// SPDX-License-Identifier: GPL-2.0 /* * Cadence MHDP8546 DP bridge driver. * * Copyright (C) 2020 Cadence Design Systems, Inc. * * Authors: Quentin Schulz <[email protected]> * Swapnil Jakhade <[email protected]> * Yuti Amonkar <[email protected]> * Tomi Valkeinen <[email protected]> * Jyri Sarha <[email protected]> * * TODO: * - Implement optimized mailbox communication using mailbox interrupts * - Add support for power management * - Add support for features like audio, MST and fast link training * - Implement request_fw_cancel to handle HW_STATE * - Fix asynchronous loading of firmware implementation * - Add DRM helper function for cdns_mhdp_lower_link_rate */ #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/irq.h> #include <linux/media-bus-format.h> #include <linux/module.h> #include <linux/of.h> #include <linux/phy/phy.h> #include <linux/phy/phy-dp.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/wait.h> #include <drm/display/drm_dp_helper.h> #include <drm/display/drm_hdcp_helper.h> #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_atomic_state_helper.h> #include <drm/drm_bridge.h> #include <drm/drm_connector.h> #include <drm/drm_edid.h> #include <drm/drm_modeset_helper_vtables.h> #include <drm/drm_print.h> #include <drm/drm_probe_helper.h> #include <asm/unaligned.h> #include "cdns-mhdp8546-core.h" #include "cdns-mhdp8546-hdcp.h" #include "cdns-mhdp8546-j721e.h" static void cdns_mhdp_bridge_hpd_enable(struct drm_bridge *bridge) { … } static void cdns_mhdp_bridge_hpd_disable(struct drm_bridge *bridge) { … } static int cdns_mhdp_mailbox_read(struct cdns_mhdp_device *mhdp) { … } static int cdns_mhdp_mailbox_write(struct cdns_mhdp_device *mhdp, u8 val) { … } static int cdns_mhdp_mailbox_recv_header(struct cdns_mhdp_device *mhdp, u8 module_id, u8 opcode, u16 req_size) { … } static int cdns_mhdp_mailbox_recv_data(struct cdns_mhdp_device *mhdp, u8 *buff, u16 buff_size) { … } static int cdns_mhdp_mailbox_send(struct cdns_mhdp_device *mhdp, u8 module_id, u8 opcode, u16 size, u8 *message) { … } static int cdns_mhdp_reg_read(struct cdns_mhdp_device *mhdp, u32 addr, u32 *value) { … } static int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val) { … } static int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr, u8 start_bit, u8 bits_no, u32 val) { … } static int cdns_mhdp_dpcd_read(struct cdns_mhdp_device *mhdp, u32 addr, u8 *data, u16 len) { … } static int cdns_mhdp_dpcd_write(struct cdns_mhdp_device *mhdp, u32 addr, u8 value) { … } static int cdns_mhdp_set_firmware_active(struct cdns_mhdp_device *mhdp, bool enable) { … } static int cdns_mhdp_get_hpd_status(struct cdns_mhdp_device *mhdp) { … } static int cdns_mhdp_get_edid_block(void *data, u8 *edid, unsigned int block, size_t length) { … } static int cdns_mhdp_read_hpd_event(struct cdns_mhdp_device *mhdp) { … } static int cdns_mhdp_adjust_lt(struct cdns_mhdp_device *mhdp, unsigned int nlanes, unsigned int udelay, const u8 *lanes_data, u8 link_status[DP_LINK_STATUS_SIZE]) { … } /** * cdns_mhdp_link_power_up() - power up a DisplayPort link * @aux: DisplayPort AUX channel * @link: pointer to a structure containing the link configuration * * Returns 0 on success or a negative error code on failure. */ static int cdns_mhdp_link_power_up(struct drm_dp_aux *aux, struct cdns_mhdp_link *link) { … } /** * cdns_mhdp_link_power_down() - power down a