* [PATCH v6 2/2] drm: bridge: cdns-mhdp8546: Enable HDCP
2021-04-10 18:14 [PATCH v6 0/2] enable HDCP in Cadence MHDP bridge driver Parshuram Thombare
2021-04-10 18:15 ` [PATCH v6 1/2] dt-bindings: drm/bridge: MHDP8546 bridge binding changes for HDCP Parshuram Thombare
@ 2021-04-10 18:15 ` Parshuram Thombare
2021-04-13 8:29 ` [PATCH v6 0/2] enable HDCP in Cadence MHDP bridge driver Robert Foss
2 siblings, 0 replies; 5+ messages in thread
From: Parshuram Thombare @ 2021-04-10 18:15 UTC (permalink / raw)
To: robert.foss, robh+dt, laurent.pinchart, airlied, daniel
Cc: dri-devel, devicetree, linux-kernel, a.hajda, narmstrong,
nikhil.nd, kishon, sjakhade, mparab, Parshuram Thombare
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 | 128 +++-
.../drm/bridge/cadence/cdns-mhdp8546-core.h | 22 +
.../drm/bridge/cadence/cdns-mhdp8546-hdcp.c | 570 ++++++++++++++++++
.../drm/bridge/cadence/cdns-mhdp8546-hdcp.h | 92 +++
5 files changed, 801 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 989a05bc8197..01e95466502a 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 +1615,51 @@ 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 cdns_mhdp_device *mhdp = connector_to_mhdp(conn);
+ struct drm_connector_state *old_state, *new_state;
+ struct drm_crtc_state *crtc_state;
+ u64 old_cp, new_cp;
+
+ if (!mhdp->hdcp_supported)
+ return 0;
+
+ 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 +1704,10 @@ static int cdns_mhdp_connector_init(struct cdns_mhdp_device *mhdp)
return ret;
}
- return 0;
+ if (mhdp->hdcp_supported)
+ ret = drm_connector_attach_content_protection_property(conn, true);
+
+ return ret;
}
static int cdns_mhdp_attach(struct drm_bridge *bridge,
@@ -1957,6 +2002,15 @@ static void cdns_mhdp_atomic_enable(struct drm_bridge *bridge,
if (WARN_ON(!conn_state))
goto out;
+ if (mhdp->hdcp_supported &&
+ 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 +2054,9 @@ static void cdns_mhdp_atomic_disable(struct drm_bridge *bridge,
mutex_lock(&mhdp->link_mutex);
+ if (mhdp->hdcp_supported)
+ 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 +2345,6 @@ 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 +2363,54 @@ 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 +2446,15 @@ 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)) {
+ mhdp->hdcp_supported = false;
+ dev_warn(dev,
+ "Failed to get SAPB memory resource, HDCP not supported\n");
+ } else {
+ mhdp->hdcp_supported = true;
+ }
+
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 +2529,18 @@ 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;
+ if (mhdp->hdcp_supported)
+ 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..c74439d0b1a7 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 +405,18 @@ 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;
+ bool hdcp_supported;
};
#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..fccd6fbcc257
--- /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_param(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..334c0b8b0d4f
--- /dev/null
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-hdcp.h
@@ -0,0 +1,92 @@
+/* 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_set_public_key_param(struct cdns_mhdp_device *mhdp,
+ struct cdns_hdcp_tx_public_key_param *val);
+int cdns_mhdp_hdcp_set_lc(struct cdns_mhdp_device *mhdp, u8 *val);
+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
--
2.25.1
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