[PATCH v14 13/33] drm/i915: Implement the HDCP2.2 support for DP
Ramalingam C
ramalingam.c at intel.com
Mon Aug 19 15:06:24 UTC 2019
On 2019-08-15 at 11:43:54 +0300, Jani Nikula wrote:
> On Sat, 16 Feb 2019, Ramalingam C via dri-devel <dri-devel at 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 <ramalingam.c at intel.com>
> > Signed-off-by: Ankit K Nautiyal <ankit.k.nautiyal at intel.com>
> > Reviewed-by: Uma Shankar <uma.shankar at 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.
Jani,
Could you please explain why we dont like it?
Alternate i could think immediately is populate the messages in the
runtime based on the msg_id using the functions and use them.
-Ram
>
> 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
More information about the dri-devel
mailing list