This patch enable HDCP in MHDP driver.

Signed-off-by: Parshuram Thombare pthombar@cadence.com Reviewed-by: Robert Foss robert.foss@linaro.org --- drivers/gpu/drm/bridge/cadence/Makefile | 2 +- .../drm/bridge/cadence/cdns-mhdp8546-core.c | 113 +++- .../drm/bridge/cadence/cdns-mhdp8546-core.h | 21 + .../drm/bridge/cadence/cdns-mhdp8546-hdcp.c | 570 ++++++++++++++++++ .../drm/bridge/cadence/cdns-mhdp8546-hdcp.h | 89 +++ 5 files changed, 782 insertions(+), 13 deletions(-) create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-hdcp.c create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-hdcp.h

diff --git a/drivers/gpu/drm/bridge/cadence/Makefile b/drivers/gpu/drm/bridge/cadence/Makefile index 8f647991b374..4d2db8df1bc6 100644 --- a/drivers/gpu/drm/bridge/cadence/Makefile +++ b/drivers/gpu/drm/bridge/cadence/Makefile @@ -1,4 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_DRM_CDNS_MHDP8546) += cdns-mhdp8546.o -cdns-mhdp8546-y := cdns-mhdp8546-core.o +cdns-mhdp8546-y := cdns-mhdp8546-core.o cdns-mhdp8546-hdcp.o cdns-mhdp8546-$(CONFIG_DRM_CDNS_MHDP8546_J721E) += cdns-mhdp8546-j721e.o diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c index d0c65610ebb5..d7e0e6a547b5 100644 --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c @@ -42,6 +42,7 @@ #include <drm/drm_connector.h> #include <drm/drm_crtc_helper.h> #include <drm/drm_dp_helper.h> +#include <drm/drm_hdcp.h> #include <drm/drm_modeset_helper_vtables.h> #include <drm/drm_print.h> #include <drm/drm_probe_helper.h> @@ -49,7 +50,7 @@ #include <asm/unaligned.h>

#include "cdns-mhdp8546-core.h" - +#include "cdns-mhdp8546-hdcp.h" #include "cdns-mhdp8546-j721e.h"

static int cdns_mhdp_mailbox_read(struct cdns_mhdp_device *mhdp) @@ -1614,10 +1615,47 @@ enum drm_mode_status cdns_mhdp_mode_valid(struct drm_connector *conn, return MODE_OK; }

+static int cdns_mhdp_connector_atomic_check(struct drm_connector *conn, + struct drm_atomic_state *state) +{ + struct drm_connector_state *old_state, *new_state; + struct drm_crtc_state *crtc_state; + u64 old_cp, new_cp; + + old_state = drm_atomic_get_old_connector_state(state, conn); + new_state = drm_atomic_get_new_connector_state(state, conn); + old_cp = old_state->content_protection; + new_cp = new_state->content_protection; + + if (old_state->hdcp_content_type != new_state->hdcp_content_type && + new_cp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) { + new_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED; + goto mode_changed; + } + + if (!new_state->crtc) { + if (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED) + new_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED; + return 0; + } + + if (old_cp == new_cp || + (old_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED && + new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)) + return 0; + +mode_changed: + crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc); + crtc_state->mode_changed = true; + + return 0; +} + static const struct drm_connector_helper_funcs cdns_mhdp_conn_helper_funcs = { .detect_ctx = cdns_mhdp_connector_detect, .get_modes = cdns_mhdp_get_modes, .mode_valid = cdns_mhdp_mode_valid, + .atomic_check = cdns_mhdp_connector_atomic_check, };

static const struct drm_connector_funcs cdns_mhdp_conn_funcs = { @@ -1662,7 +1700,7 @@ static int cdns_mhdp_connector_init(struct cdns_mhdp_device *mhdp) return ret; }

- return 0; + return drm_connector_attach_content_protection_property(conn, true); }

static int cdns_mhdp_attach(struct drm_bridge *bridge, @@ -1957,6 +1995,14 @@ static void cdns_mhdp_atomic_enable(struct drm_bridge *bridge, if (WARN_ON(!conn_state)) goto out;

