From: Quentin Schulz quentin.schulz@bootlin.com
This patch finally adds the preliminary driver for Cadence MHDP DPI/DP bridge.
Changes made in the low level driver: - functions for writing register and register bits are now public - added functions for reading registers and link training adjustment
Signed-off-by: Damian Kos dkos@cadence.com --- drivers/gpu/drm/bridge/Makefile | 2 +- drivers/gpu/drm/bridge/cdns-mhdp-common.c | 110 +- drivers/gpu/drm/bridge/cdns-mhdp-common.h | 11 + drivers/gpu/drm/bridge/cdns-mhdp.c | 1233 +++++++++++++++++++++ 4 files changed, 1353 insertions(+), 3 deletions(-) create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp.c
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index c9b35f736a00..5e2a84734c7a 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o -obj-$(CONFIG_DRM_CDNS_MHDP) += cdns-mhdp-common.o +obj-$(CONFIG_DRM_CDNS_MHDP) += cdns-mhdp.o cdns-mhdp-common.o obj-$(CONFIG_DRM_DUMB_VGA_DAC) += dumb-vga-dac.o obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o diff --git a/drivers/gpu/drm/bridge/cdns-mhdp-common.c b/drivers/gpu/drm/bridge/cdns-mhdp-common.c index 813319481220..5c426b04cf65 100644 --- a/drivers/gpu/drm/bridge/cdns-mhdp-common.c +++ b/drivers/gpu/drm/bridge/cdns-mhdp-common.c @@ -191,7 +191,55 @@ static int cdns_mhdp_mailbox_send(struct cdns_mhdp_device *mhdp, u8 module_id, return 0; }
-static int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val) +int cdns_mhdp_reg_read(struct cdns_mhdp_device *mhdp, u32 addr, u32 *value) +{ + u8 msg[4], resp[8]; + int ret; + + if (addr == 0) { + ret = -EINVAL; + goto err_reg_read; + } + + msg[0] = (u8)(addr >> 24); + msg[1] = (u8)(addr >> 16); + msg[2] = (u8)(addr >> 8); + msg[3] = (u8)addr; + + ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_GENERAL, + GENERAL_REGISTER_READ, + sizeof(msg), msg); + if (ret) + goto err_reg_read; + + ret = cdns_mhdp_mailbox_validate_receive(mhdp, MB_MODULE_ID_GENERAL, + GENERAL_REGISTER_READ, + sizeof(resp)); + if (ret) + goto err_reg_read; + + ret = cdns_mhdp_mailbox_read_receive(mhdp, resp, sizeof(resp)); + if (ret) + goto err_reg_read; + + /* Returned address value should be the same as requested */ + if (memcmp(msg, resp, sizeof(msg))) { + ret = -EINVAL; + goto err_reg_read; + } + + *value = (resp[4] << 24) | (resp[5] << 16) | (resp[6] << 8) | resp[7]; + +err_reg_read: + if (ret) { + DRM_DEV_ERROR(mhdp->dev, "Failed to read register.\n"); + *value = 0; + } + + return ret; +} + +int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val) { u8 msg[6];
@@ -205,7 +253,7 @@ static int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val) DPTX_WRITE_REGISTER, sizeof(msg), msg); }
-static int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr, +int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr, u8 start_bit, u8 bits_no, u32 val) { u8 field[8]; @@ -979,3 +1027,61 @@ int cdns_mhdp_audio_config(struct cdns_mhdp_device *mhdp, DRM_DEV_ERROR(mhdp->dev, "audio config failed: %d\n", ret); return ret; } + +int cdns_mhdp_adjust_lt(struct cdns_mhdp_device *mhdp, + u8 nlanes, u16 udelay, u8 *lanes_data, u8 *dpcd) +{ + u8 payload[7]; + u8 hdr[5]; /* For DPCD read response header */ + u32 addr; + u8 const nregs = 6; /* Registers 0x202-0x207 */ + int ret; + + if (nlanes != 4 && nlanes != 2 && nlanes != 1) { + DRM_DEV_ERROR(mhdp->dev, "invalid number of lanes: %d\n", + nlanes); + ret = -EINVAL; + goto err_adjust_lt; + } + + payload[0] = nlanes; + payload[1] = (u8)(udelay >> 8); + payload[2] = (u8)udelay; + + payload[3] = lanes_data[0]; + if (nlanes > 1) + payload[4] = lanes_data[1]; + if (nlanes > 2) { + payload[5] = lanes_data[2]; + payload[6] = lanes_data[3]; + } + + ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, + DPTX_ADJUST_LT, + sizeof(payload), payload); + if (ret) + goto err_adjust_lt; + + /* Yes, read the DPCD read command response */ + ret = cdns_mhdp_mailbox_validate_receive(mhdp, MB_MODULE_ID_DP_TX, + DPTX_READ_DPCD, + sizeof(hdr) + nregs); + if (ret) + goto err_adjust_lt; + + ret = cdns_mhdp_mailbox_read_receive(mhdp, hdr, sizeof(hdr)); + if (ret) + goto err_adjust_lt; + + addr = (hdr[2] << 24) | (hdr[3] << 8) | hdr[4]; + if (addr != DP_LANE0_1_STATUS) + goto err_adjust_lt; + + ret = cdns_mhdp_mailbox_read_receive(mhdp, dpcd, nregs); + +err_adjust_lt: + if (ret) + DRM_DEV_ERROR(mhdp->dev, "Failed to adjust Link Training.\n"); + + return ret; +} diff --git a/drivers/gpu/drm/bridge/cdns-mhdp-common.h b/drivers/gpu/drm/bridge/cdns-mhdp-common.h index b0101f10594a..bdebe9e0a640 100644 --- a/drivers/gpu/drm/bridge/cdns-mhdp-common.h +++ b/drivers/gpu/drm/bridge/cdns-mhdp-common.h @@ -330,6 +330,7 @@ #define GENERAL_TEST_ECHO 0x02 #define GENERAL_BUS_SETTINGS 0x03 #define GENERAL_TEST_ACCESS 0x04 +#define GENERAL_REGISTER_READ 0x07
#define DPTX_SET_POWER_MNG 0x00 #define DPTX_SET_HOST_CAPABILITIES 0x01 @@ -349,6 +350,7 @@ #define DPTX_SET_LINK_BREAK_POINT 0x0f #define DPTX_FORCE_LANES 0x10 #define DPTX_HPD_STATE 0x11 +#define DPTX_ADJUST_LT 0x12
