[U-Boot] [PATCH v6 23/26] tegra: video: Add Embedded DisplayPort driver

Simon Glass
2015-04-15T03:03:41Z

This interface is used on laptop devices based on Tegra. Add a driver which
provides access to the eDP interface. The driver uses the display port
uclass.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

Changes in v6:
- Fix incorrect use of DP_MAIN_LINK_CHANNEL_CODING_SET register

Changes in v4: None
Changes in v3:
- Fix 64-bit maths error
- Fix trainging typo
- Set scramble_ena to 1 on start-up so that link training succeeds
- Use real error return values in tegra_dc_dpaux_write_chunk() and others
- Use sor pointer in struct tegra_dp_priv

Changes in v2: None

drivers/video/tegra124/Makefile | 1 +
drivers/video/tegra124/displayport.h | 184 ++++++
drivers/video/tegra124/dp.c | 1080 ++++++++++++++++++++++++++++++++++
3 files changed, 1265 insertions(+)
create mode 100644 drivers/video/tegra124/displayport.h
create mode 100644 drivers/video/tegra124/dp.c

diff --git a/drivers/video/tegra124/Makefile b/drivers/video/tegra124/Makefile
index 9aa81a5..7e08ee9 100644
--- a/drivers/video/tegra124/Makefile
+++ b/drivers/video/tegra124/Makefile
@@ -4,4 +4,5 @@
# SPDX-License-Identifier: GPL-2.0+
#

+obj-y += dp.o
obj-y += sor.o
diff --git a/drivers/video/tegra124/displayport.h b/drivers/video/tegra124/displayport.h
new file mode 100644
index 0000000..c70bbe3
--- /dev/null
+++ b/drivers/video/tegra124/displayport.h
@@ -0,0 +1,184 @@
+/*
+ * Copyright (c) 2014, NVIDIA Corporation.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef _TEGRA_DISPLAYPORT_H
+#define _TEGRA_DISPLAYPORT_H
+
+#include <linux/drm_dp_helper.h>
+
+struct dpaux_ctlr {
+ u32 reserved0;
+ u32 intr_en_aux;
+ u32 reserved2_4;
+ u32 intr_aux;
+};
+
+#define DPAUX_INTR_EN_AUX 0x1
+#define DPAUX_INTR_AUX 0x5
+#define DPAUX_DP_AUXDATA_WRITE_W(i) (0x9 + 4 * (i))
+#define DPAUX_DP_AUXDATA_READ_W(i) (0x19 + 4 * (i))
+#define DPAUX_DP_AUXADDR 0x29
+#define DPAUX_DP_AUXCTL 0x2d
+#define DPAUX_DP_AUXCTL_CMDLEN_SHIFT 0
+#define DPAUX_DP_AUXCTL_CMDLEN_FIELD 0xff
+#define DPAUX_DP_AUXCTL_CMD_SHIFT 12
+#define DPAUX_DP_AUXCTL_CMD_MASK (0xf << 12)
+#define DPAUX_DP_AUXCTL_CMD_I2CWR (0 << 12)
+#define DPAUX_DP_AUXCTL_CMD_I2CRD (1 << 12)
+#define DPAUX_DP_AUXCTL_CMD_I2CREQWSTAT (2 << 12)
+#define DPAUX_DP_AUXCTL_CMD_MOTWR (4 << 12)
+#define DPAUX_DP_AUXCTL_CMD_MOTRD (5 << 12)
+#define DPAUX_DP_AUXCTL_CMD_MOTREQWSTAT (6 << 12)
+#define DPAUX_DP_AUXCTL_CMD_AUXWR (8 << 12)
+#define DPAUX_DP_AUXCTL_CMD_AUXRD (9 << 12)
+#define DPAUX_DP_AUXCTL_TRANSACTREQ_SHIFT 16
+#define DPAUX_DP_AUXCTL_TRANSACTREQ_MASK (0x1 << 16)
+#define DPAUX_DP_AUXCTL_TRANSACTREQ_DONE (0 << 16)
+#define DPAUX_DP_AUXCTL_TRANSACTREQ_PENDING (1 << 16)
+#define DPAUX_DP_AUXCTL_RST_SHIFT 31
+#define DPAUX_DP_AUXCTL_RST_DEASSERT (0 << 31)
+#define DPAUX_DP_AUXCTL_RST_ASSERT (1 << 31)
+#define DPAUX_DP_AUXSTAT 0x31
+#define DPAUX_DP_AUXSTAT_HPD_STATUS_SHIFT 28
+#define DPAUX_DP_AUXSTAT_HPD_STATUS_UNPLUG (0 << 28)
+#define DPAUX_DP_AUXSTAT_HPD_STATUS_PLUGGED (1 << 28)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_SHIFT 20
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_MASK (0xf << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_IDLE (0 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_SYNC (1 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_START1 (2 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_COMMAND (3 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_ADDRESS (4 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_LENGTH (5 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_WRITE1 (6 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_READ1 (7 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_GET_M (8 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_STOP1 (9 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_STOP2 (10 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_REPLY (11 << 20)
+#define DPAUX_DP_AUXSTAT_AUXCTL_STATE_CLEANUP (12 << 20)
+#define DPAUX_DP_AUXSTAT_REPLYTYPE_SHIFT 16
+#define DPAUX_DP_AUXSTAT_REPLYTYPE_MASK (0xf << 16)
+#define DPAUX_DP_AUXSTAT_REPLYTYPE_ACK (0 << 16)
+#define DPAUX_DP_AUXSTAT_REPLYTYPE_NACK (1 << 16)
+#define DPAUX_DP_AUXSTAT_REPLYTYPE_DEFER (2 << 16)
+#define DPAUX_DP_AUXSTAT_REPLYTYPE_I2CNACK (4 << 16)
+#define DPAUX_DP_AUXSTAT_REPLYTYPE_I2CDEFER (8 << 16)
+#define DPAUX_DP_AUXSTAT_NO_STOP_ERROR_SHIFT 11
+#define DPAUX_DP_AUXSTAT_NO_STOP_ERROR_NOT_PENDING (0 << 11)
+#define DPAUX_DP_AUXSTAT_NO_STOP_ERROR_PENDING (1 << 11)
+#define DPAUX_DP_AUXSTAT_SINKSTAT_ERROR_SHIFT 10
+#define DPAUX_DP_AUXSTAT_SINKSTAT_ERROR_NOT_PENDING (0 << 10)
+#define DPAUX_DP_AUXSTAT_SINKSTAT_ERROR_PENDING (1 << 10)
+#define DPAUX_DP_AUXSTAT_RX_ERROR_SHIFT 9
+#define DPAUX_DP_AUXSTAT_RX_ERROR_NOT_PENDING (0 << 9)
+#define DPAUX_DP_AUXSTAT_RX_ERROR_PENDING (1 << 9)
+#define DPAUX_DP_AUXSTAT_TIMEOUT_ERROR_SHIFT 8
