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drm/i915/hdcp: Add DP HDCP2.2 timeout to read entire msg

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As documented in HDCP 2.2 DP Errata spec transmitter should abort the
authentication protocol in case transmitter has not received the
entire {AKE_Send_Cert, AKE_Send_H_prime, AKE_Send_Paring_Info} msg
within {110,7,5} miliseconds.

Adding above msg timeout values and aborting the HDCP authentication
in case it timedout to read entire msg.

https://www.digital-cp.com/sites/default/files/HDCP%202_2_DisplayPort_Errata_v3_0.pdf

v2:
- Removed redundant variable msg_can_timedout. [Ankit]

Cc: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210324113012.7564-2-anshuman.gupta@intel.com
This commit is contained in:
Anshuman Gupta 2021-03-24 17:00:11 +05:30 committed by Jani Nikula
parent 04b6603d13
commit 989cf9a938
2 changed files with 35 additions and 13 deletions
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45
drivers/gpu/drm/i915/display/intel_dp_hdcp.c
View file

@ -294,37 +294,39 @@ struct hdcp2_dp_msg_data {
bool msg_detectable;
u32 timeout;
u32 timeout2; /* Added for non_paired situation */
/* Timeout to read entire msg */
u32 msg_read_timeout;
};
static const struct hdcp2_dp_msg_data hdcp2_dp_msg_data[] = {
{ HDCP_2_2_AKE_INIT, DP_HDCP_2_2_AKE_INIT_OFFSET, false, 0, 0 },
{ HDCP_2_2_AKE_INIT, DP_HDCP_2_2_AKE_INIT_OFFSET, false, 0, 0, 0},
{ HDCP_2_2_AKE_SEND_CERT, DP_HDCP_2_2_AKE_SEND_CERT_OFFSET,
false, HDCP_2_2_CERT_TIMEOUT_MS, 0 },
false, HDCP_2_2_CERT_TIMEOUT_MS, 0, HDCP_2_2_DP_CERT_READ_TIMEOUT_MS},
{ HDCP_2_2_AKE_NO_STORED_KM, DP_HDCP_2_2_AKE_NO_STORED_KM_OFFSET,
false, 0, 0 },
false, 0, 0, 0 },
{ HDCP_2_2_AKE_STORED_KM, DP_HDCP_2_2_AKE_STORED_KM_OFFSET,
false, 0, 0 },
false, 0, 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_HPRIME_NO_PAIRED_TIMEOUT_MS, HDCP_2_2_DP_HPRIME_READ_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_PAIRING_TIMEOUT_MS, 0, HDCP_2_2_DP_PAIRING_READ_TIMEOUT_MS },
{ HDCP_2_2_LC_INIT, DP_HDCP_2_2_LC_INIT_OFFSET, false, 0, 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 },
false, HDCP_2_2_DP_LPRIME_TIMEOUT_MS, 0, 0 },
{ HDCP_2_2_SKE_SEND_EKS, DP_HDCP_2_2_SKE_SEND_EKS_OFFSET, false,
0, 0 },
0, 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_RECVID_LIST_TIMEOUT_MS, 0, 0 },
{ HDCP_2_2_REP_SEND_ACK, DP_HDCP_2_2_REP_SEND_ACK_OFFSET, false,
0, 0 },
0, 0, 0 },
{ HDCP_2_2_REP_STREAM_MANAGE,
DP_HDCP_2_2_REP_STREAM_MANAGE_OFFSET, false,
0, 0 },
0, 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 },
false, HDCP_2_2_STREAM_READY_TIMEOUT_MS, 0, 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,
@ -530,6 +532,8 @@ int intel_dp_hdcp2_read_msg(struct intel_digital_port *dig_port,
u8 *byte = buf;
ssize_t ret, bytes_to_recv, len;
const struct hdcp2_dp_msg_data *hdcp2_msg_data;
ktime_t msg_end;
bool msg_expired;
hdcp2_msg_data = get_hdcp2_dp_msg_data(msg_id);
if (!hdcp2_msg_data)
@ -556,6 +560,11 @@ int intel_dp_hdcp2_read_msg(struct intel_digital_port *dig_port,
len = bytes_to_recv > DP_AUX_MAX_PAYLOAD_BYTES ?
DP_AUX_MAX_PAYLOAD_BYTES : bytes_to_recv;
/* Entire msg read timeout since initiate of msg read */
if (bytes_to_recv == size - 1 && hdcp2_msg_data->msg_read_timeout > 0)
msg_end = ktime_add_ms(ktime_get_raw(),
hdcp2_msg_data->msg_read_timeout);
ret = drm_dp_dpcd_read(&dig_port->dp.aux, offset,
(void *)byte, len);
if (ret < 0) {
@ -568,6 +577,16 @@ int intel_dp_hdcp2_read_msg(struct intel_digital_port *dig_port,
byte += ret;
offset += ret;
}
if (hdcp2_msg_data->msg_read_timeout > 0) {
msg_expired = ktime_after(ktime_get_raw(), msg_end);
if (msg_expired) {
drm_dbg_kms(&i915->drm, "msg_id %d, entire msg read timeout(mSec): %d\n",
msg_id, hdcp2_msg_data->msg_read_timeout);
return -ETIMEDOUT;
}
}
byte = buf;
*byte = msg_id;

3
include/drm/drm_hdcp.h
View file

@ -224,9 +224,12 @@ struct hdcp2_rep_stream_ready {
/* HDCP2.2 TIMEOUTs in mSec */
#define HDCP_2_2_CERT_TIMEOUT_MS 100
#define HDCP_2_2_DP_CERT_READ_TIMEOUT_MS 110
#define HDCP_2_2_HPRIME_NO_PAIRED_TIMEOUT_MS 1000
#define HDCP_2_2_HPRIME_PAIRED_TIMEOUT_MS 200
#define HDCP_2_2_DP_HPRIME_READ_TIMEOUT_MS 7
#define HDCP_2_2_PAIRING_TIMEOUT_MS 200
#define HDCP_2_2_DP_PAIRING_READ_TIMEOUT_MS 5
#define HDCP_2_2_HDMI_LPRIME_TIMEOUT_MS 20
#define HDCP_2_2_DP_LPRIME_TIMEOUT_MS 7
#define HDCP_2_2_RECVID_LIST_TIMEOUT_MS 3000