[PATCH 2/2] drm: bridge: cdns-mhdp8546: Enable HDCP
Robert Foss
robert.foss at linaro.org
Fri Feb 26 17:42:20 UTC 2021
Hey Parshuram,
This patch looks good to me.
Reviewed-by: Robert Foss <robert.foss at linaro.org>
On Fri, 26 Feb 2021 at 17:18, Parshuram Thombare <pthombar at cadence.com> wrote:
>
> This patch enable HDCP in MHDP driver.
>
> Signed-off-by: Parshuram Thombare <pthombar at cadence.com>
> ---
> drivers/gpu/drm/bridge/cadence/Makefile | 2 +-
> .../drm/bridge/cadence/cdns-mhdp8546-core.c | 105 +++-
> .../drm/bridge/cadence/cdns-mhdp8546-core.h | 21 +
> .../drm/bridge/cadence/cdns-mhdp8546-hdcp.c | 578 ++++++++++++++++++
> .../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..e2d75fc596f6 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 +1615,40 @@ 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 (!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;
> +
> + 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 +1693,7 @@ 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,
> @@ -1956,6 +1987,13 @@ static void cdns_mhdp_atomic_enable(struct drm_bridge *bridge,
> conn_state = drm_atomic_get_new_connector_state(state, connector);
> if (WARN_ON(!conn_state))
> goto out;
> + if (conn_state->content_protection ==
> + DRM_MODE_CONTENT_PROTECTION_DESIRED &&
> + mhdp->hw_state == MHDP_HW_READY) {
> + mutex_unlock(&mhdp->link_mutex);
> + cdns_mhdp_hdcp_enable(mhdp);
> + mutex_lock(&mhdp->link_mutex);
> + }
>
> crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
> if (WARN_ON(!crtc_state))
> @@ -2000,6 +2038,7 @@ 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 +2327,6 @@ 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 +2345,54 @@ 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 +2428,12 @@ static int cdns_mhdp_probe(struct platform_device *pdev)
> return PTR_ERR(mhdp->regs);
> }
>
> + mhdp->sapb_regs = devm_platform_ioremap_resource(pdev, 2);
> + 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 +2508,16 @@ 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, pdev->dev.of_node);
> 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..0d652569e487 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 config;
> +};
> +
> 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..c0ee8235ffa9
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-hdcp.c
> @@ -0,0 +1,578 @@
> +// 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 "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)
> +{
> + int ret, tries = 3;
> + u32 i;
> +
> + for (i = 0; i < tries; i++) {
> + if (mhdp->hdcp.config & HDCP_CONFIG_2_2) {
> + ret = cdns_mhdp_hdcp_auth(mhdp, HDCP_TX_2);
> + if (!ret)
> + return 0;
> + }
> + _cdns_mhdp_hdcp_disable(mhdp);
> +
> + if (mhdp->hdcp.config & HDCP_CONFIG_1_4) {
> + 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);
> + 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)
> +{
> + int ret;
> +
> + mutex_lock(&mhdp->hdcp.mutex);
> + ret = _cdns_mhdp_hdcp_enable(mhdp);
> + if (ret)
> + goto out;
> +
> + 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;
> +}
> +
> +int cdns_mhdp_hdcp_init(struct cdns_mhdp_device *mhdp,
> + struct device_node *of_node)
> +{
> + u32 config;
> + int ret;
> +
> + ret = of_property_read_u32(of_node, "hdcp-config", &config);
> + if (ret)
> + mhdp->hdcp.config = HDCP_CONFIG_ALL;
> + else
> + mhdp->hdcp.config = config;
> +
> + 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);
> +
> + return 0;
> +}
> 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..fc694a9e4c04
> --- /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);
> +int cdns_mhdp_hdcp_disable(struct cdns_mhdp_device *mhdp);
> +int cdns_mhdp_hdcp_init(struct cdns_mhdp_device *mhdp, struct device_node *of_node);
> +
> +#endif
> --
> 2.25.1
>
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