SiI9234 transmitter converts eTMDS/HDMI signal to MHL 1.0.
It is controlled via I2C bus. Its interaction with other
devices in video pipeline is performed mainly on HW level.
The only interaction it does on device driver level is
filtering-out unsupported video modes, it exposes drm_bridge
interface to perform this operation.
This patch is based on the code refactored by Tomasz Stanislawski
<t.stanislaws@xxxxxxxxxxx>, which was initially developed by:
Adam Hampson <ahampson@xxxxxxxxxxxxxxx>
Erik Gilling <konkers@xxxxxxxxxxx>
Shankar Bandal <shankar.b@xxxxxxxxxxx>
Dharam Kumar <dharam.kr@xxxxxxxxxxx>
Signed-off-by: Maciej Purski <m.purski@xxxxxxxxxxx>
---
.../devicetree/bindings/display/bridge/sii9234.txt | 20 +
drivers/gpu/drm/bridge/Kconfig | 8 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/sii9234.c | 1019 ++++++++++++++++++++
4 files changed, 1048 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/bridge/sii9234.txt
create mode 100644 drivers/gpu/drm/bridge/sii9234.c
diff --git a/Documentation/devicetree/bindings/display/bridge/sii9234.txt b/Documentation/devicetree/bindings/display/bridge/sii9234.txt
new file mode 100644
index 0000000..2cdf286
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/sii9234.txt
@@ -0,0 +1,20 @@
+SiI9234 Mobile HD Link Transmitter
+
+Required properties:
+- compatible : "sil,sii9234".
+- reg : I2C address for TPI interface, use 0x39
+- vcc-supply : regulator that supplies the chip
+- interrupts, interrupt-parent: interrupt specifier of INT pin
+- reset-gpios: gpio specifier of RESET pin
+
+Additional compatible properties are also allowed.
+
+Example:
+ sii9234@39 {
+ compatible = "sil,sii9234";
+ reg = <0x39>;
+ vcc-supply = <&vsil>;
+ reset-gpios = <&gpf3 4 GPIO_ACTIVE_HIGH>;
+ interrupt-parent = <&gpf3>;
+ interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;
+ };
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index adf9ae0..f5784e5 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -100,6 +100,14 @@ config DRM_TI_TFP410
---help---
Texas Instruments TFP410 DVI/HDMI Transmitter driver
+config DRM_SII9234
+ tristate "Silicon Image SII9234 Driver"
+ depends on I2C
+ help
+ Say Y here if you want support for the MHL interface.
+ It is an I2C driver, that detects connection of MHL bridge
+ and starts encapsulation of HDMI signal.
+
source "drivers/gpu/drm/bridge/analogix/Kconfig"
source "drivers/gpu/drm/bridge/adv7511/Kconfig"
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index defcf1e..e3d5eb0 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
obj-$(CONFIG_DRM_SII902X) += sii902x.o
+obj-$(CONFIG_DRM_SII9234) += sii9234.o
obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/
obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
diff --git a/drivers/gpu/drm/bridge/sii9234.c b/drivers/gpu/drm/bridge/sii9234.c
new file mode 100644
index 0000000..9c436e7
--- /dev/null
+++ b/drivers/gpu/drm/bridge/sii9234.c
@@ -0,0 +1,1019 @@
+/*
+ * Copyright (C) 2014 Samsung Electronics
+ *
+ * Author: Tomasz Stanislawski <t.stanislaws@xxxxxxxxxxx>
