diff options
Diffstat (limited to 'drivers/gpu/drm/xlnx/zynqmp_dp.c')
| -rw-r--r-- | drivers/gpu/drm/xlnx/zynqmp_dp.c | 1741 |
1 files changed, 1741 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c new file mode 100644 index 000000000..d14612b34 --- /dev/null +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c @@ -0,0 +1,1741 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ZynqMP DisplayPort Driver + * + * Copyright (C) 2017 - 2020 Xilinx, Inc. + * + * Authors: + * - Hyun Woo Kwon <hyun.kwon@xilinx.com> + * - Laurent Pinchart <laurent.pinchart@ideasonboard.com> + */ + +#include <drm/display/drm_dp_helper.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_connector.h> +#include <drm/drm_crtc.h> +#include <drm/drm_device.h> +#include <drm/drm_edid.h> +#include <drm/drm_encoder.h> +#include <drm/drm_managed.h> +#include <drm/drm_modes.h> +#include <drm/drm_of.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_simple_kms_helper.h> + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/phy/phy.h> +#include <linux/reset.h> + +#include "zynqmp_disp.h" +#include "zynqmp_dp.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(power_on_delay_ms, "DP power on delay in msec (default: 4)"); + +/* Link configuration registers */ +#define ZYNQMP_DP_LINK_BW_SET 0x0 +#define ZYNQMP_DP_LANE_COUNT_SET 0x4 +#define ZYNQMP_DP_ENHANCED_FRAME_EN 0x8 +#define ZYNQMP_DP_TRAINING_PATTERN_SET 0xc +#define ZYNQMP_DP_SCRAMBLING_DISABLE 0x14 +#define ZYNQMP_DP_DOWNSPREAD_CTL 0x18 +#define ZYNQMP_DP_SOFTWARE_RESET 0x1c +#define ZYNQMP_DP_SOFTWARE_RESET_STREAM1 BIT(0) +#define ZYNQMP_DP_SOFTWARE_RESET_STREAM2 BIT(1) +#define ZYNQMP_DP_SOFTWARE_RESET_STREAM3 BIT(2) +#define ZYNQMP_DP_SOFTWARE_RESET_STREAM4 BIT(3) +#define ZYNQMP_DP_SOFTWARE_RESET_AUX BIT(7) +#define ZYNQMP_DP_SOFTWARE_RESET_ALL (ZYNQMP_DP_SOFTWARE_RESET_STREAM1 | \ + ZYNQMP_DP_SOFTWARE_RESET_STREAM2 | \ + ZYNQMP_DP_SOFTWARE_RESET_STREAM3 | \ + ZYNQMP_DP_SOFTWARE_RESET_STREAM4 | \ + ZYNQMP_DP_SOFTWARE_RESET_AUX) + +/* Core enable registers */ +#define ZYNQMP_DP_TRANSMITTER_ENABLE 0x80 +#define ZYNQMP_DP_MAIN_STREAM_ENABLE 0x84 +#define ZYNQMP_DP_FORCE_SCRAMBLER_RESET 0xc0 +#define ZYNQMP_DP_VERSION 0xf8 +#define ZYNQMP_DP_VERSION_MAJOR_MASK GENMASK(31, 24) +#define ZYNQMP_DP_VERSION_MAJOR_SHIFT 24 +#define ZYNQMP_DP_VERSION_MINOR_MASK GENMASK(23, 16) +#define ZYNQMP_DP_VERSION_MINOR_SHIFT 16 +#define ZYNQMP_DP_VERSION_REVISION_MASK GENMASK(15, 12) +#define ZYNQMP_DP_VERSION_REVISION_SHIFT 12 +#define ZYNQMP_DP_VERSION_PATCH_MASK GENMASK(11, 8) +#define ZYNQMP_DP_VERSION_PATCH_SHIFT 8 +#define ZYNQMP_DP_VERSION_INTERNAL_MASK GENMASK(7, 0) +#define ZYNQMP_DP_VERSION_INTERNAL_SHIFT 0 + +/* Core ID registers */ +#define ZYNQMP_DP_CORE_ID 0xfc +#define ZYNQMP_DP_CORE_ID_MAJOR_MASK GENMASK(31, 24) +#define ZYNQMP_DP_CORE_ID_MAJOR_SHIFT 24 +#define ZYNQMP_DP_CORE_ID_MINOR_MASK GENMASK(23, 16) +#define ZYNQMP_DP_CORE_ID_MINOR_SHIFT 16 +#define ZYNQMP_DP_CORE_ID_REVISION_MASK GENMASK(15, 8) +#define ZYNQMP_DP_CORE_ID_REVISION_SHIFT 8 +#define ZYNQMP_DP_CORE_ID_DIRECTION GENMASK(1) + +/* AUX channel interface registers */ +#define ZYNQMP_DP_AUX_COMMAND 0x100 +#define ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT 8 +#define ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY BIT(12) +#define ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT 0 +#define ZYNQMP_DP_AUX_WRITE_FIFO 0x104 +#define ZYNQMP_DP_AUX_ADDRESS 0x108 +#define ZYNQMP_DP_AUX_CLK_DIVIDER 0x10c +#define ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT 8 +#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE 0x130 +#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD BIT(0) +#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST BIT(1) +#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY BIT(2) +#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT BIT(3) +#define ZYNQMP_DP_AUX_REPLY_DATA 0x134 +#define ZYNQMP_DP_AUX_REPLY_CODE 0x138 +#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK (0) +#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_NACK BIT(0) +#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_DEFER BIT(1) +#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK (0) +#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_NACK BIT(2) +#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_DEFER BIT(3) +#define ZYNQMP_DP_AUX_REPLY_COUNT 0x13c +#define ZYNQMP_DP_REPLY_DATA_COUNT 0x148 +#define ZYNQMP_DP_REPLY_DATA_COUNT_MASK 0xff +#define ZYNQMP_DP_INT_STATUS 0x3a0 +#define