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drm/i915: Factor out HDCP shim functions from dp for use by dp_mst

Browse Source 
These functions are all the same for dp and dp_mst, so move them into a
dedicated file for both sst and mst to use.

Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191203173638.94919-11-sean@poorly.run #v1
Link: https://patchwork.freedesktop.org/patch/msgid/20191212190230.188505-12-sean@poorly.run #v2
Link: https://patchwork.freedesktop.org/patch/msgid/20200117193103.156821-12-sean@poorly.run #v3
Link: https://patchwork.freedesktop.org/patch/msgid/20200218220242.107265-12-sean@poorly.run #v4
Link: https://patchwork.freedesktop.org/patch/msgid/20200305201236.152307-12-sean@poorly.run #v5
Link: https://patchwork.freedesktop.org/patch/msgid/20200429195502.39919-12-sean@poorly.run #v6
Link: https://patchwork.freedesktop.org/patch/msgid/20200623155907.22961-13-sean@poorly.run #v7

Changes in v2:
-None
Changes in v3:
-Created intel_dp_hdcp.c for the shared functions to live (Ville)
Changes in v4:
-Rebased on new drm logging change
Changes in v5:
-None
Changes in v6:
-None
Changes in v7:
-Rebased patch
Changes in v8:
-None

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200818153910.27894-13-sean@poorly.run
This commit is contained in:
Sean Paul 2020-08-18 11:39:00 -04:00 committed by Ramalingam C
parent f1c7a36b05
commit d079b7e4b6
4 changed files with 642 additions and 606 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/Makefile
View File

@ -234,6 +234,7 @@ i915-y += \
display/intel_ddi.o \
display/intel_dp.o \
display/intel_dp_aux_backlight.o \
display/intel_dp_hdcp.o \
display/intel_dp_link_training.o \
display/intel_dp_mst.o \
display/intel_dsi.o \