+ if (mhdp->hw_state == MHDP_HW_READY && + conn_state->content_protection == + DRM_MODE_CONTENT_PROTECTION_DESIRED) { + mutex_unlock(&mhdp->link_mutex); + cdns_mhdp_hdcp_enable(mhdp, conn_state->hdcp_content_type); + mutex_lock(&mhdp->link_mutex); + } + crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc); if (WARN_ON(!crtc_state)) goto out; @@ -2000,6 +2046,7 @@ static void cdns_mhdp_atomic_disable(struct drm_bridge *bridge,

mutex_lock(&mhdp->link_mutex);

+ cdns_mhdp_hdcp_disable(mhdp); mhdp->bridge_enabled = false; cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &resp); resp &= ~CDNS_DP_FRAMER_EN; @@ -2288,7 +2335,6 @@ static irqreturn_t cdns_mhdp_irq_handler(int irq, void *data) struct cdns_mhdp_device *mhdp = data; u32 apb_stat, sw_ev0; bool bridge_attached; - int ret;

apb_stat = readl(mhdp->regs + CDNS_APB_INT_STATUS); if (!(apb_stat & CDNS_APB_INT_MASK_SW_EVENT_INT)) @@ -2307,20 +2353,54 @@ static irqreturn_t cdns_mhdp_irq_handler(int irq, void *data) spin_unlock(&mhdp->start_lock);

if (bridge_attached && (sw_ev0 & CDNS_DPTX_HPD)) { - ret = cdns_mhdp_update_link_status(mhdp); - if (mhdp->connector.dev) { - if (ret < 0) - schedule_work(&mhdp->modeset_retry_work); - else - drm_kms_helper_hotplug_event(mhdp->bridge.dev); - } else { - drm_bridge_hpd_notify(&mhdp->bridge, cdns_mhdp_detect(mhdp)); - } + schedule_work(&mhdp->hpd_work); + } + + if (sw_ev0 & ~CDNS_DPTX_HPD) { + mhdp->sw_events |= (sw_ev0 & ~CDNS_DPTX_HPD); + wake_up(&mhdp->sw_events_wq); }

return IRQ_HANDLED; }

+u32 cdns_mhdp_wait_for_sw_event(struct cdns_mhdp_device *mhdp, u32 event) +{ + u32 ret; + + ret = wait_event_timeout(mhdp->sw_events_wq, + mhdp->sw_events & event, + msecs_to_jiffies(500)); + if (!ret) { + dev_dbg(mhdp->dev, "SW event 0x%x timeout\n", event); + goto sw_event_out; + } + + ret = mhdp->sw_events; + mhdp->sw_events &= ~event; + +sw_event_out: + return ret; +} + +static void cdns_mhdp_hpd_work(struct work_struct *work) +{ + struct cdns_mhdp_device *mhdp = container_of(work, + struct cdns_mhdp_device, + hpd_work); + int ret; + + ret = cdns_mhdp_update_link_status(mhdp); + if (mhdp->connector.dev) { + if (ret < 0) + schedule_work(&mhdp->modeset_retry_work); + else + drm_kms_helper_hotplug_event(mhdp->bridge.dev); + } else { + drm_bridge_hpd_notify(&mhdp->bridge, cdns_mhdp_detect(mhdp)); + } +} + static int cdns_mhdp_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -2356,6 +2436,12 @@ static int cdns_mhdp_probe(struct platform_device *pdev) return PTR_ERR(mhdp->regs); }

+ mhdp->sapb_regs = devm_platform_ioremap_resource_byname(pdev, "mhdptx-sapb"); + if (IS_ERR(mhdp->sapb_regs)) { + dev_err(dev, "Failed to get SAPB memory resource\n"); + return PTR_ERR(mhdp->sapb_regs); + } + mhdp->phy = devm_of_phy_get_by_index(dev, pdev->dev.of_node, 0); if (IS_ERR(mhdp->phy)) { dev_err(dev, "no PHY configured\n"); @@ -2430,13 +2516,16 @@ static int cdns_mhdp_probe(struct platform_device *pdev)

