com>
* Erik Gilling <konkers@android.com>
* Shankar Bandal <shankar.b@samsung.com>
* Dharam Kumar <dharam.kr@samsung.com>
*/
#include <drm/bridge/mhl.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#define CBUS_DEVCAP_OFFSET 0x80
#define SII9234_MHL_VERSION 0x11
#define SII9234_SCRATCHPAD_SIZE 0x10
#define SII9234_INT_STAT_SIZE 0x33
#define BIT_TMDS_CCTRL_TMDS_OE BIT(4)
#define MHL_HPD_OUT_OVR_EN BIT(4)
#define MHL_HPD_OUT_OVR_VAL BIT(5)
#define MHL_INIT_TIMEOUT 0x0C
/* MHL Tx registers and bits */
#define MHL_TX_SRST 0x05
#define MHL_TX_SYSSTAT_REG 0x09
#define MHL_TX_INTR1_REG 0x71
#define MHL_TX_INTR4_REG 0x74
#define MHL_TX_INTR1_ENABLE_REG 0x75
#define MHL_TX_INTR4_ENABLE_REG 0x78
#define MHL_TX_INT_CTRL_REG 0x79
#define MHL_TX_TMDS_CCTRL 0x80
#define MHL_TX_DISC_CTRL1_REG 0x90
#define MHL_TX_DISC_CTRL2_REG 0x91
#define MHL_TX_DISC_CTRL3_REG 0x92
#define MHL_TX_DISC_CTRL4_REG 0x93
#define MHL_TX_DISC_CTRL5_REG 0x94
#define MHL_TX_DISC_CTRL6_REG 0x95
#define MHL_TX_DISC_CTRL7_REG 0x96
#define MHL_TX_DISC_CTRL8_REG 0x97
#define MHL_TX_STAT2_REG 0x99
#define MHL_TX_MHLTX_CTL1_REG 0xA0
#define MHL_TX_MHLTX_CTL2_REG 0xA1
#define MHL_TX_MHLTX_CTL4_REG 0xA3
#define MHL_TX_MHLTX_CTL6_REG 0xA5
#define MHL_TX_MHLTX_CTL7_REG 0xA6
#define RSEN_STATUS BIT(2)
#define HPD_CHANGE_INT BIT(6)
#define RSEN_CHANGE_INT BIT(5)
#define RGND_READY_INT BIT(6)
#define VBUS_LOW_INT BIT(5)
#define CBUS_LKOUT_INT BIT(4)
#define MHL_DISC_FAIL_INT BIT(3)
#define MHL_EST_INT BIT(2)
#define HPD_CHANGE_INT_MASK BIT(6)
#define RSEN_CHANGE_INT_MASK BIT(5)
#define RGND_READY_MASK BIT(6)
#define CBUS_LKOUT_MASK BIT(4)
#define MHL_DISC_FAIL_MASK BIT(3)
#define MHL_EST_MASK BIT(2)
#define SKIP_GND BIT(6)
#define ATT_THRESH_SHIFT 0x04
#define ATT_THRESH_MASK (0x03 << ATT_THRESH_SHIFT)
#define USB_D_OEN BIT(3)
#define DEGLITCH_TIME_MASK 0x07
#define DEGLITCH_TIME_2MS 0
#define DEGLITCH_TIME_4MS 1
#define DEGLITCH_TIME_8MS 2
#define DEGLITCH_TIME_16MS 3
#define DEGLITCH_TIME_40MS 4
#define DEGLITCH_TIME_50MS 5
#define DEGLITCH_TIME_60MS 6
#define DEGLITCH_TIME_128MS 7
#define USB_D_OVR BIT(7)
#define USB_ID_OVR BIT(6)
#define DVRFLT_SEL BIT(5)
#define BLOCK_RGND_INT BIT(4)
#define SKIP_DEG BIT(3)
#define CI2CA_POL BIT(2)
#define CI2CA_WKUP BIT(1)
#define SINGLE_ATT BIT(0)
#define USB_D_ODN BIT(5)
#define VBUS_CHECK BIT(2)
#define RGND_INTP_MASK 0x03
#define RGND_INTP_OPEN 0
#define RGND_INTP_2K 1
#define RGND_INTP_1K 2
#define RGND_INTP_SHORT 3
/* HDMI registers */
#define HDMI_RX_TMDS0_CCTRL1_REG 0x10
#define HDMI_RX_TMDS_CLK_EN_REG 0x11
#define HDMI_RX_TMDS_CH_EN_REG 0x12
#define HDMI_RX_PLL_CALREFSEL_REG 0x17