607
drivers/gpu/drm/i915/display/intel_dp.c
View File

@ -38,7 +38,6 @@
#include <drm/drm_crtc.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_hdcp.h>
#include <drm/drm_probe_helper.h>
#include "i915_debugfs.h"
@ -6414,610 +6413,6 @@ void intel_dp_encoder_suspend(struct intel_encoder *intel_encoder)
edp_panel_vdd_off_sync(intel_dp);
}
static void intel_dp_hdcp_wait_for_cp_irq(struct intel_hdcp *hdcp, int timeout)
{
long ret;
#define C (hdcp->cp_irq_count_cached != atomic_read(&hdcp->cp_irq_count))
ret = wait_event_interruptible_timeout(hdcp->cp_irq_queue, C,
msecs_to_jiffies(timeout));
if (!ret)
DRM_DEBUG_KMS("Timedout at waiting for CP_IRQ\n");
}
static
int intel_dp_hdcp_write_an_aksv(struct intel_digital_port *dig_port,
u8 *an)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
u8 aksv[DRM_HDCP_KSV_LEN] = {};
ssize_t dpcd_ret;
/* Output An first, that's easy */
dpcd_ret = drm_dp_dpcd_write(&dig_port->dp.aux, DP_AUX_HDCP_AN,
an, DRM_HDCP_AN_LEN);
if (dpcd_ret != DRM_HDCP_AN_LEN) {
drm_dbg_kms(&i915->drm,
"Failed to write An over DP/AUX (%zd)\n",
dpcd_ret);
return dpcd_ret >= 0 ? -EIO : dpcd_ret;
}
/*
* Since Aksv is Oh-So-Secret, we can't access it in software. So we
* send an empty buffer of the correct length through the DP helpers. On
* the other side, in the transfer hook, we'll generate a flag based on
* the destination address which will tickle the hardware to output the
* Aksv on our behalf after the header is sent.
*/
dpcd_ret = drm_dp_dpcd_write(&dig_port->dp.aux, DP_AUX_HDCP_AKSV,
aksv, DRM_HDCP_KSV_LEN);
if (dpcd_ret != DRM_HDCP_KSV_LEN) {
drm_dbg_kms(&i915->drm,
"Failed to write Aksv over DP/AUX (%zd)\n",
dpcd_ret);
return dpcd_ret >= 0 ? -EIO : dpcd_ret;
}
return 0;
}
static int intel_dp_hdcp_read_bksv(struct intel_digital_port *dig_port,
u8 *bksv)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BKSV, bksv,
DRM_HDCP_KSV_LEN);
if (ret != DRM_HDCP_KSV_LEN) {
drm_dbg_kms(&i915->drm,
"Read Bksv from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static int intel_dp_hdcp_read_bstatus(struct intel_digital_port *dig_port,
u8 *bstatus)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
/*
* For some reason the HDMI and DP HDCP specs call this register
* definition by different names. In the HDMI spec, it's called BSTATUS,
* but in DP it's called BINFO.
*/
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BINFO,
bstatus, DRM_HDCP_BSTATUS_LEN);
if (ret != DRM_HDCP_BSTATUS_LEN) {
drm_dbg_kms(&i915->drm,
"Read bstatus from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_read_bcaps(struct intel_digital_port *dig_port,
u8 *bcaps)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BCAPS,
bcaps, 1);
if (ret != 1) {
drm_dbg_kms(&i915->drm,
"Read bcaps from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_repeater_present(struct intel_digital_port *dig_port,
bool *repeater_present)
{
ssize_t ret;
u8 bcaps;
ret = intel_dp_hdcp_read_bcaps(dig_port, &bcaps);
if (ret)
return ret;
*repeater_present = bcaps & DP_BCAPS_REPEATER_PRESENT;
return 0;
}
static
int intel_dp_hdcp_read_ri_prime(struct intel_digital_port *dig_port,
u8 *ri_prime)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_RI_PRIME,
ri_prime, DRM_HDCP_RI_LEN);
if (ret != DRM_HDCP_RI_LEN) {