/* Initialize the work for modeset in case of link train failure */ INIT_WORK(&mhdp->modeset_retry_work, cdns_mhdp_modeset_retry_fn); + INIT_WORK(&mhdp->hpd_work, cdns_mhdp_hpd_work);

init_waitqueue_head(&mhdp->fw_load_wq); + init_waitqueue_head(&mhdp->sw_events_wq);

ret = cdns_mhdp_load_firmware(mhdp); if (ret) goto phy_exit;

+ cdns_mhdp_hdcp_init(mhdp); drm_bridge_add(&mhdp->bridge);

return 0; diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h index 5897a85e3159..8744f4f70649 100644 --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h @@ -47,6 +47,10 @@ struct phy;

#define CDNS_SW_EVENT0 0x00044 #define CDNS_DPTX_HPD BIT(0) +#define CDNS_HDCP_TX_STATUS BIT(4) +#define CDNS_HDCP2_TX_IS_KM_STORED BIT(5) +#define CDNS_HDCP2_TX_STORE_KM BIT(6) +#define CDNS_HDCP_TX_IS_RCVR_ID_VALID BIT(7)

#define CDNS_SW_EVENT1 0x00048 #define CDNS_SW_EVENT2 0x0004c @@ -339,8 +343,17 @@ struct cdns_mhdp_platform_info { #define to_cdns_mhdp_bridge_state(s) \ container_of(s, struct cdns_mhdp_bridge_state, base)

+struct cdns_mhdp_hdcp { + struct delayed_work check_work; + struct work_struct prop_work; + struct mutex mutex; /* mutex to protect hdcp.value */ + u32 value; + u8 hdcp_content_type; +}; + struct cdns_mhdp_device { void __iomem *regs; + void __iomem *sapb_regs; void __iomem *j721e_regs;

struct device *dev; @@ -392,9 +405,17 @@ struct cdns_mhdp_device {

/* Work struct to schedule a uevent on link train failure */ struct work_struct modeset_retry_work; + struct work_struct hpd_work; + + wait_queue_head_t sw_events_wq; + u32 sw_events; + + struct cdns_mhdp_hdcp hdcp; };

#define connector_to_mhdp(x) container_of(x, struct cdns_mhdp_device, connector) #define bridge_to_mhdp(x) container_of(x, struct cdns_mhdp_device, bridge)