#define HDMI_RX_PLL_VCOCAL_REG 0x1A
#define HDMI_RX_EQ_DATA0_REG 0x22
#define HDMI_RX_EQ_DATA1_REG 0x23
#define HDMI_RX_EQ_DATA2_REG 0x24
#define HDMI_RX_EQ_DATA3_REG 0x25
#define HDMI_RX_EQ_DATA4_REG 0x26
#define HDMI_RX_TMDS_ZONE_CTRL_REG 0x4C
#define HDMI_RX_TMDS_MODE_CTRL_REG 0x4D
/* CBUS registers */
#define CBUS_INT_STATUS_1_REG 0x08
#define CBUS_INTR1_ENABLE_REG 0x09
#define CBUS_MSC_REQ_ABORT_REASON_REG 0x0D
#define CBUS_INT_STATUS_2_REG 0x1E
#define CBUS_INTR2_ENABLE_REG 0x1F
#define CBUS_LINK_CONTROL_2_REG 0x31
#define CBUS_MHL_STATUS_REG_0 0xB0
#define CBUS_MHL_STATUS_REG_1 0xB1
#define BIT_CBUS_RESET BIT(3)
#define SET_HPD_DOWNSTREAM BIT(6)
/* TPI registers */
#define TPI_DPD_REG 0x3D
/* Timeouts in msec */
#define T_SRC_VBUS_CBUS_TO_STABLE 200
#define T_SRC_CBUS_FLOAT 100
#define T_SRC_CBUS_DEGLITCH 2
#define T_SRC_RXSENSE_DEGLITCH 110
#define MHL1_MAX_CLK 75000 /* in kHz */
#define I2C_TPI_ADDR 0x3D
#define I2C_HDMI_ADDR 0x49
#define I2C_CBUS_ADDR 0x64
enum sii9234_state {
ST_OFF,
ST_D3,
ST_RGND_INIT,
ST_RGND_1K,
ST_RSEN_HIGH,
ST_MHL_ESTABLISHED,
ST_FAILURE_DISCOVERY,
ST_FAILURE,
};
struct sii9234 {
struct i2c_client *client[4];
struct drm_bridge bridge;
struct device *dev;
struct gpio_desc *gpio_reset;
int i2c_error;
struct regulator_bulk_data supplies[4];
struct mutex lock; /* Protects fields below and device registers */
enum sii9234_state state;
};
enum sii9234_client_id {
I2C_MHL,
I2C_TPI,
I2C_HDMI,
I2C_CBUS,
};
static const char * const sii9234_client_name[] = {
[I2C_MHL] = "MHL",
[I2C_TPI] = "TPI",
[I2C_HDMI] = "HDMI",
[I2C_CBUS] = "CBUS",
};
static int sii9234_writeb(struct sii9234 *ctx, int id, int offset,
int value)
{
int ret;
struct i2c_client *client = ctx->client[id];
if (ctx->i2c_error)
return ctx->i2c_error;
ret = i2c_smbus_write_byte_data(client, offset, value);
if (ret < 0)
dev_err(ctx->dev, "writeb: %4s[0x%02x] <- 0x%02x\n",
sii9234_client_name[id], offset, value);
ctx->i2c_error = ret;
return ret;
}
static int sii9234_writebm(struct sii9234 *ctx, int id, int offset,
int value, int mask)
{
int ret;
struct i2c_client *client = ctx->client[id];
if (ctx->i2c_error)
return ctx->i2c_error;
ret = i2c_smbus_write_byte(client, offset);
if (ret < 0) {
dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
sii9234_client_name[id], offset, value);
ctx->i2c_error = ret;
return ret;
}
ret = i2c_smbus_read_byte(client);
if (ret < 0) {
dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
sii9234_client_name[id], offset, value);
ctx->i2c_error = ret;
return ret;
}
value = (value & mask) | (ret & ~mask);
ret = i2c_smbus_write_byte_data(client, offset, value);
