This driver creates DRM encoder and connector for ZynqMP DisplayPort.
Signed-off-by: Hyun Kwon <hyun.kwon@xxxxxxxxxx>
Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
v8
- Allow to initialize without any phy lane
v7
- Use correct number of lanes
v6
- Constify all function pointers
- Clean up the duplicated license paragraphs
- Do complete forward declaration in the header
v2
- Change the SPDX identifier format
- Split drm properties into a separate patch
---
---
drivers/gpu/drm/xlnx/zynqmp_dp.c | 1756 ++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/xlnx/zynqmp_dp.h | 30 +
2 files changed, 1786 insertions(+)
create mode 100644 drivers/gpu/drm/xlnx/zynqmp_dp.c
create mode 100644 drivers/gpu/drm/xlnx/zynqmp_dp.h
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
new file mode 100644
index 0000000..e60f07b
--- /dev/null
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -0,0 +1,1756 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ZynqMP DisplayPort Driver
+ *
+ * Copyright (C) 2017 - 2018 Xilinx, Inc.
+ *
+ * Author: Hyun Woo Kwon <hyun.kwon@xxxxxxxxxx>
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_of.h>
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/uaccess.h>
+
+#include "zynqmp_disp.h"
+#include "zynqmp_dpsub.h"
+
+static uint zynqmp_dp_aux_timeout_ms = 50;
+module_param_named(aux_timeout_ms, zynqmp_dp_aux_timeout_ms, uint, 0444);
+MODULE_PARM_DESC(aux_timeout_ms, "DP aux timeout value in msec (default: 50)");
+
+/*
+ * Some sink requires a delay after power on request
+ */
+static uint zynqmp_dp_power_on_delay_ms = 4;
+module_param_named(power_on_delay_ms, zynqmp_dp_power_on_delay_ms, uint, 0444);
+MODULE_PARM_DESC(aux_timeout_ms, "DP power on delay in msec (default: 4)");
+
+/* Link configuration registers */
+#define ZYNQMP_DP_TX_LINK_BW_SET 0x0
+#define ZYNQMP_DP_TX_LANE_CNT_SET 0x4
+#define ZYNQMP_DP_TX_ENHANCED_FRAME_EN 0x8
+#define ZYNQMP_DP_TX_TRAINING_PATTERN_SET 0xc
+#define ZYNQMP_DP_TX_SCRAMBLING_DISABLE 0x14
+#define ZYNQMP_DP_TX_DOWNSPREAD_CTL 0x18
+#define ZYNQMP_DP_TX_SW_RESET 0x1c
+#define ZYNQMP_DP_TX_SW_RESET_STREAM1 BIT(0)
+#define ZYNQMP_DP_TX_SW_RESET_STREAM2 BIT(1)
+#define ZYNQMP_DP_TX_SW_RESET_STREAM3 BIT(2)
+#define ZYNQMP_DP_TX_SW_RESET_STREAM4 BIT(3)
+#define ZYNQMP_DP_TX_SW_RESET_AUX BIT(7)
+#define ZYNQMP_DP_TX_SW_RESET_ALL (ZYNQMP_DP_TX_SW_RESET_STREAM1 | \
+ ZYNQMP_DP_TX_SW_RESET_STREAM2 | \
+ ZYNQMP_DP_TX_SW_RESET_STREAM3 | \
+ ZYNQMP_DP_TX_SW_RESET_STREAM4 | \
+ ZYNQMP_DP_TX_SW_RESET_AUX)
+
+/* Core enable registers */
+#define ZYNQMP_DP_TX_ENABLE 0x80
+#define ZYNQMP_DP_TX_ENABLE_MAIN_STREAM 0x84
+#define ZYNQMP_DP_TX_FORCE_SCRAMBLER_RESET 0xc0
+#define ZYNQMP_DP_TX_VERSION 0xf8
+#define ZYNQMP_DP_TX_VERSION_MAJOR_MASK GENMASK(31, 24)
+#define ZYNQMP_DP_TX_VERSION_MAJOR_SHIFT 24
+#define ZYNQMP_DP_TX_VERSION_MINOR_MASK GENMASK(23, 16)
+#define ZYNQMP_DP_TX_VERSION_MINOR_SHIFT 16
+#define ZYNQMP_DP_TX_VERSION_REVISION_MASK GENMASK(15, 12)
+#define ZYNQMP_DP_TX_VERSION_REVISION_SHIFT 12
+#define ZYNQMP_DP_TX_VERSION_PATCH_MASK GENMASK(11, 8)
+#define ZYNQMP_DP_TX_VERSION_PATCH_SHIFT 8
+#define ZYNQMP_DP_TX_VERSION_INTERNAL_MASK GENMASK(7, 0)
+#define ZYNQMP_DP_TX_VERSION_INTERNAL_SHIFT 0
+
+/* Core ID registers */
+#define ZYNQMP_DP_TX_CORE_ID 0xfc
+#define ZYNQMP_DP_TX_CORE_ID_MAJOR_MASK GENMASK(31, 24)
+#define ZYNQMP_DP_TX_CORE_ID_MAJOR_SHIFT 24
+#define ZYNQMP_DP_TX_CORE_ID_MINOR_MASK GENMASK(23, 16)
+#define ZYNQMP_DP_TX_CORE_ID_MINOR_SHIFT 16
+#define ZYNQMP_DP_TX_CORE_ID_REVISION_MASK GENMASK(15, 8)
+#define ZYNQMP_DP_TX_CORE_ID_REVISION_SHIFT 8
+#define ZYNQMP_DP_TX_CORE_ID_DIRECTION GENMASK(1)
+
+/* AUX channel interface registers */
+#define ZYNQMP_DP_TX_AUX_COMMAND 0x100
+#define ZYNQMP_DP_TX_AUX_COMMAND_CMD_SHIFT 8
+#define ZYNQMP_DP_TX_AUX_COMMAND_ADDRESS_ONLY BIT(12)
+#define ZYNQMP_DP_TX_AUX_COMMAND_BYTES_SHIFT 0
+#define ZYNQMP_DP_TX_AUX_WRITE_FIFO 0x104
+#define ZYNQMP_DP_TX_AUX_ADDRESS 0x108
+#define ZYNQMP_DP_TX_CLK_DIVIDER 0x10c
+#define ZYNQMP_DP_TX_CLK_DIVIDER_MHZ 1000000
+#define ZYNQMP_DP_TX_CLK_DIVIDER_AUX_FILTER_SHIFT 8
+#define ZYNQMP_DP_TX_INTR_SIGNAL_STATE 0x130
+#define ZYNQMP_DP_TX_INTR_SIGNAL_STATE_HPD BIT(0)
+#define ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REQUEST BIT(1)
+#define ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REPLY BIT(2)
+#define ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REPLY_TIMEOUT BIT(3)
+#define ZYNQMP_DP_TX_AUX_REPLY_DATA 0x134
+#define ZYNQMP_DP_TX_AUX_REPLY_CODE 0x138
+#define ZYNQMP_DP_TX_AUX_REPLY_CODE_AUX_ACK (0)
+#define ZYNQMP_DP_TX_AUX_REPLY_CODE_AUX_NACK BIT(0)
+#define ZYNQMP_DP_TX_AUX_REPLY_CODE_AUX_DEFER BIT(1)
+#define ZYNQMP_DP_TX_AUX_REPLY_CODE_I2C_ACK (0)
+#define ZYNQMP_DP_TX_AUX_REPLY_CODE_I2C_NACK BIT(2)
+#define ZYNQMP_DP_TX_AUX_REPLY_CODE_I2C_DEFER BIT(3)
+#define ZYNQMP_DP_TX_AUX_REPLY_CNT 0x13c
+#define ZYNQMP_DP_TX_AUX_REPLY_CNT_MASK 0xff
+#define ZYNQMP_DP_TX_INTR_STATUS 0x140
+#define ZYNQMP_DP_TX_INTR_MASK 0x144
+#define ZYNQMP_DP_TX_INTR_HPD_IRQ BIT(0)
+#define ZYNQMP_DP_TX_INTR_HPD_EVENT BIT(1)
+#define ZYNQMP_DP_TX_INTR_REPLY_RECV BIT(2)
+#define ZYNQMP_DP_TX_INTR_REPLY_TIMEOUT BIT(3)
+#define ZYNQMP_DP_TX_INTR_HPD_PULSE BIT(4)
+#define ZYNQMP_DP_TX_INTR_EXT_PKT_TXD BIT(5)
+#define ZYNQMP_DP_TX_INTR_LIV_ABUF_UNDRFLW BIT(12)
+#define ZYNQMP_DP_TX_INTR_VBLANK_START BIT(13)
+#define ZYNQMP_DP_TX_INTR_PIXEL0_MATCH BIT(14)
+#define ZYNQMP_DP_TX_INTR_PIXEL1_MATCH BIT(15)
+#define ZYNQMP_DP_TX_INTR_CHBUF_UNDERFLW_MASK 0x3f0000
+#define ZYNQMP_DP_TX_INTR_CHBUF_OVERFLW_MASK 0xfc00000
+#define ZYNQMP_DP_TX_INTR_CUST_TS_2 BIT(28)
+#define ZYNQMP_DP_TX_INTR_CUST_TS BIT(29)
+#define ZYNQMP_DP_TX_INTR_EXT_VSYNC_TS BIT(30)
+#define ZYNQMP_DP_TX_INTR_VSYNC_TS BIT(31)
+#define ZYNQMP_DP_TX_INTR_ALL (ZYNQMP_DP_TX_INTR_HPD_IRQ | \
