On Sat, 16 Feb 2019, Ramalingam C via dri-devel
<dri-devel@lists.freedesktop.org> wrote:
> Implements the DP adaptation specific HDCP2.2 functions.
>
> These functions perform the DPCD read and write for communicating the
> HDCP2.2 auth message back and forth.
>
> v2:
> wait for cp_irq is merged with this patch. Rebased.
> v3:
> wait_queue is used for wait for cp_irq [Chris Wilson]
> v4:
> Style fixed.
> %s/PARING/PAIRING
> Few style fixes [Uma]
> v5:
> Lookup table for DP HDCP2.2 msg details [Daniel].
> Extra lines are removed.
> v6: Rebased.
> v7:
> Fixed some regression introduced at v5. [Ankit]
> Macro HDCP_2_2_RX_CAPS_VERSION_VAL is reused [Uma]
> Converted a function to inline [Uma]
> %s/uintxx_t/uxx
> v8:
> Error due to the sinks are reported as DEBUG logs.
> Adjust to the new mei interface.
> v9:
> ARRAY_SIZE for no of array members [Jon & Daniel]
> return of the wait_for_cp_irq is made as void [Daniel]
> Wait for HDCP2.2 msg is done based on polling the reg bit than
> CP_IRQ based. [Daniel]
> hdcp adaptation is added as a const in the hdcp_shim [Daniel]
> v10:
> config_stream_type is redefined [Daniel]
> DP Errata specific defines are moved into intel_dp.c.
>
> Signed-off-by: Ramalingam C <ramalinga...@intel.com>
> Signed-off-by: Ankit K Nautiyal <ankit.k.nauti...@intel.com>
> Reviewed-by: Uma Shankar <uma.shan...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_dp.c | 333
> ++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 333 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 9f73a4239574..e9fe25f21200 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -5847,6 +5847,333 @@ int intel_dp_hdcp_capable(struct intel_digital_port
> *intel_dig_port,
> return 0;
> }
>
> +struct hdcp2_dp_errata_stream_type {
> + u8 msg_id;
> + u8 stream_type;
> +} __packed;
> +
> +static struct hdcp2_dp_msg_data {
> + u8 msg_id;
> + u32 offset;
> + bool msg_detectable;
> + u32 timeout;
> + u32 timeout2; /* Added for non_paired situation */
> + } hdcp2_msg_data[] = {
> + {HDCP_2_2_AKE_INIT, DP_HDCP_2_2_AKE_INIT_OFFSET, false, 0, 0},
> + {HDCP_2_2_AKE_SEND_CERT, DP_HDCP_2_2_AKE_SEND_CERT_OFFSET,
> + false, HDCP_2_2_CERT_TIMEOUT_MS, 0},
> + {HDCP_2_2_AKE_NO_STORED_KM, DP_HDCP_2_2_AKE_NO_STORED_KM_OFFSET,
> + false, 0, 0},
> + {HDCP_2_2_AKE_STORED_KM, DP_HDCP_2_2_AKE_STORED_KM_OFFSET,
> + false, 0, 0},
> + {HDCP_2_2_AKE_SEND_HPRIME, DP_HDCP_2_2_AKE_SEND_HPRIME_OFFSET,
> + true, HDCP_2_2_HPRIME_PAIRED_TIMEOUT_MS,
> + HDCP_2_2_HPRIME_NO_PAIRED_TIMEOUT_MS},
> + {HDCP_2_2_AKE_SEND_PAIRING_INFO,
> + DP_HDCP_2_2_AKE_SEND_PAIRING_INFO_OFFSET, true,
> + HDCP_2_2_PAIRING_TIMEOUT_MS, 0},
> + {HDCP_2_2_LC_INIT, DP_HDCP_2_2_LC_INIT_OFFSET, false, 0, 0},
> + {HDCP_2_2_LC_SEND_LPRIME, DP_HDCP_2_2_LC_SEND_LPRIME_OFFSET,
> + false, HDCP_2_2_DP_LPRIME_TIMEOUT_MS, 0},
> + {HDCP_2_2_SKE_SEND_EKS, DP_HDCP_2_2_SKE_SEND_EKS_OFFSET, false,
> + 0, 0},
> + {HDCP_2_2_REP_SEND_RECVID_LIST,
> + DP_HDCP_2_2_REP_SEND_RECVID_LIST_OFFSET, true,
> + HDCP_2_2_RECVID_LIST_TIMEOUT_MS, 0},
> + {HDCP_2_2_REP_SEND_ACK, DP_HDCP_2_2_REP_SEND_ACK_OFFSET, false,
> + 0, 0},
> + {HDCP_2_2_REP_STREAM_MANAGE,
> + DP_HDCP_2_2_REP_STREAM_MANAGE_OFFSET, false,
> + 0, 0},
> + {HDCP_2_2_REP_STREAM_READY, DP_HDCP_2_2_REP_STREAM_READY_OFFSET,
> + false, HDCP_2_2_STREAM_READY_TIMEOUT_MS, 0},
> +/* local define to shovel this through the write_2_2 interface */
> +#define HDCP_2_2_ERRATA_DP_STREAM_TYPE 50
> + {HDCP_2_2_ERRATA_DP_STREAM_TYPE,
> + DP_HDCP_2_2_REG_STREAM_TYPE_OFFSET, false,
> + 0, 0},
> + };
Hate to bring this up so far after this has been merged, but
hdcp2_msg_data[] must be moved out of driver static data.