+#define DPAUX_DP_AUXSTAT_TIMEOUT_ERROR_NOT_PENDING (0 << 8)
+#define DPAUX_DP_AUXSTAT_TIMEOUT_ERROR_PENDING (1 << 8)
+#define DPAUX_DP_AUXSTAT_REPLY_M_SHIFT 0
+#define DPAUX_DP_AUXSTAT_REPLY_M_MASK (0xff << 0)
+#define DPAUX_HPD_CONFIG (0x3d)
+#define DPAUX_HPD_IRQ_CONFIG 0x41
+#define DPAUX_DP_AUX_CONFIG 0x45
+#define DPAUX_HYBRID_PADCTL 0x49
+#define DPAUX_HYBRID_PADCTL_I2C_SDA_INPUT_RCV_SHIFT 15
+#define DPAUX_HYBRID_PADCTL_I2C_SDA_INPUT_RCV_DISABLE (0 << 15)
+#define DPAUX_HYBRID_PADCTL_I2C_SDA_INPUT_RCV_ENABLE (1 << 15)
+#define DPAUX_HYBRID_PADCTL_I2C_SCL_INPUT_RCV_SHIFT 14
+#define DPAUX_HYBRID_PADCTL_I2C_SCL_INPUT_RCV_DISABLE (0 << 14)
+#define DPAUX_HYBRID_PADCTL_I2C_SCL_INPUT_RCV_ENABLE (1 << 14)
+#define DPAUX_HYBRID_PADCTL_AUX_CMH_SHIFT 12
+#define DPAUX_HYBRID_PADCTL_AUX_CMH_DEFAULT_MASK (0x3 << 12)
+#define DPAUX_HYBRID_PADCTL_AUX_CMH_V0_60 (0 << 12)
+#define DPAUX_HYBRID_PADCTL_AUX_CMH_V0_64 (1 << 12)
+#define DPAUX_HYBRID_PADCTL_AUX_CMH_V0_70 (2 << 12)
+#define DPAUX_HYBRID_PADCTL_AUX_CMH_V0_56 (3 << 12)
+#define DPAUX_HYBRID_PADCTL_AUX_DRVZ_SHIFT 8
+#define DPAUX_HYBRID_PADCTL_AUX_DRVZ_DEFAULT_MASK (0x7 << 8)
+#define DPAUX_HYBRID_PADCTL_AUX_DRVZ_OHM_78 (0 << 8)
+#define DPAUX_HYBRID_PADCTL_AUX_DRVZ_OHM_60 (1 << 8)
+#define DPAUX_HYBRID_PADCTL_AUX_DRVZ_OHM_54 (2 << 8)
+#define DPAUX_HYBRID_PADCTL_AUX_DRVZ_OHM_45 (3 << 8)
+#define DPAUX_HYBRID_PADCTL_AUX_DRVZ_OHM_50 (4 << 8)
+#define DPAUX_HYBRID_PADCTL_AUX_DRVZ_OHM_42 (5 << 8)
+#define DPAUX_HYBRID_PADCTL_AUX_DRVZ_OHM_39 (6 << 8)
+#define DPAUX_HYBRID_PADCTL_AUX_DRVZ_OHM_34 (7 << 8)
+#define DPAUX_HYBRID_PADCTL_AUX_DRVI_SHIFT 2
+#define DPAUX_HYBRID_PADCTL_AUX_DRVI_DEFAULT_MASK (0x3f << 2)
+#define DPAUX_HYBRID_PADCTL_AUX_INPUT_RCV_SHIFT 1
+#define DPAUX_HYBRID_PADCTL_AUX_INPUT_RCV_DISABLE (0 << 1)
+#define DPAUX_HYBRID_PADCTL_AUX_INPUT_RCV_ENABLE (1 << 1)
+#define DPAUX_HYBRID_PADCTL_MODE_SHIFT 0
+#define DPAUX_HYBRID_PADCTL_MODE_AUX 0
+#define DPAUX_HYBRID_PADCTL_MODE_I2C 1
+#define DPAUX_HYBRID_SPARE 0x4d
+#define DPAUX_HYBRID_SPARE_PAD_PWR_POWERUP 0
+#define DPAUX_HYBRID_SPARE_PAD_PWR_POWERDOWN 1
+
+#define DP_AUX_DEFER_MAX_TRIES 7
+#define DP_AUX_TIMEOUT_MAX_TRIES 2
+#define DP_POWER_ON_MAX_TRIES 3
+
+#define DP_AUX_MAX_BYTES 16
+
+#define DP_AUX_TIMEOUT_MS 40
+#define DP_DPCP_RETRY_SLEEP_NS 400
+
+/* DPCD definitions which are not defined in drm_dp_helper.h */
+#define DP_DPCD_REV_MAJOR_SHIFT 4
+#define DP_DPCD_REV_MAJOR_MASK (0xf << 4)
+#define DP_DPCD_REV_MINOR_SHIFT 0
+#define DP_DPCD_REV_MINOR_MASK 0xf
+
+#define DP_MAX_LINK_RATE_VAL_1_62_GPBS 0x6
+#define DP_MAX_LINK_RATE_VAL_2_70_GPBS 0xa
+#define DP_MAX_LINK_RATE_VAL_5_40_GPBS 0x4
+
+#define DP_MAX_LANE_COUNT_LANE_1 0x1
+#define DP_MAX_LANE_COUNT_LANE_2 0x2
+#define DP_MAX_LANE_COUNT_LANE_4 0x4
+#define DP_MAX_LANE_COUNT_ENHANCED_FRAMING_YES (1 << 7)
+
+#define DP_MAX_DOWNSPREAD_VAL_NONE 0
+#define DP_MAX_DOWNSPREAD_VAL_0_5_PCT 1
+#define DP_MAX_DOWNSPREAD_NO_AUX_HANDSHAKE_LT_T (1 << 6)
+
+#define DP_EDP_CONFIGURATION_CAP_ASC_RESET_YES 1
+#define DP_EDP_CONFIGURATION_CAP_FRAMING_CHANGE_YES (1 << 1)
+
+#define DP_LANE_COUNT_SET_ENHANCEDFRAMING_T (1 << 7)
+
+#define DP_TRAINING_PATTERN_SET_SC_DISABLED_T (1 << 5)
+
+#define DP_MAIN_LINK_CHANNEL_CODING_SET_ASC_RESET_DISABLE 0
+#define DP_MAIN_LINK_CHANNEL_CODING_SET_ASC_RESET_ENABLE 1
+
+#define NV_DPCD_TRAINING_LANE0_1_SET2 0x10f
+#define NV_DPCD_TRAINING_LANE2_3_SET2 0x110
+#define NV_DPCD_LANEX_SET2_PC2_MAX_REACHED_T (1 << 2)
+#define NV_DPCD_LANEXPLUS1_SET2_PC2_MAX_REACHED_T (1 << 6)
+
+#define NV_DPCD_STATUS_LANEX_CR_DONE_SHIFT 0
+#define NV_DPCD_STATUS_LANEX_CR_DONE_NO (0x00000000)
+#define NV_DPCD_STATUS_LANEX_CR_DONE_YES (0x00000001)
+#define NV_DPCD_STATUS_LANEX_CHN_EQ_DONE_SHIFT 1
+#define NV_DPCD_STATUS_LANEX_CHN_EQ_DONE_NO (0x00000000 << 1)
+#define NV_DPCD_STATUS_LANEX_CHN_EQ_DONE_YES (0x00000001 << 1)
+#define NV_DPCD_STATUS_LANEX_SYMBOL_LOCKED_SHFIT 2
+#define NV_DPCD_STATUS_LANEX_SYMBOL_LOCKED_NO (0x00000000 << 2)
+#define NV_DPCD_STATUS_LANEX_SYMBOL_LOCKED_YES (0x00000001 << 2)
+#define NV_DPCD_STATUS_LANEXPLUS1_CR_DONE_SHIFT 4
+#define NV_DPCD_STATUS_LANEXPLUS1_CR_DONE_NO (0x00000000 << 4)
+#define NV_DPCD_STATUS_LANEXPLUS1_CR_DONE_YES (0x00000001 << 4)
+#define NV_DPCD_STATUS_LANEXPLUS1_CHN_EQ_DONE_SHIFT 5
+#define NV_DPCD_STATUS_LANEXPLUS1_CHN_EQ_DONE_NO (0x00000000 << 5)
+#define NV_DPCD_STATUS_LANEXPLUS1_CHN_EQ_DONE_YES (0x00000001 << 5)
+#define NV_DPCD_STATUS_LANEXPLUS1_SYMBOL_LOCKED_SHIFT 6
+#define NV_DPCD_STATUS_LANEXPLUS1_SYMBOL_LOCKED_NO (0x00000000 << 6)
+#define NV_DPCD_STATUS_LANEXPLUS1_SYMBOL_LOCKED_YES (0x00000001 << 6)
+
+#endif
diff --git a/drivers/video/tegra124/dp.c b/drivers/video/tegra124/dp.c
new file mode 100644
index 0000000..a318568
--- /dev/null
+++ b/drivers/video/tegra124/dp.c
@@ -0,0 +1,1080 @@
+/*
+ * Copyright (c) 2011-2013, NVIDIA Corporation.