+ ZYNQMP_DP_TX_INTR_HPD_EVENT | \
+ ZYNQMP_DP_TX_INTR_REPLY_RECV | \
+ ZYNQMP_DP_TX_INTR_REPLY_TIMEOUT | \
+ ZYNQMP_DP_TX_INTR_HPD_PULSE | \
+ ZYNQMP_DP_TX_INTR_EXT_PKT_TXD | \
+ ZYNQMP_DP_TX_INTR_LIV_ABUF_UNDRFLW | \
+ ZYNQMP_DP_TX_INTR_CHBUF_UNDERFLW_MASK | \
+ ZYNQMP_DP_TX_INTR_CHBUF_OVERFLW_MASK)
+#define ZYNQMP_DP_TX_NO_INTR_ALL (ZYNQMP_DP_TX_INTR_PIXEL0_MATCH | \
+ ZYNQMP_DP_TX_INTR_PIXEL1_MATCH | \
+ ZYNQMP_DP_TX_INTR_CUST_TS_2 | \
+ ZYNQMP_DP_TX_INTR_CUST_TS | \
+ ZYNQMP_DP_TX_INTR_EXT_VSYNC_TS | \
+ ZYNQMP_DP_TX_INTR_VSYNC_TS)
+#define ZYNQMP_DP_TX_REPLY_DATA_CNT 0x148
+#define ZYNQMP_DP_SUB_TX_INTR_STATUS 0x3a0
+#define ZYNQMP_DP_SUB_TX_INTR_MASK 0x3a4
+#define ZYNQMP_DP_SUB_TX_INTR_EN 0x3a8
+#define ZYNQMP_DP_SUB_TX_INTR_DS 0x3ac
+
+/* Main stream attribute registers */
+#define ZYNQMP_DP_TX_MAIN_STREAM_HTOTAL 0x180
+#define ZYNQMP_DP_TX_MAIN_STREAM_VTOTAL 0x184
+#define ZYNQMP_DP_TX_MAIN_STREAM_POLARITY 0x188
+#define ZYNQMP_DP_TX_MAIN_STREAM_POLARITY_HSYNC_SHIFT 0
+#define ZYNQMP_DP_TX_MAIN_STREAM_POLARITY_VSYNC_SHIFT 1
+#define ZYNQMP_DP_TX_MAIN_STREAM_HSWIDTH 0x18c
+#define ZYNQMP_DP_TX_MAIN_STREAM_VSWIDTH 0x190
+#define ZYNQMP_DP_TX_MAIN_STREAM_HRES 0x194
+#define ZYNQMP_DP_TX_MAIN_STREAM_VRES 0x198
+#define ZYNQMP_DP_TX_MAIN_STREAM_HSTART 0x19c
+#define ZYNQMP_DP_TX_MAIN_STREAM_VSTART 0x1a0
+#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0 0x1a4
+#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_SYNC BIT(0)
+#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_FORMAT_SHIFT 1
+#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_DYNAMIC_RANGE BIT(3)
+#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_YCBCR_COLRIMETRY BIT(4)
+#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_BPC_SHIFT 5
+#define ZYNQMP_DP_TX_MAIN_STREAM_MISC1 0x1a8
+#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_INTERLACED_VERT BIT(0)
+#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_STEREO_VID_SHIFT 1
+#define ZYNQMP_DP_TX_M_VID 0x1ac
+#define ZYNQMP_DP_TX_TRANSFER_UNIT_SIZE 0x1b0
+#define ZYNQMP_DP_TX_DEF_TRANSFER_UNIT_SIZE 64
+#define ZYNQMP_DP_TX_N_VID 0x1b4
+#define ZYNQMP_DP_TX_USER_PIXEL_WIDTH 0x1b8
+#define ZYNQMP_DP_TX_USER_DATA_CNT_PER_LANE 0x1bc
+#define ZYNQMP_DP_TX_MIN_BYTES_PER_TU 0x1c4
+#define ZYNQMP_DP_TX_FRAC_BYTES_PER_TU 0x1c8
+#define ZYNQMP_DP_TX_INIT_WAIT 0x1cc
+
+/* PHY configuration and status registers */
+#define ZYNQMP_DP_TX_PHY_CONFIG 0x200
+#define ZYNQMP_DP_TX_PHY_CONFIG_PHY_RESET BIT(0)
+#define ZYNQMP_DP_TX_PHY_CONFIG_GTTX_RESET BIT(1)
+#define ZYNQMP_DP_TX_PHY_CONFIG_PHY_PMA_RESET BIT(8)
+#define ZYNQMP_DP_TX_PHY_CONFIG_PHY_PCS_RESET BIT(9)
+#define ZYNQMP_DP_TX_PHY_CONFIG_ALL_RESET (ZYNQMP_DP_TX_PHY_CONFIG_PHY_RESET | \
+ ZYNQMP_DP_TX_PHY_CONFIG_GTTX_RESET | \
+ ZYNQMP_DP_TX_PHY_CONFIG_PHY_PMA_RESET | \
+ ZYNQMP_DP_TX_PHY_CONFIG_PHY_PCS_RESET)
+#define ZYNQMP_DP_TX_PHY_PREEMPHASIS_LANE_0 0x210
+#define ZYNQMP_DP_TX_PHY_PREEMPHASIS_LANE_1 0x214
+#define ZYNQMP_DP_TX_PHY_PREEMPHASIS_LANE_2 0x218
+#define ZYNQMP_DP_TX_PHY_PREEMPHASIS_LANE_3 0x21c
+#define ZYNQMP_DP_TX_PHY_VOLTAGE_DIFF_LANE_0 0x220
+#define ZYNQMP_DP_TX_PHY_VOLTAGE_DIFF_LANE_1 0x224
+#define ZYNQMP_DP_TX_PHY_VOLTAGE_DIFF_LANE_2 0x228
+#define ZYNQMP_DP_TX_PHY_VOLTAGE_DIFF_LANE_3 0x22c
+#define ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING 0x234
+#define ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_162 0x1
+#define ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_270 0x3
+#define ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_540 0x5
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN 0x238
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_0 BIT(0)
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_1 BIT(1)
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2 BIT(2)
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3 BIT(3)
+#define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL 0xf
+#define ZYNQMP_DP_TX_PHY_PRECURSOR_LANE_0 0x23c
+#define ZYNQMP_DP_TX_PHY_PRECURSOR_LANE_1 0x240
+#define ZYNQMP_DP_TX_PHY_PRECURSOR_LANE_2 0x244
+#define ZYNQMP_DP_TX_PHY_PRECURSOR_LANE_3 0x248
+#define ZYNQMP_DP_TX_PHY_POSTCURSOR_LANE_0 0x24c
+#define ZYNQMP_DP_TX_PHY_POSTCURSOR_LANE_1 0x250
+#define ZYNQMP_DP_TX_PHY_POSTCURSOR_LANE_2 0x254
+#define ZYNQMP_DP_TX_PHY_POSTCURSOR_LANE_3 0x258
+#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 0x24c
+#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_1 0x250
+#define ZYNQMP_DP_TX_PHY_STATUS 0x280
+#define ZYNQMP_DP_TX_PHY_STATUS_PLL_LOCKED_SHIFT 4
+#define ZYNQMP_DP_TX_PHY_STATUS_FPGA_PLL_LOCKED BIT(6)
+
+/* Audio registers */
+#define ZYNQMP_DP_TX_AUDIO_CONTROL 0x300
+#define ZYNQMP_DP_TX_AUDIO_CHANNELS 0x304
+#define ZYNQMP_DP_TX_AUDIO_INFO_DATA 0x308
+#define ZYNQMP_DP_TX_AUDIO_M_AUD 0x328
+#define ZYNQMP_DP_TX_AUDIO_N_AUD 0x32c
+#define ZYNQMP_DP_TX_AUDIO_EXT_DATA 0x330
+
+#define ZYNQMP_DP_MISC0_RGB (0)
+#define ZYNQMP_DP_MISC0_YCRCB_422 (5 << 1)
+#define ZYNQMP_DP_MISC0_YCRCB_444 (6 << 1)
+#define ZYNQMP_DP_MISC0_FORMAT_MASK 0xe
+#define ZYNQMP_DP_MISC0_BPC_6 (0 << 5)
+#define ZYNQMP_DP_MISC0_BPC_8 (1 << 5)
+#define ZYNQMP_DP_MISC0_BPC_10 (2 << 5)
+#define ZYNQMP_DP_MISC0_BPC_12 (3 << 5)
+#define ZYNQMP_DP_MISC0_BPC_16 (4 << 5)
+#define ZYNQMP_DP_MISC0_BPC_MASK 0xe0
+#define ZYNQMP_DP_MISC1_Y_ONLY (1 << 7)
+
+#define ZYNQMP_DP_MAX_LANES 2
+#define ZYNQMP_MAX_FREQ 3000000
+
+#define DP_REDUCED_BIT_RATE 162000
+#define DP_HIGH_BIT_RATE 270000
+#define DP_HIGH_BIT_RATE2 540000
+#define DP_MAX_TRAINING_TRIES 5
+#define DP_V1_2 0x12
+
+/**
+ * struct zynqmp_dp_link_config - Common link config between source and sink
+ * @max_rate: maximum link rate
+ * @max_lanes: maximum number of lanes
+ */
+struct zynqmp_dp_link_config {
+ int max_rate;
+ u8 max_lanes;
+};
+
+/**