BR,
Jani.
> +
> +static inline
> +int intel_dp_hdcp2_read_rx_status(struct intel_digital_port *intel_dig_port,
> + u8 *rx_status)
> +{
> + ssize_t ret;
> +
> + ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux,
> + DP_HDCP_2_2_REG_RXSTATUS_OFFSET, rx_status,
> + HDCP_2_2_DP_RXSTATUS_LEN);
> + if (ret != HDCP_2_2_DP_RXSTATUS_LEN) {
> + DRM_DEBUG_KMS("Read bstatus from DP/AUX failed (%zd)\n", ret);
> + return ret >= 0 ? -EIO : ret;
> + }
> +
> + return 0;
> +}
> +
> +static
> +int hdcp2_detect_msg_availability(struct intel_digital_port *intel_dig_port,
> + u8 msg_id, bool *msg_ready)
> +{
> + u8 rx_status;
> + int ret;
> +
> + *msg_ready = false;
> + ret = intel_dp_hdcp2_read_rx_status(intel_dig_port, &rx_status);
> + if (ret < 0)
> + return ret;
> +
> + switch (msg_id) {
> + case HDCP_2_2_AKE_SEND_HPRIME:
> + if (HDCP_2_2_DP_RXSTATUS_H_PRIME(rx_status))
> + *msg_ready = true;
> + break;
> + case HDCP_2_2_AKE_SEND_PAIRING_INFO:
> + if (HDCP_2_2_DP_RXSTATUS_PAIRING(rx_status))
> + *msg_ready = true;
> + break;
> + case HDCP_2_2_REP_SEND_RECVID_LIST:
> + if (HDCP_2_2_DP_RXSTATUS_READY(rx_status))
> + *msg_ready = true;
> + break;
> + default:
> + DRM_ERROR("Unidentified msg_id: %d\n", msg_id);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static ssize_t
> +intel_dp_hdcp2_wait_for_msg(struct intel_digital_port *intel_dig_port,
> + struct hdcp2_dp_msg_data *hdcp2_msg_data)
> +{
> + struct intel_dp *dp = &intel_dig_port->dp;
> + struct intel_hdcp *hdcp = &dp->attached_connector->hdcp;
> + u8 msg_id = hdcp2_msg_data->msg_id;
> + int ret, timeout;
> + bool msg_ready = false;
> +
> + if (msg_id == HDCP_2_2_AKE_SEND_HPRIME && !hdcp->is_paired)
> + timeout = hdcp2_msg_data->timeout2;
> + else
> + timeout = hdcp2_msg_data->timeout;
> +
> + /*
> + * There is no way to detect the CERT, LPRIME and STREAM_READY
> + * availability. So Wait for timeout and read the msg.