if (ret < 0) {
dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
sii9234_client_name[id], offset, value);
ctx->i2c_error = ret;
}
return ret;
}
static int sii9234_readb(struct sii9234 *ctx, int id, int offset)
{
int ret;
struct i2c_client *client = ctx->client[id];
if (ctx->i2c_error)
return ctx->i2c_error;
ret = i2c_smbus_write_byte(client, offset);
if (ret < 0) {
dev_err(ctx->dev, "readb: %4s[0x%02x]\n",
sii9234_client_name[id], offset);
ctx->i2c_error = ret;
return ret;
}
ret = i2c_smbus_read_byte(client);
if (ret < 0) {
dev_err(ctx->dev, "readb: %4s[0x%02x]\n",
sii9234_client_name[id], offset);
ctx->i2c_error = ret;
}
return ret;
}
static int sii9234_clear_error(struct sii9234 *ctx)
{
int ret = ctx->i2c_error;
ctx->i2c_error = 0;
return ret;
}
#define mhl_tx_writeb(sii9234, offset, value) \
sii9234_writeb(sii9234, I2C_MHL, offset, value)
#define mhl_tx_writebm(sii9234, offset, value, mask) \
sii9234_writebm(sii9234, I2C_MHL, offset, value, mask)
#define mhl_tx_readb(sii9234, offset) \
sii9234_readb(sii9234, I2C_MHL, offset)
#define cbus_writeb(sii9234, offset, value) \
sii9234_writeb(sii9234, I2C_CBUS, offset, value)
#define cbus_writebm(sii9234, offset, value, mask) \
sii9234_writebm(sii9234, I2C_CBUS, offset, value, mask)
#define cbus_readb(sii9234, offset) \
sii9234_readb(sii9234, I2C_CBUS, offset)
#define hdmi_writeb(sii9234, offset, value) \
sii9234_writeb(sii9234, I2C_HDMI, offset, value)
#define hdmi_writebm(sii9234, offset, value, mask) \
sii9234_writebm(sii9234, I2C_HDMI, offset, value, mask)
#define hdmi_readb(sii9234, offset) \
sii9234_readb(sii9234, I2C_HDMI, offset)
#define tpi_writeb(sii9234, offset, value) \
sii9234_writeb(sii9234, I2C_TPI, offset, value)
#define tpi_writebm(sii9234, offset, value, mask) \
sii9234_writebm(sii9234, I2C_TPI, offset, value, mask)
#define tpi_readb(sii9234, offset) \
sii9234_readb(sii9234, I2C_TPI, offset)
static u8 sii9234_tmds_control(struct sii9234 *ctx, bool enable)
{
mhl_tx_writebm(ctx, MHL_TX_TMDS_CCTRL, enable ? ~0 : 0,
BIT_TMDS_CCTRL_TMDS_OE);
mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, enable ? ~0 : 0,
MHL_HPD_OUT_OVR_EN | MHL_HPD_OUT_OVR_VAL);
return sii9234_clear_error(ctx);
}
static int sii9234_cbus_reset(struct sii9234 *ctx)
{
int i;
mhl_tx_writebm(ctx, MHL_TX_SRST, ~0, BIT_CBUS_RESET);
msleep(T_SRC_CBUS_DEGLITCH);
mhl_tx_writebm(ctx, MHL_TX_SRST, 0, BIT_CBUS_RESET);
for (i = 0; i < 4; i++) {
/*
* Enable WRITE_STAT interrupt for writes to all
* 4 MSC Status registers.
*/
cbus_writeb(ctx, 0xE0 + i, 0xF2);
/*
* Enable SET_INT interrupt for writes to all
* 4 MSC Interrupt registers.