ZYNQMP_DP_INT_MASK 0x3a4 +#define ZYNQMP_DP_INT_EN 0x3a8 +#define ZYNQMP_DP_INT_DS 0x3ac +#define ZYNQMP_DP_INT_HPD_IRQ BIT(0) +#define ZYNQMP_DP_INT_HPD_EVENT BIT(1) +#define ZYNQMP_DP_INT_REPLY_RECEIVED BIT(2) +#define ZYNQMP_DP_INT_REPLY_TIMEOUT BIT(3) +#define ZYNQMP_DP_INT_HPD_PULSE_DET BIT(4) +#define ZYNQMP_DP_INT_EXT_PKT_TXD BIT(5) +#define ZYNQMP_DP_INT_LIV_ABUF_UNDRFLW BIT(12) +#define ZYNQMP_DP_INT_VBLANK_START BIT(13) +#define ZYNQMP_DP_INT_PIXEL1_MATCH BIT(14) +#define ZYNQMP_DP_INT_PIXEL0_MATCH BIT(15) +#define ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK 0x3f0000 +#define ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK 0xfc00000 +#define ZYNQMP_DP_INT_CUST_TS_2 BIT(28) +#define ZYNQMP_DP_INT_CUST_TS BIT(29) +#define ZYNQMP_DP_INT_EXT_VSYNC_TS BIT(30) +#define ZYNQMP_DP_INT_VSYNC_TS BIT(31) +#define ZYNQMP_DP_INT_ALL (ZYNQMP_DP_INT_HPD_IRQ | \ + ZYNQMP_DP_INT_HPD_EVENT | \ + ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK | \ + ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK) + +/* Main stream attribute registers */ +#define ZYNQMP_DP_MAIN_STREAM_HTOTAL 0x180 +#define ZYNQMP_DP_MAIN_STREAM_VTOTAL 0x184 +#define ZYNQMP_DP_MAIN_STREAM_POLARITY 0x188 +#define ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT 0 +#define ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT 1 +#define ZYNQMP_DP_MAIN_STREAM_HSWIDTH 0x18c +#define ZYNQMP_DP_MAIN_STREAM_VSWIDTH 0x190 +#define ZYNQMP_DP_MAIN_STREAM_HRES 0x194 +#define ZYNQMP_DP_MAIN_STREAM_VRES 0x198 +#define ZYNQMP_DP_MAIN_STREAM_HSTART 0x19c +#define ZYNQMP_DP_MAIN_STREAM_VSTART 0x1a0 +#define ZYNQMP_DP_MAIN_STREAM_MISC0 0x1a4 +#define ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK BIT(0) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB (0 << 1) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422 (5 << 1) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444 (6 << 1) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK (7 << 1) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_DYNAMIC_RANGE BIT(3) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_YCBCR_COLR BIT(4) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6 (0 << 5) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8 (1 << 5) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10 (2 << 5) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12 (3 << 5) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16 (4 << 5) +#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK (7 << 5) +#define ZYNQMP_DP_MAIN_STREAM_MISC1 0x1a8 +#define ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN BIT(7) +#define ZYNQMP_DP_MAIN_STREAM_M_VID 0x1ac +#define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE 0x1b0 +#define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF 64 +#define ZYNQMP_DP_MAIN_STREAM_N_VID 0x1b4 +#define ZYNQMP_DP_USER_PIX_WIDTH 0x1b8 +#define ZYNQMP_DP_USER_DATA_COUNT_PER_LANE 0x1bc +#define ZYNQMP_DP_MIN_BYTES_PER_TU 0x1c4 +#define ZYNQMP_DP_FRAC_BYTES_PER_TU 0x1c8 +#define ZYNQMP_DP_INIT_WAIT 0x1cc + +/* PHY configuration and status registers */ +#define ZYNQMP_DP_PHY_RESET 0x200 +#define ZYNQMP_DP_PHY_RESET_PHY_RESET BIT(0) +#define ZYNQMP_DP_PHY_RESET_GTTX_RESET BIT(1) +#define ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET BIT(8) +#define ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET BIT(9) +#define ZYNQMP_DP_PHY_RESET_ALL_RESET (ZYNQMP_DP_PHY_RESET_PHY_RESET | \ + ZYNQMP_DP_PHY_RESET_GTTX_RESET | \ + ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET | \ + ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET) +#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_0 0x210 +#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_1 0x214 +#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_2 0x218 +#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_3 0x21c +#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_0 0x220 +#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_1 0x224 +#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_2 0x228 +#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_3 0x22c +#define ZYNQMP_DP_PHY_CLOCK_SELECT 0x234 +#define ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G 0x1 +#define ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G 0x3 +#define ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G 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_PHY_PRECURSOR_LANE_0 0x23c +#define ZYNQMP_DP_PHY_PRECURSOR_LANE_1 0x240 +#define ZYNQMP_DP_PHY_PRECURSOR_LANE_2 0x244 +#define