[PATCH v2 3/4] drm: bridge: add it66121 driver

Phong LE
2020-03-11T12:51:55Z

This commit is a simple driver for bridge HMDI it66121.
The input format is RBG and there is no color conversion.
Audio, HDCP and CEC are not supported yet.

Signed-off-by: Phong LE <ple@baylibre.com>
---
drivers/gpu/drm/bridge/Kconfig | 8 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/ite-it66121.c | 997 +++++++++++++++++++++++++++
3 files changed, 1006 insertions(+)
create mode 100644 drivers/gpu/drm/bridge/ite-it66121.c

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index aaed2347ace9..ae57b83f47c8 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -38,6 +38,14 @@ config DRM_DISPLAY_CONNECTOR
on ARM-based platforms. Saying Y here when this driver is not needed
will not cause any issue.

+config DRM_ITE_IT66121
+ tristate "ITE IT66121 HDMI bridge"
+ depends on OF
+ select DRM_KMS_HELPER
+ select REGMAP_I2C
+ help
+ Support for ITE IT66121 HDMI bridge.
+
config DRM_LVDS_CODEC
tristate "Transparent LVDS encoders and decoders support"
depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 6fb062b5b0f0..9fe80e820f64 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o
+obj-$(CONFIG_DRM_ITE_IT66121) += ite-it66121.o
obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
new file mode 100644
index 000000000000..7e1a90319a6a
--- /dev/null
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -0,0 +1,997 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 BayLibre, SAS
+ * Author: Phong LE <ple@baylibre.com>
+ * Copyright (C) 2018-2019, Artem Mygaiev
+ * Copyright (C) 2017, Fresco Logic, Incorporated.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+#define IT66121_MASTER_SEL_REG 0x10
+#define IT66121_MASTER_SEL_HOST BIT(0)
+
+#define IT66121_AFE_DRV_REG 0x61
+#define IT66121_AFE_DRV_RST BIT(4)
+#define IT66121_AFE_DRV_PWD BIT(5)
+
+#define IT66121_INPUT_MODE_REG 0x70
+#define IT66121_INPUT_MODE_RGB (0 << 6)
+#define IT66121_INPUT_MODE_YUV422 BIT(6)
+#define IT66121_INPUT_MODE_YUV444 (2 << 6)
+#define IT66121_INPUT_MODE_CCIR656 BIT(4)
+#define IT66121_INPUT_MODE_SYNCEMB BIT(3)
+#define IT66121_INPUT_MODE_DDR BIT(2)
+
+#define IT66121_INPUT_CSC_REG 0x72
+#define IT66121_INPUT_CSC_ENDITHER BIT(7)
+#define IT66121_INPUT_CSC_ENUDFILTER BIT(6)
+#define IT66121_INPUT_CSC_DNFREE_GO BIT(5)
+#define IT66121_INPUT_CSC_RGB_TO_YUV 0x02
+#define IT66121_INPUT_CSC_YUV_TO_RGB 0x03
+#define IT66121_INPUT_CSC_NO_CONV 0x00
+
+#define IT66121_AFE_XP_REG 0x62
+#define IT66121_AFE_XP_GAINBIT BIT(7)
+#define IT66121_AFE_XP_PWDPLL BIT(6)
+#define IT66121_AFE_XP_ENI BIT(5)
+#define IT66121_AFE_XP_ENO BIT(4)
+#define IT66121_AFE_XP_RESETB BIT(3)
+#define IT66121_AFE_XP_PWDI BIT(2)
+
+#define IT66121_AFE_IP_REG 0x64
+#define IT66121_AFE_IP_GAINBIT BIT(7)
+#define IT66121_AFE_IP_PWDPLL BIT(6)
+#define IT66121_AFE_IP_CKSEL_05 (0 << 4)
+#define IT66121_AFE_IP_CKSEL_1 BIT(4)
+#define IT66121_AFE_IP_CKSEL_2 (2 << 4)
+#define IT66121_AFE_IP_CKSEL_2OR4 (3 << 4)
+#define IT66121_AFE_IP_ER0 BIT(3)
+#define IT66121_AFE_IP_RESETB BIT(2)
+#define IT66121_AFE_IP_ENC BIT(1)
+#define IT66121_AFE_IP_EC1 BIT(0)
+
+#define IT66121_AFE_XP_EC1_REG 0x68
+#define IT66121_AFE_XP_EC1_LOWCLK BIT(4)
+
+#define IT66121_SW_RST_REG 0x04
+#define IT66121_SW_RST_REF BIT(5)