*/
cbus_writeb(ctx, 0xF0 + i, 0xF2);
}
return sii9234_clear_error(ctx);
}
/* Require to chek mhl imformation of samsung in cbus_init_register */
static int sii9234_cbus_init(struct sii9234 *ctx)
{
cbus_writeb(ctx, 0x07, 0xF2);
cbus_writeb(ctx, 0x40, 0x03);
cbus_writeb(ctx, 0x42, 0x06);
cbus_writeb(ctx, 0x36, 0x0C);
cbus_writeb(ctx, 0x3D, 0xFD);
cbus_writeb(ctx, 0x1C, 0x01);
cbus_writeb(ctx, 0x1D, 0x0F);
cbus_writeb(ctx, 0x44, 0x02);
/* Setup our devcap */
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEV_STATE, 0x00);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_MHL_VERSION,
SII9234_MHL_VERSION);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_CAT,
MHL_DCAP_CAT_SOURCE);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_ADOPTER_ID_H, 0x01);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_ADOPTER_ID_L, 0x41);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_VID_LINK_MODE,
MHL_DCAP_VID_LINK_RGB444 | MHL_DCAP_VID_LINK_YCBCR444);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_VIDEO_TYPE,
MHL_DCAP_VT_GRAPHICS);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_LOG_DEV_MAP,
MHL_DCAP_LD_GUI);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_BANDWIDTH, 0x0F);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_FEATURE_FLAG,
MHL_DCAP_FEATURE_RCP_SUPPORT | MHL_DCAP_FEATURE_RAP_SUPPORT
| MHL_DCAP_FEATURE_SP_SUPPORT);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEVICE_ID_H, 0x0);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEVICE_ID_L, 0x0);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_SCRATCHPAD_SIZE,
SII9234_SCRATCHPAD_SIZE);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_INT_STAT_SIZE,
SII9234_INT_STAT_SIZE);
cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_RESERVED, 0);
cbus_writebm(ctx, 0x31, 0x0C, 0x0C);
cbus_writeb(ctx, 0x30, 0x01);
cbus_writebm(ctx, 0x3C, 0x30, 0x38);
cbus_writebm(ctx, 0x22, 0x0D, 0x0F);
cbus_writebm(ctx, 0x2E, 0x15, 0x15);
cbus_writeb(ctx, CBUS_INTR1_ENABLE_REG, 0);
cbus_writeb(ctx, CBUS_INTR2_ENABLE_REG, 0);
return sii9234_clear_error(ctx);
}
static void force_usb_id_switch_open(struct sii9234 *ctx)
{
/* Disable CBUS discovery */
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, 0, 0x01);
/* Force USB ID switch to open */
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, USB_ID_OVR);
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL3_REG, ~0, 0x86);
/* Force upstream HPD to 0 when not in MHL mode. */
mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 0x30);
}
static void release_usb_id_switch_open(struct sii9234 *ctx)
{
msleep(T_SRC_CBUS_FLOAT);
/* Clear USB ID switch to open */
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, 0, USB_ID_OVR);
/* Enable CBUS discovery */
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, ~0, 0x01);
}
static int sii9234_power_init(struct sii9234 *ctx)
{
/* Force the SiI9234 into the D0 state. */
tpi_writeb(ctx, TPI_DPD_REG, 0x3F);
/* Enable TxPLL Clock */
hdmi_writeb(ctx, HDMI_RX_TMDS_CLK_EN_REG, 0x01);
/* Enable Tx Clock Path & Equalizer */
hdmi_writeb(ctx, HDMI_RX_TMDS_CH_EN_REG, 0x15);
/* Power Up TMDS */
mhl_tx_writeb(ctx, 0x08, 0x35);
return sii9234_clear_error(ctx);
}
static int sii9234_hdmi_init(struct sii9234 *ctx)
{
hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1);
hdmi_writeb(ctx, HDMI_RX_PLL_CALREFSEL_REG, 0x03);
hdmi_writeb(ctx, HDMI_RX_PLL_VCOCAL_REG, 0x20);
hdmi_writeb(ctx, HDMI_RX_EQ_DATA0_REG, 0x8A);