DisplayPort link * @aux: DisplayPort AUX channel * @link: pointer to a structure containing the link configuration * * Returns 0 on success or a negative error code on failure. */ static int cdns_mhdp_link_power_down(struct drm_dp_aux *aux, struct cdns_mhdp_link *link) { … } /** * cdns_mhdp_link_configure() - configure a DisplayPort link * @aux: DisplayPort AUX channel * @link: pointer to a structure containing the link configuration * * Returns 0 on success or a negative error code on failure. */ static int cdns_mhdp_link_configure(struct drm_dp_aux *aux, struct cdns_mhdp_link *link) { … } static unsigned int cdns_mhdp_max_link_rate(struct cdns_mhdp_device *mhdp) { … } static u8 cdns_mhdp_max_num_lanes(struct cdns_mhdp_device *mhdp) { … } static u8 cdns_mhdp_eq_training_pattern_supported(struct cdns_mhdp_device *mhdp) { … } static bool cdns_mhdp_get_ssc_supported(struct cdns_mhdp_device *mhdp) { … } static enum drm_connector_status cdns_mhdp_detect(struct cdns_mhdp_device *mhdp) { … } static int cdns_mhdp_check_fw_version(struct cdns_mhdp_device *mhdp) { … } static int cdns_mhdp_fw_activate(const struct firmware *fw, struct cdns_mhdp_device *mhdp) { … } static void cdns_mhdp_fw_cb(const struct firmware *fw, void *context) { … } static int cdns_mhdp_load_firmware(struct cdns_mhdp_device *mhdp) { … } static ssize_t cdns_mhdp_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) { … } static int cdns_mhdp_link_training_init(struct cdns_mhdp_device *mhdp) { … } static void cdns_mhdp_get_adjust_train(struct cdns_mhdp_device *mhdp, u8 link_status[DP_LINK_STATUS_SIZE], u8 lanes_data[CDNS_DP_MAX_NUM_LANES], union phy_configure_opts *phy_cfg) { … } static void cdns_mhdp_set_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE], unsigned int lane, u8 volt) { … } static void cdns_mhdp_set_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE], unsigned int lane, u8 pre_emphasis) { … } static void cdns_mhdp_adjust_requested_eq(struct cdns_mhdp_device *mhdp, u8 link_status[DP_LINK_STATUS_SIZE]) { … } static void cdns_mhdp_print_lt_status(const char *prefix, struct cdns_mhdp_device *mhdp, union phy_configure_opts *phy_cfg) { … } static bool cdns_mhdp_link_training_channel_eq(struct cdns_mhdp_device *mhdp, u8 eq_tps, unsigned int training_interval) { … } static void cdns_mhdp_adjust_requested_cr(struct cdns_mhdp_device *mhdp, u8 link_status[DP_LINK_STATUS_SIZE], u8 *req_volt, u8 *req_pre) { … } static void cdns_mhdp_validate_cr(struct cdns_mhdp_device *mhdp, bool *cr_done, bool *same_before_adjust, bool *max_swing_reached, u8 before_cr[CDNS_DP_MAX_NUM_LANES], u8 after_cr[DP_LINK_STATUS_SIZE], u8 *req_volt, u8 *req_pre) { … } static bool cdns_mhdp_link_training_cr(struct cdns_mhdp_device *mhdp) { … } static void cdns_mhdp_lower_link_rate(struct cdns_mhdp_link *link) { … } static int cdns_mhdp_link_training(struct cdns_mhdp_device *mhdp, unsigned int training_interval) { … } static u32 cdns_mhdp_get_training_interval_us(struct cdns_mhdp_device *mhdp, u32 interval) { … } static void cdns_mhdp_fill_host_caps(struct cdns_mhdp_device *mhdp) { … } static void cdns_mhdp_fill_sink_caps(struct cdns_mhdp_device *mhdp, u8 dpcd[DP_RECEIVER_CAP_SIZE]) { … } static int cdns_mhdp_link_up(struct cdns_mhdp_device *mhdp) { … } static void cdns_mhdp_link_down(struct cdns_mhdp_device *mhdp) { … } static const struct drm_edid *cdns_mhdp_edid_read(struct