+ * Copyright 2014 Google Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <displayport.h>
+#include <dm.h>
+#include <div64.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <asm/io.h>
+#include <asm/arch-tegra/dc.h>
+#include "displayport.h"
+#include "edid.h"
+#include "sor.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct tegra_dp_plat {
+ ulong base;
+};
+
+struct tegra_dp_priv {
+ struct dpaux_ctlr *regs;
+ struct tegra_dc_sor_data *sor;
+ u8 revision;
+ int enabled;
+};
+
+struct tegra_dp_priv dp_data;
+
+static inline u32 tegra_dpaux_readl(struct tegra_dp_priv *dp, u32 reg)
+{
+ return readl((u32 *)dp->regs + reg);
+}
+
+static inline void tegra_dpaux_writel(struct tegra_dp_priv *dp, u32 reg,
+ u32 val)
+{
+ writel(val, (u32 *)dp->regs + reg);
+}
+
+static inline u32 tegra_dc_dpaux_poll_register(struct tegra_dp_priv *dp,
+ u32 reg, u32 mask, u32 exp_val,
+ u32 poll_interval_us,
+ u32 timeout_us)
+{
+ u32 reg_val = 0;
+ u32 temp = timeout_us;
+
+ do {
+ udelay(poll_interval_us);
+ reg_val = tegra_dpaux_readl(dp, reg);
+ if (timeout_us > poll_interval_us)
+ timeout_us -= poll_interval_us;
+ else
+ break;
+ } while ((reg_val & mask) != exp_val);
+
+ if ((reg_val & mask) == exp_val)
+ return 0; /* success */
+ debug("dpaux_poll_register 0x%x: timeout: (reg_val)0x%08x & (mask)0x%08x != (exp_val)0x%08x\n",
+ reg, reg_val, mask, exp_val);
+ return temp;
+}
+
+static inline int tegra_dpaux_wait_transaction(struct tegra_dp_priv *dp)
+{
+ /* According to DP spec, each aux transaction needs to finish
+ within 40ms. */
+ if (tegra_dc_dpaux_poll_register(dp, DPAUX_DP_AUXCTL,
+ DPAUX_DP_AUXCTL_TRANSACTREQ_MASK,
+ DPAUX_DP_AUXCTL_TRANSACTREQ_DONE,
+ 100, DP_AUX_TIMEOUT_MS * 1000) != 0) {
+ debug("dp: DPAUX transaction timeout\n");
+ return -1;
+ }
+ return 0;
+}
+
+static int tegra_dc_dpaux_write_chunk(struct tegra_dp_priv *dp, u32 cmd,
+ u32 addr, u8 *data, u32 *size,
+ u32 *aux_stat)
+{
+ int i;
+ u32 reg_val;
+ u32 timeout_retries = DP_AUX_TIMEOUT_MAX_TRIES;
+ u32 defer_retries = DP_AUX_DEFER_MAX_TRIES;
+ u32 temp_data;
+
+ if (*size > DP_AUX_MAX_BYTES)
+ return -1; /* only write one chunk of data */
+
+ /* Make sure the command is write command */
+ switch (cmd) {
+ case DPAUX_DP_AUXCTL_CMD_I2CWR:
+ case DPAUX_DP_AUXCTL_CMD_MOTWR:
+ case DPAUX_DP_AUXCTL_CMD_AUXWR:
+ break;
+ default:
+ debug("dp: aux write cmd 0x%x is invalid\n", cmd);
+ return -EINVAL;
+ }
+
+ tegra_dpaux_writel(dp, DPAUX_DP_AUXADDR, addr);
+ for (i = 0; i < DP_AUX_MAX_BYTES / 4; ++i) {
+ memcpy(&temp_data, data, 4);
+ tegra_dpaux_writel(dp, DPAUX_DP_AUXDATA_WRITE_W(i), temp_data);
+ data += 4;
+ }
+
+ reg_val = tegra_dpaux_readl(dp, DPAUX_DP_AUXCTL);
+ reg_val &= ~DPAUX_DP_AUXCTL_CMD_MASK;
+ reg_val |= cmd;
+ reg_val &= ~DPAUX_DP_AUXCTL_CMDLEN_FIELD;
+ reg_val |= ((*size - 1) << DPAUX_DP_AUXCTL_CMDLEN_SHIFT);
+
+ while ((timeout_retries > 0) && (defer_retries > 0)) {
+ if ((timeout_retries != DP_AUX_TIMEOUT_MAX_TRIES) ||
+ (defer_retries != DP_AUX_DEFER_MAX_TRIES))
+ udelay(1);
+
+ reg_val |= DPAUX_DP_AUXCTL_TRANSACTREQ_PENDING;
+ tegra_dpaux_writel(dp, DPAUX_DP_AUXCTL, reg_val);
+
+ if (tegra_dpaux_wait_transaction(dp))
+ debug("dp: aux write transaction timeout\n");
+
+ *aux_stat = tegra_dpaux_readl(dp, DPAUX_DP_AUXSTAT);
+
+ if ((*aux_stat & DPAUX_DP_AUXSTAT_TIMEOUT_ERROR_PENDING) ||
+ (*aux_stat & DPAUX_DP_AUXSTAT_RX_ERROR_PENDING) ||
+ (*aux_stat & DPAUX_DP_AUXSTAT_SINKSTAT_ERROR_PENDING) ||
+ (*aux_stat & DPAUX_DP_AUXSTAT_NO_STOP_ERROR_PENDING)) {
+ if (timeout_retries-- > 0) {
+ debug("dp: aux write retry (0x%x) -- %d\n",
+ *aux_stat, timeout_retries);
+ /* clear the error bits */
+ tegra_dpaux_writel(dp, DPAUX_DP_AUXSTAT,
+ *aux_stat);
+ continue;
+ } else {
+ debug("dp: aux write got error (0x%x)\n",
+ *aux_stat);
+ return -ETIMEDOUT;
+ }
+ }
+
+ if ((*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_I2CDEFER) ||
+ (*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_DEFER)) {
+ if (defer_retries-- > 0) {
+ debug("dp: aux write defer (0x%x) -- %d\n",
+ *aux_stat, defer_retries);
+ /* clear the error bits */
+ tegra_dpaux_writel(dp, DPAUX_DP_AUXSTAT,
+ *aux_stat);
+ continue;
+ } else {
+ debug("dp: aux write defer exceeds max retries (0x%x)\n",
+ *aux_stat);
+ return -ETIMEDOUT;
+ }
+ }
+
+ if ((*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_MASK) ==
+ DPAUX_DP_AUXSTAT_REPLYTYPE_ACK) {
+ *size = ((*aux_stat) & DPAUX_DP_AUXSTAT_REPLY_M_MASK);
+ return 0;
+ } else {
+ debug("dp: aux write failed (0x%x)\n", *aux_stat);
+ return -EIO;
+ }
+ }
+ /* Should never come to here */