+ *
+ * Based on sii9234 driver created by:
+ * Adam Hampson <ahampson@xxxxxxxxxxxxxxx>
+ * Erik Gilling <konkers@xxxxxxxxxxx>
+ * Shankar Bandal <shankar.b@xxxxxxxxxxx>
+ * Dharam Kumar <dharam.kr@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program
+ *
+ */
+#include <drm/bridge/mhl.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_edid.h>
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio.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/platform_device.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+#include <linux/file.h>
+#include <linux/uaccess.h>
+#include <linux/proc_fs.h>
+#include <linux/extcon.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/extcon.h>
+#include <linux/regulator/machine.h>
+
+/* 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 SET_HPD_DOWNSTREAM (1<<6)
+#define CBUS_INT_STATUS_2_REG 0x1E
+#define CBUS_INTR2_ENABLE_REG 0x1F
+#define CBUS_LINK_CONTROL_2_REG 0x31
+#define CBUS_DEVCAP_DEV_STATE 0x80
+#define CBUS_DEVCAP_MHL_VERSION 0x81
+#define CBUS_DEVCAP_DEV_CAT 0x82
+#define CBUS_DEVCAP_ADOPTER_ID_H 0x83
+#define CBUS_DEVCAP_ADOPTER_ID_L 0x84
+#define CBUS_DEVCAP_VID_LINK_MODE 0x85
+#define CBUS_DEVCAP_AUD_LINK_MODE 0x86
+#define CBUS_DEVCAP_VIDEO_TYPE 0x87
+#define CBUS_DEVCAP_LOG_DEV_MAP 0x88
+#define CBUS_DEVCAP_BANDWIDTH 0x89
+#define CBUS_DEVCAP_DEV_FEATURE_FLAG 0x8A
+#define CBUS_DEVCAP_DEVICE_ID_H 0x8B
+#define CBUS_DEVCAP_DEVICE_ID_L 0x8C
+#define CBUS_DEVCAP_SCRATCHPAD_SIZE 0x8D
+#define CBUS_DEVCAP_INT_STAT_SIZE 0x8E
+#define CBUS_DEVCAP_RESERVED 0x8F
+#define CBUS_MHL_STATUS_REG_0 0xB0
+#define CBUS_MHL_STATUS_REG_1 0xB1
+
+/* TPI registers */
+#define TPI_DPD_REG 0x3D
+
+/* timeouts */
+#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
+
+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 *vcc_supply;
+
+ enum sii9234_state state;
+ struct mutex lock;
+};
+
+enum sii9234_client_id {
+ I2C_MHL,
+ I2C_TPI,
+ I2C_HDMI,
+ I2C_CBUS,
+};
+
+static char *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, 0x10);
+ mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, enable ? ~0 : 0, 0x30);
+ return sii9234_clear_error(ctx);
+}
+
+static int sii9234_cbus_reset(struct sii9234 *ctx)
+{
+ int i;
+
+ /* Reset CBUS */
+ mhl_tx_writebm(ctx, MHL_TX_SRST, ~0, 1 << 3);
+ /* CBUS deglitch - 2ms */
+ msleep(T_SRC_CBUS_DEGLITCH);
+ mhl_tx_writebm(ctx, MHL_TX_SRST, 0, 1 << 3);
+
+ 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 */
+ /* To meet cts 6.3.10.1 spec */
+ cbus_writeb(ctx, CBUS_DEVCAP_DEV_STATE, 0x00);
+ /* mhl version 1.1 */
+ cbus_writeb(ctx, CBUS_DEVCAP_MHL_VERSION, 0x11);
+ cbus_writeb(ctx, CBUS_DEVCAP_DEV_CAT, 0x02);
+ cbus_writeb(ctx, CBUS_DEVCAP_ADOPTER_ID_H, 0x01);
+ cbus_writeb(ctx, CBUS_DEVCAP_ADOPTER_ID_L, 0x41);
+ /* YCbCr444, RGB444 */
+ cbus_writeb(ctx, CBUS_DEVCAP_VID_LINK_MODE, 0x03);
+ cbus_writeb(ctx, CBUS_DEVCAP_VIDEO_TYPE, 0);
+ cbus_writeb(ctx, CBUS_DEVCAP_LOG_DEV_MAP, 0x80);
+ cbus_writeb(ctx, CBUS_DEVCAP_BANDWIDTH, 0x0F);
+ cbus_writeb(ctx, CBUS_DEVCAP_DEV_FEATURE_FLAG, 0x07);