+#define IT66121_SW_RST_AREF BIT(4)
+#define IT66121_SW_RST_VID BIT(3)
+#define IT66121_SW_RST_AUD BIT(2)
+#define IT66121_SW_RST_HDCP BIT(0)
+
+#define IT66121_DDC_COMMAND_REG 0x15
+#define IT66121_DDC_COMMAND_BURST_READ 0x0
+#define IT66121_DDC_COMMAND_EDID_READ 0x3
+#define IT66121_DDC_COMMAND_FIFO_CLR 0x9
+#define IT66121_DDC_COMMAND_SCL_PULSE 0xA
+#define IT66121_DDC_COMMAND_ABORT 0xF
+
+#define IT66121_HDCP_REG 0x20
+#define IT66121_HDCP_CPDESIRED BIT(0)
+#define IT66121_HDCP_EN1P1FEAT BIT(1)
+
+#define IT66121_INT_STATUS1_REG 0x06
+#define IT66121_INT_STATUS1_AUD_OVF BIT(7)
+#define IT66121_INT_STATUS1_DDC_NOACK BIT(5)
+#define IT66121_INT_STATUS1_DDC_FIFOERR BIT(4)
+#define IT66121_INT_STATUS1_DDC_BUSHANG BIT(2)
+#define IT66121_INT_STATUS1_RX_SENS_STATUS BIT(1)
+#define IT66121_INT_STATUS1_HPD_STATUS BIT(0)
+
+#define IT66121_DDC_HEADER_REG 0x11
+#define IT66121_DDC_HEADER_HDCP 0x74
+#define IT66121_DDC_HEADER_EDID 0xA0
+
+#define IT66121_DDC_OFFSET_REG 0x12
+#define IT66121_DDC_BYTE_REG 0x13
+#define IT66121_DDC_SEGMENT_REG 0x14
+#define IT66121_DDC_RD_FIFO_REG 0x17
+
+#define IT66121_CLK_BANK_REG 0x0F
+#define IT66121_CLK_BANK_PWROFF_RCLK BIT(6)
+#define IT66121_CLK_BANK_PWROFF_ACLK BIT(5)
+#define IT66121_CLK_BANK_PWROFF_TXCLK BIT(4)
+#define IT66121_CLK_BANK_PWROFF_CRCLK BIT(3)
+#define IT66121_CLK_BANK_0 0
+#define IT66121_CLK_BANK_1 1
+
+#define IT66121_INT_REG 0x05
+#define IT66121_INT_ACTIVE_HIGH BIT(7)
+#define IT66121_INT_OPEN_DRAIN BIT(6)
+#define IT66121_INT_TX_CLK_OFF BIT(0)
+
+#define IT66121_INT_MASK1_REG 0x09
+#define IT66121_INT_MASK1_AUD_OVF BIT(7)
+#define IT66121_INT_MASK1_DDC_NOACK BIT(5)
+#define IT66121_INT_MASK1_DDC_FIFOERR BIT(4)
+#define IT66121_INT_MASK1_DDC_BUSHANG BIT(2)
+#define IT66121_INT_MASK1_RX_SENS BIT(1)
+#define IT66121_INT_MASK1_HPD BIT(0)
+
+#define IT66121_INT_CLR1_REG 0x0C
+#define IT66121_INT_CLR1_PKTACP BIT(7)
+#define IT66121_INT_CLR1_PKTNULL BIT(6)
+#define IT66121_INT_CLR1_PKTGEN BIT(5)
+#define IT66121_INT_CLR1_KSVLISTCHK BIT(4)
+#define IT66121_INT_CLR1_AUTHDONE BIT(3)
+#define IT66121_INT_CLR1_AUTHFAIL BIT(2)
+#define IT66121_INT_CLR1_RX_SENS BIT(1)
+#define IT66121_INT_CLR1_HPD BIT(0)
+
+#define IT66121_AV_MUTE_REG 0xC1
+#define IT66121_AV_MUTE_ON BIT(0)
+#define IT66121_AV_MUTE_BLUESCR BIT(1)
+
+#define IT66121_PKT_GEN_CTRL_REG 0xC6
+#define IT66121_PKT_GEN_CTRL_ON BIT(0)
+#define IT66121_PKT_GEN_CTRL_RPT BIT(1)
+
+#define IT66121_AVIINFO_DB1_REG 0x158
+#define IT66121_AVIINFO_DB2_REG 0x159
+#define IT66121_AVIINFO_DB3_REG 0x15A
+#define IT66121_AVIINFO_DB4_REG 0x15B
+#define IT66121_AVIINFO_DB5_REG 0x15C
+#define IT66121_AVIINFO_CSUM_REG 0x15D
+#define IT66121_AVIINFO_DB6_REG 0x15E
+#define IT66121_AVIINFO_DB7_REG 0x15F
+#define IT66121_AVIINFO_DB8_REG 0x160
+#define IT66121_AVIINFO_DB9_REG 0x161
+#define IT66121_AVIINFO_DB10_REG 0x162
+#define IT66121_AVIINFO_DB11_REG 0x163
+#define IT66121_AVIINFO_DB12_REG 0x164
+#define IT66121_AVIINFO_DB13_REG 0x165
+
+#define IT66121_AVI_INFO_PKT_REG 0xCD
+#define IT66121_AVI_INFO_PKT_ON BIT(0)
+#define IT66121_AVI_INFO_PKT_RPT BIT(1)
+
+#define IT66121_HDMI_MODE_REG 0xC0
+#define IT66121_HDMI_MODE_HDMI BIT(0)
+
+#define IT66121_SYS_STATUS_REG 0x0E
+#define IT66121_SYS_STATUS_ACTIVE_IRQ BIT(7)