+ * struct zynqmp_dp_mode - Configured mode of DisplayPort
+ * @bw_code: code for bandwidth(link rate)
+ * @lane_cnt: number of lanes
+ * @pclock: pixel clock frequency of current mode
+ * @fmt: format identifier string
+ */
+struct zynqmp_dp_mode {
+ u8 bw_code;
+ u8 lane_cnt;
+ int pclock;
+ const char *fmt;
+};
+
+/**
+ * struct zynqmp_dp_config - Configuration of DisplayPort from DTS
+ * @misc0: misc0 configuration (per DP v1.2 spec)
+ * @misc1: misc1 configuration (per DP v1.2 spec)
+ * @bpp: bits per pixel
+ * @bpc: bits per component
+ * @num_colors: number of color components
+ */
+struct zynqmp_dp_config {
+ u8 misc0;
+ u8 misc1;
+ u8 bpp;
+ u8 bpc;
+ u8 num_colors;
+};
+
+/**
+ * struct zynqmp_dp - Xilinx DisplayPort core
+ * @encoder: the drm encoder structure
+ * @connector: the drm connector structure
+ * @dev: device structure
+ * @dpsub: Display subsystem
+ * @drm: DRM core
+ * @iomem: device I/O memory for register access
+ * @irq: irq
+ * @config: IP core configuration from DTS
+ * @aux: aux channel
+ * @phy: PHY handles for DP lanes
+ * @num_lanes: number of enabled phy lanes
+ * @hpd_work: hot plug detection worker
+ * @status: connection status
+ * @enabled: flag to indicate if the device is enabled
+ * @dpms: current dpms state
+ * @dpcd: DP configuration data from currently connected sink device
+ * @link_config: common link configuration between IP core and sink device
+ * @mode: current mode between IP core and sink device
+ * @train_set: set of training data
+ */
+struct zynqmp_dp {
+ struct drm_encoder encoder;
+ struct drm_connector connector;
+ struct device *dev;
+ struct zynqmp_dpsub *dpsub;
+ struct drm_device *drm;
+ void __iomem *iomem;
+ int irq;
+
+ struct zynqmp_dp_config config;
+ struct drm_dp_aux aux;
+ struct phy *phy[ZYNQMP_DP_MAX_LANES];
+ u8 num_lanes;
+ struct delayed_work hpd_work;
+ enum drm_connector_status status;
+ bool enabled;
+
+ int dpms;
+ u8 dpcd[DP_RECEIVER_CAP_SIZE];
+ struct zynqmp_dp_link_config link_config;
+ struct zynqmp_dp_mode mode;
+ u8 train_set[ZYNQMP_DP_MAX_LANES];
+};
+
+static inline struct zynqmp_dp *encoder_to_dp(struct drm_encoder *encoder)
+{
+ return container_of(encoder, struct zynqmp_dp, encoder);
+}
+
+static inline struct zynqmp_dp *connector_to_dp(struct drm_connector *connector)
+{
+ return container_of(connector, struct zynqmp_dp, connector);
+}
+
+static void zynqmp_dp_write(void __iomem *base, int offset, u32 val)
+{
+ writel(val, base + offset);
+}
+
+static u32 zynqmp_dp_read(void __iomem *base, int offset)
+{
+ return readl(base + offset);
+}
+
+static void zynqmp_dp_clr(void __iomem *base, int offset, u32 clr)
+{
+ zynqmp_dp_write(base, offset, zynqmp_dp_read(base, offset) & ~clr);
+}
+
+static void zynqmp_dp_set(void __iomem *base, int offset, u32 set)
+{
+ zynqmp_dp_write(base, offset, zynqmp_dp_read(base, offset) | set);
+}
+
+/*
+ * Internal functions: used by zynqmp_disp.c
+ */
+
+/**
+ * zynqmp_dp_update_bpp - Update the current bpp config
+ * @dp: DisplayPort IP core structure
+ *
+ * Update the current bpp based on the color format: bpc & num_colors.
+ * Any function that changes bpc or num_colors should call this
+ * to keep the bpp value in sync.
+ */
+static void zynqmp_dp_update_bpp(struct zynqmp_dp *dp)
+{
+ struct zynqmp_dp_config *config = &dp->config;
+
+ config->bpp = dp->config.bpc * dp->config.num_colors;
+}
+
+/**
+ * zynqmp_dp_set_color - Set the color
+ * @dp: DisplayPort IP core structure
+ * @color: color string, from zynqmp_disp_color_enum
+ *
+ * Update misc register values based on @color string.
+ *
+ * Return: 0 on success, or -EINVAL.
+ */
+int zynqmp_dp_set_color(struct zynqmp_dp *dp, const char *color)
+{
+ struct zynqmp_dp_config *config = &dp->config;
+
+ config->misc0 &= ~ZYNQMP_DP_MISC0_FORMAT_MASK;
+ config->misc1 &= ~ZYNQMP_DP_MISC1_Y_ONLY;
+ if (strcmp(color, "rgb") == 0) {
+ config->misc0 |= ZYNQMP_DP_MISC0_RGB;
+ config->num_colors = 3;
+ } else if (strcmp(color, "ycrcb422") == 0) {
+ config->misc0 |= ZYNQMP_DP_MISC0_YCRCB_422;
+ config->num_colors = 2;
+ } else if (strcmp(color, "ycrcb444") == 0) {
+ config->misc0 |= ZYNQMP_DP_MISC0_YCRCB_444;
+ config->num_colors = 3;
+ } else if (strcmp(color, "yonly") == 0) {
+ config->misc1 |= ZYNQMP_DP_MISC1_Y_ONLY;
+ config->num_colors = 1;
+ } else {
+ dev_err(dp->dev, "Invalid colormetry in DT\n");
+ return -EINVAL;
+ }
+ zynqmp_dp_update_bpp(dp);
+
+ return 0;
+}
+
+/**
+ * zynqmp_dp_enable_vblank - Enable vblank
+ * @dp: DisplayPort IP core structure
+ *
+ * Enable vblank interrupt
+ */
+void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp)
+{
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_EN,
+ ZYNQMP_DP_TX_INTR_VBLANK_START);
+}
+
+/**
+ * zynqmp_dp_disable_vblank - Disable vblank
+ * @dp: DisplayPort IP core structure
+ *
+ * Disable vblank interrupt
+ */
+void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp)
+{
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_DS,
+ ZYNQMP_DP_TX_INTR_VBLANK_START);
+}
+
+/*
+ * DP PHY functions
+ */
+
+/**
+ * zynqmp_dp_init_phy - Initialize the phy
+ * @dp: DisplayPort IP core structure
+ *
+ * Initialize the phy.
+ *
+ * Return: 0 if the phy instances are initialized correctly, or the error code
+ * returned from the callee functions.
+ */
+static int zynqmp_dp_init_phy(struct zynqmp_dp *dp)
+{
+ unsigned int i;
+ int ret;
+
+ for (i = 0; i < dp->num_lanes; i++) {
+ ret = phy_init(dp->phy[i]);
+ if (ret) {
+ dev_err(dp->dev, "failed to init phy lane %d\n", i);
+ return ret;
+ }
+ }
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_DS,
+ ZYNQMP_DP_TX_INTR_ALL);
+ zynqmp_dp_clr(dp->iomem, ZYNQMP_DP_TX_PHY_CONFIG,
+ ZYNQMP_DP_TX_PHY_CONFIG_ALL_RESET);
+
+ return 0;
+}
+
+/**
+ * zynqmp_dp_exit_phy - Exit the phy
+ * @dp: DisplayPort IP core structure
+ *
+ * Exit the phy.