+u32 cdns_mhdp_wait_for_sw_event(struct cdns_mhdp_device *mhdp, uint32_t event); + #endif diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-hdcp.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-hdcp.c new file mode 100644 index 000000000000..c4bcacd23ee3 --- /dev/null +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-hdcp.c @@ -0,0 +1,570 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Cadence MHDP8546 DP bridge driver. + * + * Copyright (C) 2020 Cadence Design Systems, Inc. + * + */ + +#include <linux/io.h> +#include <linux/iopoll.h> + +#include <asm/unaligned.h> + +#include <drm/drm_hdcp.h> + +#include "cdns-mhdp8546-hdcp.h" + +static int cdns_mhdp_secure_mailbox_read(struct cdns_mhdp_device *mhdp) +{ + int ret, empty; + + WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex)); + + ret = readx_poll_timeout(readl, mhdp->sapb_regs + CDNS_MAILBOX_EMPTY, + empty, !empty, MAILBOX_RETRY_US, + MAILBOX_TIMEOUT_US); + if (ret < 0) + return ret; + + return readl(mhdp->sapb_regs + CDNS_MAILBOX_RX_DATA) & 0xff; +} + +static int cdns_mhdp_secure_mailbox_write(struct cdns_mhdp_device *mhdp, + u8 val) +{ + int ret, full; + + WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex)); + + ret = readx_poll_timeout(readl, mhdp->sapb_regs + CDNS_MAILBOX_FULL, + full, !full, MAILBOX_RETRY_US, + MAILBOX_TIMEOUT_US); + if (ret < 0) + return ret; + + writel(val, mhdp->sapb_regs + CDNS_MAILBOX_TX_DATA); + + return 0; +} + +static int cdns_mhdp_secure_mailbox_recv_header(struct cdns_mhdp_device *mhdp, + u8 module_id, + u8 opcode, + u16 req_size) +{ + u32 mbox_size, i; + u8 header[4]; + int ret; + + /* read the header of the message */ + for (i = 0; i < sizeof(header); i++) { + ret = cdns_mhdp_secure_mailbox_read(mhdp); + if (ret < 0) + return ret; + + header[i] = ret; + } + + mbox_size = get_unaligned_be16(header + 2); + + if (opcode != header[0] || module_id != header[1] || + (opcode != HDCP_TRAN_IS_REC_ID_VALID && req_size != mbox_size)) { + for (i = 0; i < mbox_size; i++) + if (cdns_mhdp_secure_mailbox_read(mhdp) < 0) + break; + return -EINVAL; + } + + return 0; +} + +static int cdns_mhdp_secure_mailbox_recv_data(struct cdns_mhdp_device *mhdp, + u8 *buff, u16 buff_size) +{ + int ret; + u32 i; + + for (i = 0; i < buff_size; i++) { + ret = cdns_mhdp_secure_mailbox_read(mhdp); + if (ret < 0) + return ret; + + buff[i] = ret; + } + + return 0; +} + +static int cdns_mhdp_secure_mailbox_send(struct cdns_mhdp_device *mhdp, + u8 module_id, + u8 opcode, + u16 size, + u8 *message) +{ + u8 header[4]; + int ret; + u32 i; + + header[0] = opcode; + header[1] = module_id; + put_unaligned_be16(size, header + 2); + + for (i = 0; i < sizeof(header); i++) { + ret = cdns_mhdp_secure_mailbox_write(mhdp, header[i]); + if (ret) + return ret; + } + + for (i = 0; i < size; i++) { + ret = cdns_mhdp_secure_mailbox_write(mhdp, message[i]); + if (ret) + return ret; + } + + return 0; +} + +static int cdns_mhdp_hdcp_get_status(struct cdns_mhdp_device *mhdp, + u16 *hdcp_port_status) +{ + u8 hdcp_status[HDCP_STATUS_SIZE]; + int ret; + + mutex_lock(&mhdp->mbox_mutex); + ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX, + HDCP_TRAN_STATUS_CHANGE, 0, NULL); + if (ret) + goto