> + */
> + if (!hdcp2_msg_data->msg_detectable) {
> + mdelay(timeout);
> + ret = 0;
> + } else {
> + /* TODO: In case if you need to wait on CP_IRQ, do it here */
> + ret = __wait_for(ret =
> + hdcp2_detect_msg_availability(intel_dig_port,
> + msg_id,
> + &msg_ready),
> + !ret && msg_ready, timeout * 1000,
> + 1000, 5 * 1000);
> +
> + if (!msg_ready)
> + ret = -ETIMEDOUT;
> + }
> +
> + if (ret)
> + DRM_DEBUG_KMS("msg_id %d, ret %d, timeout(mSec): %d\n",
> + hdcp2_msg_data->msg_id, ret, timeout);
> +
> + return ret;
> +}
> +
> +static struct hdcp2_dp_msg_data *get_hdcp2_dp_msg_data(u8 msg_id)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(hdcp2_msg_data); i++)
> + if (hdcp2_msg_data[i].msg_id == msg_id)
> + return &hdcp2_msg_data[i];
> +
> + return NULL;
> +}
> +
> +static
> +int intel_dp_hdcp2_write_msg(struct intel_digital_port *intel_dig_port,
> + void *buf, size_t size)
> +{
> + unsigned int offset;
> + u8 *byte = buf;
> + ssize_t ret, bytes_to_write, len;
> + struct hdcp2_dp_msg_data *hdcp2_msg_data;
> +
> + hdcp2_msg_data = get_hdcp2_dp_msg_data(*byte);
> + if (!hdcp2_msg_data)
> + return -EINVAL;
> +
> + offset = hdcp2_msg_data->offset;
> +
> + /* No msg_id in DP HDCP2.2 msgs */
> + bytes_to_write = size - 1;
> + byte++;
> +
> + while (bytes_to_write) {
> + len = bytes_to_write > DP_AUX_MAX_PAYLOAD_BYTES ?
> + DP_AUX_MAX_PAYLOAD_BYTES : bytes_to_write;
> +
> + ret = drm_dp_dpcd_write(&intel_dig_port->dp.aux,
> + offset, (void *)byte, len);
> + if (ret < 0)
> + return ret;
> +
> + bytes_to_write -= ret;
> + byte += ret;
> + offset += ret;
> + }
> +
> + return size;
> +}
> +
> +static
> +ssize_t get_receiver_id_list_size(struct intel_digital_port *intel_dig_port)
> +{
> + u8 rx_info[HDCP_2_2_RXINFO_LEN];
> + u32 dev_cnt;
> + ssize_t ret;
> +
> + ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux,
> + DP_HDCP_2_2_REG_RXINFO_OFFSET,
> + (void *)rx_info, HDCP_2_2_RXINFO_LEN);
> + if (ret != HDCP_2_2_RXINFO_LEN)
> + return ret >= 0 ? -EIO : ret;
> +
> + dev_cnt = (HDCP_2_2_DEV_COUNT_HI(rx_info[0]) << 4 |
> + HDCP_2_2_DEV_COUNT_LO(rx_info[1]));
> +
> + if (dev_cnt > HDCP_2_2_MAX_DEVICE_COUNT)
> + dev_cnt = HDCP_2_2_MAX_DEVICE_COUNT;
> +
> + ret = sizeof(struct hdcp2_rep_send_receiverid_list) -
> + HDCP_2_2_RECEIVER_IDS_MAX_LEN +
> + (dev_cnt * HDCP_2_2_RECEIVER_ID_LEN);
> +
> + return ret;
> +}
> +
> +static
> +int intel_dp_hdcp2_read_msg(struct intel_digital_port *intel_dig_port,
> + u8 msg_id, void *buf, size_t size)
> +{
> + unsigned int offset;
> + u8 *byte = buf;
> + ssize_t ret, bytes_to_recv, len;
> + struct hdcp2_dp_msg_data *hdcp2_msg_data;
> +
> + hdcp2_msg_data = get_hdcp2_dp_msg_data(msg_id);
> + if (!hdcp2_msg_data)
> + return -EINVAL;
> + offset = hdcp2_msg_data->offset;
> +
> + ret = intel_dp_hdcp2_wait_for_msg(intel_dig_port, hdcp2_msg_data);
> + if (ret < 0)
> + return ret;
> +
> + if (msg_id == HDCP_2_2_REP_SEND_RECVID_LIST) {
> + ret = get_receiver_id_list_size(intel_dig_port);
> + if (ret < 0)
> + return ret;
> +
> + size = ret;
> + }
> + bytes_to_recv = size - 1;
> +
> + /* DP adaptation msgs has no msg_id */
> + byte++;
> +
> + while (bytes_to_recv) {
> + len = bytes_to_recv > DP_AUX_MAX_PAYLOAD_BYTES ?