drm_dbg_kms(&i915->drm, "Read Ri' from DP/AUX failed (%zd)\n",
ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_read_ksv_ready(struct intel_digital_port *dig_port,
bool *ksv_ready)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
u8 bstatus;
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BSTATUS,
&bstatus, 1);
if (ret != 1) {
drm_dbg_kms(&i915->drm,
"Read bstatus from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
*ksv_ready = bstatus & DP_BSTATUS_READY;
return 0;
}
static
int intel_dp_hdcp_read_ksv_fifo(struct intel_digital_port *dig_port,
int num_downstream, u8 *ksv_fifo)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
int i;
/* KSV list is read via 15 byte window (3 entries @ 5 bytes each) */
for (i = 0; i < num_downstream; i += 3) {
size_t len = min(num_downstream - i, 3) * DRM_HDCP_KSV_LEN;
ret = drm_dp_dpcd_read(&dig_port->dp.aux,
DP_AUX_HDCP_KSV_FIFO,
ksv_fifo + i * DRM_HDCP_KSV_LEN,
len);
if (ret != len) {
drm_dbg_kms(&i915->drm,
"Read ksv[%d] from DP/AUX failed (%zd)\n",
i, ret);
return ret >= 0 ? -EIO : ret;
}
}
return 0;
}
static
int intel_dp_hdcp_read_v_prime_part(struct intel_digital_port *dig_port,
int i, u32 *part)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
if (i >= DRM_HDCP_V_PRIME_NUM_PARTS)
return -EINVAL;
ret = drm_dp_dpcd_read(&dig_port->dp.aux,
DP_AUX_HDCP_V_PRIME(i), part,
DRM_HDCP_V_PRIME_PART_LEN);
if (ret != DRM_HDCP_V_PRIME_PART_LEN) {
drm_dbg_kms(&i915->drm,
"Read v'[%d] from DP/AUX failed (%zd)\n", i, ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_toggle_signalling(struct intel_digital_port *dig_port,
enum transcoder cpu_transcoder,
bool enable)
{
/* Not used for single stream DisplayPort setups */
return 0;
}
static
bool intel_dp_hdcp_check_link(struct intel_digital_port *dig_port)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
u8 bstatus;
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BSTATUS,
&bstatus, 1);
if (ret != 1) {
drm_dbg_kms(&i915->drm,
"Read bstatus from DP/AUX failed (%zd)\n", ret);
return false;
}
return !(bstatus & (DP_BSTATUS_LINK_FAILURE | DP_BSTATUS_REAUTH_REQ));
}
static
int intel_dp_hdcp_capable(struct intel_digital_port *dig_port,
bool *hdcp_capable)
{
ssize_t ret;
u8 bcaps;
ret = intel_dp_hdcp_read_bcaps(dig_port, &bcaps);
if (ret)
return ret;
*hdcp_capable = bcaps & DP_BCAPS_HDCP_CAPABLE;
return 0;
}
struct hdcp2_dp_errata_stream_type {
u8 msg_id;
u8 stream_type;
} __packed;
struct hdcp2_dp_msg_data {
u8 msg_id;
u32 offset;
bool msg_detectable;
u32 timeout;
u32 timeout2; /* Added for non_paired situation */
};
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_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 },
};
static int
intel_dp_hdcp2_read_rx_status(struct intel_digital_port *dig_port,
u8 *rx_status)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
ret = drm_dp_dpcd_read(&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_dbg_kms(&i915->drm,
"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 *dig_port,
u8 msg_id, bool *msg_ready)
{
u8 rx_status;
int ret;
*msg_ready = false;
ret = intel_dp_hdcp2_read_rx_status(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 *dig_port,
const struct hdcp2_dp_msg_data *hdcp2_msg_data)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