ZYNQMP_DP_PHY_PRECURSOR_LANE_3 0x248 +#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_0 0x24c +#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_1 0x250 +#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_2 0x254 +#define ZYNQMP_DP_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_PHY_STATUS 0x280 +#define ZYNQMP_DP_PHY_STATUS_PLL_LOCKED_SHIFT 4 +#define ZYNQMP_DP_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_M_AUD 0x328 +#define ZYNQMP_DP_TX_N_AUD 0x32c +#define ZYNQMP_DP_TX_AUDIO_EXT_DATA 0x330 + +#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 + */ +struct zynqmp_dp_config { + u8 misc0; + u8 misc1; + u8 bpp; +}; + +/** + * 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 + * @reset: reset controller + * @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 + * @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; + struct reset_control *reset; + 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; + + 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(struct zynqmp_dp *dp, int offset, u32 val) +{ + writel(val, dp->iomem + offset); +} + +static u32 zynqmp_dp_read(struct zynqmp_dp *dp, int offset) +{ + return readl(dp->iomem + offset); +} + +static void zynqmp_dp_clr(struct zynqmp_dp *dp, int offset, u32 clr) +{ + zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) & ~clr); +} + +static void zynqmp_dp_set(struct zynqmp_dp *dp, int offset, u32 set) +{ + zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) | set); +} + +/* ----------------------------------------------------------------------------- + * PHY Handling + */ + +#define RST_TIMEOUT_MS 1000 + +static int zynqmp_dp_reset(struct zynqmp_dp *dp, bool assert) +{ + unsigned long timeout; + + if (assert) + reset_control_assert(dp->reset); + else + reset_control_deassert(dp->reset); + + /* Wait for the (de)assert to complete. */ + timeout = jiffies + msecs_to_jiffies(RST_TIMEOUT_MS); + while (!time_after_eq(jiffies, timeout)) { + bool status = !!reset_control_status(dp->reset); + + if (assert == status) + return 0; + + cpu_relax(); + } + + dev_err(dp->dev, "reset %s timeout\n", assert ? "assert" : "deassert"); + return -ETIMEDOUT; +} + +/** + * zynqmp_dp_phy_init - 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_phy_init(struct zynqmp_dp *dp) +{ + int ret; + int i; + + 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_clr(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET); + + /* + * Power on lanes in reverse order as only lane 0 waits for the PLL to + * lock. + */ + for (i = dp->num_lanes - 1; i >= 0; i--) { + ret = phy_power_on(dp->phy[i]); + if (ret) { + dev_err(dp->dev, "failed to power on phy lane %d\n", i); + return ret; + } + } + + return 0; +} + +/** + * zynqmp_dp_phy_exit - Exit the phy + * @dp: DisplayPort IP core structure + * + * Exit the phy. + */ +static void zynqmp_dp_phy_exit(struct zynqmp_dp *dp) +{ + unsigned int i; + int ret; + + for (i = 0; i < dp->num_lanes; i++) { + ret = phy_power_off(dp->phy[i]); + if (ret) + dev_err(dp->dev, "failed to power off phy(%d) %d\n", i, + 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_probe - Probe the PHYs + * @dp: DisplayPort IP core structure + * + * Probe PHYs for all lanes. Less PHYs may be available than the number of + * lanes, which is not considered an error as long as at least one PHY is + * found. The caller can check dp->num_lanes to check how many PHYs were found. + * + * Return: + * * 0 - Success + * * -ENXIO - No PHY found + * * -EPROBE_DEFER - Probe deferral requested + * * Other negative value - PHY retrieval failure + */ +static int zynqmp_dp_phy_probe(struct zynqmp_dp *dp) +{ + unsigned int i; + + for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) { + char phy_name[16]; + struct phy *phy; + + snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i); + phy = devm_phy_get(dp->dev, phy_name); + + if (IS_ERR(phy)) { + switch (PTR_ERR(phy)) { + case -ENODEV: + if (dp->num_lanes) + return 0; + + dev_err(dp->dev, "no PHY found\n"); + return -ENXIO; + + case -EPROBE_DEFER: + return -EPROBE_DEFER; + + default: + dev_err(dp->dev, "failed to get PHY lane %u\n", + i); + return PTR_ERR(phy); + } + } + + dp->phy[i] = phy; + dp->num_lanes++; + } + + return 0; +} + +/** + * 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, ZYNQMP_DP_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; +} + +/* ----------------------------------------------------------------------------- + * DisplayPort Link Training + */ + +/** + * 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 