+ return -EIO;
+}
+
+static int tegra_dc_dpaux_read_chunk(struct tegra_dp_priv *dp, u32 cmd,
+ u32 addr, u8 *data, u32 *size,
+ u32 *aux_stat)
+{
+ u32 reg_val;
+ u32 timeout_retries = DP_AUX_TIMEOUT_MAX_TRIES;
+ u32 defer_retries = DP_AUX_DEFER_MAX_TRIES;
+
+ if (*size > DP_AUX_MAX_BYTES) {
+ debug("only read one chunk\n");
+ return -EIO; /* only read one chunk */
+ }
+
+ /* Check to make sure the command is read command */
+ switch (cmd) {
+ case DPAUX_DP_AUXCTL_CMD_I2CRD:
+ case DPAUX_DP_AUXCTL_CMD_I2CREQWSTAT:
+ case DPAUX_DP_AUXCTL_CMD_MOTRD:
+ case DPAUX_DP_AUXCTL_CMD_AUXRD:
+ break;
+ default:
+ debug("dp: aux read cmd 0x%x is invalid\n", cmd);
+ return -EIO;
+ }
+
+ *aux_stat = tegra_dpaux_readl(dp, DPAUX_DP_AUXSTAT);
+ if (!(*aux_stat & DPAUX_DP_AUXSTAT_HPD_STATUS_PLUGGED)) {
+ debug("dp: HPD is not detected\n");
+ return -EIO;
+ }
+
+ tegra_dpaux_writel(dp, DPAUX_DP_AUXADDR, addr);
+
+ reg_val = tegra_dpaux_readl(dp, DPAUX_DP_AUXCTL);
+ reg_val &= ~DPAUX_DP_AUXCTL_CMD_MASK;
+ reg_val |= cmd;
+ reg_val &= ~DPAUX_DP_AUXCTL_CMDLEN_FIELD;
+ reg_val |= ((*size - 1) << DPAUX_DP_AUXCTL_CMDLEN_SHIFT);
+ while ((timeout_retries > 0) && (defer_retries > 0)) {
+ if ((timeout_retries != DP_AUX_TIMEOUT_MAX_TRIES) ||
+ (defer_retries != DP_AUX_DEFER_MAX_TRIES))
+ udelay(DP_DPCP_RETRY_SLEEP_NS * 2);
+
+ reg_val |= DPAUX_DP_AUXCTL_TRANSACTREQ_PENDING;
+ tegra_dpaux_writel(dp, DPAUX_DP_AUXCTL, reg_val);
+
+ if (tegra_dpaux_wait_transaction(dp))
+ debug("dp: aux read transaction timeout\n");
+
+ *aux_stat = tegra_dpaux_readl(dp, DPAUX_DP_AUXSTAT);
+
+ if ((*aux_stat & DPAUX_DP_AUXSTAT_TIMEOUT_ERROR_PENDING) ||
+ (*aux_stat & DPAUX_DP_AUXSTAT_RX_ERROR_PENDING) ||
+ (*aux_stat & DPAUX_DP_AUXSTAT_SINKSTAT_ERROR_PENDING) ||
+ (*aux_stat & DPAUX_DP_AUXSTAT_NO_STOP_ERROR_PENDING)) {
+ if (timeout_retries-- > 0) {
+ debug("dp: aux read retry (0x%x) -- %d\n",
+ *aux_stat, timeout_retries);
+ /* clear the error bits */
+ tegra_dpaux_writel(dp, DPAUX_DP_AUXSTAT,
+ *aux_stat);
+ continue; /* retry */
+ } else {
+ debug("dp: aux read got error (0x%x)\n",
+ *aux_stat);
+ return -ETIMEDOUT;
+ }
+ }
+
+ if ((*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_I2CDEFER) ||
+ (*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_DEFER)) {
+ if (defer_retries-- > 0) {
+ debug("dp: aux read defer (0x%x) -- %d\n",
+ *aux_stat, defer_retries);
+ /* clear the error bits */
+ tegra_dpaux_writel(dp, DPAUX_DP_AUXSTAT,
+ *aux_stat);
+ continue;
+ } else {
+ debug("dp: aux read defer exceeds max retries (0x%x)\n",
+ *aux_stat);
+ return -ETIMEDOUT;
+ }
+ }
+
+ if ((*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_MASK) ==
+ DPAUX_DP_AUXSTAT_REPLYTYPE_ACK) {
+ int i;
+ u32 temp_data[4];
+
+ for (i = 0; i < DP_AUX_MAX_BYTES / 4; ++i)
+ temp_data[i] = tegra_dpaux_readl(dp,
+ DPAUX_DP_AUXDATA_READ_W(i));
+
+ *size = ((*aux_stat) & DPAUX_DP_AUXSTAT_REPLY_M_MASK);
+ memcpy(data, temp_data, *size);
+
+ return 0;
+ } else {
+ debug("dp: aux read failed (0x%x\n", *aux_stat);
+ return -EIO;
+ }
+ }
+ /* Should never come to here */
+ debug("%s: can't\n", __func__);
+
+ return -EIO;
+}
+
+static int tegra_dc_dpaux_read(struct tegra_dp_priv *dp, u32 cmd, u32 addr,
+ u8 *data, u32 *size, u32 *aux_stat)
+{
+ u32 finished = 0;
+ u32 cur_size;
+ int ret = 0;
+
+ do {
+ cur_size = *size - finished;
+ if (cur_size > DP_AUX_MAX_BYTES)
+ cur_size = DP_AUX_MAX_BYTES;
+
+ ret = tegra_dc_dpaux_read_chunk(dp, cmd, addr,
+ data, &cur_size, aux_stat);
+ if (ret)
+ break;
+
+ /* cur_size should be the real size returned */
+ addr += cur_size;
+ data += cur_size;
+ finished += cur_size;
+
+ } while (*size > finished);
+ *size = finished;
+
+ return ret;
+}
+
+static int tegra_dc_dp_dpcd_read(struct tegra_dp_priv *dp, u32 cmd,
+ u8 *data_ptr)
+{
+ u32 size = 1;
+ u32 status = 0;
+ int ret;
+
+ ret = tegra_dc_dpaux_read_chunk(dp, DPAUX_DP_AUXCTL_CMD_AUXRD,
+ cmd, data_ptr, &size, &status);
+ if (ret) {
+ debug("dp: Failed to read DPCD data. CMD 0x%x, Status 0x%x\n",
+ cmd, status);
+ }
+
+ return ret;
+}
+
+static int tegra_dc_dp_dpcd_write(struct tegra_dp_priv *dp, u32 cmd,
+ u8 data)
+{
+ u32 size = 1;
+ u32 status = 0;
+ int ret;
+
+ ret = tegra_dc_dpaux_write_chunk(dp, DPAUX_DP_AUXCTL_CMD_AUXWR,
+ cmd, &data, &size, &status);
+ if (ret) {
+ debug("dp: Failed to write DPCD data. CMD 0x%x, Status 0x%x\n",
+ cmd, status);
+ }
+
+ return ret;
+}
+
+static int tegra_dc_i2c_aux_read(struct tegra_dp_priv *dp, u32 i2c_addr,
+ u8 addr, u8 *data, u32 size, u32 *aux_stat)
+{
+ u32 finished = 0;
+ int ret = 0;