#define FW_STANDBY 0 #define FW_ACTIVE 1 @@ -554,4 +556,13 @@ int cdns_mhdp_audio_stop(struct cdns_mhdp_device *mhdp, int cdns_mhdp_audio_mute(struct cdns_mhdp_device *mhdp, bool enable); int cdns_mhdp_audio_config(struct cdns_mhdp_device *mhdp, struct audio_info *audio); +int cdns_mhdp_register_read(struct cdns_mhdp_device *mhdp, u32 addr, + u32 *value); +int cdns_mhdp_reg_read(struct cdns_mhdp_device *mhdp, u32 addr, u32 *value); +int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val); +int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr, + u8 start_bit, u8 bits_no, u32 val); +int cdns_mhdp_adjust_lt(struct cdns_mhdp_device *mhdp, u8 nlanes, + u16 udelay, u8 *lanes_data, + u8 *dpcd); #endif /* CDNS_MHDP_COMMON_H_ */ diff --git a/drivers/gpu/drm/bridge/cdns-mhdp.c b/drivers/gpu/drm/bridge/cdns-mhdp.c new file mode 100644 index 000000000000..e31a1a11c96f --- /dev/null +++ b/drivers/gpu/drm/bridge/cdns-mhdp.c @@ -0,0 +1,1233 @@ +// SPDX-License-Identifier: GPL v2 +/* + * Cadence MHDP DP bridge driver. + * + * Copyright: 2018 Cadence Design Systems, Inc. + * + * Author: Quentin Schulz quentin.schulz@free-electrons.com + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/firmware.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_bridge.h> +#include <drm/drm_connector.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_dp_helper.h> +#include <drm/drm_modeset_helper_vtables.h> + +#include "cdns-mhdp-common.h" + +#define DEBUG_MSG + +#define IRAM_FW_NAME "cadence_mhdp_iram_fw.bin" +#define DRAM_FW_NAME "cadence_mhdp_dram_fw.bin" + +#define CDNS_APB_CFG 0x00000 +#define CDNS_APB_CTRL (CDNS_APB_CFG + 0x00) +#define CDNS_MAILBOX_FULL (CDNS_APB_CFG + 0x08) +#define CDNS_MAILBOX_EMPTY (CDNS_APB_CFG + 0x0c) +#define CDNS_MAILBOX_TX_DATA (CDNS_APB_CFG + 0x10) +#define CDNS_MAILBOX_RX_DATA (CDNS_APB_CFG + 0x14) +#define CDNS_KEEP_ALIVE (CDNS_APB_CFG + 0x18) +#define CDNS_KEEP_ALIVE_MASK GENMASK(7, 0) + +#define CDNS_SW_CLK_L (CDNS_APB_CFG + 0x3c) +#define CDNS_SW_CLK_H (CDNS_APB_CFG + 0x40) +#define CDNS_SW_EVENT0 (CDNS_APB_CFG + 0x44) +#define CDNS_DPTX_HPD BIT(0) + +#define CDNS_SW_EVENT1 (CDNS_APB_CFG + 0x48) +#define CDNS_SW_EVENT2 (CDNS_APB_CFG + 0x4c) +#define CDNS_SW_EVENT3 (CDNS_APB_CFG + 0x50) + +#define CDNS_SOURCE_VIDEO_INTERFACE 0x00b00 +#define CDNS_BND_HSYNC2VSYNC (CDNS_SOURCE_VIDEO_INTERFACE + \ + 0x00) +#define CDNS_IP_DTCT_WIN GENMASK(11, 0) +#define CDNS_IP_DET_INTERLACE_FORMAT BIT(12) +#define CDNS_IP_BYPASS_V_INTERFACE BIT(13) + +#define CDNS_HSYNC2VSYNC_POL_CTRL (CDNS_SOURCE_VIDEO_INTERFACE + \ + 0x10) +#define CDNS_H2V_HSYNC_POL_ACTIVE_LOW BIT(1) +#define CDNS_H2V_VSYNC_POL_ACTIVE_LOW BIT(2) + +#define CDNS_DPTX_PHY_CONFIG 0x02000 +#define CDNS_PHY_TRAINING_EN BIT(0) +#define CDNS_PHY_TRAINING_TYPE(x) (((x) & GENMASK(3, 0)) << 1) +#define CDNS_PHY_SCRAMBLER_BYPASS BIT(5) +#define CDNS_PHY_ENCODER_BYPASS BIT(6) +#define CDNS_PHY_SKEW_BYPASS BIT(7) +#define CDNS_PHY_TRAINING_AUTO BIT(8) +#define CDNS_PHY_LANE0_SKEW(x) (((x) & GENMASK(2, 0)) << 9) +#define CDNS_PHY_LANE1_SKEW(x) (((x) & GENMASK(2, 0)) << 12) +#define CDNS_PHY_LANE2_SKEW(x) (((x) & GENMASK(2, 0)) << 15) +#define CDNS_PHY_LANE3_SKEW(x) (((x) & GENMASK(2, 0)) << 18) +#define CDNS_PHY_COMMON_CONFIG (CDNS_PHY_LANE1_SKEW(1) | \ + CDNS_PHY_LANE2_SKEW(2) | \ + CDNS_PHY_LANE3_SKEW(3)) +#define CDNS_PHY_10BIT_EN BIT(21) + +#define CDNS_DPTX_FRAMER 0x02200 +#define CDNS_DP_FRAMER_GLOBAL_CONFIG (CDNS_DPTX_FRAMER + 0x00) +#define CDNS_DP_NUM_LANES(x) (x - 1) +#define CDNS_DP_FRAMER_EN BIT(3) +#define CDNS_DP_RATE_GOVERNOR_EN BIT(4) +#define CDNS_DP_NO_VIDEO_MODE BIT(5) +#define CDNS_DP_DISABLE_PHY_RST BIT(6) +#define CDNS_DP_WR_FAILING_EDGE_VSYNC BIT(7) + +#define CDNS_DP_SW_RESET (CDNS_DPTX_FRAMER + 0x04) +#define CDNS_DP_FRAMER_TU (CDNS_DPTX_FRAMER + 0x08) +#define CDNS_DP_FRAMER_TU_SIZE(x) (((x) & GENMASK(6, 0)) << 8) +#define CDNS_DP_FRAMER_TU_VS(x) ((x) & GENMASK(5, 0)) +#define CDNS_DP_FRAMER_TU_CNT_RST_EN BIT(15) + +#define CDNS_DPTX_STREAM 0x03000 +#define CDNS_DP_MSA_HORIZONTAL_0 (CDNS_DPTX_STREAM + 0x00) +#define CDNS_DP_MSAH0_H_TOTAL(x) (x) +#define CDNS_DP_MSAH0_HSYNC_START(x) ((x) << 16) + +#define CDNS_DP_MSA_HORIZONTAL_1 (CDNS_DPTX_STREAM + 0x04) +#define CDNS_DP_MSAH1_HSYNC_WIDTH(x) (x) +#define CDNS_DP_MSAH1_HSYNC_POL_LOW BIT(15) +#define CDNS_DP_MSAH1_HDISP_WIDTH(x) ((x) << 16) + +#define CDNS_DP_MSA_VERTICAL_0 (CDNS_DPTX_STREAM + 0x08) +#define CDNS_DP_MSAV0_V_TOTAL(x) (x) +#define CDNS_DP_MSAV0_VSYNC_START(x) ((x) << 16) + +#define CDNS_DP_MSA_VERTICAL_1 (CDNS_DPTX_STREAM + 0x0c) +#define CDNS_DP_MSAV1_VSYNC_WIDTH(x) (x) +#define CDNS_DP_MSAV1_VSYNC_POL_LOW BIT(15) +#define CDNS_DP_MSAV1_VDISP_WIDTH(x) ((x) << 16) + +#define CDNS_DP_MSA_MISC (CDNS_DPTX_STREAM + 0x10) +#define CDNS_DP_STREAM_CONFIG (CDNS_DPTX_STREAM + 0x14) +#define CDNS_DP_RATE_GOVERNOR_STATUS (CDNS_DPTX_STREAM + 0x2c) +#define CDNS_DP_RG_TU_VS_DIFF(x) ((x) << 8) + +#define CDNS_DP_HORIZONTAL (CDNS_DPTX_STREAM + 0x30) +#define CDNS_DP_H_HSYNC_WIDTH(x) (x) +#define CDNS_DP_H_H_TOTAL(x) ((x) << 16) + +#define CDNS_DP_VERTICAL_0 (CDNS_DPTX_STREAM + 0x34) +#define CDNS_DP_V0_VHEIGHT(x) (x) +#define CDNS_DP_V0_VSTART(x) ((x) << 16) + +#define CDNS_DP_VERTICAL_1 (CDNS_DPTX_STREAM + 0x38) +#define CDNS_DP_V1_VTOTAL(x) (x) +#define CDNS_DP_V1_VTOTAL_EVEN BIT(16) + +#define CDNS_DP_FRAMER_PXL_REPR (CDNS_DPTX_STREAM + 0x4c) +#define CDNS_DP_FRAMER_6_BPC BIT(0) +#define CDNS_DP_FRAMER_8_BPC BIT(1) +#define CDNS_DP_FRAMER_10_BPC BIT(2) +#define CDNS_DP_FRAMER_12_BPC BIT(3) +#define CDNS_DP_FRAMER_16_BPC BIT(4) +#define CDNS_DP_FRAMER_PXL_FORMAT 0x8 +#define CDNS_DP_FRAMER_RGB BIT(0) +#define CDNS_DP_FRAMER_YCBCR444 BIT(1) +#define