hdmi_writeb(ctx, HDMI_RX_EQ_DATA1_REG, 0x6A);
hdmi_writeb(ctx, HDMI_RX_EQ_DATA2_REG, 0xAA);
hdmi_writeb(ctx, HDMI_RX_EQ_DATA3_REG, 0xCA);
hdmi_writeb(ctx, HDMI_RX_EQ_DATA4_REG, 0xEA);
hdmi_writeb(ctx, HDMI_RX_TMDS_ZONE_CTRL_REG, 0xA0);
hdmi_writeb(ctx, HDMI_RX_TMDS_MODE_CTRL_REG, 0x00);
mhl_tx_writeb(ctx, MHL_TX_TMDS_CCTRL, 0x34);
hdmi_writeb(ctx, 0x45, 0x44);
hdmi_writeb(ctx, 0x31, 0x0A);
hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1);
return sii9234_clear_error(ctx);
}
static int sii9234_mhl_tx_ctl_int(struct sii9234 *ctx)
{
mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL1_REG, 0xD0);
mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL2_REG, 0xFC);
mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL4_REG, 0xEB);
mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL7_REG, 0x0C);
return sii9234_clear_error(ctx);
}
static int sii9234_reset(struct sii9234 *ctx)
{
int ret;
sii9234_clear_error(ctx);
ret = sii9234_power_init(ctx);
if (ret < 0)
return ret;
ret = sii9234_cbus_reset(ctx);
if (ret < 0)
return ret;
ret = sii9234_hdmi_init(ctx);
if (ret < 0)
return ret;
ret = sii9234_mhl_tx_ctl_int(ctx);
if (ret < 0)
return ret;
/* Enable HDCP Compliance safety */
mhl_tx_writeb(ctx, 0x2B, 0x01);
/* CBUS discovery cycle time for each drive and float = 150us */
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, 0x04, 0x06);
/* Clear bit 6 (reg_skip_rgnd) */
mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL2_REG, (1 << 7) /* Reserved */
| 2 << ATT_THRESH_SHIFT | DEGLITCH_TIME_50MS);
/*
* Changed from 66 to 65 for 94[1:0] = 01 = 5k reg_cbusmhl_pup_sel
* 1.8V CBUS VTH & GND threshold
* to meet CTS 3.3.7.2 spec
*/
mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL5_REG, 0x77);
cbus_writebm(ctx, CBUS_LINK_CONTROL_2_REG, ~0, MHL_INIT_TIMEOUT);
mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL6_REG, 0xA0);
/* RGND & single discovery attempt (RGND blocking) */
mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL6_REG, BLOCK_RGND_INT |
DVRFLT_SEL | SINGLE_ATT);
/* Use VBUS path of discovery state machine */
mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL8_REG, 0);
/* 0x92[3] sets the CBUS / ID switch */
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, USB_ID_OVR);
/*
* To allow RGND engine to operate correctly.
* When moving the chip from D2 to D0 (power up, init regs)
* the values should be
* 94[1:0] = 01 reg_cbusmhl_pup_sel[1:0] should be set for 5k
* 93[7:6] = 10 reg_cbusdisc_pup_sel[1:0] should be
* set for 10k (default)
* 93[5:4] = 00 reg_cbusidle_pup_sel[1:0] = open (default)
*/
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL3_REG, ~0, 0x86);
/*
* Change from CC to 8C to match 5K
* to meet CTS 3.3.72 spec
*/
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, ~0, 0x8C);
/* Configure the interrupt as active high */
mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 0x06);
msleep(25);
/* Release usb_id switch */
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, 0, USB_ID_OVR);
mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL1_REG, 0x27);
ret = sii9234_clear_error(ctx);
if (ret < 0)
return ret;
ret = sii9234_cbus_init(ctx);
if (ret < 0)
return ret;
/* Enable Auto soft reset on SCDT = 0 */
mhl_tx_writeb(ctx, 0x05, 0x04);
/* HDMI Transcode mode enable */
mhl_tx_writeb(ctx, 0x0D, 0x1C);
mhl_tx_writeb(ctx, MHL_TX_INTR4_ENABLE_REG,
RGND_READY_MASK | CBUS_LKOUT_MASK
| MHL_DISC_FAIL_MASK | MHL_EST_MASK);
mhl_tx_writeb(ctx, MHL_TX_INTR1_ENABLE_REG, 0x60);