+ */
+static void zynqmp_dp_exit_phy(struct zynqmp_dp *dp)
+{
+ unsigned int i;
+ int ret;
+
+ for (i = 0; i < dp->num_lanes; i++) {
+ ret = phy_exit(dp->phy[i]);
+ if (ret)
+ dev_err(dp->dev, "failed to exit phy(%d) %d\n", i, ret);
+ }
+}
+
+/**
+ * zynqmp_dp_phy_ready - Check if PHY is ready
+ * @dp: DisplayPort IP core structure
+ *
+ * Check if PHY is ready. If PHY is not ready, wait 1ms to check for 100 times.
+ * This amount of delay was suggested by IP designer.
+ *
+ * Return: 0 if PHY is ready, or -ENODEV if PHY is not ready.
+ */
+static int zynqmp_dp_phy_ready(struct zynqmp_dp *dp)
+{
+ u32 i, reg, ready;
+
+ ready = (1 << dp->num_lanes) - 1;
+
+ /* Wait for 100 * 1ms. This should be enough time for PHY to be ready */
+ for (i = 0; ; i++) {
+ reg = zynqmp_dp_read(dp->iomem, ZYNQMP_DP_TX_PHY_STATUS);
+ if ((reg & ready) == ready)
+ return 0;
+
+ if (i == 100) {
+ dev_err(dp->dev, "PHY isn't ready\n");
+ return -ENODEV;
+ }
+
+ usleep_range(1000, 1100);
+ }
+
+ return 0;
+}
+
+/*
+ * DP functions
+ */
+
+/**
+ * zynqmp_dp_max_rate - Calculate and return available max pixel clock
+ * @link_rate: link rate (Kilo-bytes / sec)
+ * @lane_num: number of lanes
+ * @bpp: bits per pixel
+ *
+ * Return: max pixel clock (KHz) supported by current link config.
+ */
+static inline int zynqmp_dp_max_rate(int link_rate, u8 lane_num, u8 bpp)
+{
+ return link_rate * lane_num * 8 / bpp;
+}
+
+/**
+ * zynqmp_dp_mode_configure - Configure the link values
+ * @dp: DisplayPort IP core structure
+ * @pclock: pixel clock for requested display mode
+ * @current_bw: current link rate
+ *
+ * Find the link configuration values, rate and lane count for requested pixel
+ * clock @pclock. The @pclock is stored in the mode to be used in other
+ * functions later. The returned rate is downshifted from the current rate
+ * @current_bw.
+ *
+ * Return: Current link rate code, or -EINVAL.
+ */
+static int zynqmp_dp_mode_configure(struct zynqmp_dp *dp, int pclock,
+ u8 current_bw)
+{
+ int max_rate = dp->link_config.max_rate;
+ u8 bws[3] = { DP_LINK_BW_1_62, DP_LINK_BW_2_7, DP_LINK_BW_5_4 };
+ u8 max_lanes = dp->link_config.max_lanes;
+ u8 max_link_rate_code = drm_dp_link_rate_to_bw_code(max_rate);
+ u8 bpp = dp->config.bpp;
+ u8 lane_cnt;
+ s8 i;
+
+ if (current_bw == DP_LINK_BW_1_62) {
+ dev_err(dp->dev, "can't downshift. already lowest link rate\n");
+ return -EINVAL;
+ }
+
+ for (i = ARRAY_SIZE(bws) - 1; i >= 0; i--) {
+ if (current_bw && bws[i] >= current_bw)
+ continue;
+
+ if (bws[i] <= max_link_rate_code)
+ break;
+ }
+
+ for (lane_cnt = 1; lane_cnt <= max_lanes; lane_cnt <<= 1) {
+ int bw;
+ u32 rate;
+
+ bw = drm_dp_bw_code_to_link_rate(bws[i]);
+ rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp);
+ if (pclock <= rate) {
+ dp->mode.bw_code = bws[i];
+ dp->mode.lane_cnt = lane_cnt;
+ dp->mode.pclock = pclock;
+ return dp->mode.bw_code;
+ }
+ }
+
+ dev_err(dp->dev, "failed to configure link values\n");
+
+ return -EINVAL;
+}
+
+/**
+ * zynqmp_dp_adjust_train - Adjust train values
+ * @dp: DisplayPort IP core structure
+ * @link_status: link status from sink which contains requested training values
+ */
+static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp,
+ u8 link_status[DP_LINK_STATUS_SIZE])
+{
+ u8 *train_set = dp->train_set;
+ u8 voltage = 0, preemphasis = 0;
+ u8 i;
+
+ for (i = 0; i < dp->mode.lane_cnt; i++) {
+ u8 v = drm_dp_get_adjust_request_voltage(link_status, i);
+ u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
+
+ if (v > voltage)
+ voltage = v;
+
+ if (p > preemphasis)
+ preemphasis = p;
+ }
+
+ if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
+ voltage |= DP_TRAIN_MAX_SWING_REACHED;
+
+ if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2)
+ preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
+
+ for (i = 0; i < dp->mode.lane_cnt; i++)
+ train_set[i] = voltage | preemphasis;
+}
+
+/**
+ * zynqmp_dp_update_vs_emph - Update the training values
+ * @dp: DisplayPort IP core structure
+ *
+ * Update the training values based on the request from sink. The mapped values
+ * are predefined, and values(vs, pe, pc) are from the device manual.
+ *
+ * Return: 0 if vs and emph are updated successfully, or the error code returned
+ * by drm_dp_dpcd_write().
+ */
+static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp)
+{
+ u8 *train_set = dp->train_set;
+ u8 i, v_level, p_level;
+ int ret;
+
+ ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, train_set,
+ dp->mode.lane_cnt);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < dp->mode.lane_cnt; i++) {
+ u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4;
+
+ v_level = (train_set[i] & DP_TRAIN_VOLTAGE_SWING_MASK) >>
+ DP_TRAIN_VOLTAGE_SWING_SHIFT;
+ p_level = (train_set[i] & DP_TRAIN_PRE_EMPHASIS_MASK) >>
+ DP_TRAIN_PRE_EMPHASIS_SHIFT;
+
+ zynqmp_dp_write(dp->iomem, reg, 0x2);
+ }
+
+ return 0;
+}
+
+/**
+ * zynqmp_dp_link_train_cr - Train clock recovery
+ * @dp: DisplayPort IP core structure
+ *
+ * Return: 0 if clock recovery train is done successfully, or corresponding
+ * error code.
+ */
+static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp)
+{
+ u8 link_status[DP_LINK_STATUS_SIZE];
+ u8 lane_cnt = dp->mode.lane_cnt;
+ u8 vs = 0, tries = 0;
+ u16 max_tries, i;
+ bool cr_done;
+ int ret;
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_1);
+ ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_1 |
+ DP_LINK_SCRAMBLING_DISABLE);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * 256 loops should be maximum iterations for 4 lanes and 4 values.
+ * So, This loop should exit before 512 iterations
+ */
+ for (max_tries = 0; max_tries < 512; max_tries++) {
+ ret = zynqmp_dp_update_vs_emph(dp);
+ if (ret)
+ return ret;
+
+ drm_dp_link_train_clock_recovery_delay(dp->dpcd);
+ ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
+ if (ret < 0)
+ return ret;
+
+ cr_done = drm_dp_clock_recovery_ok(link_status, lane_cnt);
+ if (cr_done)
+ break;
+
+ for (i = 0; i < lane_cnt; i++)
+ if (!(dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED))
+ break;
+ if (i == lane_cnt)
+ break;
+
+ if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == vs)
+ tries++;
+ else
+ tries = 0;
+
+ if (tries == DP_MAX_TRAINING_TRIES)
+ break;
+
+ vs = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
+ zynqmp_dp_adjust_train(dp, link_status);
+ }
+
+ if (!cr_done)
+ return -EIO;
+
+ return 0;
+}
+
+/**
+ * zynqmp_dp_link_train_ce - Train channel equalization
+ * @dp: DisplayPort IP core structure
+ *
+ * Return: 0 if channel equalization train is done successfully, or
+ * corresponding error code.