+#define IT66121_SYS_STATUS_HPDETECT BIT(6)
+#define IT66121_SYS_STATUS_SENDECTECT BIT(5)
+#define IT66121_SYS_STATUS_VID_STABLE BIT(4)
+#define IT66121_SYS_STATUS_AUD_CTS_CLR BIT(1)
+#define IT66121_SYS_STATUS_CLEAR_IRQ BIT(0)
+
+#define IT66121_DDC_STATUS_REG 0x16
+#define IT66121_DDC_STATUS_TX_DONE BIT(7)
+#define IT66121_DDC_STATUS_ACTIVE BIT(6)
+#define IT66121_DDC_STATUS_NOACK BIT(5)
+#define IT66121_DDC_STATUS_WAIT_BUS BIT(4)
+#define IT66121_DDC_STATUS_ARBI_LOSE BIT(3)
+#define IT66121_DDC_STATUS_FIFO_FULL BIT(2)
+#define IT66121_DDC_STATUS_FIFO_EMPTY BIT(1)
+#define IT66121_DDC_STATUS_FIFO_VALID BIT(0)
+
+#define IT66121_VENDOR_ID0 0x54
+#define IT66121_VENDOR_ID1 0x49
+#define IT66121_DEVICE_ID0 0x12
+#define IT66121_DEVICE_ID1 0x06
+#define IT66121_DEVICE_MASK 0x0F
+#define IT66121_EDID_SLEEP 20000
+#define IT66121_EDID_TIMEOUT 200000
+#define IT66121_EDID_FIFO_SIZE 32
+#define IT66121_AFE_CLK_HIGH 80000
+
+struct it66121_conf {
+ unsigned int input_mode_reg;
+ unsigned int input_conversion_reg;
+};
+
+struct it66121_ctx {
+ struct regmap *regmap;
+ struct drm_bridge bridge;
+ struct drm_connector connector;
+ struct device *dev;
+ struct gpio_desc *gpio_reset;
+ struct i2c_client *client;
+ struct regulator_bulk_data supplies[3];
+ bool dual_edge;
+ const struct it66121_conf *conf;
+ struct mutex lock; /* Protects fields below and device registers */
+ struct edid *edid;
+ struct hdmi_avi_infoframe hdmi_avi_infoframe;
+};
+
+static const struct regmap_range_cfg it66121_regmap_banks[] = {
+ {
+ .name = "it66121",
+ .range_min = 0x00,
+ .range_max = 0x1FF,
+ .selector_reg = IT66121_CLK_BANK_REG,
+ .selector_mask = 0x1,
+ .selector_shift = 0,
+ .window_start = 0x00,
+ .window_len = 0x130,
+ },
+};
+
+static const struct regmap_config it66121_regmap_config = {
+ .val_bits = 8,
+ .reg_bits = 8,
+ .max_register = 0x1FF,
+ .ranges = it66121_regmap_banks,
+ .num_ranges = ARRAY_SIZE(it66121_regmap_banks),
+};
+
+static const struct it66121_conf it66121_conf_simple = {
+ .input_mode_reg = IT66121_INPUT_MODE_RGB | IT66121_INPUT_MODE_DDR,
+ .input_conversion_reg = IT66121_INPUT_CSC_NO_CONV,
+};
+
+static void it66121_hw_reset(struct it66121_ctx *ctx)
+{
+ gpiod_set_value(ctx->gpio_reset, 1);
+ msleep(20);
+ gpiod_set_value(ctx->gpio_reset, 0);
+}
+
+static int ite66121_power_on(struct it66121_ctx *ctx)
+{
+ return regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+}
+
+static int ite66121_power_off(struct it66121_ctx *ctx)
+{
+ return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+}
+
+static int it66121_preamble_ddc(struct it66121_ctx *ctx)
+{
+ return regmap_write(ctx->regmap, IT66121_MASTER_SEL_REG,
+ IT66121_MASTER_SEL_HOST);
+}
+
+static int it66121_fire_afe(struct it66121_ctx *ctx)
+{
+ return regmap_write(ctx->regmap, IT66121_AFE_DRV_REG, 0);
+}
+
+static int it66121_configure_input(struct it66121_ctx *ctx)
+{
+ int ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_INPUT_MODE_REG,
+ ctx->conf->input_mode_reg);
+ if (ret)
+ return ret;
+
+ return regmap_write(ctx->regmap, IT66121_INPUT_CSC_REG,
+ ctx->conf->input_conversion_reg);
+}
+
+/**
+ * it66121_configure_afe() - Configure the analog front end
+ * @ctx: it66121_ctx object
+ *
+ * RETURNS:
+ * zero if success, a negative error code otherwise.