/* This point is very important before measure RGND impedance */
force_usb_id_switch_open(ctx);
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, 0, 0xF0);
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL5_REG, 0, 0x03);
release_usb_id_switch_open(ctx);
/* Force upstream HPD to 0 when not in MHL mode */
mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 1 << 5);
mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, ~0, 1 << 4);
return sii9234_clear_error(ctx);
}
static int sii9234_goto_d3(struct sii9234 *ctx)
{
int ret;
dev_dbg(ctx->dev, "sii9234: detection started d3\n");
ret = sii9234_reset(ctx);
if (ret < 0)
goto exit;
hdmi_writeb(ctx, 0x01, 0x03);
tpi_writebm(ctx, TPI_DPD_REG, 0, 1);
/* I2C above is expected to fail because power goes down */
sii9234_clear_error(ctx);
ctx->state = ST_D3;
return 0;
exit:
dev_err(ctx->dev, "%s failed\n", __func__);
return -1;
}
static int sii9234_hw_on(struct sii9234 *ctx)
{
return regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
}
static void sii9234_hw_off(struct sii9234 *ctx)
{
gpiod_set_value(ctx->gpio_reset, 1);
msleep(20);
regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
}
static void sii9234_hw_reset(struct sii9234 *ctx)
{
gpiod_set_value(ctx->gpio_reset, 1);
msleep(20);
gpiod_set_value(ctx->gpio_reset, 0);
}
static void sii9234_cable_in(struct sii9234 *ctx)
{
int ret;
mutex_lock(&ctx->lock);
if (ctx->state != ST_OFF)
goto unlock;
ret = sii9234_hw_on(ctx);
if (ret < 0)
goto unlock;
sii9234_hw_reset(ctx);
sii9234_goto_d3(ctx);
/* To avoid irq storm, when hw is in meta state */
enable_irq(to_i2c_client(ctx->dev)->irq);
unlock:
mutex_unlock(&ctx->lock);
}
static void sii9234_cable_out(struct sii9234 *ctx)
{
mutex_lock(&ctx->lock);
if (ctx->state == ST_OFF)
goto unlock;
disable_irq(to_i2c_client(ctx->dev)->irq);
tpi_writeb(ctx, TPI_DPD_REG, 0);
/* Turn on&off hpd festure for only QCT HDMI */
sii9234_hw_off(ctx);
ctx->state = ST_OFF;
unlock:
mutex_unlock(&ctx->lock);
}
static enum sii9234_state sii9234_rgnd_ready_irq(struct sii9234 *ctx)
{
int value;
if (ctx->state == ST_D3) {
int ret;
dev_dbg(ctx->dev, "RGND_READY_INT\n");
sii9234_hw_reset(ctx);
ret = sii9234_reset(ctx);
if (ret < 0) {
dev_err(ctx->dev, "sii9234_reset() failed\n");
return ST_FAILURE;
}
return ST_RGND_INIT;
}
/* Got interrupt in inappropriate state */
if (ctx->state != ST_RGND_INIT)
return ST_FAILURE;
value = mhl_tx_readb(ctx, MHL_TX_STAT2_REG);
if (sii9234_clear_error(ctx))
return ST_FAILURE;
if ((value & RGND_INTP_MASK) != RGND_INTP_1K) {
dev_warn(ctx->dev, "RGND is not 1k\n");
return ST_RGND_INIT;
}
dev_dbg(ctx->dev, "RGND 1K!!\n");
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, ~0, 0x8C);
mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL5_REG, 0x77);
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, 0x05);
if (sii9234_clear_error(ctx))
return ST_FAILURE;
msleep(T_SRC_VBUS_CBUS_TO_STABLE);
return ST_RGND_1K;
}
static enum sii9234_state sii9234_mhl_established(struct sii9234 *ctx)
{
dev_dbg(ctx->dev, "mhl est interrupt\n");
/* Discovery override */
mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL1_REG, 0x10);
/* Increase DDC translation layer timer (byte mode) */
cbus_writeb(ctx, 0x07, 0x32);
cbus_writebm(ctx, 0x44, ~0, 1 << 1);
/* Keep the discovery enabled. Need RGND interrupt */
mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, ~0, 1);
mhl_tx_writeb(ctx, MHL_TX_INTR1_ENABLE_REG,
RSEN_CHANGE_INT_MASK | HPD_CHANGE_INT_MASK);
