leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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