+ */
+static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp)
+{
+ u8 link_status[DP_LINK_STATUS_SIZE];
+ u8 lane_cnt = dp->mode.lane_cnt;
+ u32 pat, tries;
+ int ret;
+ bool ce_done;
+
+ if (dp->dpcd[DP_DPCD_REV] >= DP_V1_2 &&
+ dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED)
+ pat = DP_TRAINING_PATTERN_3;
+ else
+ pat = DP_TRAINING_PATTERN_2;
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_TRAINING_PATTERN_SET, pat);
+ ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
+ pat | DP_LINK_SCRAMBLING_DISABLE);
+ if (ret < 0)
+ return ret;
+
+ for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) {
+ ret = zynqmp_dp_update_vs_emph(dp);
+ if (ret)
+ return ret;
+
+ drm_dp_link_train_channel_eq_delay(dp->dpcd);
+ ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
+ if (ret < 0)
+ return ret;
+
+ ce_done = drm_dp_channel_eq_ok(link_status, lane_cnt);
+ if (ce_done)
+ break;
+
+ zynqmp_dp_adjust_train(dp, link_status);
+ }
+
+ if (!ce_done)
+ return -EIO;
+
+ return 0;
+}
+
+/**
+ * zynqmp_dp_link_train - Train the link
+ * @dp: DisplayPort IP core structure
+ *
+ * Return: 0 if all trains are done successfully, or corresponding error code.
+ */
+static int zynqmp_dp_train(struct zynqmp_dp *dp)
+{
+ u32 reg;
+ u8 bw_code = dp->mode.bw_code;
+ u8 lane_cnt = dp->mode.lane_cnt;
+ u8 aux_lane_cnt = lane_cnt;
+ bool enhanced;
+ int ret;
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_LANE_CNT_SET, lane_cnt);
+ enhanced = drm_dp_enhanced_frame_cap(dp->dpcd);
+ if (enhanced) {
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_ENHANCED_FRAME_EN, 1);
+ aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
+ }
+
+ if (dp->dpcd[3] & 0x1) {
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_DOWNSPREAD_CTL, 1);
+ drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL,
+ DP_SPREAD_AMP_0_5);
+ } else {
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_DOWNSPREAD_CTL, 0);
+ drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 0);
+ }
+
+ ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, aux_lane_cnt);
+ if (ret < 0) {
+ dev_err(dp->dev, "failed to set lane count\n");
+ return ret;
+ }
+
+ ret = drm_dp_dpcd_writeb(&dp->aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
+ DP_SET_ANSI_8B10B);
+ if (ret < 0) {
+ dev_err(dp->dev, "failed to set ANSI 8B/10B encoding\n");
+ return ret;
+ }
+
+ ret = drm_dp_dpcd_writeb(&dp->aux, DP_LINK_BW_SET, bw_code);
+ if (ret < 0) {
+ dev_err(dp->dev, "failed to set DP bandwidth\n");
+ return ret;
+ }
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_LINK_BW_SET, bw_code);
+ switch (bw_code) {
+ case DP_LINK_BW_1_62:
+ reg = ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_162;
+ break;
+ case DP_LINK_BW_2_7:
+ reg = ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_270;
+ break;
+ case DP_LINK_BW_5_4:
+ default:
+ reg = ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_540;
+ break;
+ }
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING,
+ reg);
+ ret = zynqmp_dp_phy_ready(dp);
+ if (ret < 0)
+ return ret;
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_SCRAMBLING_DISABLE, 1);
+ memset(dp->train_set, 0, 4);
+ ret = zynqmp_dp_link_train_cr(dp);
+ if (ret)
+ return ret;
+
+ ret = zynqmp_dp_link_train_ce(dp);
+ if (ret)
+ return ret;
+
+ ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_DISABLE);
+ if (ret < 0) {
+ dev_err(dp->dev, "failed to disable training pattern\n");
+ return ret;
+ }
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_DISABLE);
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_SCRAMBLING_DISABLE, 0);
+
+ return 0;
+}
+
+/**
+ * zynqmp_dp_train_loop - Downshift the link rate during training
+ * @dp: DisplayPort IP core structure
+ *
+ * Train the link by downshifting the link rate if training is not successful.
+ */
+static void zynqmp_dp_train_loop(struct zynqmp_dp *dp)
+{
+ struct zynqmp_dp_mode *mode = &dp->mode;
+ u8 bw = mode->bw_code;
+ int ret;
+
+ do {
+ if (dp->status == connector_status_disconnected ||
+ !dp->enabled)
+ return;
+
+ ret = zynqmp_dp_train(dp);
+ if (!ret)
+ return;
+
+ ret = zynqmp_dp_mode_configure(dp, mode->pclock, bw);
+ if (ret < 0)
+ goto err_out;
+
+ bw = ret;
+ } while (bw >= DP_LINK_BW_1_62);
+
+err_out:
+ dev_err(dp->dev, "failed to train the DP link\n");
+}
+
+/*
+ * DP Aux functions
+ */
+
+#define AUX_READ_BIT 0x1
+
+/**
+ * zynqmp_dp_aux_cmd_submit - Submit aux command
+ * @dp: DisplayPort IP core structure
+ * @cmd: aux command
+ * @addr: aux address
+ * @buf: buffer for command data
+ * @bytes: number of bytes for @buf
+ * @reply: reply code to be returned
+ *
+ * Submit an aux command. All aux related commands, native or i2c aux
+ * read/write, are submitted through this function. The function is mapped to
+ * the transfer function of struct drm_dp_aux. This function involves in
+ * multiple register reads/writes, thus synchronization is needed, and it is
+ * done by drm_dp_helper using @hw_mutex. The calling thread goes into sleep
+ * if there's no immediate reply to the command submission. The reply code is
+ * returned at @reply if @reply != NULL.
+ *
+ * Return: 0 if the command is submitted properly, or corresponding error code:
+ * -EBUSY when there is any request already being processed
+ * -ETIMEDOUT when receiving reply is timed out
+ * -EIO when received bytes are less than requested
+ */
+static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr,
+ u8 *buf, u8 bytes, u8 *reply)
+{
+ bool is_read = (cmd & AUX_READ_BIT) ? true : false;
+ void __iomem *iomem = dp->iomem;
+ u32 reg, i;
+
+ reg = zynqmp_dp_read(iomem, ZYNQMP_DP_TX_INTR_SIGNAL_STATE);
+ if (reg & ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REQUEST)
+ return -EBUSY;
+
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUX_ADDRESS, addr);
+ if (!is_read)
+ for (i = 0; i < bytes; i++)
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUX_WRITE_FIFO,
+ buf[i]);
+
+ reg = cmd << ZYNQMP_DP_TX_AUX_COMMAND_CMD_SHIFT;
+ if (!buf || !bytes)
+ reg |= ZYNQMP_DP_TX_AUX_COMMAND_ADDRESS_ONLY;
+ else
+ reg |= (bytes - 1) << ZYNQMP_DP_TX_AUX_COMMAND_BYTES_SHIFT;
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUX_COMMAND, reg);
+
+ /* Wait for reply to be delivered upto 2ms */
+ for (i = 0; ; i++) {
+ reg = zynqmp_dp_read(iomem, ZYNQMP_DP_TX_INTR_SIGNAL_STATE);
+ if (reg & ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REPLY)
+ break;
+
+ if (reg & ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REPLY_TIMEOUT ||
+ i == 2)
+ return -ETIMEDOUT;
+
+ usleep_range(1000, 1100);
+ }
+
+ reg = zynqmp_dp_read(iomem, ZYNQMP_DP_TX_AUX_REPLY_CODE);
+ if (reply)
+ *reply = reg;
+
+ if (is_read &&
+ (reg == ZYNQMP_DP_TX_AUX_REPLY_CODE_AUX_ACK ||
+ reg == ZYNQMP_DP_TX_AUX_REPLY_CODE_I2C_ACK)) {
+ reg = zynqmp_dp_read(iomem, ZYNQMP_DP_TX_REPLY_DATA_CNT);
+ if ((reg & ZYNQMP_DP_TX_AUX_REPLY_CNT_MASK) != bytes)
+ return -EIO;
+
+ for (i = 0; i < bytes; i++) {
+ buf[i] = zynqmp_dp_read(iomem,
+ ZYNQMP_DP_TX_AUX_REPLY_DATA);
+ }
+ }
+
+ return 0;
+}
+
+static ssize_t
+zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
+{
+ struct zynqmp_dp *dp = container_of(aux, struct zynqmp_dp, aux);
+ int ret;
+ unsigned int i, iter;
+
+ /* Number of loops = timeout in msec / aux delay (400 usec) */
+ iter = zynqmp_dp_aux_timeout_ms * 1000 / 400;
+ iter = iter ? iter : 1;
+
+ for (i = 0; i < iter; i++) {
+ ret = zynqmp_dp_aux_cmd_submit(dp, msg->request, msg->address,
+ msg->buffer, msg->size,
+ &msg->reply);
+ if (!ret) {
+ dev_dbg(dp->dev, "aux %d retries\n", i);
+ return msg->size;
+ }
+
+ if (dp->status == connector_status_disconnected) {
+ dev_dbg(dp->dev, "no connected aux device\n");
+ return -ENODEV;
+ }
+
+ usleep_range(400, 500);
+ }
+
+ dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret);
+
+ return ret;
+}
+
+/**
+ * zynqmp_dp_init_aux - Initialize the DP aux
+ * @dp: DisplayPort IP core structure
+ *
+ * Initialize the DP aux. The aux clock is derived from the axi clock, so
+ * this function gets the axi clock frequency and calculates the filter
+ * value. Additionally, the interrupts and transmitter are enabled.