err_get_hdcp_status; + + ret = cdns_mhdp_secure_mailbox_recv_header(mhdp, MB_MODULE_ID_HDCP_TX, + HDCP_TRAN_STATUS_CHANGE, + sizeof(hdcp_status)); + if (ret) + goto err_get_hdcp_status; + + ret = cdns_mhdp_secure_mailbox_recv_data(mhdp, hdcp_status, + sizeof(hdcp_status)); + if (ret) + goto err_get_hdcp_status; + + *hdcp_port_status = ((u16)(hdcp_status[0] << 8) | hdcp_status[1]); + +err_get_hdcp_status: + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +static u8 cdns_mhdp_hdcp_handle_status(struct cdns_mhdp_device *mhdp, + u16 status) +{ + u8 err = GET_HDCP_PORT_STS_LAST_ERR(status); + + if (err) + dev_dbg(mhdp->dev, "HDCP Error = %d", err); + + return err; +} + +static int cdns_mhdp_hdcp_rx_id_valid_response(struct cdns_mhdp_device *mhdp, + u8 valid) +{ + int ret; + + mutex_lock(&mhdp->mbox_mutex); + ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX, + HDCP_TRAN_RESPOND_RECEIVER_ID_VALID, + 1, &valid); + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +static int cdns_mhdp_hdcp_rx_id_valid(struct cdns_mhdp_device *mhdp, + u8 *recv_num, u8 *hdcp_rx_id) +{ + u8 rec_id_hdr[2]; + u8 status; + int ret; + + mutex_lock(&mhdp->mbox_mutex); + ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX, + HDCP_TRAN_IS_REC_ID_VALID, 0, NULL); + if (ret) + goto err_rx_id_valid; + + ret = cdns_mhdp_secure_mailbox_recv_header(mhdp, MB_MODULE_ID_HDCP_TX, + HDCP_TRAN_IS_REC_ID_VALID, + sizeof(status)); + if (ret) + goto err_rx_id_valid; + + ret = cdns_mhdp_secure_mailbox_recv_data(mhdp, rec_id_hdr, 2); + if (ret) + goto err_rx_id_valid; + + *recv_num = rec_id_hdr[0]; + + ret = cdns_mhdp_secure_mailbox_recv_data(mhdp, hdcp_rx_id, 5 * *recv_num); + +err_rx_id_valid: + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +static int cdns_mhdp_hdcp_km_stored_resp(struct cdns_mhdp_device *mhdp, + u32 size, u8 *km) +{ + int ret; + + mutex_lock(&mhdp->mbox_mutex); + ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX, + HDCP2X_TX_RESPOND_KM, size, km); + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +static int cdns_mhdp_hdcp_tx_is_km_stored(struct cdns_mhdp_device *mhdp, + u8 *resp, u32 size) +{ + int ret; + + mutex_lock(&mhdp->mbox_mutex); + ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX, + HDCP2X_TX_IS_KM_STORED, 0, NULL); + if (ret) + goto err_is_km_stored; + + ret = cdns_mhdp_secure_mailbox_recv_header(mhdp, MB_MODULE_ID_HDCP_TX, + HDCP2X_TX_IS_KM_STORED, + size); + if (ret) + goto err_is_km_stored; + + ret = cdns_mhdp_secure_mailbox_recv_data(mhdp, resp, size); +err_is_km_stored: + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +static int cdns_mhdp_hdcp_tx_config(struct cdns_mhdp_device *mhdp, + u8 hdcp_cfg) +{ + int ret; + + mutex_lock(&mhdp->mbox_mutex); + ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX, + HDCP_TRAN_CONFIGURATION, 1, &hdcp_cfg); + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +static int cdns_mhdp_hdcp_set_config(struct cdns_mhdp_device *mhdp, + u8 hdcp_config, bool enable) +{ + u16 hdcp_port_status; + u32 ret_event; + u8 hdcp_cfg; + int ret; + + hdcp_cfg = hdcp_config | (enable ? 