bw_code; + 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; + + /* Downshift from current bandwidth */ + switch (current_bw) { + case DP_LINK_BW_5_4: + bw_code = DP_LINK_BW_2_7; + break; + case DP_LINK_BW_2_7: + bw_code = DP_LINK_BW_1_62; + break; + case DP_LINK_BW_1_62: + dev_err(dp->dev, "can't downshift. already lowest link rate\n"); + return -EINVAL; + default: + /* If not given, start with max supported */ + bw_code = 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(bw_code); + rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp); + if (pclock <= rate) { + dp->mode.bw_code = bw_code; + 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) +{ + unsigned int i; + int ret; + + ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->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; + union phy_configure_opts opts = { 0 }; + u8 train = dp->train_set[i]; + + opts.dp.voltage[0] = (train & DP_TRAIN_VOLTAGE_SWING_MASK) + >> DP_TRAIN_VOLTAGE_SWING_SHIFT; + opts.dp.pre[0] = (train & DP_TRAIN_PRE_EMPHASIS_MASK) + >> DP_TRAIN_PRE_EMPHASIS_SHIFT; + + phy_configure(dp->phy[i], &opts); + + zynqmp_dp_write(dp, 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, ZYNQMP_DP_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->aux, 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, ZYNQMP_DP_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->aux, 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, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt); + enhanced = drm_dp_enhanced_frame_cap(dp->dpcd); + if (enhanced) { + zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1); + aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN; + } + + if (dp->dpcd[3] & 0x1) { + zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 1); + drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, + DP_SPREAD_AMP_0_5); + } else { + zynqmp_dp_write(dp, ZYNQMP_DP_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, ZYNQMP_DP_LINK_BW_SET, bw_code); + switch (bw_code) { + case DP_LINK_BW_1_62: + reg = ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G; + break; + case DP_LINK_BW_2_7: + reg = ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G; + break; + case DP_LINK_BW_5_4: + default: + reg = ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G; + break; + } + + zynqmp_dp_write(dp, ZYNQMP_DP_PHY_CLOCK_SELECT, reg); + ret = zynqmp_dp_phy_ready(dp); + if (ret < 0) + return ret; + + zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1); + memset(dp->train_set, 0, sizeof(dp->train_set)); + 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, ZYNQMP_DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_DISABLE); + + zynqmp_dp_write(dp, ZYNQMP_DP_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"); +} + +/* ----------------------------------------------------------------------------- + * DisplayPort AUX + */ + +#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; + u32 reg, i; + + reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); + if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST) + return -EBUSY; + + zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr); + if (!is_read) + for (i = 0; i < bytes; i++) + zynqmp_dp_write(dp, ZYNQMP_DP_AUX_WRITE_FIFO, + buf[i]); + + reg = cmd << ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT; + if (!buf || !bytes) + reg |= ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY; + else + reg |= (bytes - 1) << ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT; + zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg); + + /* Wait for reply to be delivered upto 2ms */ + for (i = 0; ; i++) { + reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); + if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY) + break; + + if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT || + i == 2) + return -ETIMEDOUT; + + usleep_range(1000, 1100); + } + + reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE); + if (reply) + *reply = reg; + + if (is_read && + (reg == ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK || + reg == ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK)) { + reg = zynqmp_dp_read(dp, ZYNQMP_DP_REPLY_DATA_COUNT); + if ((reg & ZYNQMP_DP_REPLY_DATA_COUNT_MASK) != bytes) + return -EIO; + + for (i = 0; i < bytes; i++) + buf[i] = zynqmp_dp_read(dp, ZYNQMP_DP_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_aux_init - Initialize and register the DP AUX + * @dp: DisplayPort IP core structure + * + * Program the AUX