+ *
+ * Return: 0 on success, error value otherwise
+ */
+static int zynqmp_dp_init_aux(struct zynqmp_dp *dp)
+{
+ unsigned int rate;
+ u32 reg, w;
+
+ rate = zynqmp_disp_get_apb_clk_rate(dp->dpsub->disp);
+ if (rate < ZYNQMP_DP_TX_CLK_DIVIDER_MHZ) {
+ dev_err(dp->dev, "aclk should be higher than 1MHz\n");
+ return -EINVAL;
+ }
+
+ /* Allowable values for this register are: 8, 16, 24, 32, 40, 48 */
+ for (w = 8; w <= 48; w += 8) {
+ /* AUX pulse width should be between 0.4 to 0.6 usec */
+ if (w >= (4 * rate / 10000000) &&
+ w <= (6 * rate / 10000000))
+ break;
+ }
+
+ if (w > 48) {
+ dev_err(dp->dev, "aclk frequency too high\n");
+ return -EINVAL;
+ }
+ reg = w << ZYNQMP_DP_TX_CLK_DIVIDER_AUX_FILTER_SHIFT;
+ reg |= rate / ZYNQMP_DP_TX_CLK_DIVIDER_MHZ;
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_CLK_DIVIDER, reg);
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_EN,
+ ZYNQMP_DP_TX_INTR_ALL);
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_DS,
+ ZYNQMP_DP_TX_NO_INTR_ALL);
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_ENABLE, 1);
+
+ return 0;
+}
+
+/**
+ * zynqmp_dp_exit_aux - De-initialize the DP aux
+ * @dp: DisplayPort IP core structure
+ *
+ * De-initialize the DP aux. Disable all interrupts which are enabled
+ * through aux initialization, as well as the transmitter.
+ */
+static void zynqmp_dp_exit_aux(struct zynqmp_dp *dp)
+{
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_ENABLE, 0);
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_DS, 0xffffffff);
+}
+
+/*
+ * Generic DP functions
+ */
+
+/**
+ * zynqmp_dp_update_misc - Write the misc registers
+ * @dp: DisplayPort IP core structure
+ *
+ * The misc register values are stored in the structure, and this
+ * function applies the values into the registers.
+ */
+static void zynqmp_dp_update_misc(struct zynqmp_dp *dp)
+{
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_MAIN_STREAM_MISC0,
+ dp->config.misc0);
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_MAIN_STREAM_MISC1,
+ dp->config.misc1);
+}
+
+/**
+ * zynqmp_dp_set_bpc - Set bpc value in software misc state
+ * @dp: DisplayPort IP core structure
+ * @bpc: bits per component
+ *
+ * Return: 0 on success, or the fallback bpc value
+ */
+static u8 zynqmp_dp_set_bpc(struct zynqmp_dp *dp, u8 bpc)
+{
+ struct zynqmp_dp_config *config = &dp->config;
+ u8 ret = 0;
+
+ if (dp->connector.display_info.bpc &&
+ dp->connector.display_info.bpc != bpc) {
+ dev_err(dp->dev, "requested bpc (%u) != display info (%u)\n",
+ bpc, dp->connector.display_info.bpc);
+ bpc = dp->connector.display_info.bpc;
+ }
+
+ config->misc0 &= ~ZYNQMP_DP_MISC0_BPC_MASK;
+ switch (bpc) {
+ case 6:
+ config->misc0 |= ZYNQMP_DP_MISC0_BPC_6;
+ break;
+ case 8:
+ config->misc0 |= ZYNQMP_DP_MISC0_BPC_8;
+ break;
+ case 10:
+ config->misc0 |= ZYNQMP_DP_MISC0_BPC_10;
+ break;
+ case 12:
+ config->misc0 |= ZYNQMP_DP_MISC0_BPC_12;
+ break;
+ case 16:
+ config->misc0 |= ZYNQMP_DP_MISC0_BPC_16;
+ break;
+ default:
+ dev_err(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n",
+ bpc);
+ config->misc0 |= ZYNQMP_DP_MISC0_BPC_8;
+ ret = 8;
+ break;
+ }
+ config->bpc = bpc;
+ zynqmp_dp_update_bpp(dp);
+
+ return ret;
+}
+
+/**
+ * zynqmp_dp_encoder_mode_set_transfer_unit - Set the transfer unit values
+ * @dp: DisplayPort IP core structure
+ * @mode: requested display mode
+ *
+ * Set the transfer unit, and caculate all transfer unit size related values.
+ * Calculation is based on DP and IP core specification.
+ */
+static void
+zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp *dp,
+ struct drm_display_mode *mode)
+{
+ u32 tu = ZYNQMP_DP_TX_DEF_TRANSFER_UNIT_SIZE;
+ u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait;
+
+ /* Use the max transfer unit size (default) */
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_TRANSFER_UNIT_SIZE, tu);
+
+ vid_kbytes = mode->clock * (dp->config.bpp / 8);
+ bw = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
+ avg_bytes_per_tu = vid_kbytes * tu / (dp->mode.lane_cnt * bw / 1000);
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_MIN_BYTES_PER_TU,
+ avg_bytes_per_tu / 1000);
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_FRAC_BYTES_PER_TU,
+ avg_bytes_per_tu % 1000);
+
+ /* Configure the initial wait cycle based on transfer unit size */
+ if (tu < (avg_bytes_per_tu / 1000))
+ init_wait = 0;
+ else if ((avg_bytes_per_tu / 1000) <= 4)
+ init_wait = tu;
+ else
+ init_wait = tu - avg_bytes_per_tu / 1000;
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_INIT_WAIT, init_wait);
+}
+
+/**
+ * zynqmp_dp_encoder_mode_set_stream - Configure the main stream
+ * @dp: DisplayPort IP core structure
+ * @mode: requested display mode
+ *
+ * Configure the main stream based on the requested mode @mode. Calculation is
+ * based on IP core specification.
+ */
+void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp,
+ struct drm_display_mode *mode)
+{
+ void __iomem *iomem = dp->iomem;
+ u8 lane_cnt = dp->mode.lane_cnt;
+ u32 reg, wpl;
+ unsigned int rate;
+
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_HTOTAL, mode->htotal);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_VTOTAL, mode->vtotal);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_POLARITY,
+ (!!(mode->flags & DRM_MODE_FLAG_PVSYNC) <<
+ ZYNQMP_DP_TX_MAIN_STREAM_POLARITY_VSYNC_SHIFT) |
+ (!!(mode->flags & DRM_MODE_FLAG_PHSYNC) <<
+ ZYNQMP_DP_TX_MAIN_STREAM_POLARITY_HSYNC_SHIFT));
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_HSWIDTH,
+ mode->hsync_end - mode->hsync_start);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_VSWIDTH,
+ mode->vsync_end - mode->vsync_start);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_HRES, mode->hdisplay);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_VRES, mode->vdisplay);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_HSTART,
+ mode->htotal - mode->hsync_start);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_VSTART,
+ mode->vtotal - mode->vsync_start);
+
+ /* In synchronous mode, set the diviers */
+ if (dp->config.misc0 & ZYNQMP_DP_TX_MAIN_STREAM_MISC0_SYNC) {
+ reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_N_VID, reg);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_M_VID, mode->clock);
+ rate = zynqmp_disp_get_aud_clk_rate(dp->dpsub->disp);
+ if (rate) {
+ dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_N_AUD, reg);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_M_AUD,
+ rate / 1000);
+ }
+ }
+
+ /* Only 2 channel audio is supported now */
+ if (zynqmp_disp_aud_enabled(dp->dpsub->disp))
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1);
+
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_USER_PIXEL_WIDTH, 1);
+
+ /* Translate to the native 16 bit datapath based on IP core spec */
+ wpl = (mode->hdisplay * dp->config.bpp + 15) / 16;
+ reg = wpl + wpl % lane_cnt - lane_cnt;
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_USER_DATA_CNT_PER_LANE, reg);
+}
+
+/*
+ * DRM connector functions
+ */
+
+static enum drm_connector_status
+zynqmp_dp_connector_detect(struct drm_connector *connector, bool force)
+{
+ struct zynqmp_dp *dp = connector_to_dp(connector);
+ struct zynqmp_dp_link_config *link_config = &dp->link_config;
+ u32 state, i;
+ int ret;
+
+ /*
+ * This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to
+ * get the HPD signal with some monitors.