CDNS_DP_FRAMER_YCBCR422 BIT(2) +#define CDNS_DP_FRAMER_YCBCR420 BIT(3) +#define CDNS_DP_FRAMER_Y_ONLY BIT(4) + +#define CDNS_DP_FRAMER_SP (CDNS_DPTX_STREAM + 0x10) +#define CDNS_DP_FRAMER_VSYNC_POL_LOW BIT(0) +#define CDNS_DP_FRAMER_HSYNC_POL_LOW BIT(1) +#define CDNS_DP_FRAMER_INTERLACE BIT(2) + +#define CDNS_DP_LINE_THRESH (CDNS_DPTX_STREAM + 0x64) +#define CDNS_DP_VB_ID (CDNS_DPTX_STREAM + 0x68) +#define CDNS_DP_VB_ID_INTERLACED BIT(2) + +#define CDNS_DP_FRONT_BACK_PORCH (CDNS_DPTX_STREAM + 0x78) +#define CDNS_DP_BACK_PORCH(x) (x) +#define CDNS_DP_FRONT_PORCH(x) ((x) << 16) + +#define CDNS_DP_BYTE_COUNT (CDNS_DPTX_STREAM + 0x7c) + +#define CDNS_DPTX_GLOBAL 0x02300 +#define CDNS_DP_LANE_EN (CDNS_DPTX_GLOBAL + 0x00) +#define CDNS_DP_LANE_EN_LANES(x) GENMASK(x - 1, 0) +#define CDNS_DP_ENHNCD (CDNS_DPTX_GLOBAL + 0x04) + +#define CDNS_MHDP_IMEM 0x10000 +#define CDNS_MHDP_DMEM 0x20000 + +#define CDNS_DP_TRAINING_PATTERN_4 0x7 + +/* 3min delay because of EDID mb being VERY slow */ +/* FIXME: should be >615000 when upstreaming */ +#define CDNS_TIMEOUT_MAILBOX (1000 * 1000 * 60 * 3) + +/* FIXME: Should be 2000 */ +#define CDNS_KEEP_ALIVE_TIMEOUT 40000 +#define CDNS_SW_EVENT0_TIMEOUT 40000 + +static const struct of_device_id mhdp_ids[] = { + { .compatible = "cdns,mhdp8546", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mhdp_ids); + +#define CDNS_LANE_1 BIT(0) +#define CDNS_LANE_2 BIT(1) +#define CDNS_LANE_4 BIT(2) +#define CDNS_SSC BIT(3) +#define CDNS_SCRAMBLER BIT(4) + +#define CDNS_VOLT_SWING(x) ((x) & GENMASK(1, 0)) +#define CDNS_FORCE_VOLT_SWING BIT(2) + +#define CDNS_PRE_EMPHASIS(x) ((x) & GENMASK(1, 0)) +#define CDNS_FORCE_PRE_EMPHASIS BIT(2) + +#define CDNS_SUPPORT_TPS(x) BIT((x) - 1) + +#define CDNS_FAST_LINK_TRAINING BIT(0) + +#define CDNS_LANE_MAPPING_TYPE_C_LANE_0(x) ((x) & GENMASK(1, 0)) +#define CDNS_LANE_MAPPING_TYPE_C_LANE_1(x) ((x) & GENMASK(3, 2)) +#define CDNS_LANE_MAPPING_TYPE_C_LANE_2(x) ((x) & GENMASK(5, 4)) +#define CDNS_LANE_MAPPING_TYPE_C_LANE_3(x) ((x) & GENMASK(7, 6)) +#define CDNS_LANE_MAPPING_NORMAL 0xe4 +#define CDNS_LANE_MAPPING_FLIPPED 0x1b + +#define CDNS_DP_MAX_NUM_LANES 4 +#define CDNS_DP_TEST_VSC_SDP (1 << 6) /* 1.3+ */ +#define CDNS_DP_TEST_COLOR_FORMAT_RAW_Y_ONLY (1 << 7) + +static inline struct cdns_mhdp_device *connector_to_mhdp( + struct drm_connector *conn) +{ + return container_of(conn, struct cdns_mhdp_device, connector); +} + +static inline struct cdns_mhdp_device *bridge_to_mhdp( + struct drm_bridge *bridge) +{ + return container_of(bridge, struct cdns_mhdp_device, bridge); +} + +static unsigned int max_link_rate(struct cdns_mhdp_host host, + struct cdns_mhdp_sink sink) +{ + return min(host.link_rate, sink.link_rate); +} + +static u8 eq_training_pattern_supported(struct cdns_mhdp_host host, + struct cdns_mhdp_sink sink) +{ + return fls(host.pattern_supp & sink.pattern_supp); +} + +static ssize_t mhdp_transfer(struct drm_dp_aux *aux, + struct drm_dp_aux_msg *msg) +{ + struct cdns_mhdp_device *mhdp = dev_get_drvdata(aux->dev); + int ret; + + if (msg->request != DP_AUX_NATIVE_WRITE && + msg->request != DP_AUX_NATIVE_READ) + return -ENOTSUPP; + + if (msg->request == DP_AUX_NATIVE_WRITE) { + int i; + + for (i = 0; i < msg->size; ++i) { + ret = cdns_mhdp_dpcd_write(mhdp, + msg->address + i, + *((u8 *)msg->buffer + i)); + if (!ret) + continue; + + DRM_DEV_ERROR(mhdp->dev, "Failed to write DPCD\n"); + + return i; + } + } else { + ret = cdns_mhdp_dpcd_read(mhdp, msg->address, + msg->buffer, msg->size); + if (ret) { + DRM_DEV_ERROR(mhdp->dev, "Failed to read DPCD\n"); + return 0; + } + } + + return msg->size; +} + +static int cdns_mhdp_get_modes(struct drm_connector *connector) +{ + struct cdns_mhdp_device *mhdp = connector_to_mhdp(connector); + struct edid *edid; + int num_modes; + + edid = drm_do_get_edid(connector, cdns_mhdp_get_edid_block, mhdp); + + drm_connector_update_edid_property(connector, edid); + + num_modes = drm_add_edid_modes(connector, edid); + + return num_modes; +} + +static const struct drm_connector_helper_funcs cdns_mhdp_conn_helper_funcs = { + .get_modes = cdns_mhdp_get_modes, +}; + +static enum drm_connector_status cdns_mhdp_detect(struct drm_connector *conn, + bool force) +{ + struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn); + enum drm_connector_status status = connector_status_disconnected; + int ret; + + ret = cdns_mhdp_get_hpd_status(mhdp); + if (ret > 0) + status = connector_status_connected; + else if (ret < 0) + dev_err(mhdp->dev, "Failed to obtain HPD state\n"); + + return status; +} + +static const struct drm_connector_funcs cdns_mhdp_conn_funcs = { + .fill_modes = drm_helper_probe_single_connector_modes, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, + .reset = drm_atomic_helper_connector_reset, + .destroy = drm_connector_cleanup, + .dpms = drm_helper_connector_dpms, + .detect = cdns_mhdp_detect, +}; + +static int cdns_mhdp_attach(struct drm_bridge *bridge) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + struct drm_connector *conn = &mhdp->connector; + int ret; + + conn->polled = DRM_CONNECTOR_POLL_CONNECT | + DRM_CONNECTOR_POLL_DISCONNECT; + + ret = drm_connector_init(bridge->dev, conn, &cdns_mhdp_conn_funcs, + DRM_MODE_CONNECTOR_DisplayPort); + if (ret) { + dev_err(mhdp->dev, "failed to init connector\n"); + return ret; + } + + drm_connector_helper_add(conn, &cdns_mhdp_conn_helper_funcs); + + ret = drm_connector_attach_encoder(conn, bridge->encoder); + if (ret) { + dev_err(mhdp->dev, "failed to attach connector to encoder\n"); + return ret; + } + + return 0; +} + +enum pixel_format { + PIXEL_FORMAT_RGB = 1, + PIXEL_FORMAT_YCBCR_444 = 2, + PIXEL_FORMAT_YCBCR_422 = 4, + PIXEL_FORMAT_YCBCR_420 = 8, + PIXEL_FORMAT_Y_ONLY = 16, +}; + +static void mhdp_link_training_init(struct cdns_mhdp_device *mhdp) +{ + u32 reg32; + + drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_DISABLE); + + /* Reset PHY configuration */ + reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1); + if (!