clock divider and filter and register the DP AUX adapter. + * + * Return: 0 on success, error value otherwise + */ +static int zynqmp_dp_aux_init(struct zynqmp_dp *dp) +{ + unsigned long rate; + unsigned int w; + + /* + * The AUX_SIGNAL_WIDTH_FILTER is the number of APB clock cycles + * corresponding to the AUX pulse. Allowable values are 8, 16, 24, 32, + * 40 and 48. The AUX pulse width must be between 0.4µs and 0.6µs, + * compute the w / 8 value corresponding to 0.4µs rounded up, and make + * sure it stays below 0.6µs and within the allowable values. + */ + rate = clk_get_rate(dp->dpsub->apb_clk); + w = DIV_ROUND_UP(4 * rate, 1000 * 1000 * 10 * 8) * 8; + if (w > 6 * rate / (1000 * 1000 * 10) || w > 48) { + dev_err(dp->dev, "aclk frequency too high\n"); + return -EINVAL; + } + + zynqmp_dp_write(dp, ZYNQMP_DP_AUX_CLK_DIVIDER, + (w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) | + (rate / (1000 * 1000))); + + dp->aux.name = "ZynqMP DP AUX"; + dp->aux.dev = dp->dev; + dp->aux.drm_dev = dp->drm; + dp->aux.transfer = zynqmp_dp_aux_transfer; + + return drm_dp_aux_register(&dp->aux); +} + +/** + * zynqmp_dp_aux_cleanup - Cleanup the DP AUX + * @dp: DisplayPort IP core structure + * + * Unregister the DP AUX adapter. + */ +static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp) +{ + drm_dp_aux_unregister(&dp->aux); +} + +/* ----------------------------------------------------------------------------- + * DisplayPort Generic Support + */ + +/** + * 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, ZYNQMP_DP_MAIN_STREAM_MISC0, dp->config.misc0); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC1, dp->config.misc1); +} + +/** + * zynqmp_dp_set_format - Set the input format + * @dp: DisplayPort IP core structure + * @format: input format + * @bpc: bits per component + * + * Update misc register values based on input @format and @bpc. + * + * Return: 0 on success, or -EINVAL. + */ +static int zynqmp_dp_set_format(struct zynqmp_dp *dp, + enum zynqmp_dpsub_format format, + unsigned int bpc) +{ + static const struct drm_display_info *display; + struct zynqmp_dp_config *config = &dp->config; + unsigned int num_colors; + + config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK; + config->misc1 &= ~ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN; + + switch (format) { + case ZYNQMP_DPSUB_FORMAT_RGB: + config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB; + num_colors = 3; + break; + + case ZYNQMP_DPSUB_FORMAT_YCRCB444: + config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444; + num_colors = 3; + break; + + case ZYNQMP_DPSUB_FORMAT_YCRCB422: + config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422; + num_colors = 2; + break; + + case ZYNQMP_DPSUB_FORMAT_YONLY: + config->misc1 |= ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN; + num_colors = 1; + break; + + default: + dev_err(dp->dev, "Invalid colormetry in DT\n"); + return -EINVAL; + } + + display = &dp->connector.display_info; + if (display->bpc && bpc > display->bpc) { + dev_warn(dp->dev, + "downgrading requested %ubpc to display limit %ubpc\n", + bpc, display->bpc); + bpc = display->bpc; + } + + config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK; + + switch (bpc) { + case 6: + config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6; + break; + case 8: + config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8; + break; + case 10: + config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10; + break; + case 12: + config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12; + break; + case 16: + config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16; + break; + default: + dev_warn(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n", + bpc); + config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8; + bpc = 8; + break; + } + + /* Update the current bpp based on the format. */ + config->bpp = bpc * num_colors; + + return 0; +} + +/** + * 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 calculate 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_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF; + u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait; + + /* Use the max transfer unit size (default) */ + zynqmp_dp_write(dp, ZYNQMP_DP_MSA_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, ZYNQMP_DP_MIN_BYTES_PER_TU, + avg_bytes_per_tu / 1000); + zynqmp_dp_write(dp, ZYNQMP_DP_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, ZYNQMP_DP_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. + */ +static void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp, + const struct drm_display_mode *mode) +{ + u8 lane_cnt = dp->mode.lane_cnt; + u32 reg, wpl; + unsigned int rate; + + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HTOTAL, mode->htotal); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VTOTAL, mode->vtotal); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_POLARITY, + (!!