+ */
+static int it66121_configure_afe(struct it66121_ctx *ctx,
+ const struct drm_display_mode *mode)
+{
+ int ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_AFE_DRV_REG,
+ IT66121_AFE_DRV_RST);
+ if (ret)
+ return ret;
+
+ if (mode->clock > IT66121_AFE_CLK_HIGH) {
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_REG,
+ IT66121_AFE_XP_GAINBIT |
+ IT66121_AFE_XP_ENO,
+ IT66121_AFE_XP_GAINBIT);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
+ IT66121_AFE_IP_GAINBIT |
+ IT66121_AFE_IP_ER0 |
+ IT66121_AFE_IP_EC1,
+ IT66121_AFE_IP_GAINBIT);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_EC1_REG,
+ IT66121_AFE_XP_EC1_LOWCLK, 0x80);
+ if (ret)
+ return ret;
+ } else {
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_REG,
+ IT66121_AFE_XP_GAINBIT |
+ IT66121_AFE_XP_ENO,
+ IT66121_AFE_XP_ENO);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
+ IT66121_AFE_IP_GAINBIT |
+ IT66121_AFE_IP_ER0 |
+ IT66121_AFE_IP_EC1, IT66121_AFE_IP_ER0 |
+ IT66121_AFE_IP_EC1);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_EC1_REG,
+ IT66121_AFE_XP_EC1_LOWCLK,
+ IT66121_AFE_XP_EC1_LOWCLK);
+ if (ret)
+ return ret;
+ }
+
+ /* Clear reset flags */
+ ret = regmap_write_bits(ctx->regmap, IT66121_SW_RST_REG,
+ IT66121_SW_RST_REF | IT66121_SW_RST_VID,
+ ~(IT66121_SW_RST_REF | IT66121_SW_RST_VID) &
+ 0xFF);
+ if (ret)
+ return ret;
+
+ return it66121_fire_afe(ctx);
+}
+
+static inline int it66121_wait_ddc_ready(struct it66121_ctx *ctx)
+{
+ int ret, val;
+
+ ret = regmap_read_poll_timeout(ctx->regmap, IT66121_DDC_STATUS_REG,
+ val, true,
+ IT66121_EDID_SLEEP,
+ IT66121_EDID_TIMEOUT);
+ if (ret)
+ return ret;
+
+ if (val & (IT66121_DDC_STATUS_NOACK | IT66121_DDC_STATUS_WAIT_BUS |
+ IT66121_DDC_STATUS_ARBI_LOSE))
+ return -EAGAIN;
+
+ return 0;
+}
+
+static int it66121_clear_ddc_fifo(struct it66121_ctx *ctx)
+{
+ int ret;
+
+ ret = it66121_preamble_ddc(ctx);
+ if (ret)
+ return ret;
+
+ return regmap_write(ctx->regmap, IT66121_DDC_COMMAND_REG,
+ IT66121_DDC_COMMAND_FIFO_CLR);
+}
+
+static int it66121_abort_ddc_ops(struct it66121_ctx *ctx)
+{
+ int ret;
+ unsigned int swreset, cpdesire;
+
+ ret = regmap_read(ctx->regmap, IT66121_SW_RST_REG, &swreset);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(ctx->regmap, IT66121_HDCP_REG, &cpdesire);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_HDCP_REG,
+ cpdesire & (~IT66121_HDCP_CPDESIRED & 0xFF));
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_SW_RST_REG,
+ swreset | IT66121_SW_RST_HDCP);
+ if (ret)
+ return ret;
+
+ ret = it66121_preamble_ddc(ctx);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_DDC_COMMAND_REG,
+ IT66121_DDC_COMMAND_ABORT);
+ if (ret)
+ return ret;
+
+ return it66121_wait_ddc_ready(ctx);
+}
+
+static int it66121_get_edid_block(void *context, u8 *buf,
+ unsigned int block, size_t len)
+{
+ struct it66121_ctx *ctx = context;
+ unsigned int val;
+ int remain = len;
+ int offset = 0;
+ int ret, cnt;
+
+ offset = (block % 2) * len;
+ block = block / 2;
+
+ ret = regmap_read(ctx->regmap, IT66121_INT_STATUS1_REG, &val);
+ if (ret)
+ return ret;
+
+ if (val & IT66121_INT_STATUS1_DDC_BUSHANG) {
+ ret = it66121_abort_ddc_ops(ctx);
+ if (ret)
+ return ret;
+ }
+
+ ret = it66121_clear_ddc_fifo(ctx);
+ if (ret)
+ return ret;
+
+ while (remain > 0) {
+ cnt = (remain > IT66121_EDID_FIFO_SIZE) ?