> + DP_AUX_MAX_PAYLOAD_BYTES : bytes_to_recv;
> +
> + ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux, offset,
> + (void *)byte, len);
> + if (ret < 0) {
> + DRM_DEBUG_KMS("msg_id %d, ret %zd\n", msg_id, ret);
> + return ret;
> + }
> +
> + bytes_to_recv -= ret;
> + byte += ret;
> + offset += ret;
> + }
> + byte = buf;
> + *byte = msg_id;
> +
> + return size;
> +}
> +
> +static
> +int intel_dp_hdcp2_config_stream_type(struct intel_digital_port
> *intel_dig_port,
> + bool is_repeater, u8 content_type)
> +{
> + struct hdcp2_dp_errata_stream_type stream_type_msg;
> +
> + if (is_repeater)
> + return 0;
> +
> + /*
> + * Errata for DP: As Stream type is used for encryption, Receiver
> + * should be communicated with stream type for the decryption of the
> + * content.
> + * Repeater will be communicated with stream type as a part of it's
> + * auth later in time.
> + */
> + stream_type_msg.msg_id = HDCP_2_2_ERRATA_DP_STREAM_TYPE;
> + stream_type_msg.stream_type = content_type;
> +
> + return intel_dp_hdcp2_write_msg(intel_dig_port, &stream_type_msg,
> + sizeof(stream_type_msg));
> +}
> +
> +static
> +int intel_dp_hdcp2_check_link(struct intel_digital_port *intel_dig_port)
> +{
> + u8 rx_status;
> + int ret;
> +
> + ret = intel_dp_hdcp2_read_rx_status(intel_dig_port, &rx_status);
> + if (ret)
> + return ret;
> +
> + if (HDCP_2_2_DP_RXSTATUS_REAUTH_REQ(rx_status))
> + ret = HDCP_REAUTH_REQUEST;
> + else if (HDCP_2_2_DP_RXSTATUS_LINK_FAILED(rx_status))
> + ret = HDCP_LINK_INTEGRITY_FAILURE;
> + else if (HDCP_2_2_DP_RXSTATUS_READY(rx_status))
> + ret = HDCP_TOPOLOGY_CHANGE;
> +
> + return ret;
> +}
> +
> +static
> +int intel_dp_hdcp2_capable(struct intel_digital_port *intel_dig_port,
> + bool *capable)
> +{
> + u8 rx_caps[3];
> + int ret;
> +
> + *capable = false;
> + ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux,
> + DP_HDCP_2_2_REG_RX_CAPS_OFFSET,
> + rx_caps, HDCP_2_2_RXCAPS_LEN);
> + if (ret != HDCP_2_2_RXCAPS_LEN)
> + return ret >= 0 ? -EIO : ret;
> +
> + if (rx_caps[0] == HDCP_2_2_RX_CAPS_VERSION_VAL &&
> + HDCP_2_2_DP_HDCP_CAPABLE(rx_caps[2]))
> + *capable = true;
> +
> + return 0;
> +}
> +
> static const struct intel_hdcp_shim intel_dp_hdcp_shim = {
> .write_an_aksv = intel_dp_hdcp_write_an_aksv,
> .read_bksv = intel_dp_hdcp_read_bksv,
> @@ -5859,6 +6186,12 @@ static const struct intel_hdcp_shim intel_dp_hdcp_shim
> = {
> .toggle_signalling = intel_dp_hdcp_toggle_signalling,
> .check_link = intel_dp_hdcp_check_link,
> .hdcp_capable = intel_dp_hdcp_capable,
> + .write_2_2_msg = intel_dp_hdcp2_write_msg,
> + .read_2_2_msg = intel_dp_hdcp2_read_msg,
> + .config_stream_type = intel_dp_hdcp2_config_stream_type,
> + .check_2_2_link = intel_dp_hdcp2_check_link,
> + .hdcp_2_2_capable = intel_dp_hdcp2_capable,
> + .protocol = HDCP_PROTOCOL_DP,
> };
>
> static void intel_edp_panel_vdd_sanitize(struct intel_dp *intel_dp)
--
Jani Nikula, Intel Open Source Graphics Center
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