+
+ do {
+ u32 cur_size = min((u32)DP_AUX_MAX_BYTES, size - finished);
+
+ u32 len = 1;
+ ret = tegra_dc_dpaux_write_chunk(
+ dp, DPAUX_DP_AUXCTL_CMD_MOTWR, i2c_addr,
+ &addr, &len, aux_stat);
+ if (ret) {
+ debug("%s: error sending address to read.\n",
+ __func__);
+ return ret;
+ }
+
+ ret = tegra_dc_dpaux_read_chunk(
+ dp, DPAUX_DP_AUXCTL_CMD_I2CRD, i2c_addr,
+ data, &cur_size, aux_stat);
+ if (ret) {
+ debug("%s: error reading data.\n", __func__);
+ return ret;
+ }
+
+ /* cur_size should be the real size returned */
+ addr += cur_size;
+ data += cur_size;
+ finished += cur_size;
+ } while (size > finished);
+
+ return finished;
+}
+
+static void tegra_dc_dpaux_enable(struct tegra_dp_priv *dp)
+{
+ /* clear interrupt */
+ tegra_dpaux_writel(dp, DPAUX_INTR_AUX, 0xffffffff);
+ /* do not enable interrupt for now. Enable them when Isr in place */
+ tegra_dpaux_writel(dp, DPAUX_INTR_EN_AUX, 0x0);
+
+ tegra_dpaux_writel(dp, DPAUX_HYBRID_PADCTL,
+ DPAUX_HYBRID_PADCTL_AUX_DRVZ_OHM_50 |
+ DPAUX_HYBRID_PADCTL_AUX_CMH_V0_70 |
+ 0x18 << DPAUX_HYBRID_PADCTL_AUX_DRVI_SHIFT |
+ DPAUX_HYBRID_PADCTL_AUX_INPUT_RCV_ENABLE);
+
+ tegra_dpaux_writel(dp, DPAUX_HYBRID_SPARE,
+ DPAUX_HYBRID_SPARE_PAD_PWR_POWERUP);
+}
+
+#ifdef DEBUG
+static void tegra_dc_dp_dump_link_cfg(struct tegra_dp_priv *dp,
+ const struct tegra_dp_link_config *link_cfg)
+{
+ debug("DP config: cfg_name cfg_value\n");
+ debug(" Lane Count %d\n",
+ link_cfg->max_lane_count);
+ debug(" SupportEnhancedFraming %s\n",
+ link_cfg->support_enhanced_framing ? "Y" : "N");
+ debug(" Bandwidth %d\n",
+ link_cfg->max_link_bw);
+ debug(" bpp %d\n",
+ link_cfg->bits_per_pixel);
+ debug(" EnhancedFraming %s\n",
+ link_cfg->enhanced_framing ? "Y" : "N");
+ debug(" Scramble_enabled %s\n",
+ link_cfg->scramble_ena ? "Y" : "N");
+ debug(" LinkBW %d\n",
+ link_cfg->link_bw);
+ debug(" lane_count %d\n",
+ link_cfg->lane_count);
+ debug(" activespolarity %d\n",
+ link_cfg->activepolarity);
+ debug(" active_count %d\n",
+ link_cfg->active_count);
+ debug(" tu_size %d\n",
+ link_cfg->tu_size);
+ debug(" active_frac %d\n",
+ link_cfg->active_frac);
+ debug(" watermark %d\n",
+ link_cfg->watermark);
+ debug(" hblank_sym %d\n",
+ link_cfg->hblank_sym);
+ debug(" vblank_sym %d\n",
+ link_cfg->vblank_sym);
+}
+#endif
+
+/*
+ * Calcuate if given cfg can meet the mode request.
+ * Return 0 if mode is possible, -1 otherwise
+ */
+static int tegra_dc_dp_calc_config(struct tegra_dp_priv *dp,
+ const struct display_timing *timing,
+ struct tegra_dp_link_config *link_cfg)
+{
+ const u32 link_rate = 27 * link_cfg->link_bw * 1000 * 1000;
+ const u64 f = 100000; /* precision factor */
+ u32 num_linkclk_line; /* Number of link clocks per line */
+ u64 ratio_f; /* Ratio of incoming to outgoing data rate */
+ u64 frac_f;
+ u64 activesym_f; /* Activesym per TU */
+ u64 activecount_f;
+ u32 activecount;
+ u32 activepolarity;
+ u64 approx_value_f;
+ u32 activefrac = 0;
+ u64 accumulated_error_f = 0;
+ u32 lowest_neg_activecount = 0;
+ u32 lowest_neg_activepolarity = 0;
+ u32 lowest_neg_tusize = 64;
+ u32 num_symbols_per_line;
+ u64 lowest_neg_activefrac = 0;
+ u64 lowest_neg_error_f = 64 * f;
+ u64 watermark_f;
+ int i;
+ int neg;
+
+ if (!link_rate || !link_cfg->lane_count || !timing->pixelclock.typ ||
+ !link_cfg->bits_per_pixel)
+ return -1;
+
+ if ((u64)timing->pixelclock.typ * link_cfg->bits_per_pixel >=
+ (u64)link_rate * 8 * link_cfg->lane_count)
+ return -1;
+
+ num_linkclk_line = (u32)(lldiv(link_rate * timing->hactive.typ,
+ timing->pixelclock.typ));
+
+ ratio_f = (u64)timing->pixelclock.typ * link_cfg->bits_per_pixel * f;
+ ratio_f /= 8;
+ do_div(ratio_f, link_rate * link_cfg->lane_count);
+
+ for (i = 64; i >= 32; --i) {
+ activesym_f = ratio_f * i;
+ activecount_f = lldiv(activesym_f, (u32)f) * f;
+ frac_f = activesym_f - activecount_f;
+ activecount = (u32)(lldiv(activecount_f, (u32)f));
+
+ if (frac_f < (lldiv(f, 2))) /* fraction < 0.5 */
+ activepolarity = 0;
+ else {
+ activepolarity = 1;
+ frac_f = f - frac_f;
+ }
+
+ if (frac_f != 0) {
+ /* warning: frac_f should be 64-bit */
+ frac_f = lldiv(f * f, frac_f); /* 1 / fraction */
+ if (frac_f > (15 * f))
+ activefrac = activepolarity ? 1 : 15;
+ else
+ activefrac = activepolarity ?
+ (u32)lldiv(frac_f, (u32)f) + 1 :
+ (u32)lldiv(frac_f, (u32)f);
+ }
+
+ if (activefrac == 1)
+ activepolarity = 0;
+
+ if (activepolarity == 1)
+ approx_value_f = activefrac ? lldiv(
+ (activecount_f + (activefrac * f - f) * f),
+ (activefrac * f)) :
+ activecount_f + f;
+ else
+ approx_value_f = activefrac ?