(mode->flags & DRM_MODE_FLAG_PVSYNC) << + ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT) | + (!!(mode->flags & DRM_MODE_FLAG_PHSYNC) << + ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT)); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSWIDTH, + mode->hsync_end - mode->hsync_start); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSWIDTH, + mode->vsync_end - mode->vsync_start); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HRES, mode->hdisplay); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VRES, mode->vdisplay); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSTART, + mode->htotal - mode->hsync_start); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSTART, + mode->vtotal - mode->vsync_start); + + /* In synchronous mode, set the diviers */ + if (dp->config.misc0 & ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK) { + reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_N_VID, reg); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_M_VID, mode->clock); + rate = zynqmp_disp_get_audio_clk_rate(dp->dpsub->disp); + if (rate) { + dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512); + zynqmp_dp_write(dp, ZYNQMP_DP_TX_N_AUD, reg); + zynqmp_dp_write(dp, ZYNQMP_DP_TX_M_AUD, rate / 1000); + } + } + + /* Only 2 channel audio is supported now */ + if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) + zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1); + + zynqmp_dp_write(dp, ZYNQMP_DP_USER_PIX_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(dp, ZYNQMP_DP_USER_DATA_COUNT_PER_LANE, reg); +} + +/* ----------------------------------------------------------------------------- + * DRM Connector + */ + +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, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); + if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) + break; + msleep(100); + } + + if (state & ZYNQMP_DP_INTERRUPT_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 failed"); + 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_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 const struct drm_connector_funcs zynqmp_dp_connector_funcs = { + .detect = zynqmp_dp_connector_detect, + .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, + .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 + */ + +static void zynqmp_dp_encoder_enable(struct drm_encoder *encoder) +{ + struct zynqmp_dp *dp = encoder_to_dp(encoder); + unsigned int i; + int ret = 0; + + pm_runtime_get_sync(dp->dev); + dp->enabled = true; + zynqmp_dp_update_misc(dp); + if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) + zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 1); + zynqmp_dp_write(dp, 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(dp, ZYNQMP_DP_SOFTWARE_RESET, + ZYNQMP_DP_SOFTWARE_RESET_ALL); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 1); +} + +static void zynqmp_dp_encoder_disable(struct drm_encoder *encoder) +{ + struct zynqmp_dp *dp = encoder_to_dp(encoder); + + dp->enabled = false; + cancel_delayed_work(&dp->hpd_work); + zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0); + drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3); + zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, + ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL); + if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) + zynqmp_dp_write(dp, 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; + + zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8); + + /* 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); + zynqmp_dp_encoder_mode_set_stream(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_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, +}; + +/* ----------------------------------------------------------------------------- + * Interrupt Handling + */ + +/** + * 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, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_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, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_VBLANK_START); +} + +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); +} + +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, ZYNQMP_DP_INT_STATUS); + mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK); + if (!