0x04 : 0) | + (HDCP_CONTENT_TYPE_0 << 3); + cdns_mhdp_hdcp_tx_config(mhdp, hdcp_cfg); + ret_event = cdns_mhdp_wait_for_sw_event(mhdp, CDNS_HDCP_TX_STATUS); + if (!ret_event) + return -1; + + ret = cdns_mhdp_hdcp_get_status(mhdp, &hdcp_port_status); + if (ret || cdns_mhdp_hdcp_handle_status(mhdp, hdcp_port_status)) + return -1; + + return 0; +} + +static int cdns_mhdp_hdcp_auth_check(struct cdns_mhdp_device *mhdp) +{ + u16 hdcp_port_status; + u32 ret_event; + int ret; + + ret_event = cdns_mhdp_wait_for_sw_event(mhdp, CDNS_HDCP_TX_STATUS); + if (!ret_event) + return -1; + + ret = cdns_mhdp_hdcp_get_status(mhdp, &hdcp_port_status); + if (ret || cdns_mhdp_hdcp_handle_status(mhdp, hdcp_port_status)) + return -1; + + if (hdcp_port_status & 1) { + dev_dbg(mhdp->dev, "Authentication completed successfully!\n"); + return 0; + } + + dev_dbg(mhdp->dev, "Authentication failed\n"); + + return -1; +} + +static int cdns_mhdp_hdcp_check_receviers(struct cdns_mhdp_device *mhdp) +{ + u8 hdcp_rec_id[HDCP_MAX_RECEIVERS][HDCP_RECEIVER_ID_SIZE_BYTES]; + u8 hdcp_num_rec; + u32 ret_event; + + ret_event = cdns_mhdp_wait_for_sw_event(mhdp, + CDNS_HDCP_TX_IS_RCVR_ID_VALID); + if (!ret_event) + return -1; + + hdcp_num_rec = 0; + memset(&hdcp_rec_id, 0, sizeof(hdcp_rec_id)); + cdns_mhdp_hdcp_rx_id_valid(mhdp, &hdcp_num_rec, (u8 *)hdcp_rec_id); + cdns_mhdp_hdcp_rx_id_valid_response(mhdp, 1); + + return 0; +} + +static int cdns_mhdp_hdcp_auth_22(struct cdns_mhdp_device *mhdp) +{ + u8 resp[HDCP_STATUS_SIZE]; + u16 hdcp_port_status; + u32 ret_event; + int ret; + + dev_dbg(mhdp->dev, "HDCP: Start 2.2 Authentication\n"); + ret_event = cdns_mhdp_wait_for_sw_event(mhdp, + CDNS_HDCP2_TX_IS_KM_STORED); + if (!ret_event) + return -1; + + if (ret_event & CDNS_HDCP_TX_STATUS) { + mhdp->sw_events &= ~CDNS_HDCP_TX_STATUS; + ret = cdns_mhdp_hdcp_get_status(mhdp, &hdcp_port_status); + if (ret || cdns_mhdp_hdcp_handle_status(mhdp, hdcp_port_status)) + return -1; + } + + cdns_mhdp_hdcp_tx_is_km_stored(mhdp, resp, sizeof(resp)); + cdns_mhdp_hdcp_km_stored_resp(mhdp, 0, NULL); + + if (cdns_mhdp_hdcp_check_receviers(mhdp)) + return -1; + + return 0; +} + +static inline int cdns_mhdp_hdcp_auth_14(struct cdns_mhdp_device *mhdp) +{ + dev_dbg(mhdp->dev, "HDCP: Starting 1.4 Authentication\n"); + return cdns_mhdp_hdcp_check_receviers(mhdp); +} + +static int cdns_mhdp_hdcp_auth(struct cdns_mhdp_device *mhdp, + u8 hdcp_config) +{ + int ret; + + ret = cdns_mhdp_hdcp_set_config(mhdp, hdcp_config, true); + if (ret) + goto auth_failed; + + if (hdcp_config == HDCP_TX_1) + ret = cdns_mhdp_hdcp_auth_14(mhdp); + else + ret = cdns_mhdp_hdcp_auth_22(mhdp); + + if (ret) + goto auth_failed; + + ret = cdns_mhdp_hdcp_auth_check(mhdp); + if (ret) + ret = cdns_mhdp_hdcp_auth_check(mhdp); + +auth_failed: + return ret; +} + +static int _cdns_mhdp_hdcp_disable(struct cdns_mhdp_device *mhdp) +{ + int ret; + + dev_dbg(mhdp->dev, "[%s:%d] HDCP is being disabled...