struct intel_dp *dp = &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 {
/*
* As we want to check the msg availability at timeout, Ignoring
* the timeout at wait for CP_IRQ.
*/
intel_dp_hdcp_wait_for_cp_irq(hdcp, timeout);
ret = hdcp2_detect_msg_availability(dig_port,
msg_id, &msg_ready);
if (!msg_ready)
ret = -ETIMEDOUT;
}
if (ret)
drm_dbg_kms(&i915->drm,
"msg_id %d, ret %d, timeout(mSec): %d\n",
hdcp2_msg_data->msg_id, ret, timeout);
return ret;
}
static const struct hdcp2_dp_msg_data *get_hdcp2_dp_msg_data(u8 msg_id)
{
int i;
for (i = 0; i < ARRAY_SIZE(hdcp2_dp_msg_data); i++)
if (hdcp2_dp_msg_data[i].msg_id == msg_id)
return &hdcp2_dp_msg_data[i];
return NULL;
}
static
int intel_dp_hdcp2_write_msg(struct intel_digital_port *dig_port,
void *buf, size_t size)
{
struct intel_dp *dp = &dig_port->dp;
struct intel_hdcp *hdcp = &dp->attached_connector->hdcp;
unsigned int offset;
u8 *byte = buf;
ssize_t ret, bytes_to_write, len;
const 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++;
hdcp->cp_irq_count_cached = atomic_read(&hdcp->cp_irq_count);
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(&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 *dig_port)
{
u8 rx_info[HDCP_2_2_RXINFO_LEN];
u32 dev_cnt;
ssize_t ret;
ret = drm_dp_dpcd_read(&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 *dig_port,
u8 msg_id, void *buf, size_t size)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
unsigned int offset;
u8 *byte = buf;
ssize_t ret, bytes_to_recv, len;
const 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(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(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(&dig_port->dp.aux, offset,
(void *)byte, len);
if (ret < 0) {
drm_dbg_kms(&i915->drm, "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 *dig_port,
bool is_repeater, u8 content_type)
{
int ret;
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;
ret = intel_dp_hdcp2_write_msg(dig_port, &stream_type_msg,
sizeof(stream_type_msg));
return ret < 0 ? ret : 0;
}
static
int intel_dp_hdcp2_check_link(struct intel_digital_port *dig_port)
{
u8 rx_status;
int ret;
ret = intel_dp_hdcp2_read_rx_status(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 *dig_port,
bool *capable)
{
u8 rx_caps[3];
int ret;
*capable = false;
ret = drm_dp_dpcd_read(&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,
.read_bstatus = intel_dp_hdcp_read_bstatus,
.repeater_present = intel_dp_hdcp_repeater_present,
.read_ri_prime = intel_dp_hdcp_read_ri_prime,
.read_ksv_ready = intel_dp_hdcp_read_ksv_ready,
.read_ksv_fifo = intel_dp_hdcp_read_ksv_fifo,
.read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
.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)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
@ -8298,7 +7693,7 @@ intel_dp_init_connector(struct intel_digital_port *dig_port,
intel_dp_add_properties(intel_dp, connector);
if (is_hdcp_supported(dev_priv, port) && !intel_dp_is_edp(intel_dp)) {
int ret = intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim);
int ret = intel_dp_init_hdcp(dig_port, intel_connector);
if (ret)
drm_dbg_kms(&dev_priv->drm,
"HDCP init failed, skipping.\n");