(mhdp->host.lanes_cnt & CDNS_SCRAMBLER)) + reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; + + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_ENHNCD, + mhdp->sink.enhanced & mhdp->host.enhanced); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_LANE_EN, + CDNS_DP_LANE_EN_LANES(mhdp->link.num_lanes)); + + drm_dp_link_configure(&mhdp->aux, &mhdp->link); + + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, + CDNS_PHY_COMMON_CONFIG | + CDNS_PHY_TRAINING_EN | + CDNS_PHY_TRAINING_TYPE(1) | + CDNS_PHY_SCRAMBLER_BYPASS); + + drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE); +} + +static void mhdp_get_adjust_train(struct cdns_mhdp_device *mhdp, + u8 link_status[DP_LINK_STATUS_SIZE], + u8 lanes_data[CDNS_DP_MAX_NUM_LANES]) +{ + unsigned int i; + u8 adjust, max_pre_emphasis, max_volt_swing; + + max_pre_emphasis = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis) + << DP_TRAIN_PRE_EMPHASIS_SHIFT; + max_volt_swing = CDNS_VOLT_SWING(mhdp->host.volt_swing); + + for (i = 0; i < mhdp->link.num_lanes; i++) { + adjust = drm_dp_get_adjust_request_voltage(link_status, i); + lanes_data[i] = min_t(u8, adjust, max_volt_swing); + if (lanes_data[i] != adjust) + lanes_data[i] |= DP_TRAIN_MAX_SWING_REACHED; + + adjust = drm_dp_get_adjust_request_pre_emphasis(link_status, i); + lanes_data[i] |= min_t(u8, adjust, max_pre_emphasis); + if ((lanes_data[i] >> DP_TRAIN_PRE_EMPHASIS_SHIFT) != adjust) + lanes_data[i] |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; + } +} + +static void mhdp_set_adjust_request_voltage( + u8 link_status[DP_LINK_STATUS_SIZE], int lane, u8 volt) +{ + int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1); + int s = ((lane & 1) ? + DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : + DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT); + int idx = i - DP_LANE0_1_STATUS; + + link_status[idx] &= ~(DP_ADJUST_VOLTAGE_SWING_LANE0_MASK << s); + link_status[idx] |= volt << s; +} + +static void mhdp_set_adjust_request_pre_emphasis( + u8 link_status[DP_LINK_STATUS_SIZE], int lane, u8 pre_emphasis) +{ + int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1); + int s = ((lane & 1) ? + DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT : + DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT); + int idx = i - DP_LANE0_1_STATUS; + + link_status[idx] &= ~(DP_ADJUST_PRE_EMPHASIS_LANE0_MASK << s); + link_status[idx] |= pre_emphasis << s; +} + +static void mhdp_adjust_requested_eq(struct cdns_mhdp_device *mhdp, + u8 link_status[DP_LINK_STATUS_SIZE]) +{ + unsigned int i; + u8 pre, volt, max_pre = CDNS_VOLT_SWING(mhdp->host.volt_swing), + max_volt = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis); + + for (i = 0; i < mhdp->link.num_lanes; i++) { + volt = drm_dp_get_adjust_request_voltage(link_status, i); + pre = drm_dp_get_adjust_request_pre_emphasis(link_status, i); + if (volt + pre > 3) + mhdp_set_adjust_request_voltage(link_status, i, + 3 - pre); + if (mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING) + mhdp_set_adjust_request_voltage(link_status, i, + max_volt); + if (mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS) + mhdp_set_adjust_request_pre_emphasis(link_status, i, + max_pre); + } +} + +static bool mhdp_link_training_channel_eq(struct cdns_mhdp_device *mhdp, + u8 eq_tps, + unsigned int training_interval) +{ + u8 lanes_data[CDNS_DP_MAX_NUM_LANES], fail_counter_short = 0; + u8 dpcd[DP_LINK_STATUS_SIZE]; + u32 reg32; + + dev_dbg(mhdp->dev, "Link training - Starting EQ phase\n"); + + /* Enable link training TPS[eq_tps] in PHY */ + reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_EN | + CDNS_PHY_TRAINING_TYPE(eq_tps); + if (eq_tps != 4) + reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); + + drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, + (eq_tps != 4) ? eq_tps | DP_LINK_SCRAMBLING_DISABLE : + CDNS_DP_TRAINING_PATTERN_4); + + drm_dp_dpcd_read_link_status(&mhdp->aux, dpcd); + + do { + mhdp_get_adjust_train(mhdp, dpcd, lanes_data); + + cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes, + training_interval, lanes_data, dpcd); + + if (!drm_dp_clock_recovery_ok(dpcd, mhdp->link.num_lanes)) + goto err; + + if (drm_dp_channel_eq_ok(dpcd, mhdp->link.num_lanes)) { + dev_dbg(mhdp->dev, + "Link training: EQ phase succeeded\n"); + return true; + } + + fail_counter_short++; + + mhdp_adjust_requested_eq(mhdp, dpcd); + } while (fail_counter_short < 5); + +err: + dev_dbg(mhdp->dev, + "Link training - EQ phase failed for %d lanes and %d rate\n", + mhdp->link.num_lanes, mhdp->link.rate); + + return false; +} + +static void mhdp_adjust_requested_cr(struct cdns_mhdp_device *mhdp, + u8 link_status[DP_LINK_STATUS_SIZE], + u8 *req_volt, u8 *req_pre) +{ + unsigned int i, max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing), + max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis); + + for (i = 0; i < mhdp->link.num_lanes; i++) { + if (mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING) + mhdp_set_adjust_request_voltage(link_status, i, + max_volt); + else + mhdp_set_adjust_request_voltage(link_status, i, + req_volt[i]); + + if (mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS) + mhdp_set_adjust_request_pre_emphasis(link_status, i, + max_pre); + else + mhdp_set_adjust_request_pre_emphasis(link_status, i, + req_pre[i]); + } +} + +static void mhdp_validate_cr(struct cdns_mhdp_device *mhdp, bool *cr_done, + bool *same_before_adjust, bool *max_swing_reached, + u8 before_cr[DP_LINK_STATUS_SIZE], + u8 after_cr[DP_LINK_STATUS_SIZE], u8 *req_volt, + u8 *req_pre) +{ + unsigned int i; + u8 tmp, max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing), + max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis), lane_status; + bool same_pre, same_volt; + + *same_before_adjust = false; + *max_swing_reached = false; + *cr_done = true; + + for (i = 0; i < mhdp->link.num_lanes; i++) { + tmp = drm_dp_get_adjust_request_voltage(after_cr, i); + req_volt[i] = min_t(u8, tmp, max_volt); + + tmp = drm_dp_get_adjust_request_pre_emphasis(after_cr, i) >> + DP_TRAIN_PRE_EMPHASIS_SHIFT; + req_pre[i] = min_t(u8, tmp, max_pre); + + same_pre = (before_cr[i] & DP_TRAIN_PRE_EMPHASIS_MASK) == + (req_pre[i] << DP_TRAIN_PRE_EMPHASIS_SHIFT); + same_volt = (before_cr[i] & DP_TRAIN_VOLTAGE_SWING_MASK) == + req_volt[i]; + if (same_pre && same_volt) + *same_before_adjust = true; + + lane_status = drm_dp_get_lane_status(after_cr, i); + if (!(lane_status & DP_LANE_CR_DONE)) { + *cr_done = false; + /* 3.1.5.2 in DP Standard v1.4. Table 3-1 */ + if (req_volt[i] + req_pre[i] >= 3) { + *max_swing_reached = true; + return; + } + } + } +} + +static bool mhdp_link_training_clock_recovery(struct cdns_mhdp_device *mhdp) +{ + u8 lanes_data[CDNS_DP_MAX_NUM_LANES], fail_counter_short = 0, + fail_counter_cr_long = 0; + u8 dpcd[DP_LINK_STATUS_SIZE]; + bool cr_done; + + dev_dbg(mhdp->dev, "Link training starting CR phase\n"); + + mhdp_link_training_init(mhdp); + + drm_dp_dpcd_read_link_status(&mhdp->aux, dpcd); + + do { + u8 requested_adjust_volt_swing[CDNS_DP_MAX_NUM_LANES] = {}, + requested_adjust_pre_emphasis[CDNS_DP_MAX_NUM_LANES] = {}; + bool same_before_adjust, max_swing_reached; + + mhdp_get_adjust_train(mhdp, dpcd, lanes_data); + + cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes, 100, + lanes_data, dpcd); + + mhdp_validate_cr(mhdp, &cr_done, &same_before_adjust, + &max_swing_reached, lanes_data, dpcd, + requested_adjust_volt_swing, + requested_adjust_pre_emphasis); + + if (max_swing_reached) + goto err; + + if (cr_done) { + dev_dbg(mhdp->dev, + "Link training: CR phase succeeded\n"); + return true; + } + + /* Not all CR_DONE bits set */ + fail_counter_cr_long++; + + if (same_before_adjust) { + fail_counter_short++; + continue; + } + + fail_counter_short = 0; + /* + * Voltage swing/pre-emphasis adjust requested + * during CR phase + */ + mhdp_adjust_requested_cr(mhdp, dpcd, + requested_adjust_volt_swing, + requested_adjust_pre_emphasis); + } while (fail_counter_short < 5 && fail_counter_cr_long < 10); + +err: + dev_dbg(mhdp->dev, + "Link training: CR phase failed for %d lanes and %d rate\n", + mhdp->link.num_lanes, mhdp->link.rate); + + return false; +} + +static void lower_link_rate(struct drm_dp_link *link) +{ + switch (drm_dp_link_rate_to_bw_code(link->rate)) { + case DP_LINK_BW_2_7: + link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_1_62); + break; + case DP_LINK_BW_5_4: + link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_2_7); + break; + case DP_LINK_BW_8_1: + link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4); + break; + } +} + +static int mhdp_link_training(struct cdns_mhdp_device *mhdp, + unsigned int video_mode, + unsigned int training_interval) +{ + u32 reg32; + u8 eq_tps = eq_training_pattern_supported(mhdp->host, mhdp->sink); + + while (1) { + if (!mhdp_link_training_clock_recovery(mhdp)) { + if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) != + DP_LINK_BW_1_62) { + dev_dbg(mhdp->dev, + "Reducing link rate during CR phase\n"); + lower_link_rate(&mhdp->link); + drm_dp_link_configure(&mhdp->aux, &mhdp->link); + + continue; + } else if (mhdp->link.num_lanes > 1) { + dev_dbg(mhdp->dev, + "Reducing lanes number during CR phase\n"); + mhdp->link.num_lanes >>= 1; + mhdp->link.rate = max_link_rate(mhdp->host, + mhdp->sink); + drm_dp_link_configure(&mhdp->aux, &mhdp->link); + + continue; + } + + dev_dbg(mhdp->dev, + "Link training failed during CR phase\n"); + goto err; + } + + if (mhdp_link_training_channel_eq(mhdp, eq_tps, + training_interval)) + break; + + if (mhdp->link.num_lanes > 1) { + dev_dbg(mhdp->dev, + "Reducing lanes number during EQ phase\n"); + mhdp->link.num_lanes >>= 1; + drm_dp_link_configure(&mhdp->aux, &mhdp->link); + + continue; + } else if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) != + DP_LINK_BW_1_62) { + dev_dbg(mhdp->dev, + "Reducing link rate during EQ phase\n"); + lower_link_rate(&mhdp->link); + drm_dp_link_configure(&mhdp->aux, &mhdp->link); + + continue; + } + + dev_dbg(mhdp->dev, "Link training failed during EQ phase\n"); + goto err; + } + + dev_dbg(mhdp->dev, "Link training successful\n"); + + drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, + (mhdp->host.lanes_cnt & CDNS_SCRAMBLER) ? 