\n", + mhdp->connector.name, mhdp->connector.base.id); + + ret = cdns_mhdp_hdcp_set_config(mhdp, 0, false); + + return ret; +} + +static int _cdns_mhdp_hdcp_enable(struct cdns_mhdp_device *mhdp, u8 content_type) +{ + int ret, tries = 3; + u32 i; + + for (i = 0; i < tries; i++) { + if (content_type == DRM_MODE_HDCP_CONTENT_TYPE0 || + content_type == DRM_MODE_HDCP_CONTENT_TYPE1) { + ret = cdns_mhdp_hdcp_auth(mhdp, HDCP_TX_2); + if (!ret) + return 0; + _cdns_mhdp_hdcp_disable(mhdp); + } + + if (content_type == DRM_MODE_HDCP_CONTENT_TYPE0) { + ret = cdns_mhdp_hdcp_auth(mhdp, HDCP_TX_1); + if (!ret) + return 0; + _cdns_mhdp_hdcp_disable(mhdp); + } + } + + dev_err(mhdp->dev, "HDCP authentication failed (%d tries/%d)\n", + tries, ret); + + return ret; +} + +static int cdns_mhdp_hdcp_check_link(struct cdns_mhdp_device *mhdp) +{ + u16 hdcp_port_status; + int ret = 0; + + mutex_lock(&mhdp->hdcp.mutex); + if (mhdp->hdcp.value == DRM_MODE_CONTENT_PROTECTION_UNDESIRED) + goto out; + + ret = cdns_mhdp_hdcp_get_status(mhdp, &hdcp_port_status); + if (!ret && hdcp_port_status & HDCP_PORT_STS_AUTH) + goto out; + + dev_err(mhdp->dev, + "[%s:%d] HDCP link failed, retrying authentication\n", + mhdp->connector.name, mhdp->connector.base.id); + + ret = _cdns_mhdp_hdcp_disable(mhdp); + if (ret) { + mhdp->hdcp.value = DRM_MODE_CONTENT_PROTECTION_DESIRED; + schedule_work(&mhdp->hdcp.prop_work); + goto out; + } + + ret = _cdns_mhdp_hdcp_enable(mhdp, mhdp->hdcp.hdcp_content_type); + if (ret) { + mhdp->hdcp.value = DRM_MODE_CONTENT_PROTECTION_DESIRED; + schedule_work(&mhdp->hdcp.prop_work); + } +out: + mutex_unlock(&mhdp->hdcp.mutex); + return ret; +} + +static void cdns_mhdp_hdcp_check_work(struct work_struct *work) +{ + struct delayed_work *d_work = to_delayed_work(work); + struct cdns_mhdp_hdcp *hdcp = container_of(d_work, + struct cdns_mhdp_hdcp, + check_work); + struct cdns_mhdp_device *mhdp = container_of(hdcp, + struct cdns_mhdp_device, + hdcp); + + if (!cdns_mhdp_hdcp_check_link(mhdp)) + schedule_delayed_work(&hdcp->check_work, + DRM_HDCP_CHECK_PERIOD_MS); +} + +static void cdns_mhdp_hdcp_prop_work(struct work_struct *work) +{ + struct cdns_mhdp_hdcp *hdcp = container_of(work, + struct cdns_mhdp_hdcp, + prop_work); + struct cdns_mhdp_device *mhdp = container_of(hdcp, + struct cdns_mhdp_device, + hdcp); + struct drm_device *dev = mhdp->connector.dev; + struct drm_connector_state *state; + + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); + mutex_lock(&mhdp->hdcp.mutex); + if (mhdp->hdcp.value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) { + state = mhdp->connector.state; + state->content_protection = mhdp->hdcp.value; + } + mutex_unlock(&mhdp->hdcp.mutex); + drm_modeset_unlock(&dev->mode_config.connection_mutex); +} + +int cdns_mhdp_hdcp_set_lc(struct cdns_mhdp_device *mhdp, u8 *val) +{ + int ret; + + mutex_lock(&mhdp->mbox_mutex); + ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_GENERAL, + HDCP_GENERAL_SET_LC_128, + 16, val); + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +int +cdns_mhdp_hdcp_set_public_key_params(struct cdns_mhdp_device *mhdp, + struct cdns_hdcp_tx_public_key_param *val) +{ + int ret; + + mutex_lock(&mhdp->mbox_mutex); + ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX, + HDCP2X_TX_SET_PUBLIC_KEY_PARAMS, + sizeof(*val), (u8 *)val); + mutex_unlock(&mhdp->mbox_mutex); + + return ret; +} + +int cdns_mhdp_hdcp_enable(struct cdns_mhdp_device *mhdp, u8 content_type) +{ + int ret; + + mutex_lock(&mhdp->hdcp.mutex); + ret = _cdns_mhdp_hdcp_enable(mhdp, content_type); + if (ret) + goto out; + + mhdp->hdcp.hdcp_content_type = content_type; + mhdp->hdcp.value = DRM_MODE_CONTENT_PROTECTION_ENABLED; + schedule_work(&mhdp->hdcp.prop_work); + schedule_delayed_work(&mhdp->hdcp.check_work, + DRM_HDCP_CHECK_PERIOD_MS); +out: + mutex_unlock(&mhdp->hdcp.mutex); + return ret; +} + +int cdns_mhdp_hdcp_disable(struct cdns_mhdp_device *mhdp) +{ + int ret = 0; + + mutex_lock(&mhdp->hdcp.mutex); + if (mhdp->hdcp.value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) { + mhdp->hdcp.value = DRM_MODE_CONTENT_PROTECTION_UNDESIRED; + schedule_work(&mhdp->hdcp.prop_work); + ret = _cdns_mhdp_hdcp_disable(mhdp); + } + mutex_unlock(&mhdp->hdcp.mutex); + cancel_delayed_work_sync(&mhdp->hdcp.check_work); + + return ret; +} + +void cdns_mhdp_hdcp_init(struct cdns_mhdp_device *mhdp) +{ + INIT_DELAYED_WORK(&mhdp->hdcp.check_work, cdns_mhdp_hdcp_check_work); + INIT_WORK(&mhdp->hdcp.prop_work, cdns_mhdp_hdcp_prop_work); + mutex_init(&mhdp->hdcp.mutex); +} diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-hdcp.h b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-hdcp.h new file mode 100644 index 000000000000..3b6ec9c3a8d8 --- /dev/null +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-hdcp.h @@ -0,0 +1,89 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Cadence MHDP8546 DP bridge driver. + * + * Copyright (C) 2020 Cadence Design Systems, Inc. + * + */ + +#ifndef CDNS_MHDP8546_HDCP_H +#define CDNS_MHDP8546_HDCP_H + +#include "cdns-mhdp8546-core.h" + +#define HDCP_MAX_RECEIVERS 32 +#define HDCP_RECEIVER_ID_SIZE_BYTES 5 +#define HDCP_STATUS_SIZE 0x5 +#define HDCP_PORT_STS_AUTH 0x1 +#define HDCP_PORT_STS_LAST_ERR_SHIFT 0x5 +#define HDCP_PORT_STS_LAST_ERR_MASK (0x0F << 5) +#define GET_HDCP_PORT_STS_LAST_ERR(__sts__) \ + (((__sts__) & HDCP_PORT_STS_LAST_ERR_MASK) >> \ + HDCP_PORT_STS_LAST_ERR_SHIFT) + +#define HDCP_CONFIG_1_4 BIT(0) /* use HDCP 1.4 only */ +#define HDCP_CONFIG_2_2 BIT(1) /* use HDCP 2.2 only */ +/* use All HDCP versions */ +#define HDCP_CONFIG_ALL (BIT(0) | BIT(1)) +#define HDCP_CONFIG_NONE 0 + +enum { + HDCP_GENERAL_SET_LC_128, + HDCP_SET_SEED, +}; + +enum { + HDCP_TRAN_CONFIGURATION, + HDCP2X_TX_SET_PUBLIC_KEY_PARAMS, + HDCP2X_TX_SET_DEBUG_RANDOM_NUMBERS, + HDCP2X_TX_RESPOND_KM, + HDCP1_TX_SEND_KEYS, + HDCP1_TX_SEND_RANDOM_AN, + HDCP_TRAN_STATUS_CHANGE, + HDCP2X_TX_IS_KM_STORED, + HDCP2X_TX_STORE_KM, + HDCP_TRAN_IS_REC_ID_VALID, + HDCP_TRAN_RESPOND_RECEIVER_ID_VALID, + HDCP_TRAN_TEST_KEYS, + HDCP2X_TX_SET_KM_KEY_PARAMS, + HDCP_NUM_OF_SUPPORTED_MESSAGES +}; + +enum { + HDCP_CONTENT_TYPE_0, + HDCP_CONTENT_TYPE_1, +}; + +#define DRM_HDCP_CHECK_PERIOD_MS (128 * 16) + +#define HDCP_PAIRING_R_ID 5 +#define HDCP_PAIRING_M_LEN 16 +#define HDCP_KM_LEN 16 +#define HDCP_PAIRING_M_EKH 16 + +struct cdns_hdcp_pairing_data { + u8 receiver_id[HDCP_PAIRING_R_ID]; + u8 m[HDCP_PAIRING_M_LEN]; + u8 km[HDCP_KM_LEN]; + u8 ekh[HDCP_PAIRING_M_EKH]; +}; + +enum { + HDCP_TX_2, + HDCP_TX_1, + HDCP_TX_BOTH, +}; + +#define DLP_MODULUS_N 384 +#define DLP_E 3 + +struct cdns_hdcp_tx_public_key_param { + u8 N[DLP_MODULUS_N]; + u8 E[DLP_E]; +}; + +int cdns_mhdp_hdcp_enable(struct cdns_mhdp_device *mhdp, u8 content_type); +int cdns_mhdp_hdcp_disable(struct cdns_mhdp_device *mhdp); +void cdns_mhdp_hdcp_init(struct cdns_mhdp_device *mhdp); + +#endif