+ IT66121_EDID_FIFO_SIZE : remain;
+ ret = it66121_preamble_ddc(ctx);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_DDC_COMMAND_REG,
+ IT66121_DDC_COMMAND_FIFO_CLR);
+ if (ret)
+ return ret;
+
+ ret = it66121_wait_ddc_ready(ctx);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(ctx->regmap, IT66121_INT_STATUS1_REG, &val);
+ if (ret)
+ return ret;
+
+ if (val & IT66121_INT_STATUS1_DDC_BUSHANG) {
+ ret = it66121_abort_ddc_ops(ctx);
+ if (ret)
+ return ret;
+ }
+
+ ret = it66121_preamble_ddc(ctx);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_DDC_HEADER_REG,
+ IT66121_DDC_HEADER_EDID);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_DDC_OFFSET_REG, offset);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_DDC_BYTE_REG, cnt);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_DDC_SEGMENT_REG, block);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(ctx->regmap, IT66121_DDC_COMMAND_REG,
+ IT66121_DDC_COMMAND_EDID_READ);
+ if (ret)
+ return ret;
+
+ offset += cnt;
+ remain -= cnt;
+ msleep(20);
+
+ ret = it66121_wait_ddc_ready(ctx);
+ if (ret)
+ return ret;
+
+ do {
+ ret = regmap_read(ctx->regmap,
+ IT66121_DDC_RD_FIFO_REG, &val);
+ if (ret)
+ return ret;
+ *(buf++) = val;
+ cnt--;
+ } while (cnt > 0);
+ }
+
+ return 0;
+}
+
+static int it66121_connector_get_modes(struct drm_connector *connector)
+{
+ int ret, num_modes = 0;
+ struct it66121_ctx *ctx = container_of(connector, struct it66121_ctx,
+ connector);
+
+ if (ctx->edid)
+ return drm_add_edid_modes(connector, ctx->edid);
+
+ mutex_lock(&ctx->lock);
+
+ ctx->edid = drm_do_get_edid(connector, it66121_get_edid_block, ctx);
+ if (!ctx->edid) {
+ DRM_ERROR("Failed to read EDID\n");
+ goto unlock;
+ }
+
+ ret = drm_connector_update_edid_property(connector,
+ ctx->edid);
+ if (ret) {
+ DRM_ERROR("Failed to update EDID property: %d\n", ret);
+ goto unlock;
+ }
+
+ num_modes = drm_add_edid_modes(connector, ctx->edid);
+
+unlock:
+ mutex_unlock(&ctx->lock);
+
+ return num_modes;
+}
+
+static bool it66121_is_hpd_detect(struct it66121_ctx *ctx)
+{
+ int val;
+
+ if (regmap_read(ctx->regmap, IT66121_SYS_STATUS_REG, &val))
+ return false;
+
+ return (val & IT66121_SYS_STATUS_HPDETECT);
+}
+
+static int it66121_connector_detect_ctx(struct drm_connector *connector,
+ struct drm_modeset_acquire_ctx *c,
+ bool force)
+{
+ struct it66121_ctx *ctx = container_of(connector, struct it66121_ctx,
+ connector);
+
+ return (it66121_is_hpd_detect(ctx)) ?