if (sii9234_clear_error(ctx))
return ST_FAILURE;
return ST_MHL_ESTABLISHED;
}
static enum sii9234_state sii9234_hpd_change(struct sii9234 *ctx)
{
int value;
value = cbus_readb(ctx, CBUS_MSC_REQ_ABORT_REASON_REG);
if (sii9234_clear_error(ctx))
return ST_FAILURE;
if (value & SET_HPD_DOWNSTREAM) {
/* Downstream HPD High, Enable TMDS */
sii9234_tmds_control(ctx, true);
} else {
/* Downstream HPD Low, Disable TMDS */
sii9234_tmds_control(ctx, false);
}
return ctx->state;
}
static enum sii9234_state sii9234_rsen_change(struct sii9234 *ctx)
{
int value;
/* Work_around code to handle wrong interrupt */
if (ctx->state != ST_RGND_1K) {
dev_err(ctx->dev, "RSEN_HIGH without RGND_1K\n");
return ST_FAILURE;
}
value = mhl_tx_readb(ctx, MHL_TX_SYSSTAT_REG);
if (value < 0)
return ST_FAILURE;
if (value & RSEN_STATUS) {
dev_dbg(ctx->dev, "MHL cable connected.. RSEN High\n");
return ST_RSEN_HIGH;
}
dev_dbg(ctx->dev, "RSEN lost\n");
/*
* Once RSEN loss is confirmed,we need to check
* based on cable status and chip power status,whether
* it is SINK Loss(HDMI cable not connected, TV Off)
* or MHL cable disconnection
* TODO: Define the below mhl_disconnection()
*/
msleep(T_SRC_RXSENSE_DEGLITCH);
value = mhl_tx_readb(ctx, MHL_TX_SYSSTAT_REG);
if (value < 0)
return ST_FAILURE;
dev_dbg(ctx->dev, "sys_stat: %x\n", value);
if (value & RSEN_STATUS) {
dev_dbg(ctx->dev, "RSEN recovery\n");
return ST_RSEN_HIGH;
}
dev_dbg(ctx->dev, "RSEN Really LOW\n");
/* To meet CTS 3.3.22.2 spec */
sii9234_tmds_control(ctx, false);
force_usb_id_switch_open(ctx);
release_usb_id_switch_open(ctx);
return ST_FAILURE;
}
static irqreturn_t sii9234_irq_thread(int irq, void *data)
{
struct sii9234 *ctx = data;
int intr1, intr4;
int intr1_en, intr4_en;
int cbus_intr1, cbus_intr2;
dev_dbg(ctx->dev, "%s\n", __func__);
mutex_lock(&ctx->lock);
intr1 = mhl_tx_readb(ctx, MHL_TX_INTR1_REG);
intr4 = mhl_tx_readb(ctx, MHL_TX_INTR4_REG);
intr1_en = mhl_tx_readb(ctx, MHL_TX_INTR1_ENABLE_REG);
intr4_en = mhl_tx_readb(ctx, MHL_TX_INTR4_ENABLE_REG);
cbus_intr1 = cbus_readb(ctx, CBUS_INT_STATUS_1_REG);
cbus_intr2 = cbus_readb(ctx, CBUS_INT_STATUS_2_REG);
if (sii9234_clear_error(ctx))
goto done;
dev_dbg(ctx->dev, "irq %02x/%02x %02x/%02x %02x/%02x\n",
intr1, intr1_en, intr4, intr4_en, cbus_intr1, cbus_intr2);
if (intr4 & RGND_READY_INT)
ctx->state = sii9234_rgnd_ready_irq(ctx);
if (intr1 & RSEN_CHANGE_INT)
ctx->state = sii9234_rsen_change(ctx);
if (intr4 & MHL_EST_INT)
ctx->state = sii9234_mhl_established(ctx);
if (intr1 & HPD_CHANGE_INT)
ctx->state = sii9234_hpd_change(ctx);
if (intr4 & CBUS_LKOUT_INT)
ctx->state = ST_FAILURE;
if (intr4 & MHL_DISC_FAIL_INT)
ctx->state = ST_FAILURE_DISCOVERY;
done:
/* Clean interrupt status and pending flags */
mhl_tx_writeb(ctx, MHL_TX_INTR1_REG, intr1);
mhl_tx_writeb(ctx, MHL_TX_INTR4_REG, intr4);
cbus_writeb(ctx, CBUS_MHL_STATUS_REG_0, 0xFF);
cbus_writeb(ctx, CBUS_MHL_STATUS_REG_1, 0xFF);
cbus_writeb(ctx, CBUS_INT_STATUS_1_REG, cbus_intr1);
cbus_writeb(ctx, CBUS_INT_STATUS_2_REG, cbus_intr2);
sii9234_clear_error(ctx);
if (ctx->state == ST_FAILURE) {
dev_dbg(ctx->dev, "try to reset after failure\n");
sii9234_hw_reset(ctx);
sii9234_goto_d3(ctx);
}
if (ctx->state == ST_FAILURE_DISCOVERY) {
dev_err(ctx->dev, "discovery failed, no power for MHL?\n");
tpi_writebm(ctx, TPI_DPD_REG, 0, 1);
ctx->state = ST_D3;
}
mutex_unlock(&ctx->lock);
return IRQ_HANDLED;
}
static int sii9234_init_resources(struct sii9234 *ctx,
struct i2c_client *client)