+ cbus_writeb(ctx, CBUS_DEVCAP_DEVICE_ID_H, 0x0);
+ cbus_writeb(ctx, CBUS_DEVCAP_DEVICE_ID_L, 0x0);
+ cbus_writeb(ctx, CBUS_DEVCAP_SCRATCHPAD_SIZE, 0x10);
+ cbus_writeb(ctx, CBUS_DEVCAP_INT_STAT_SIZE, 0x33);
+ cbus_writeb(ctx, CBUS_DEVCAP_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)
+{
+ /* Analog PLL Control bits 5:4 = 2b00 as per char. team. */
+ hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1);
+ /* PLL Calrefsel */
+ hdmi_writeb(ctx, HDMI_RX_PLL_CALREFSEL_REG, 0x03);
+ /* VCO Cal */
+ hdmi_writeb(ctx, HDMI_RX_PLL_VCOCAL_REG, 0x20);
+ /* Auto EQ */
+ hdmi_writeb(ctx, HDMI_RX_EQ_DATA0_REG, 0x8A);
+ /* Auto EQ */
+ hdmi_writeb(ctx, HDMI_RX_EQ_DATA1_REG, 0x6A);
+ /* Auto EQ */
+ hdmi_writeb(ctx, HDMI_RX_EQ_DATA2_REG, 0xAA);
+ /* Auto EQ */
+ hdmi_writeb(ctx, HDMI_RX_EQ_DATA3_REG, 0xCA);
+ /* Auto EQ */
+ hdmi_writeb(ctx, HDMI_RX_EQ_DATA4_REG, 0xEA);
+ /* Manual zone */
+ hdmi_writeb(ctx, HDMI_RX_TMDS_ZONE_CTRL_REG, 0xA0);
+ /* PLL Mode Value */
+ hdmi_writeb(ctx, HDMI_RX_TMDS_MODE_CTRL_REG, 0x00);
+ mhl_tx_writeb(ctx, MHL_TX_TMDS_CCTRL, 0x34);
+ hdmi_writeb(ctx, 0x45, 0x44);
+ /* Rx PLL BW ~ 4MHz */
+ hdmi_writeb(ctx, 0x31, 0x0A);
+ /* Analog PLL Control * bits 5:4 = 2b00 as per char. team. */
+ 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);
+ /* set bit 2 and 3, which is Initiator Timeout */
+ cbus_writebm(ctx, CBUS_LINK_CONTROL_2_REG, ~0, 0x0C);
+ 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 importand before megsure 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);
+ /*end of this */
+
+ /* 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;
+}
+
+#define sii9234_hw_on(sii9234) \
+ regulator_enable((sii9234)->vcc_supply)
+
+static void sii9234_hw_off(struct sii9234 *ctx)
+{
+ gpiod_set_value(ctx->gpio_reset, 0);
+ usleep_range(10000, 20000);
+ gpiod_set_value(ctx->gpio_reset, 1);
+ regulator_disable(ctx->vcc_supply);
+ gpiod_set_value(ctx->gpio_reset, 0);
+}
+
+static void sii9234_hw_reset(struct sii9234 *ctx)
+{
+ gpiod_set_value(ctx->gpio_reset, 0);
+ usleep_range(10000, 20000);
+ gpiod_set_value(ctx->gpio_reset, 1);
+}
+
+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);
+ 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");
+ /* After applying RGND patch, there is some issue
+ * about discovry failure
+ * This point is add to fix that problem
+ */
+ 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;
+
+ usleep_range(T_SRC_VBUS_CBUS_TO_STABLE * USEC_PER_MSEC,
+ T_SRC_VBUS_CBUS_TO_STABLE * USEC_PER_MSEC);
+
+ 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) {
+ dev_info(ctx->dev, "HPD High\n");
+ /* Downstream HPD High, Enable TMDS */
+ sii9234_tmds_control(ctx, true);
+ /*turn on&off hpd festure for only QCT HDMI */
+ } else {
+ dev_info(ctx->dev, "HPD Low\n");
+ /* 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 worng 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_info(ctx->dev, "MHL cable connected.. RSEN High\n");
+ return ST_RSEN_HIGH;
+ }
+ dev_info(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_info(ctx->dev, "RSEN recovery\n");