+ activecount_f + lldiv(f, activefrac) :
+ activecount_f;
+
+ if (activesym_f < approx_value_f) {
+ accumulated_error_f = num_linkclk_line *
+ lldiv(approx_value_f - activesym_f, i);
+ neg = 1;
+ } else {
+ accumulated_error_f = num_linkclk_line *
+ lldiv(activesym_f - approx_value_f, i);
+ neg = 0;
+ }
+
+ if ((neg && (lowest_neg_error_f > accumulated_error_f)) ||
+ (accumulated_error_f == 0)) {
+ lowest_neg_error_f = accumulated_error_f;
+ lowest_neg_tusize = i;
+ lowest_neg_activecount = activecount;
+ lowest_neg_activepolarity = activepolarity;
+ lowest_neg_activefrac = activefrac;
+
+ if (accumulated_error_f == 0)
+ break;
+ }
+ }
+
+ if (lowest_neg_activefrac == 0) {
+ link_cfg->activepolarity = 0;
+ link_cfg->active_count = lowest_neg_activepolarity ?
+ lowest_neg_activecount : lowest_neg_activecount - 1;
+ link_cfg->tu_size = lowest_neg_tusize;
+ link_cfg->active_frac = 1;
+ } else {
+ link_cfg->activepolarity = lowest_neg_activepolarity;
+ link_cfg->active_count = (u32)lowest_neg_activecount;
+ link_cfg->tu_size = lowest_neg_tusize;
+ link_cfg->active_frac = (u32)lowest_neg_activefrac;
+ }
+
+ watermark_f = lldiv(ratio_f * link_cfg->tu_size * (f - ratio_f), f);
+ link_cfg->watermark = (u32)(lldiv(watermark_f + lowest_neg_error_f,
+ f)) + link_cfg->bits_per_pixel / 4 - 1;
+ num_symbols_per_line = (timing->hactive.typ *
+ link_cfg->bits_per_pixel) /
+ (8 * link_cfg->lane_count);
+
+ if (link_cfg->watermark > 30) {
+ debug("dp: sor setting: unable to get a good tusize, force watermark to 30\n");
+ link_cfg->watermark = 30;
+ return -1;
+ } else if (link_cfg->watermark > num_symbols_per_line) {
+ debug("dp: sor setting: force watermark to the number of symbols in the line\n");
+ link_cfg->watermark = num_symbols_per_line;
+ return -1;
+ }
+
+ /*
+ * Refer to dev_disp.ref for more information.
+ * # symbols/hblank = ((SetRasterBlankEnd.X + SetRasterSize.Width -
+ * SetRasterBlankStart.X - 7) * link_clk / pclk)
+ * - 3 * enhanced_framing - Y
+ * where Y = (# lanes == 4) 3 : (# lanes == 2) ? 6 : 12
+ */
+ link_cfg->hblank_sym = (int)lldiv(((uint64_t)timing->hback_porch.typ +
+ timing->hfront_porch.typ + timing->hsync_len.typ - 7) *
+ link_rate, timing->pixelclock.typ) -
+ 3 * link_cfg->enhanced_framing -
+ (12 / link_cfg->lane_count);
+
+ if (link_cfg->hblank_sym < 0)
+ link_cfg->hblank_sym = 0;
+
+
+ /*
+ * Refer to dev_disp.ref for more information.
+ * # symbols/vblank = ((SetRasterBlankStart.X -
+ * SetRasterBlankEen.X - 25) * link_clk / pclk)
+ * - Y - 1;
+ * where Y = (# lanes == 4) 12 : (# lanes == 2) ? 21 : 39
+ */
+ link_cfg->vblank_sym = (int)lldiv(((uint64_t)timing->hactive.typ - 25)
+ * link_rate, timing->pixelclock.typ) - (36 /
+ link_cfg->lane_count) - 4;
+
+ if (link_cfg->vblank_sym < 0)
+ link_cfg->vblank_sym = 0;
+
+ link_cfg->is_valid = 1;
+#ifdef DEBUG
+ tegra_dc_dp_dump_link_cfg(dp, link_cfg);
+#endif
+
+ return 0;
+}
+
+static int tegra_dc_dp_init_max_link_cfg(
+ const struct display_timing *timing,
+ struct tegra_dp_priv *dp,
+ struct tegra_dp_link_config *link_cfg)
+{
+ const int drive_current = 0x40404040;
+ const int preemphasis = 0x0f0f0f0f;
+ const int postcursor = 0;
+ u8 dpcd_data;
+ int ret;
+
+ ret = tegra_dc_dp_dpcd_read(dp, DP_MAX_LANE_COUNT, &dpcd_data);
+ if (ret)
+ return ret;
+ link_cfg->max_lane_count = dpcd_data & DP_MAX_LANE_COUNT_MASK;
+
+ link_cfg->support_enhanced_framing =
+ (dpcd_data & DP_MAX_LANE_COUNT_ENHANCED_FRAMING_YES) ?
+ 1 : 0;
+
+ ret = tegra_dc_dp_dpcd_read(dp, DP_MAX_DOWNSPREAD, &dpcd_data);
+ if (ret)
+ return ret;
+ link_cfg->downspread = (dpcd_data & DP_MAX_DOWNSPREAD_VAL_0_5_PCT) ?
+ 1 : 0;
+
+ ret = tegra_dc_dp_dpcd_read(dp, DP_MAX_LINK_RATE,
+ &link_cfg->max_link_bw);
+ if (ret)
+ return ret;
+
+ /*
+ * Set to a high value for link training and attach.
+ * Will be re-programmed when dp is enabled.
+ */
+ link_cfg->drive_current = drive_current;
+ link_cfg->preemphasis = preemphasis;
+ link_cfg->postcursor = postcursor;
+
+ ret = tegra_dc_dp_dpcd_read(dp, DP_EDP_CONFIGURATION_CAP, &dpcd_data);
+ if (ret)
+ return ret;
+
+ link_cfg->alt_scramber_reset_cap =
+ (dpcd_data & DP_EDP_CONFIGURATION_CAP_ASC_RESET_YES) ?
+ 1 : 0;
+ link_cfg->only_enhanced_framing =
+ (dpcd_data & DP_EDP_CONFIGURATION_CAP_FRAMING_CHANGE_YES) ?
+ 1 : 0;
+
+ link_cfg->lane_count = link_cfg->max_lane_count;
+ link_cfg->link_bw = link_cfg->max_link_bw;
+ link_cfg->enhanced_framing = link_cfg->support_enhanced_framing;
+
+ tegra_dc_dp_calc_config(dp, timing, link_cfg);
+ return 0;
+}
+
+static int tegra_dc_dp_set_assr(struct tegra_dp_priv *dp,
+ struct tegra_dc_sor_data *sor, int ena)
+{
+ int ret;
+
+ u8 dpcd_data = ena ?