+ connector_status_connected : connector_status_disconnected;
+}
+
+static enum drm_mode_status
+it66121_connector_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ unsigned long max_clock;
+ struct it66121_ctx *ctx = container_of(connector, struct it66121_ctx,
+ connector);
+
+ max_clock = ctx->dual_edge ? 74250 : 148500;
+
+ if (mode->clock > max_clock)
+ return MODE_CLOCK_HIGH;
+
+ if (mode->clock < 25000)
+ return MODE_CLOCK_LOW;
+
+ return MODE_OK;
+}
+
+static struct drm_connector_helper_funcs it66121_connector_helper_funcs = {
+ .get_modes = it66121_connector_get_modes,
+ .detect_ctx = it66121_connector_detect_ctx,
+ .mode_valid = it66121_connector_mode_valid,
+};
+
+static const struct drm_connector_funcs it66121_connector_funcs = {
+ .reset = drm_atomic_helper_connector_reset,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = drm_connector_cleanup,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int it66121_bridge_attach(struct drm_bridge *bridge,
+ enum drm_bridge_attach_flags flags)
+{
+ int ret;
+ struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx,
+ bridge);
+
+ if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
+ DRM_ERROR("Fix bridge driver to make connector optional!");
+ return -EINVAL;
+ }
+
+ if (!bridge->encoder) {
+ DRM_ERROR("Parent encoder object not found");
+ return -ENODEV;
+ }
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
+ IT66121_CLK_BANK_PWROFF_RCLK, 0);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_INT_REG,
+ IT66121_INT_TX_CLK_OFF, 0);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_DRV_REG,
+ IT66121_AFE_DRV_PWD, 0);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_REG,
+ IT66121_AFE_XP_PWDI | IT66121_AFE_XP_PWDPLL, 0);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
+ IT66121_AFE_IP_PWDPLL, 0);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_DRV_REG,
+ IT66121_AFE_DRV_RST, 0);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_REG,
+ IT66121_AFE_XP_RESETB, IT66121_AFE_XP_RESETB);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
+ IT66121_AFE_IP_RESETB, IT66121_AFE_IP_RESETB);
+ if (ret)
+ return ret;
+
+ ret = regmap_write_bits(ctx->regmap, IT66121_SW_RST_REG,
+ IT66121_SW_RST_REF,
+ IT66121_SW_RST_REF);
+ if (ret)
+ return ret;
+
+ msleep(50);
+
+ ret = drm_connector_init(bridge->dev, &ctx->connector,
+ &it66121_connector_funcs,
+ DRM_MODE_CONNECTOR_HDMIA);
+ if (ret)
+ return ret;
+
+ ctx->connector.polled = DRM_CONNECTOR_POLL_HPD;
+ drm_connector_helper_add(&ctx->connector,
+ &it66121_connector_helper_funcs);
+
+ ret = drm_connector_attach_encoder(&ctx->connector, bridge->encoder);
+ if (ret)
+ return ret;
+
+ ret = drm_connector_register(&ctx->connector);
+ if (ret)
+ return ret;
+
+ /* Start interrupts */
+ return regmap_write_bits(ctx->regmap, IT66121_INT_MASK1_REG,
+ IT66121_INT_MASK1_DDC_NOACK |
+ IT66121_INT_MASK1_HPD |
+ IT66121_INT_MASK1_DDC_FIFOERR |
+ IT66121_INT_MASK1_DDC_BUSHANG,
+ ~(IT66121_INT_MASK1_DDC_NOACK |
+ IT66121_INT_MASK1_HPD |
+ IT66121_INT_MASK1_DDC_FIFOERR |
+ IT66121_INT_MASK1_DDC_BUSHANG) & 0xFF);
+}
+
+static int it66121_set_mute(struct it66121_ctx *ctx, bool mute)
+{
+ int ret;
+ unsigned int val;
+
+ val = mute ? IT66121_AV_MUTE_ON : (~IT66121_AV_MUTE_ON & 0xFF);
+ ret = regmap_write_bits(ctx->regmap, IT66121_AV_MUTE_REG,
+ IT66121_AV_MUTE_ON, val);
+ if (ret)
+ return ret;
+
+ return regmap_write(ctx->regmap, IT66121_PKT_GEN_CTRL_REG,