+ return ST_RSEN_HIGH;
+ }
+ dev_info(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__);
+
+ msleep(30);
+
+ 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_info(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 = to_i2c_adapter(client->dev.parent);
+
+ 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_HIGH);
+ 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->vcc_supply = devm_regulator_get(ctx->dev, "vcc");
+ if (IS_ERR(ctx->vcc_supply)) {
+ dev_err(ctx->dev, "failed to acquire regulator vcc\n");
+ return PTR_ERR(ctx->vcc_supply);
+ }
+
+ ctx->client[I2C_MHL] = client;
+
+ ctx->client[I2C_TPI] = i2c_new_dummy(adapter, 0x7A >> 1);
+ if (!ctx->client[I2C_TPI]) {
+ dev_err(ctx->dev, "failed to create TPI client\n");
+ return -ENODEV;
+ }
+
+ ctx->client[I2C_HDMI] = i2c_new_dummy(adapter, 0x92 >> 1);
+ if (!ctx->client[I2C_HDMI]) {
+ dev_err(ctx->dev, "failed to create HDMI RX client\n");
+ goto fail_tpi;
+ }
+
+ ctx->client[I2C_CBUS] = i2c_new_dummy(adapter, 0xC8 >> 1);
+ if (!ctx->client[I2C_CBUS]) {
+ dev_err(ctx->dev, "failed to create CBUS client\n");
+ goto fail_hdmi;
+ }
+
+ return 0;
+
+fail_hdmi:
+ i2c_unregister_device(ctx->client[I2C_HDMI]);
+fail_tpi:
+ i2c_unregister_device(ctx->client[I2C_TPI]);
+
+ return -ENODEV;
+}
+
+static void sii9234_deinit_resources(struct sii9234 *ctx)
+{
+ i2c_unregister_device(ctx->client[I2C_CBUS]);
+ i2c_unregister_device(ctx->client[I2C_HDMI]);
+ i2c_unregister_device(ctx->client[I2C_TPI]);
+}
+
+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_mode *mode)
+{
+ struct sii9234 *ctx = bridge_to_sii9234(bridge);
+
+ 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_mhl_tx_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ 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;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
+ dev_err(dev, "I2C adapter lacks SMBUS feature\n");
+ return -EIO;
+ }
+
+ mutex_init(&ctx->lock);
+
+ ret = sii9234_init_resources(ctx, client);
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to initialize sii9234 resources\n");
+ return ret;
+ }
+ ret = sii9234_hw_on(ctx);
+ if (ret) {
+ dev_err(&client->dev, "failed to enable power\n");
+ goto err_resource;
+ }
+ sii9234_hw_reset(ctx);
+
+ 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;
+ }
+
+ 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;
+
+err_resource:
+ sii9234_deinit_resources(ctx);
+
+ return ret;
+}
+
+static int sii9234_mhl_tx_i2c_remove(struct i2c_client *client)
+{
+ struct sii9234 *ctx = i2c_get_clientdata(client);
+
+ sii9234_cable_out(ctx);
+ drm_bridge_remove(&ctx->bridge);
+ sii9234_deinit_resources(ctx);
+
+ 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",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(sii9234_dt_match),
+ },
+ .probe = sii9234_mhl_tx_i2c_probe,
+ .remove = sii9234_mhl_tx_i2c_remove,
+ .id_table = sii9234_id,
+};
+
+module_i2c_driver(sii9234_driver);
+MODULE_LICENSE("GPL");
--
2.7.4
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