+ DP_MAIN_LINK_CHANNEL_CODING_SET_ASC_RESET_ENABLE :
+ DP_MAIN_LINK_CHANNEL_CODING_SET_ASC_RESET_DISABLE;
+
+ ret = tegra_dc_dp_dpcd_write(dp, DP_EDP_CONFIGURATION_SET,
+ dpcd_data);
+ if (ret)
+ return ret;
+
+ /* Also reset the scrambler to 0xfffe */
+ tegra_dc_sor_set_internal_panel(sor, ena);
+ return 0;
+}
+
+static int tegra_dp_set_link_bandwidth(struct tegra_dp_priv *dp,
+ struct tegra_dc_sor_data *sor,
+ u8 link_bw)
+{
+ tegra_dc_sor_set_link_bandwidth(sor, link_bw);
+
+ /* Sink side */
+ return tegra_dc_dp_dpcd_write(dp, DP_LINK_BW_SET, link_bw);
+}
+
+static int tegra_dp_set_lane_count(struct tegra_dp_priv *dp,
+ const struct tegra_dp_link_config *link_cfg,
+ struct tegra_dc_sor_data *sor)
+{
+ u8 dpcd_data;
+ int ret;
+
+ /* check if panel support enhanched_framing */
+ dpcd_data = link_cfg->lane_count;
+ if (link_cfg->enhanced_framing)
+ dpcd_data |= DP_LANE_COUNT_SET_ENHANCEDFRAMING_T;
+ ret = tegra_dc_dp_dpcd_write(dp, DP_LANE_COUNT_SET, dpcd_data);
+ if (ret)
+ return ret;
+
+ tegra_dc_sor_set_lane_count(sor, link_cfg->lane_count);
+
+ /* Also power down lanes that will not be used */
+ return 0;
+}
+
+static int tegra_dc_dp_link_trained(struct tegra_dp_priv *dp,
+ const struct tegra_dp_link_config *cfg)
+{
+ u32 lane;
+ u8 mask;
+ u8 data;
+ int ret;
+
+ for (lane = 0; lane < cfg->lane_count; ++lane) {
+ ret = tegra_dc_dp_dpcd_read(dp, (lane / 2) ?
+ DP_LANE2_3_STATUS : DP_LANE0_1_STATUS,
+ &data);
+ if (ret)
+ return ret;
+ mask = (lane & 1) ?
+ NV_DPCD_STATUS_LANEXPLUS1_CR_DONE_YES |
+ NV_DPCD_STATUS_LANEXPLUS1_CHN_EQ_DONE_YES |
+ NV_DPCD_STATUS_LANEXPLUS1_SYMBOL_LOCKED_YES :
+ DP_LANE_CR_DONE |
+ DP_LANE_CHANNEL_EQ_DONE |
+ DP_LANE_SYMBOL_LOCKED;
+ if ((data & mask) != mask)
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * All link training functions are ported from kernel dc driver.
+ * See more details at drivers/video/tegra/dc/dp.c
+ */
+static int tegra_dc_dp_fast_link_training(struct tegra_dp_priv *dp,
+ const struct tegra_dp_link_config *link_cfg,
+ struct tegra_dc_sor_data *sor)
+{
+ u8 link_bw;
+ u8 lane_count;
+ u16 data16;
+ u32 data32;
+ u32 size;
+ u32 status;
+ int j;
+ u32 mask = 0xffff >> ((4 - link_cfg->lane_count) * 4);
+
+ tegra_dc_sor_set_lane_parm(sor, link_cfg);
+ tegra_dc_dp_dpcd_write(dp, DP_MAIN_LINK_CHANNEL_CODING_SET,
+ DP_SET_ANSI_8B10B);
+
+ /* Send TP1 */
+ tegra_dc_sor_set_dp_linkctl(sor, 1, training_pattern_1, link_cfg);
+ tegra_dc_dp_dpcd_write(dp, DP_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_1);
+
+ for (j = 0; j < link_cfg->lane_count; ++j)
+ tegra_dc_dp_dpcd_write(dp, DP_TRAINING_LANE0_SET + j, 0x24);
+ udelay(520);
+
+ size = sizeof(data16);
+ tegra_dc_dpaux_read(dp, DPAUX_DP_AUXCTL_CMD_AUXRD,
+ DP_LANE0_1_STATUS, (u8 *)&data16, &size, &status);
+ status = mask & 0x1111;
+ if ((data16 & status) != status) {
+ debug("dp: Link training error for TP1 (%#x, status %#x)\n",
+ data16, status);
+ return -EFAULT;
+ }
+
+ /* enable ASSR */
+ tegra_dc_dp_set_assr(dp, sor, link_cfg->scramble_ena);
+ tegra_dc_sor_set_dp_linkctl(sor, 1, training_pattern_3, link_cfg);
+
+ tegra_dc_dp_dpcd_write(dp, DP_TRAINING_PATTERN_SET,
+ link_cfg->link_bw == 20 ? 0x23 : 0x22);
+ for (j = 0; j < link_cfg->lane_count; ++j)
+ tegra_dc_dp_dpcd_write(dp, DP_TRAINING_LANE0_SET + j, 0x24);
+ udelay(520);
+
+ size = sizeof(data32);
+ tegra_dc_dpaux_read(dp, DPAUX_DP_AUXCTL_CMD_AUXRD, DP_LANE0_1_STATUS,
+ (u8 *)&data32, &size, &status);
+ if ((data32 & mask) != (0x7777 & mask)) {
+ debug("dp: Link training error for TP2/3 (0x%x)\n", data32);
+ return -EFAULT;
+ }
+
+ tegra_dc_sor_set_dp_linkctl(sor, 1, training_pattern_disabled,
+ link_cfg);
+ tegra_dc_dp_dpcd_write(dp, DP_TRAINING_PATTERN_SET, 0);
+
+ if (tegra_dc_dp_link_trained(dp, link_cfg)) {
+ tegra_dc_sor_read_link_config(sor, &link_bw, &lane_count);
+ debug("Fast link training failed, link bw %d, lane # %d\n",
+ link_bw, lane_count);
+ return -EFAULT;
+ }
+
+ debug("Fast link training succeeded, link bw %d, lane %d\n",
+ link_cfg->link_bw, link_cfg->lane_count);
+
+ return 0;
+}
+
+static int tegra_dp_link_config(struct tegra_dp_priv *dp,
+ const struct tegra_dp_link_config *link_cfg,
+ struct tegra_dc_sor_data *sor)
+{
+ u8 dpcd_data;
+ u8 link_bw;
+ u8 lane_count;
+ u32 retry;
+ int ret;
+
+ if (link_cfg->lane_count == 0) {
+ debug("dp: error: lane count is 0. Can not set link config.\n");
+ return -1;
+ }
+
+ /* Set power state if it is not in normal level */
+ ret = tegra_dc_dp_dpcd_read(dp, DP_SET_POWER, &dpcd_data);
+ if (ret)
+ return ret;
+ if (dpcd_data == DP_SET_POWER_D3) {
+ dpcd_data = DP_SET_POWER_D0;
+ retry = 3; /* DP spec requires 3 retries */
+ do {
+ ret = tegra_dc_dp_dpcd_write(dp,
+ DP_SET_POWER, dpcd_data);
+ } while ((--retry > 0) && ret);
+ if (ret) {
+ debug("dp: Failed to set DP panel power\n");
+ return ret;
+ }
+ }
+
+ /* Enable ASSR if possible */
+ if (link_cfg->alt_scramber_reset_cap) {
+ ret = tegra_dc_dp_set_assr(dp, sor, 1);
+ if (ret)
+ return ret;
+ }
+
+ ret = tegra_dp_set_link_bandwidth(dp, sor, link_cfg->link_bw);
+ if (ret) {
+ debug("dp: Failed to set link bandwidth\n");
+ return ret;
+ }
+ ret = tegra_dp_set_lane_count(dp, link_cfg, sor);
+ if (ret) {
+ debug("dp: Failed to set lane count\n");
+ return ret;
+ }