0 : + DP_LINK_SCRAMBLING_DISABLE); + + /* SW reset DPTX framer */ + cdns_mhdp_reg_write(mhdp, CDNS_DP_SW_RESET, 1); + cdns_mhdp_reg_write(mhdp, CDNS_DP_SW_RESET, 0); + + /* Enable framer */ + /* FIXME: update when MST supported, BIT(2) */ + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, + CDNS_DP_FRAMER_EN | + CDNS_DP_NUM_LANES(mhdp->link.num_lanes) | + CDNS_DP_DISABLE_PHY_RST | + CDNS_DP_WR_FAILING_EDGE_VSYNC | + (!video_mode ? CDNS_DP_NO_VIDEO_MODE : 0)); + + /* Reset PHY config */ + reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1); + if (!(mhdp->host.lanes_cnt & CDNS_SCRAMBLER)) + reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); + + return 0; +err: + /* Reset PHY config */ + reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1); + if (!(mhdp->host.lanes_cnt & CDNS_SCRAMBLER)) + reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; + cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); + + drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_DISABLE); + + return -EIO; +} + +static void cdns_mhdp_disable(struct drm_bridge *bridge) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + + cdns_mhdp_set_video_status(mhdp, 0); + + drm_dp_link_power_down(&mhdp->aux, &mhdp->link); +} + +static void cdns_mhdp_enable(struct drm_bridge *bridge) +{ + struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); + struct drm_display_mode *mode; + struct drm_display_info *disp_info = &mhdp->connector.display_info; + enum pixel_format pxlfmt; + int pxlclock; + unsigned int rate, tu_size = 30, vs, vs_f, bpp, required_bandwidth, + available_bandwidth, dp_framer_sp = 0, msa_horizontal_1, + msa_vertical_1, bnd_hsync2vsync, hsync2vsync_pol_ctrl, + misc0 = 0, misc1 = 0, line_thresh = 0, pxl_repr, + front_porch, back_porch, msa_h0, msa_v0, hsync, vsync, + dp_vertical_1, line_thresh1, line_thresh2; + u32 resp; + + unsigned int size = DP_RECEIVER_CAP_SIZE, dp_framer_global_config, + video_mode, training_interval_us; + u8 reg0[size], reg8, amp[2]; + + mode = &bridge->encoder->crtc->state->adjusted_mode; + pxlclock = mode->crtc_clock; + + /* + * Upon power-on reset/device disconnection: [2:0] bits should be 0b001 + * and [7:5] bits 0b000. + */ + drm_dp_dpcd_writeb(&mhdp->aux, DP_SET_POWER, 1); + + drm_dp_link_probe(&mhdp->aux, &mhdp->link); + + dev_dbg(mhdp->dev, "Set sink device power state via DPCD\n"); + drm_dp_link_power_up(&mhdp->aux, &mhdp->link); + /* FIXME (CDNS): do we have to wait for 100ms before going on? */ + mdelay(100); + + mhdp->sink.link_rate = mhdp->link.rate; + mhdp->sink.lanes_cnt = mhdp->link.num_lanes; + mhdp->sink.enhanced = !!(mhdp->link.capabilities & + DP_LINK_CAP_ENHANCED_FRAMING); + + drm_dp_dpcd_read(&mhdp->aux, DP_DPCD_REV, reg0, size); + + mhdp->sink.pattern_supp = CDNS_SUPPORT_TPS(1) | CDNS_SUPPORT_TPS(2); + if (drm_dp_tps3_supported(reg0)) + mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(3); + if (drm_dp_tps4_supported(reg0)) + mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(4); + + mhdp->sink.fast_link = !!(reg0[DP_MAX_DOWNSPREAD] & + DP_NO_AUX_HANDSHAKE_LINK_TRAINING); + + mhdp->link.rate = max_link_rate(mhdp->host, mhdp->sink); + mhdp->link.num_lanes = min_t(u8, mhdp->sink.lanes_cnt, + mhdp->host.lanes_cnt & GENMASK(2, 0)); + + reg8 = reg0[DP_TRAINING_AUX_RD_INTERVAL] & + DP_TRAINING_AUX_RD_MASK; + switch (reg8) { + case 0: + training_interval_us = 400; + break; + case 1: + case 2: + case 3: + case 4: + training_interval_us = 4000 << (reg8 - 1); + break; + default: + dev_err(mhdp->dev, + "wrong training interval returned by DPCD: %d\n", reg8); + return; + } + + cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &resp); + + dp_framer_global_config = be32_to_cpu(resp); + + video_mode = !(dp_framer_global_config & CDNS_DP_NO_VIDEO_MODE); + + if (dp_framer_global_config & CDNS_DP_FRAMER_EN) + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, + dp_framer_global_config & + ~CDNS_DP_FRAMER_EN); + + /* Spread AMP if required, enable 8b/10b coding */ + amp[0] = (mhdp->host.lanes_cnt & CDNS_SSC) ? DP_SPREAD_AMP_0_5 : 0; + amp[1] = DP_SET_ANSI_8B10B; + drm_dp_dpcd_write(&mhdp->aux, DP_DOWNSPREAD_CTRL, amp, 2); + + if (mhdp->host.fast_link & mhdp->sink.fast_link) { + /* FIXME: implement fastlink */ + dev_dbg(mhdp->dev, "fastlink\n"); + } else { + if (mhdp_link_training(mhdp, video_mode, + training_interval_us)) { + dev_err(mhdp->dev, "Link training failed. Exiting.