(status & ~mask)) + return IRQ_NONE; + + /* dbg for diagnostic, but not much that the driver can do */ + if (status & ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK) + dev_dbg_ratelimited(dp->dev, "underflow interrupt\n"); + if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK) + dev_dbg_ratelimited(dp->dev, "overflow interrupt\n"); + + zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status); + + if (status & ZYNQMP_DP_INT_VBLANK_START) + zynqmp_disp_handle_vblank(dp->dpsub->disp); + + if (status & ZYNQMP_DP_INT_HPD_EVENT) + schedule_delayed_work(&dp->hpd_work, 0); + + if (status & ZYNQMP_DP_INT_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; +} + +/* ----------------------------------------------------------------------------- + * Initialization & Cleanup + */ + +int zynqmp_dp_drm_init(struct zynqmp_dpsub *dpsub) +{ + struct zynqmp_dp *dp = dpsub->dp; + struct drm_encoder *encoder = &dp->encoder; + struct drm_connector *connector = &dp->connector; + int ret; + + dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK; + zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8); + + /* Create the DRM encoder and connector. */ + encoder->possible_crtcs |= zynqmp_disp_get_crtc_mask(dpsub->disp); + drm_simple_encoder_init(dp->drm, encoder, DRM_MODE_ENCODER_TMDS); + 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 create the DRM connector\n"); + return ret; + } + + drm_connector_helper_add(connector, &zynqmp_dp_connector_helper_funcs); + drm_connector_register(connector); + drm_connector_attach_encoder(connector, encoder); + + /* Initialize and register the AUX adapter. */ + ret = zynqmp_dp_aux_init(dp); + if (ret) { + dev_err(dp->dev, "failed to initialize DP aux\n"); + return ret; + } + + /* Now that initialisation is complete, enable interrupts. */ + zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_ALL); + + return 0; +} + +int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm) +{ + struct platform_device *pdev = to_platform_device(dpsub->dev); + struct zynqmp_dp *dp; + struct resource *res; + int ret; + + dp = drmm_kzalloc(drm, sizeof(*dp), GFP_KERNEL); + if (!dp) + return -ENOMEM; + + dp->dev = &pdev->dev; + dp->dpsub = dpsub; + dp->status = connector_status_disconnected; + dp->drm = drm; + + INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func); + + dpsub->dp = dp; + + /* Acquire all resources (IOMEM, IRQ and PHYs). */ + 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); + + dp->irq = platform_get_irq(pdev, 0); + if (dp->irq < 0) + return dp->irq; + + dp->reset = devm_reset_control_get(dp->dev, NULL); + if (IS_ERR(dp->reset)) { + if (PTR_ERR(dp->reset) != -EPROBE_DEFER) + dev_err(dp->dev, "failed to get reset: %ld\n", + PTR_ERR(dp->reset)); + return PTR_ERR(dp->reset); + } + + ret = zynqmp_dp_reset(dp, false); + if (ret < 0) + return ret; + + ret = zynqmp_dp_phy_probe(dp); + if (ret) + goto err_reset; + + /* Initialize the hardware. */ + zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, + ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL); + zynqmp_dp_set(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET); + zynqmp_dp_write(dp, ZYNQMP_DP_FORCE_SCRAMBLER_RESET, 1); + zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0); + zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff); + + ret = zynqmp_dp_phy_init(dp); + if (ret) + goto err_reset; + + zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 1); + + /* + * Now that the hardware is initialized and won't generate spurious + * interrupts, request the IRQ. + */ + ret = devm_request_threaded_irq(dp->dev, dp->irq, NULL, + zynqmp_dp_irq_handler, IRQF_ONESHOT, + dev_name(dp->dev), dp); + if (ret < 0) + goto err_phy_exit; + + dev_dbg(dp->dev, "ZynqMP DisplayPort Tx probed with %u lanes\n", + dp->num_lanes); + + return 0; + +err_phy_exit: + zynqmp_dp_phy_exit(dp); +err_reset: + zynqmp_dp_reset(dp, true); + + return ret; +} + +void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub) +{ + struct zynqmp_dp *dp = dpsub->dp; + + zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL); + disable_irq(dp->irq); + + cancel_delayed_work_sync(&dp->hpd_work); + zynqmp_dp_aux_cleanup(dp); + + zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0); + zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff); + + zynqmp_dp_phy_exit(dp); + zynqmp_dp_reset(dp, true); +} |