{
struct i2c_adapter *adapter = client->adapter;
int ret;
if (!ctx->dev->of_node) {
dev_err(ctx->dev, "not DT device\n");
return -ENODEV;
}
ctx->gpio_reset = devm_gpiod_get(ctx->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(ctx->gpio_reset)) {
dev_err(ctx->dev, "failed to get reset gpio from DT\n");
return PTR_ERR(ctx->gpio_reset);
}
ctx->supplies[0].supply = "avcc12";
ctx->supplies[1].supply = "avcc33";
ctx->supplies[2].supply = "iovcc18";
ctx->supplies[3].supply = "cvcc12";
ret = devm_regulator_bulk_get(ctx->dev, 4, ctx->supplies);
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(ctx->dev, "regulator_bulk failed\n");
return ret;
}
ctx->client[I2C_MHL] = client;
ctx->client[I2C_TPI] = devm_i2c_new_dummy_device(&client->dev, adapter,
I2C_TPI_ADDR);
if (IS_ERR(ctx->client[I2C_TPI])) {
dev_err(ctx->dev, "failed to create TPI client\n");
return PTR_ERR(ctx->client[I2C_TPI]);
}
ctx->client[I2C_HDMI] = devm_i2c_new_dummy_device(&client->dev, adapter,
I2C_HDMI_ADDR);
if (IS_ERR(ctx->client[I2C_HDMI])) {
dev_err(ctx->dev, "failed to create HDMI RX client\n");
return PTR_ERR(ctx->client[I2C_HDMI]);
}
ctx->client[I2C_CBUS] = devm_i2c_new_dummy_device(&client->dev, adapter,
I2C_CBUS_ADDR);
if (IS_ERR(ctx->client[I2C_CBUS])) {
dev_err(ctx->dev, "failed to create CBUS client\n");
return PTR_ERR(ctx->client[I2C_CBUS]);
}
return 0;
}
static inline struct sii9234 *bridge_to_sii9234(struct drm_bridge *bridge)
{
return container_of(bridge, struct sii9234, bridge);
}
static enum drm_mode_status sii9234_mode_valid(struct drm_bridge *bridge,
const struct drm_display_info *info,
const struct drm_display_mode *mode)
{
if (mode->clock > MHL1_MAX_CLK)
return MODE_CLOCK_HIGH;
return MODE_OK;
}
static const struct drm_bridge_funcs sii9234_bridge_funcs = {
.mode_valid = sii9234_mode_valid,
};
static int sii9234_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = client->adapter;
struct sii9234 *ctx;
struct device *dev = &client->dev;
int ret;
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->dev = dev;
mutex_init(&ctx->lock);
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(dev, "I2C adapter lacks SMBUS feature\n");
return -EIO;
}
if (!client->irq) {
dev_err(dev, "no irq provided\n");
return -EINVAL;
}
irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
ret = devm_request_threaded_irq(dev, client->irq, NULL,
sii9234_irq_thread,
IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
"sii9234", ctx);
if (ret < 0) {
dev_err(dev, "failed to install IRQ handler\n");
return ret;
}
ret = sii9234_init_resources(ctx, client);
if (ret < 0)
return ret;
i2c_set_clientdata(client, ctx);
ctx->bridge.funcs = &sii9234_bridge_funcs;
ctx->bridge.of_node = dev->of_node;
drm_bridge_add(&ctx->bridge);
sii9234_cable_in(ctx);
return 0;
}
static int sii9234_remove(struct i2c_client *client)
{
struct sii9234 *ctx = i2c_get_clientdata(client);
sii9234_cable_out(ctx);
drm_bridge_remove(&ctx->bridge);
return 0;
}
static const struct of_device_id sii9234_dt_match[] = {
{ .compatible = "sil,sii9234" },
{ },
};
MODULE_DEVICE_TABLE(of, sii9234_dt_match);
static const struct i2c_device_id sii9234_id[] = {
{ "SII9234", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, sii9234_id);
static struct i2c_driver sii9234_driver = {
.driver = {
.name = "sii9234",
.of_match_table = sii9234_dt_match,
},
.probe = sii9234_probe,
.remove = sii9234_remove,
.id_table = sii9234_id,
};
module_i2c_driver(sii9234_driver);
MODULE_LICENSE("GPL");