+ IT66121_PKT_GEN_CTRL_ON |
+ IT66121_PKT_GEN_CTRL_RPT);
+}
+
+static void it66121_bridge_enable(struct drm_bridge *bridge)
+{
+ struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx,
+ bridge);
+
+ it66121_set_mute(ctx, false);
+}
+
+static void it66121_bridge_disable(struct drm_bridge *bridge)
+{
+ struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx,
+ bridge);
+
+ it66121_set_mute(ctx, true);
+}
+
+static
+void it66121_bridge_mode_set(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode,
+ const struct drm_display_mode *adjusted_mode)
+{
+ int ret, i;
+ u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
+ struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx,
+ bridge);
+ const u16 aviinfo_reg[HDMI_AVI_INFOFRAME_SIZE] = {
+ IT66121_AVIINFO_DB1_REG,
+ IT66121_AVIINFO_DB2_REG,
+ IT66121_AVIINFO_DB3_REG,
+ IT66121_AVIINFO_DB4_REG,
+ IT66121_AVIINFO_DB5_REG,
+ IT66121_AVIINFO_DB6_REG,
+ IT66121_AVIINFO_DB7_REG,
+ IT66121_AVIINFO_DB8_REG,
+ IT66121_AVIINFO_DB9_REG,
+ IT66121_AVIINFO_DB10_REG,
+ IT66121_AVIINFO_DB11_REG,
+ IT66121_AVIINFO_DB12_REG,
+ IT66121_AVIINFO_DB13_REG
+ };
+
+ mutex_lock(&ctx->lock);
+
+ hdmi_avi_infoframe_init(&ctx->hdmi_avi_infoframe);
+
+ ret = drm_hdmi_avi_infoframe_from_display_mode(&ctx->hdmi_avi_infoframe,
+ &ctx->connector,
+ adjusted_mode);
+ if (ret) {
+ DRM_ERROR("Failed to setup AVI infoframe: %d\n", ret);
+ goto unlock;
+ }
+
+ ret = hdmi_avi_infoframe_pack(&ctx->hdmi_avi_infoframe, buf,
+ sizeof(buf));
+ if (ret < 0) {
+ DRM_ERROR("Failed to pack infoframe: %d\n", ret);
+ goto unlock;
+ }
+
+ /* Write new AVI infoframe packet */
+ for (i = 0; i < HDMI_AVI_INFOFRAME_SIZE; i++) {
+ if (regmap_write(ctx->regmap, aviinfo_reg[i],
+ buf[i + HDMI_INFOFRAME_HEADER_SIZE]))
+ goto unlock;
+ }
+ if (regmap_write(ctx->regmap, IT66121_AVIINFO_CSUM_REG, buf[3]))
+ goto unlock;
+
+ /* Enable AVI infoframe */
+ if (regmap_write(ctx->regmap, IT66121_AVI_INFO_PKT_REG,
+ IT66121_AVI_INFO_PKT_ON |
+ IT66121_AVI_INFO_PKT_RPT))
+ goto unlock;
+
+ /* Set TX mode to HDMI */
+ if (regmap_write(ctx->regmap, IT66121_HDMI_MODE_REG,
+ IT66121_HDMI_MODE_HDMI))
+ goto unlock;
+
+ if (regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
+ IT66121_CLK_BANK_PWROFF_TXCLK,
+ IT66121_CLK_BANK_PWROFF_TXCLK))
+ goto unlock;
+
+ if (it66121_configure_input(ctx))
+ goto unlock;
+
+ if (it66121_configure_afe(ctx, adjusted_mode))
+ goto unlock;
+
+ regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
+ IT66121_CLK_BANK_PWROFF_TXCLK,
+ ~IT66121_CLK_BANK_PWROFF_TXCLK & 0xFF);
+
+unlock:
+ mutex_unlock(&ctx->lock);
+}
+
+static const struct drm_bridge_funcs it66121_bridge_funcs = {
+ .attach = it66121_bridge_attach,
+ .enable = it66121_bridge_enable,
+ .disable = it66121_bridge_disable,
+ .mode_set = it66121_bridge_mode_set,
+};
+
+static irqreturn_t it66121_irq_threaded_handler(int irq, void *dev_id)
+{
+ int ret;
+ unsigned int val;
+ struct it66121_ctx *ctx = dev_id;
+ struct device *dev = ctx->dev;
+ bool event = false;
+
+ mutex_lock(&ctx->lock);
+
+ ret = regmap_read(ctx->regmap, IT66121_SYS_STATUS_REG, &val);
+ if (ret)
+ goto unlock;
+
+ if (val & IT66121_SYS_STATUS_ACTIVE_IRQ) {
+ ret = regmap_read(ctx->regmap, IT66121_INT_STATUS1_REG, &val);
+ if (ret) {
+ dev_err(dev, "Cannot read STATUS1_REG %d\n", ret);
+ } else {
+ if (val & IT66121_INT_STATUS1_DDC_FIFOERR)
+ it66121_clear_ddc_fifo(ctx);