cdns_mhdp_device *mhdp, struct drm_connector *connector) { … } static int cdns_mhdp_get_modes(struct drm_connector *connector) { … } static int cdns_mhdp_connector_detect(struct drm_connector *conn, struct drm_modeset_acquire_ctx *ctx, bool force) { … } static u32 cdns_mhdp_get_bpp(struct cdns_mhdp_display_fmt *fmt) { … } static bool cdns_mhdp_bandwidth_ok(struct cdns_mhdp_device *mhdp, const struct drm_display_mode *mode, unsigned int lanes, unsigned int rate) { … } static enum drm_mode_status cdns_mhdp_mode_valid(struct drm_connector *conn, struct drm_display_mode *mode) { … } static int cdns_mhdp_connector_atomic_check(struct drm_connector *conn, struct drm_atomic_state *state) { … } static const struct drm_connector_helper_funcs cdns_mhdp_conn_helper_funcs = …; static const struct drm_connector_funcs cdns_mhdp_conn_funcs = …; static int cdns_mhdp_connector_init(struct cdns_mhdp_device *mhdp) { … } static int cdns_mhdp_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags) { … } static void cdns_mhdp_configure_video(struct cdns_mhdp_device *mhdp, const struct drm_display_mode *mode) { … } static void cdns_mhdp_sst_enable(struct cdns_mhdp_device *mhdp, const struct drm_display_mode *mode) { … } static void cdns_mhdp_atomic_enable(struct drm_bridge *bridge, struct drm_bridge_state *bridge_state) { … } static void cdns_mhdp_atomic_disable(struct drm_bridge *bridge, struct drm_bridge_state *bridge_state) { … } static void cdns_mhdp_detach(struct drm_bridge *bridge) { … } static struct drm_bridge_state * cdns_mhdp_bridge_atomic_duplicate_state(struct drm_bridge *bridge) { … } static void cdns_mhdp_bridge_atomic_destroy_state(struct drm_bridge *bridge, struct drm_bridge_state *state) { … } static struct drm_bridge_state * cdns_mhdp_bridge_atomic_reset(struct drm_bridge *bridge) { … } static u32 *cdns_mhdp_get_input_bus_fmts(struct drm_bridge *bridge, struct drm_bridge_state *bridge_state, struct drm_crtc_state *crtc_state, struct drm_connector_state *conn_state, u32 output_fmt, unsigned int *num_input_fmts) { … } static int cdns_mhdp_atomic_check(struct drm_bridge *bridge, struct drm_bridge_state *bridge_state, struct drm_crtc_state *crtc_state, struct drm_connector_state *conn_state) { … } static enum drm_connector_status cdns_mhdp_bridge_detect(struct drm_bridge *bridge) { … } static const struct drm_edid *cdns_mhdp_bridge_edid_read(struct drm_bridge *bridge, struct drm_connector *connector) { … } static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = …; static bool cdns_mhdp_detect_hpd(struct cdns_mhdp_device *mhdp, bool *hpd_pulse) { … } static int cdns_mhdp_update_link_status(struct cdns_mhdp_device *mhdp) { … } static void cdns_mhdp_modeset_retry_fn(struct work_struct *work) { … } static irqreturn_t cdns_mhdp_irq_handler(int irq, void *data) { … } u32 cdns_mhdp_wait_for_sw_event(struct cdns_mhdp_device *mhdp, u32 event) { … } static void cdns_mhdp_hpd_work(struct work_struct *work) { … } static int cdns_mhdp_probe(struct platform_device *pdev) { … } static void cdns_mhdp_remove(struct platform_device *pdev) { … } static const struct of_device_id mhdp_ids[] = …; MODULE_DEVICE_TABLE(of, mhdp_ids); static struct platform_driver mhdp_driver = …; module_platform_driver(…) …; MODULE_FIRMWARE(…); MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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