\n"); + return; + } + } + + rate = mhdp->link.rate / 1000; + + /* FIXME: what about Y_ONLY? how is it handled in the kernel? */ + if (disp_info->color_formats & DRM_COLOR_FORMAT_YCRCB444) + pxlfmt = PIXEL_FORMAT_YCBCR_444; + else if (disp_info->color_formats & DRM_COLOR_FORMAT_YCRCB422) + pxlfmt = PIXEL_FORMAT_YCBCR_422; + else if (disp_info->color_formats & DRM_COLOR_FORMAT_YCRCB420) + pxlfmt = PIXEL_FORMAT_YCBCR_420; + else + pxlfmt = PIXEL_FORMAT_RGB; + + /* if YCBCR supported and stream not SD, use ITU709 */ + /* FIXME: handle ITU version with YCBCR420 when supported */ + if ((pxlfmt == PIXEL_FORMAT_YCBCR_444 || + pxlfmt == PIXEL_FORMAT_YCBCR_422) && mode->crtc_vdisplay >= 720) + misc0 = DP_YCBCR_COEFFICIENTS_ITU709; + + switch (pxlfmt) { + case PIXEL_FORMAT_RGB: + bpp = disp_info->bpc * 3; + pxl_repr = CDNS_DP_FRAMER_RGB << CDNS_DP_FRAMER_PXL_FORMAT; + misc0 |= DP_COLOR_FORMAT_RGB; + break; + case PIXEL_FORMAT_YCBCR_444: + bpp = disp_info->bpc * 3; + pxl_repr = CDNS_DP_FRAMER_YCBCR444 << CDNS_DP_FRAMER_PXL_FORMAT; + misc0 |= DP_COLOR_FORMAT_YCbCr444 | DP_TEST_DYNAMIC_RANGE_CEA; + break; + case PIXEL_FORMAT_YCBCR_422: + bpp = disp_info->bpc * 2; + pxl_repr = CDNS_DP_FRAMER_YCBCR422 << CDNS_DP_FRAMER_PXL_FORMAT; + misc0 |= DP_COLOR_FORMAT_YCbCr422 | DP_TEST_DYNAMIC_RANGE_CEA; + break; + case PIXEL_FORMAT_YCBCR_420: + bpp = disp_info->bpc * 3 / 2; + pxl_repr = CDNS_DP_FRAMER_YCBCR420 << CDNS_DP_FRAMER_PXL_FORMAT; + break; + default: + bpp = disp_info->bpc; + pxl_repr = CDNS_DP_FRAMER_Y_ONLY << CDNS_DP_FRAMER_PXL_FORMAT; + } + + switch (disp_info->bpc) { + case 6: + misc0 |= DP_TEST_BIT_DEPTH_6; + pxl_repr |= CDNS_DP_FRAMER_6_BPC; + break; + case 8: + misc0 |= DP_TEST_BIT_DEPTH_8; + pxl_repr |= CDNS_DP_FRAMER_8_BPC; + break; + case 10: + misc0 |= DP_TEST_BIT_DEPTH_10; + pxl_repr |= CDNS_DP_FRAMER_10_BPC; + break; + case 12: + misc0 |= DP_TEST_BIT_DEPTH_12; + pxl_repr |= CDNS_DP_FRAMER_12_BPC; + break; + case 16: + misc0 |= DP_TEST_BIT_DEPTH_16; + pxl_repr |= CDNS_DP_FRAMER_16_BPC; + break; + } + + /* find optimal tu_size */ + required_bandwidth = pxlclock * bpp / 8; + available_bandwidth = mhdp->link.num_lanes * rate; + do { + tu_size += 2; + + vs_f = tu_size * required_bandwidth / available_bandwidth; + vs = vs_f / 1000; + vs_f = vs_f % 1000; + /* + * FIXME (CDNS): downspreading? + * It's unused is what I've been told. + */ + } while ((vs == 1 || ((vs_f > 850 || vs_f < 100) && vs_f != 0) || + tu_size - vs < 2) && tu_size < 64); + + if (vs > 64) + return; + + bnd_hsync2vsync = CDNS_IP_BYPASS_V_INTERFACE; + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + bnd_hsync2vsync |= CDNS_IP_DET_INTERLACE_FORMAT; + + cdns_mhdp_reg_write(mhdp, CDNS_BND_HSYNC2VSYNC, bnd_hsync2vsync); + + if (mode->flags & DRM_MODE_FLAG_INTERLACE && + mode->flags & DRM_MODE_FLAG_PHSYNC) + hsync2vsync_pol_ctrl = CDNS_H2V_HSYNC_POL_ACTIVE_LOW | + CDNS_H2V_VSYNC_POL_ACTIVE_LOW; + else + hsync2vsync_pol_ctrl = 0; + + cdns_mhdp_reg_write(mhdp, CDNS_HSYNC2VSYNC_POL_CTRL, + hsync2vsync_pol_ctrl); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_TU, + CDNS_DP_FRAMER_TU_VS(vs) | + CDNS_DP_FRAMER_TU_SIZE(tu_size) | + CDNS_DP_FRAMER_TU_CNT_RST_EN); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_PXL_REPR, pxl_repr); + + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + dp_framer_sp |= CDNS_DP_FRAMER_INTERLACE; + if (mode->flags & DRM_MODE_FLAG_NHSYNC) + dp_framer_sp |= CDNS_DP_FRAMER_HSYNC_POL_LOW; + if (mode->flags & DRM_MODE_FLAG_NVSYNC) + dp_framer_sp |= CDNS_DP_FRAMER_VSYNC_POL_LOW; + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_SP, dp_framer_sp); + + front_porch = mode->crtc_hsync_start - mode->crtc_hdisplay; + back_porch = mode->crtc_htotal - mode->crtc_hsync_end; + cdns_mhdp_reg_write(mhdp, CDNS_DP_FRONT_BACK_PORCH, + CDNS_DP_FRONT_PORCH(front_porch) | + CDNS_DP_BACK_PORCH(back_porch)); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_BYTE_COUNT, + mode->crtc_hdisplay * bpp / 8); + + msa_h0 = mode->crtc_htotal - mode->crtc_hsync_start; + cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_0, + CDNS_DP_MSAH0_H_TOTAL(mode->crtc_htotal) | + CDNS_DP_MSAH0_HSYNC_START(msa_h0)); + + hsync = mode->crtc_hsync_end - mode->crtc_hsync_start; + msa_horizontal_1 = CDNS_DP_MSAH1_HSYNC_WIDTH(hsync) | + CDNS_DP_MSAH1_HDISP_WIDTH(mode->crtc_hdisplay); + if (mode->flags & DRM_MODE_FLAG_NHSYNC) + msa_horizontal_1 |= CDNS_DP_MSAH1_HSYNC_POL_LOW; + cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_1, + msa_horizontal_1); + + msa_v0 = mode->crtc_vtotal - mode->crtc_vsync_start; + cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_0, + CDNS_DP_MSAV0_V_TOTAL(mode->crtc_vtotal) | + CDNS_DP_MSAV0_VSYNC_START(msa_v0)); + + vsync = mode->crtc_vsync_end - mode->crtc_vsync_start; + msa_vertical_1 = CDNS_DP_MSAV1_VSYNC_WIDTH(vsync) | + CDNS_DP_MSAV1_VDISP_WIDTH(mode->crtc_vdisplay); + if (mode->flags & DRM_MODE_FLAG_NVSYNC) + msa_vertical_1 |= CDNS_DP_MSAV1_VSYNC_POL_LOW; + cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_1, msa_vertical_1); + + if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && + mode->crtc_vtotal % 2 == 0) + misc1 = DP_TEST_INTERLACED; + if (pxlfmt == PIXEL_FORMAT_Y_ONLY) + misc1 |= CDNS_DP_TEST_COLOR_FORMAT_RAW_Y_ONLY; + /* FIXME: use VSC SDP for Y420 */ + /* FIXME: (CDNS) no code for Y420 in bare metal test */ + if (pxlfmt == PIXEL_FORMAT_YCBCR_420) + misc1 = CDNS_DP_TEST_VSC_SDP; + + cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_MISC, misc0 | (misc1 << 8)); + + /* FIXME: to be changed if MST mode */ + cdns_mhdp_reg_write(mhdp, CDNS_DP_STREAM_CONFIG, 1); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_HORIZONTAL, + CDNS_DP_H_HSYNC_WIDTH(hsync) | + CDNS_DP_H_H_TOTAL(mode->crtc_hdisplay)); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_0, + CDNS_DP_V0_VHEIGHT(mode->crtc_vdisplay) | + CDNS_DP_V0_VSTART(msa_v0)); + + dp_vertical_1 = CDNS_DP_V1_VTOTAL(mode->crtc_vtotal); + if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && + mode->crtc_vtotal % 2 == 0) + dp_vertical_1 |= CDNS_DP_V1_VTOTAL_EVEN; + + cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_1, dp_vertical_1); + + cdns_mhdp_reg_write_bit(mhdp, CDNS_DP_VB_ID, 2, 1, + (mode->flags & DRM_MODE_FLAG_INTERLACE) ? + CDNS_DP_VB_ID_INTERLACED : 0); + + line_thresh1 = ((vs + 1) << 5) * 8 / bpp; + line_thresh2 = (pxlclock << 5) / 1000 / rate * (vs + 1) - (1 << 5); + line_thresh = line_thresh1 - line_thresh2 / mhdp->link.num_lanes; + line_thresh = (line_thresh >> 5) + 2; + cdns_mhdp_reg_write(mhdp, CDNS_DP_LINE_THRESH, + line_thresh & GENMASK(5, 0)); + + cdns_mhdp_reg_write(mhdp, CDNS_DP_RATE_GOVERNOR_STATUS, + CDNS_DP_RG_TU_VS_DIFF((tu_size - vs > 3) ? + 0 : tu_size - vs)); + + cdns_mhdp_set_video_status(mhdp, 1); +} + +static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = { + .enable = cdns_mhdp_enable, + .disable = cdns_mhdp_disable, + .attach = cdns_mhdp_attach, +}; + +static int load_firmware(struct cdns_mhdp_device *mhdp, const char *name, + unsigned int addr) +{ + const struct firmware *fw; + int ret; + + ret = request_firmware(&fw, name, mhdp->dev); + if (ret) { + dev_err(mhdp->dev, "failed to load firmware (%s), ret: %d\n", + name, ret); + return ret; + } + + memcpy_toio(mhdp->regs + addr, fw->data, fw->size); + + release_firmware(fw); + + return 0; +} + +static int mhdp_probe(struct platform_device *pdev) +{ + struct resource *regs; + struct cdns_mhdp_device *mhdp; + struct clk *clk; + int ret; + unsigned int reg; + unsigned long rate; + + mhdp = devm_kzalloc(&pdev->dev, sizeof(struct cdns_mhdp_device), + GFP_KERNEL); + if (!mhdp) + return -ENOMEM; + + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "couldn't get clk: %ld\n", PTR_ERR(clk)); + return PTR_ERR(clk); + } + + mhdp->dev = &pdev->dev; + dev_set_drvdata(&pdev->dev, mhdp); + + drm_dp_aux_init(&mhdp->aux); + mhdp->aux.dev = &pdev->dev; + mhdp->aux.transfer = mhdp_transfer; + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mhdp->regs = devm_ioremap_resource(&pdev->dev, regs); + if (IS_ERR(mhdp->regs)) + return PTR_ERR(mhdp->regs); + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 1); + mhdp->dbg_regs = devm_ioremap_resource(&pdev->dev, regs); + if (IS_ERR(mhdp->dbg_regs)) + return PTR_ERR(mhdp->dbg_regs); + + platform_set_drvdata(pdev, mhdp); + + ret = load_firmware(mhdp, IRAM_FW_NAME, CDNS_MHDP_IMEM); + if (ret) + return ret; + + ret = load_firmware(mhdp, DRAM_FW_NAME, CDNS_MHDP_DMEM); + if (ret) + return ret; + + rate = clk_get_rate(clk); + writel(rate % 1000000, mhdp->regs + CDNS_SW_CLK_L); + writel(rate / 1000000, mhdp->regs + CDNS_SW_CLK_H); + + /* Leave debug mode */ + writel(0, mhdp->regs + CDNS_APB_CTRL); + + /* + * Wait for the KEEP_ALIVE "message" on the first 8 bits. + * Updated each sched "tick" (~2ms) + */ + ret = readl_poll_timeout(mhdp->regs + CDNS_KEEP_ALIVE, reg, + reg & CDNS_KEEP_ALIVE_MASK, 500, + CDNS_KEEP_ALIVE_TIMEOUT); + if (ret) { + dev_err(&pdev->dev, + "device didn't give any life sign: reg %d\n", reg); + return -EIO; + } + + /* + * FIXME (CDNS): how are the characteristics/features of the host + * defined? Will they be always hardcoded? + */ + /* FIXME: link rate 2.7; num_lanes = 2, */ + /* FIXME: read capabilities from PHY */ + mhdp->host.link_rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4); + mhdp->host.lanes_cnt = CDNS_LANE_4 | CDNS_SCRAMBLER; + mhdp->host.volt_swing = CDNS_VOLT_SWING(3); + mhdp->host.pre_emphasis = CDNS_PRE_EMPHASIS(2); + mhdp->host.pattern_supp = CDNS_SUPPORT_TPS(1) | + CDNS_SUPPORT_TPS(2) | CDNS_SUPPORT_TPS(3) | + CDNS_SUPPORT_TPS(4); + mhdp->host.fast_link = 0; + mhdp->host.lane_mapping = CDNS_LANE_MAPPING_FLIPPED; + mhdp->host.enhanced = true; + + mhdp->bridge.of_node = pdev->dev.of_node; + mhdp->bridge.funcs = &cdns_mhdp_bridge_funcs; + + /* Init events to 0 as it's not cleared by FW at boot but on read */ + readl(mhdp->regs + CDNS_SW_EVENT0); + readl(mhdp->regs + CDNS_SW_EVENT1); + readl(mhdp->regs + CDNS_SW_EVENT2); + readl(mhdp->regs + CDNS_SW_EVENT3); + + /* Activate uCPU */ + ret = cdns_mhdp_set_firmware_active(mhdp, true); + if (ret) { + dev_err(mhdp->dev, "Failed to activate DP\n"); + return ret; + } + + /* Loop over HDP change */ + /* + * FIXME: does not work when put in mhdp_bridge_enable. + * Where should we put it? + */ + /* Is it still needed with use of mb message HPD STATUS? */ + ret = readl_poll_timeout(mhdp->regs + CDNS_SW_EVENT0, reg, + reg & CDNS_DPTX_HPD, 500, + CDNS_SW_EVENT0_TIMEOUT); + if (ret) { + dev_err(mhdp->dev, "no HPD received %d\n", reg); + return -ENODEV; + } + + drm_bridge_add(&mhdp->bridge); + + return 0; +} + +MODULE_FIRMWARE(IRAM_FW_NAME); +MODULE_FIRMWARE(DRAM_FW_NAME); + +static int mhdp_remove(struct platform_device *pdev) +{ + struct cdns_mhdp_device *mhdp = dev_get_drvdata(&pdev->dev); + int ret; + + drm_bridge_remove(&mhdp->bridge); + + ret = cdns_mhdp_set_firmware_active(mhdp, false); + if (ret) { + dev_err(mhdp->dev, "Failed to de-activate DP\n"); + return ret; + } + + /* FIXME: check for missing functions */ + + return 0; +} + +static struct platform_driver mhdp_driver = { + .driver = { + .name = "cdns-mhdp", + .of_match_table = of_match_ptr(mhdp_ids), + }, + .probe = mhdp_probe, + .remove = mhdp_remove, +}; +module_platform_driver(mhdp_driver); + +MODULE_AUTHOR("Quentin Schulz quentin.schulz@free-electrons.com"); +MODULE_DESCRIPTION("Cadence MHDP DP bridge driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:cdns-mhdp");