+ if (val & (IT66121_INT_STATUS1_DDC_BUSHANG |
+ IT66121_INT_STATUS1_DDC_NOACK))
+ it66121_abort_ddc_ops(ctx);
+ if (val & IT66121_INT_STATUS1_HPD_STATUS) {
+ regmap_write_bits(ctx->regmap,
+ IT66121_INT_CLR1_REG,
+ IT66121_INT_CLR1_HPD,
+ IT66121_INT_CLR1_HPD);
+
+ if (!it66121_is_hpd_detect(ctx)) {
+ kfree(ctx->edid);
+ ctx->edid = NULL;
+ }
+ event = true;
+ }
+ }
+
+ regmap_write_bits(ctx->regmap, IT66121_SYS_STATUS_REG,
+ IT66121_SYS_STATUS_CLEAR_IRQ,
+ IT66121_SYS_STATUS_CLEAR_IRQ);
+ }
+
+unlock:
+ mutex_unlock(&ctx->lock);
+
+ if (event)
+ drm_helper_hpd_irq_event(ctx->bridge.dev);
+
+ return IRQ_HANDLED;
+}
+
+static int it66121_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ u8 ids[4];
+ int i, ret;
+ struct it66121_ctx *ctx;
+ struct device *dev = &client->dev;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(dev, "I2C check functionality failed.\n");
+ return -ENXIO;
+ }
+
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->dev = dev;
+ ctx->client = client;
+ i2c_set_clientdata(client, ctx);
+ mutex_init(&ctx->lock);
+ ctx->conf = (struct it66121_conf *)of_device_get_match_data(dev);
+ if (!ctx->conf)
+ return -ENODEV;
+
+ ctx->supplies[0].supply = "vcn33";
+ ctx->supplies[1].supply = "vcn18";
+ ctx->supplies[2].supply = "vrf12";
+ ret = devm_regulator_bulk_get(ctx->dev, 3, ctx->supplies);
+ if (ret) {
+ dev_err(ctx->dev, "regulator_bulk failed\n");
+ return ret;
+ }
+
+ ctx->dual_edge = of_property_read_bool(dev->of_node, "pclk-dual-edge");
+
+ ret = ite66121_power_on(ctx);
+ if (ret)
+ return ret;
+
+ it66121_hw_reset(ctx);
+
+ ctx->regmap = devm_regmap_init_i2c(client, &it66121_regmap_config);
+ if (IS_ERR(ctx->regmap)) {
+ ite66121_power_off(ctx);
+ return PTR_ERR(ctx);
+ }
+
+ for (i = 0; i < 4; i++) {
+ regmap_read(ctx->regmap, i, &ret);
+ ids[i] = ret;
+ }
+
+ if (ids[0] != IT66121_VENDOR_ID0 ||
+ ids[1] != IT66121_VENDOR_ID1 ||
+ ids[2] != IT66121_DEVICE_ID0 ||
+ ((ids[3] & IT66121_DEVICE_MASK) != IT66121_DEVICE_ID1)) {
+ ite66121_power_off(ctx);
+ return -ENODEV;
+ }
+
+ ctx->bridge.funcs = &it66121_bridge_funcs;
+ ctx->bridge.of_node = dev->of_node;
+
+ ret = devm_request_threaded_irq(dev, client->irq, NULL,
+ it66121_irq_threaded_handler,
+ IRQF_SHARED | IRQF_TRIGGER_LOW |
+ IRQF_ONESHOT,
+ dev_name(dev),
+ ctx);
+ if (ret < 0) {
+ dev_err(dev, "Failed to request irq %d:%d\n", client->irq, ret);
+ ite66121_power_off(ctx);
+ return ret;
+ }
+
+ drm_bridge_add(&ctx->bridge);
+
+ return 0;
+}
+
+static int it66121_remove(struct i2c_client *client)
+{
+ struct it66121_ctx *ctx = i2c_get_clientdata(client);
+
+ ite66121_power_off(ctx);
+ drm_bridge_remove(&ctx->bridge);
+ kfree(ctx->edid);
+ mutex_destroy(&ctx->lock);
+
+ return 0;
+}
+
+static const struct of_device_id it66121_dt_match[] = {
+ { .compatible = "ite,it66121",
+ .data = &it66121_conf_simple,
+ },
+ { },
+};
+MODULE_DEVICE_TABLE(of, it66121_dt_match);
+
+static const struct i2c_device_id it66121_id[] = {
+ { "it66121", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, it66121_id);
+
+static struct i2c_driver it66121_driver = {
+ .driver = {
+ .name = "it66121",
+ .of_match_table = it66121_dt_match,
+ },
+ .probe = it66121_probe,
+ .remove = it66121_remove,
+ .id_table = it66121_id,
+};
+
+module_i2c_driver(it66121_driver);
+
+MODULE_AUTHOR("Phong LE");
+MODULE_DESCRIPTION("IT66121 HDMI transmitter driver");
+MODULE_LICENSE("GPL v2");
--
2.17.1