+ tegra_dc_sor_set_dp_linkctl(sor, 1, training_pattern_none, link_cfg);
+
+ /* Now do the fast link training for eDP */
+ ret = tegra_dc_dp_fast_link_training(dp, link_cfg, sor);
+ if (ret) {
+ debug("dp: fast link training failed\n");
+ return ret;
+ }
+
+ /* Everything is good; double check the link config */
+ tegra_dc_sor_read_link_config(sor, &link_bw, &lane_count);
+
+ if ((link_cfg->link_bw == link_bw) &&
+ (link_cfg->lane_count == lane_count))
+ return 0;
+ else
+ return -EFAULT;
+}
+
+static int tegra_dc_dp_explore_link_cfg(struct tegra_dp_priv *dp,
+ struct tegra_dp_link_config *link_cfg,
+ struct tegra_dc_sor_data *sor,
+ const struct display_timing *timing)
+{
+ struct tegra_dp_link_config temp_cfg;
+
+ if (!timing->pixelclock.typ || !timing->hactive.typ ||
+ !timing->vactive.typ) {
+ debug("dp: error mode configuration");
+ return -EINVAL;
+ }
+ if (!link_cfg->max_link_bw || !link_cfg->max_lane_count) {
+ debug("dp: error link configuration");
+ return -EINVAL;
+ }
+
+ link_cfg->is_valid = 0;
+
+ memcpy(&temp_cfg, link_cfg, sizeof(temp_cfg));
+
+ temp_cfg.link_bw = temp_cfg.max_link_bw;
+ temp_cfg.lane_count = temp_cfg.max_lane_count;
+
+ /*
+ * set to max link config
+ */
+ if ((!tegra_dc_dp_calc_config(dp, timing, &temp_cfg)) &&
+ (!(tegra_dp_link_config(dp, &temp_cfg, sor))))
+ /* the max link cfg is doable */
+ memcpy(link_cfg, &temp_cfg, sizeof(temp_cfg));
+
+ return link_cfg->is_valid ? 0 : -EFAULT;
+}
+
+static int tegra_dp_hpd_plug(struct tegra_dp_priv *dp)
+{
+ const int vdd_to_hpd_delay_ms = 200;
+ u32 val;
+ ulong start;
+
+ start = get_timer(0);
+ do {
+ val = tegra_dpaux_readl(dp, DPAUX_DP_AUXSTAT);
+ if (val & DPAUX_DP_AUXSTAT_HPD_STATUS_PLUGGED)
+ return 0;
+ udelay(100);
+ } while (get_timer(start) < vdd_to_hpd_delay_ms);
+
+ return -EIO;
+}
+
+int tegra_dp_enable(struct udevice *dev, int panel_bpp,
+ const struct display_timing *timing)
+{
+ struct tegra_dp_priv *priv = dev_get_priv(dev);
+ struct tegra_dp_link_config slink_cfg, *link_cfg = &slink_cfg;
+ struct tegra_dc_sor_data *sor;
+ int data;
+ int retry;
+ int ret;
+
+ memset(link_cfg, '\0', sizeof(*link_cfg));
+ link_cfg->is_valid = 0;
+ link_cfg->scramble_ena = 1;
+
+ tegra_dc_dpaux_enable(priv);
+
+ if (tegra_dp_hpd_plug(priv) < 0) {
+ debug("dp: hpd plug failed\n");
+ return -EIO;
+ }
+
+ link_cfg->bits_per_pixel = panel_bpp;
+ if (tegra_dc_dp_init_max_link_cfg(timing, priv, link_cfg)) {
+ debug("dp: failed to init link configuration\n");
+ return -ENOLINK;
+ }
+
+ ret = tegra_dc_sor_init(&sor);
+ if (ret)
+ return ret;
+ priv->sor = sor;
+ ret = tegra_dc_sor_enable_dp(sor, link_cfg);
+ if (ret)
+ return ret;
+
+ tegra_dc_sor_set_panel_power(sor, 1);
+
+ /* Write power on to DPCD */
+ data = DP_SET_POWER_D0;
+ retry = 0;
+ do {
+ ret = tegra_dc_dp_dpcd_write(priv, DP_SET_POWER, data);
+ } while ((retry++ < DP_POWER_ON_MAX_TRIES) && ret);
+
+ if (ret || retry >= DP_POWER_ON_MAX_TRIES) {
+ debug("dp: failed to power on panel (0x%x)\n", ret);
+ return -ENETUNREACH;
+ goto error_enable;
+ }
+
+ /* Confirm DP plugging status */
+ if (!(tegra_dpaux_readl(priv, DPAUX_DP_AUXSTAT) &
+ DPAUX_DP_AUXSTAT_HPD_STATUS_PLUGGED)) {
+ debug("dp: could not detect HPD\n");
+ return -ENXIO;
+ }
+
+ /* Check DP version */
+ if (tegra_dc_dp_dpcd_read(priv, DP_DPCD_REV, &priv->revision)) {
+ debug("dp: failed to read the revision number from sink\n");
+ return -EIO;
+ }
+
+ if (tegra_dc_dp_explore_link_cfg(priv, link_cfg, sor, timing)) {
+ debug("dp: error configuring link\n");
+ return -ENOMEDIUM;
+ }
+
+ tegra_dc_sor_set_power_state(sor, 1);
+ ret = tegra_dc_sor_attach(sor, link_cfg, timing);
+ if (ret && ret != -EEXIST)
+ return ret;
+
+ /* Power down the unused lanes to save power - a few hundred mW */
+ tegra_dc_sor_power_down_unused_lanes(sor, link_cfg);
+
+ priv->enabled = true;
+error_enable:
+ return 0;
+}
+
+static int tegra_dp_ofdata_to_platdata(struct udevice *dev)
+{
+ struct tegra_dp_plat *plat = dev_get_platdata(dev);
+ const void *blob = gd->fdt_blob;
+
+ plat->base = fdtdec_get_addr(blob, dev->of_offset, "reg");
+
+ return 0;
+}
+
+static int tegra_dp_read_edid(struct udevice *dev, u8 *buf, int buf_size)
+{
+ struct tegra_dp_priv *priv = dev_get_priv(dev);
+ const int tegra_edid_i2c_address = 0x50;
+ u32 aux_stat = 0;
+
+ tegra_dc_dpaux_enable(priv);
+
+ return tegra_dc_i2c_aux_read(priv, tegra_edid_i2c_address, 0, buf,
+ buf_size, &aux_stat);
+}
+
+static const struct dm_display_port_ops dp_tegra_ops = {
+ .read_edid = tegra_dp_read_edid,
+ .enable = tegra_dp_enable,
+};
+
+static int dp_tegra_probe(struct udevice *dev)
+{
+ struct tegra_dp_plat *plat = dev_get_platdata(dev);
+ struct tegra_dp_priv *priv = dev_get_priv(dev);
+
+ priv->regs = (struct dpaux_ctlr *)plat->base;
+ priv->enabled = false;
+
+ return 0;
+}
+
+static const struct udevice_id tegra_dp_ids[] = {
+ { .compatible = "nvidia,tegra124-dpaux" },
+ { }
+};
+
+U_BOOT_DRIVER(dp_tegra) = {
+ .name = "dpaux_tegra",
+ .id = UCLASS_DISPLAY_PORT,
+ .of_match = tegra_dp_ids,
+ .ofdata_to_platdata = tegra_dp_ofdata_to_platdata,
+ .probe = dp_tegra_probe,
+ .ops = &dp_tegra_ops,
+ .priv_auto_alloc_size = sizeof(struct tegra_dp_priv),
+ .platdata_auto_alloc_size = sizeof(struct tegra_dp_plat),
+};
--
2.2.0.rc0.207.ga3a616c