+ */
+ for (i = 0; i < 10; i++) {
+ state = zynqmp_dp_read(dp->iomem,
+ ZYNQMP_DP_TX_INTR_SIGNAL_STATE);
+ if (state & ZYNQMP_DP_TX_INTR_SIGNAL_STATE_HPD)
+ break;
+ msleep(100);
+ }
+
+ if (state & ZYNQMP_DP_TX_INTR_SIGNAL_STATE_HPD) {
+ ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd,
+ sizeof(dp->dpcd));
+ if (ret < 0) {
+ dev_dbg(dp->dev, "DPCD read failes");
+ goto disconnected;
+ }
+
+ link_config->max_rate = min_t(int,
+ drm_dp_max_link_rate(dp->dpcd),
+ DP_HIGH_BIT_RATE2);
+ link_config->max_lanes = min_t(u8,
+ drm_dp_max_lane_count(dp->dpcd),
+ dp->num_lanes);
+
+ dp->status = connector_status_connected;
+ return connector_status_connected;
+ }
+
+disconnected:
+ dp->status = connector_status_disconnected;
+ return connector_status_disconnected;
+}
+
+static int zynqmp_dp_connector_get_modes(struct drm_connector *connector)
+{
+ struct zynqmp_dp *dp = connector_to_dp(connector);
+ struct edid *edid;
+ int ret;
+
+ edid = drm_get_edid(connector, &dp->aux.ddc);
+ if (!edid)
+ return 0;
+
+ drm_mode_connector_update_edid_property(connector, edid);
+ ret = drm_add_edid_modes(connector, edid);
+ kfree(edid);
+
+ return ret;
+}
+
+static struct drm_encoder *
+zynqmp_dp_connector_best_encoder(struct drm_connector *connector)
+{
+ struct zynqmp_dp *dp = connector_to_dp(connector);
+
+ return &dp->encoder;
+}
+
+static int zynqmp_dp_connector_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ struct zynqmp_dp *dp = connector_to_dp(connector);
+ u8 max_lanes = dp->link_config.max_lanes;
+ u8 bpp = dp->config.bpp;
+ int max_rate = dp->link_config.max_rate;
+ int rate;
+
+ if (mode->clock > ZYNQMP_MAX_FREQ) {
+ dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n",
+ mode->name);
+ drm_mode_debug_printmodeline(mode);
+ return MODE_CLOCK_HIGH;
+ }
+
+ /* Check with link rate and lane count */
+ rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp);
+ if (mode->clock > rate) {
+ dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n",
+ mode->name);
+ drm_mode_debug_printmodeline(mode);
+ return MODE_CLOCK_HIGH;
+ }
+
+ return MODE_OK;
+}
+
+static void zynqmp_dp_connector_destroy(struct drm_connector *connector)
+{
+ drm_connector_unregister(connector);
+ drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs zynqmp_dp_connector_funcs = {
+ .detect = zynqmp_dp_connector_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = zynqmp_dp_connector_destroy,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+ .reset = drm_atomic_helper_connector_reset,
+};
+
+static const struct drm_connector_helper_funcs
+zynqmp_dp_connector_helper_funcs = {
+ .get_modes = zynqmp_dp_connector_get_modes,
+ .best_encoder = zynqmp_dp_connector_best_encoder,
+ .mode_valid = zynqmp_dp_connector_mode_valid,
+};
+
+/*
+ * DRM encoder functions
+ */
+
+static void zynqmp_dp_encoder_enable(struct drm_encoder *encoder)
+{
+ struct zynqmp_dp *dp = encoder_to_dp(encoder);
+ void __iomem *iomem = dp->iomem;
+ unsigned int i;
+ int ret = 0;
+
+ pm_runtime_get_sync(dp->dev);
+ dp->enabled = true;
+ zynqmp_dp_init_aux(dp);
+ zynqmp_dp_update_misc(dp);
+ if (zynqmp_disp_aud_enabled(dp->dpsub->disp))
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_CONTROL, 1);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0);
+ if (dp->status == connector_status_connected) {
+ for (i = 0; i < 3; i++) {
+ ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER,
+ DP_SET_POWER_D0);
+ if (ret == 1)
+ break;
+ usleep_range(300, 500);
+ }
+ /* Some monitors take time to wake up properly */
+ msleep(zynqmp_dp_power_on_delay_ms);
+ }
+ if (ret != 1)
+ dev_dbg(dp->dev, "DP aux failed\n");
+ else
+ zynqmp_dp_train_loop(dp);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_SW_RESET,
+ ZYNQMP_DP_TX_SW_RESET_ALL);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_ENABLE_MAIN_STREAM, 1);
+}
+
+static void zynqmp_dp_encoder_disable(struct drm_encoder *encoder)
+{
+ struct zynqmp_dp *dp = encoder_to_dp(encoder);
+ void __iomem *iomem = dp->iomem;
+
+ dp->enabled = false;
+ cancel_delayed_work(&dp->hpd_work);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_ENABLE_MAIN_STREAM, 0);
+ drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_PHY_POWER_DOWN,
+ ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
+ if (zynqmp_disp_aud_enabled(dp->dpsub->disp))
+ zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_CONTROL, 0);
+ pm_runtime_put_sync(dp->dev);
+}
+
+static void
+zynqmp_dp_encoder_atomic_mode_set(struct drm_encoder *encoder,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *connector_state)
+{
+ struct zynqmp_dp *dp = encoder_to_dp(encoder);
+ struct drm_display_mode *mode = &crtc_state->mode;
+ struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+ u8 max_lanes = dp->link_config.max_lanes;
+ u8 bpp = dp->config.bpp;
+ int rate, max_rate = dp->link_config.max_rate;
+ int ret;
+
+ /* Check again as bpp or format might have been chagned */
+ rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp);
+ if (mode->clock > rate) {
+ dev_err(dp->dev, "the mode, %s,has too high pixel rate\n",
+ mode->name);
+ drm_mode_debug_printmodeline(mode);
+ }
+
+ ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0);
+ if (ret < 0)
+ return;
+
+ zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode);
+}
+
+#define ZYNQMP_DP_MIN_H_BACKPORCH 20
+
+static int
+zynqmp_dp_encoder_atomic_check(struct drm_encoder *encoder,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state)
+{
+ struct drm_display_mode *mode = &crtc_state->mode;
+ struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+ int diff = mode->htotal - mode->hsync_end;
+
+ /*
+ * ZynqMP DP requires horizontal backporch to be greater than 12.
+ * This limitation may not be compatible with the sink device.
+ */
+ if (diff < ZYNQMP_DP_MIN_H_BACKPORCH) {
+ int vrefresh = (adjusted_mode->clock * 1000) /
+ (adjusted_mode->vtotal * adjusted_mode->htotal);
+
+ dev_dbg(encoder->dev->dev, "hbackporch adjusted: %d to %d",
+ diff, ZYNQMP_DP_MIN_H_BACKPORCH - diff);
+ diff = ZYNQMP_DP_MIN_H_BACKPORCH - diff;
+ adjusted_mode->htotal += diff;
+ adjusted_mode->clock = adjusted_mode->vtotal *
+ adjusted_mode->htotal * vrefresh / 1000;
+ }
+
+ return 0;
+}
+
+static const struct drm_encoder_funcs zynqmp_dp_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+static const struct drm_encoder_helper_funcs zynqmp_dp_encoder_helper_funcs = {
+ .enable = zynqmp_dp_encoder_enable,
+ .disable = zynqmp_dp_encoder_disable,
+ .atomic_mode_set = zynqmp_dp_encoder_atomic_mode_set,
+ .atomic_check = zynqmp_dp_encoder_atomic_check,
+};
+
+/*
+ * Component functions
+ */
+
+static void zynqmp_dp_hpd_work_func(struct work_struct *work)
+{
+ struct zynqmp_dp *dp;
+
+ dp = container_of(work, struct zynqmp_dp, hpd_work.work);
+
+ if (dp->drm)
+ drm_helper_hpd_irq_event(dp->drm);
+}
+
+int zynqmp_dp_bind(struct device *dev, struct device *master, void *data)
+{
+ struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
+ struct zynqmp_dp *dp = dpsub->dp;
+ struct drm_encoder *encoder = &dp->encoder;
+ struct drm_connector *connector = &dp->connector;
+ struct drm_device *drm = data;
+ struct device_node *port;
+ int ret;
+
+ if (!dp->num_lanes)
+ return 0;
+
+ encoder->possible_crtcs |= zynqmp_disp_get_crtc_mask(dpsub->disp);
+ for_each_child_of_node(dev->of_node, port) {
+ if (!port->name || of_node_cmp(port->name, "port"))
+ continue;
+ encoder->possible_crtcs |= drm_of_find_possible_crtcs(drm,
+ port);
+ }
+ drm_encoder_init(drm, encoder, &zynqmp_dp_encoder_funcs,
+ DRM_MODE_ENCODER_TMDS, NULL);
+ drm_encoder_helper_add(encoder, &zynqmp_dp_encoder_helper_funcs);
+
+ connector->polled = DRM_CONNECTOR_POLL_HPD;
+ ret = drm_connector_init(encoder->dev, connector,
+ &zynqmp_dp_connector_funcs,
+ DRM_MODE_CONNECTOR_DisplayPort);
+ if (ret) {
+ dev_err(dp->dev, "failed to initialize the drm connector");
+ goto error_encoder;
+ }
+
+ drm_connector_helper_add(connector, &zynqmp_dp_connector_helper_funcs);
+ drm_connector_register(connector);
+ drm_mode_connector_attach_encoder(connector, encoder);
+ connector->dpms = DRM_MODE_DPMS_OFF;
+
+ dp->drm = drm;
+ dp->config.misc0 &= ~ZYNQMP_DP_TX_MAIN_STREAM_MISC0_SYNC;
+ ret = zynqmp_dp_set_bpc(dp, 8);
+ zynqmp_dp_update_bpp(dp);
+
+ /* This enables interrupts, so should be called after DRM init */
+ ret = zynqmp_dp_init_aux(dp);
+ if (ret) {
+ dev_err(dp->dev, "failed to initialize DP aux");
+ goto error_connector;
+ }
+ INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
+
+ return 0;
+
+error_connector:
+ zynqmp_dp_connector_destroy(&dp->connector);
+error_encoder:
+ drm_encoder_cleanup(&dp->encoder);
+ return ret;
+}
+
+void zynqmp_dp_unbind(struct device *dev, struct device *master, void *data)
+{
+ struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
+ struct zynqmp_dp *dp = dpsub->dp;
+
+ disable_irq(dp->irq);
+ if (!dp->num_lanes)
+ return;
+
+ cancel_delayed_work_sync(&dp->hpd_work);
+ zynqmp_dp_exit_aux(dp);
+ zynqmp_dp_connector_destroy(&dp->connector);
+ drm_encoder_cleanup(&dp->encoder);
+}
+
+/*
+ * Platform functions
+ */
+
+static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
+{
+ struct zynqmp_dp *dp = (struct zynqmp_dp *)data;
+ u32 status, mask;
+
+ status = zynqmp_dp_read(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_STATUS);
+ mask = zynqmp_dp_read(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_MASK);
+ if (!(status & ~mask))
+ return IRQ_NONE;
+
+ /* dbg for diagnostic, but not much that the driver can do */
+ if (status & ZYNQMP_DP_TX_INTR_CHBUF_UNDERFLW_MASK)
+ dev_dbg_ratelimited(dp->dev, "underflow interrupt\n");
+ if (status & ZYNQMP_DP_TX_INTR_CHBUF_OVERFLW_MASK)
+ dev_dbg_ratelimited(dp->dev, "overflow interrupt\n");
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_STATUS, status);
+
+ /* The DP vblank will not be enabled with remote crtc device */
+ if (status & ZYNQMP_DP_TX_INTR_VBLANK_START)
+ zynqmp_disp_handle_vblank(dp->dpsub->disp);
+
+ if (status & ZYNQMP_DP_TX_INTR_HPD_EVENT)
+ schedule_delayed_work(&dp->hpd_work, 0);
+
+ if (status & ZYNQMP_DP_TX_INTR_HPD_IRQ) {
+ int ret;
+ u8 status[DP_LINK_STATUS_SIZE + 2];
+
+ ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status,
+ DP_LINK_STATUS_SIZE + 2);
+ if (ret < 0)
+ goto handled;
+
+ if (status[4] & DP_LINK_STATUS_UPDATED ||
+ !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) ||
+ !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) {
+ zynqmp_dp_train_loop(dp);
+ }
+ }
+
+handled:
+ return IRQ_HANDLED;
+}
+
+int zynqmp_dp_probe(struct platform_device *pdev)
+{
+ struct zynqmp_dpsub *dpsub;
+ struct zynqmp_dp *dp;
+ struct resource *res;
+ unsigned int i;
+ int irq, ret;
+
+ dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
+ if (!dp)
+ return -ENOMEM;
+
+ dp->dpms = DRM_MODE_DPMS_OFF;
+ dp->status = connector_status_disconnected;
+ dp->dev = &pdev->dev;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp");
+ dp->iomem = devm_ioremap_resource(dp->dev, res);
+ if (IS_ERR(dp->iomem))
+ return PTR_ERR(dp->iomem);
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_PHY_POWER_DOWN,
+ ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
+ zynqmp_dp_set(dp->iomem, ZYNQMP_DP_TX_PHY_CONFIG,
+ ZYNQMP_DP_TX_PHY_CONFIG_ALL_RESET);
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_FORCE_SCRAMBLER_RESET, 1);
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_ENABLE, 0);
+
+ dp->num_lanes = 2;
+ for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) {
+ char phy_name[16];
+
+ snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i);
+ dp->phy[i] = devm_phy_get(dp->dev, phy_name);
+ if (IS_ERR(dp->phy[i])) {
+ ret = PTR_ERR(dp->phy[i]);
+ dp->phy[i] = NULL;
+
+ /* 2nd lane is optional */
+ if (i == 1 && ret == -ENODEV) {
+ dp->num_lanes = 1;
+ break;
+ }
+
+ /*
+ * If no phy lane is assigned, the DP Tx gets disabled.
+ * The display part of the DP subsystem can still be
+ * used to drive the output to FPGA, thus let the DP
+ * subsystem driver to proceed without this DP Tx.
+ */
+ if (i == 0 && ret == -ENODEV) {
+ dp->num_lanes = 0;
+ goto out;
+ }
+
+ if (ret != -EPROBE_DEFER)
+ dev_err(dp->dev, "failed to get phy lane\n");
+
+ return ret;
+ }
+ }
+
+ ret = zynqmp_dp_init_phy(dp);
+ if (ret)
+ goto error_phy;
+
+ dp->aux.name = "ZynqMP DP AUX";
+ dp->aux.dev = dp->dev;
+ dp->aux.transfer = zynqmp_dp_aux_transfer;
+ ret = drm_dp_aux_register(&dp->aux);
+ if (ret < 0) {
+ dev_err(dp->dev, "failed to initialize DP aux\n");
+ goto error;
+ }
+
+out:
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ ret = irq;
+ goto error;
+ }
+
+ ret = devm_request_threaded_irq(dp->dev, irq, NULL,
+ zynqmp_dp_irq_handler, IRQF_ONESHOT,
+ dev_name(dp->dev), dp);
+ if (ret < 0)
+ goto error;
+ dp->irq = irq;
+
+ dpsub = platform_get_drvdata(pdev);
+ dpsub->dp = dp;
+ dp->dpsub = dpsub;
+
+ dev_dbg(dp->dev,
+ "ZynqMP DisplayPort Tx driver probed with %u phy lanes\n",
+ dp->num_lanes);
+
+ return 0;
+
+error:
+ drm_dp_aux_unregister(&dp->aux);
+error_phy:
+ zynqmp_dp_exit_phy(dp);
+ return ret;
+}
+
+int zynqmp_dp_remove(struct platform_device *pdev)
+{
+ struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
+ struct zynqmp_dp *dp = dpsub->dp;
+
+ zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_ENABLE, 0);
+ drm_dp_aux_unregister(&dp->aux);
+ zynqmp_dp_exit_phy(dp);
+ dpsub->dp = NULL;
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.h b/drivers/gpu/drm/xlnx/zynqmp_dp.h
new file mode 100644
index 0000000..a9360f1
--- /dev/null
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.h
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ZynqMP DisplayPort Driver
+ *
+ * Copyright (C) 2017 - 2018 Xilinx, Inc.
+ *
+ * Author: Hyun Woo Kwon <hyun.kwon@xxxxxxxxxx>
+ */
+
+#ifndef _ZYNQMP_DP_H_
+#define _ZYNQMP_DP_H_
+
+struct device;
+struct drm_display_mode;
+struct platform_device;
+struct zynqmp_dp;
+
+const int zynqmp_dp_set_color(struct zynqmp_dp *dp, const char *color);
+void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp);
+void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp);
+void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp,
+ struct drm_display_mode *mode);
+
+int zynqmp_dp_bind(struct device *dev, struct device *master, void *data);
+void zynqmp_dp_unbind(struct device *dev, struct device *master, void *data);
+
+int zynqmp_dp_probe(struct platform_device *pdev);
+int zynqmp_dp_remove(struct platform_device *pdev);
+
+#endif /* _ZYNQMP_DP_H_ */
--
2.7.4
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