3
drivers/gpu/drm/i915/display/intel_dp.h
View File

@ -136,4 +136,7 @@ void intel_ddi_update_pipe(struct intel_atomic_state *state,
const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state);
int intel_dp_init_hdcp(struct intel_digital_port *dig_port,
struct intel_connector *intel_connector);
#endif /* __INTEL_DP_H__ */

637
drivers/gpu/drm/i915/display/intel_dp_hdcp.c Normal file
View File

@ -0,0 +1,637 @@
/* SPDX-License-Identifier: MIT */
/*
* Copyright (C) 2020 Google, Inc.
*
* Authors:
* Sean Paul <seanpaul@chromium.org>
*/
#include <drm/drm_dp_helper.h>
#include <drm/drm_hdcp.h>
#include <drm/drm_print.h>
#include "intel_display_types.h"
#include "intel_dp.h"
#include "intel_hdcp.h"
static void intel_dp_hdcp_wait_for_cp_irq(struct intel_hdcp *hdcp, int timeout)
{
long ret;
#define C (hdcp->cp_irq_count_cached != atomic_read(&hdcp->cp_irq_count))
ret = wait_event_interruptible_timeout(hdcp->cp_irq_queue, C,
msecs_to_jiffies(timeout));
if (!ret)
DRM_DEBUG_KMS("Timedout at waiting for CP_IRQ\n");
}
static
int intel_dp_hdcp_write_an_aksv(struct intel_digital_port *dig_port,
u8 *an)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
u8 aksv[DRM_HDCP_KSV_LEN] = {};
ssize_t dpcd_ret;
/* Output An first, that's easy */
dpcd_ret = drm_dp_dpcd_write(&dig_port->dp.aux, DP_AUX_HDCP_AN,
an, DRM_HDCP_AN_LEN);
if (dpcd_ret != DRM_HDCP_AN_LEN) {
drm_dbg_kms(&i915->drm,
"Failed to write An over DP/AUX (%zd)\n",
dpcd_ret);
return dpcd_ret >= 0 ? -EIO : dpcd_ret;
}
/*
* Since Aksv is Oh-So-Secret, we can't access it in software. So we
* send an empty buffer of the correct length through the DP helpers. On
* the other side, in the transfer hook, we'll generate a flag based on
* the destination address which will tickle the hardware to output the
* Aksv on our behalf after the header is sent.
*/
dpcd_ret = drm_dp_dpcd_write(&dig_port->dp.aux, DP_AUX_HDCP_AKSV,
aksv, DRM_HDCP_KSV_LEN);
if (dpcd_ret != DRM_HDCP_KSV_LEN) {
drm_dbg_kms(&i915->drm,
"Failed to write Aksv over DP/AUX (%zd)\n",
dpcd_ret);
return dpcd_ret >= 0 ? -EIO : dpcd_ret;
}
return 0;
}
static int intel_dp_hdcp_read_bksv(struct intel_digital_port *dig_port,
u8 *bksv)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BKSV, bksv,
DRM_HDCP_KSV_LEN);
if (ret != DRM_HDCP_KSV_LEN) {
drm_dbg_kms(&i915->drm,
"Read Bksv from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static int intel_dp_hdcp_read_bstatus(struct intel_digital_port *dig_port,
u8 *bstatus)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
/*
* For some reason the HDMI and DP HDCP specs call this register
* definition by different names. In the HDMI spec, it's called BSTATUS,
* but in DP it's called BINFO.
*/
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BINFO,
bstatus, DRM_HDCP_BSTATUS_LEN);
if (ret != DRM_HDCP_BSTATUS_LEN) {
drm_dbg_kms(&i915->drm,
"Read bstatus from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_read_bcaps(struct intel_digital_port *dig_port,
u8 *bcaps)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BCAPS,
bcaps, 1);
if (ret != 1) {
drm_dbg_kms(&i915->drm,
"Read bcaps from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_repeater_present(struct intel_digital_port *dig_port,
bool *repeater_present)
{
ssize_t ret;
u8 bcaps;
ret = intel_dp_hdcp_read_bcaps(dig_port, &bcaps);
if (ret)
return ret;
*repeater_present = bcaps & DP_BCAPS_REPEATER_PRESENT;
return 0;
}
static
int intel_dp_hdcp_read_ri_prime(struct intel_digital_port *dig_port,
u8 *ri_prime)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_RI_PRIME,
ri_prime, DRM_HDCP_RI_LEN);
if (ret != DRM_HDCP_RI_LEN) {
drm_dbg_kms(&i915->drm, "Read Ri' from DP/AUX failed (%zd)\n",
ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_read_ksv_ready(struct intel_digital_port *dig_port,
bool *ksv_ready)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
u8 bstatus;
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BSTATUS,
&bstatus, 1);
if (ret != 1) {
drm_dbg_kms(&i915->drm,
"Read bstatus from DP/AUX failed (%zd)\n", ret);
return ret >= 0 ? -EIO : ret;
}
*ksv_ready = bstatus & DP_BSTATUS_READY;
return 0;
}
static
int intel_dp_hdcp_read_ksv_fifo(struct intel_digital_port *dig_port,
int num_downstream, u8 *ksv_fifo)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
int i;
/* KSV list is read via 15 byte window (3 entries @ 5 bytes each) */
for (i = 0; i < num_downstream; i += 3) {
size_t len = min(num_downstream - i, 3) * DRM_HDCP_KSV_LEN;
ret = drm_dp_dpcd_read(&dig_port->dp.aux,
DP_AUX_HDCP_KSV_FIFO,
ksv_fifo + i * DRM_HDCP_KSV_LEN,
len);
if (ret != len) {
drm_dbg_kms(&i915->drm,
"Read ksv[%d] from DP/AUX failed (%zd)\n",
i, ret);
return ret >= 0 ? -EIO : ret;
}
}
return 0;
}
static
int intel_dp_hdcp_read_v_prime_part(struct intel_digital_port *dig_port,
int i, u32 *part)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
if (i >= DRM_HDCP_V_PRIME_NUM_PARTS)
return -EINVAL;
ret = drm_dp_dpcd_read(&dig_port->dp.aux,
DP_AUX_HDCP_V_PRIME(i), part,
DRM_HDCP_V_PRIME_PART_LEN);
if (ret != DRM_HDCP_V_PRIME_PART_LEN) {
drm_dbg_kms(&i915->drm,
"Read v'[%d] from DP/AUX failed (%zd)\n", i, ret);
return ret >= 0 ? -EIO : ret;
}
return 0;
}
static
int intel_dp_hdcp_toggle_signalling(struct intel_digital_port *dig_port,
enum transcoder cpu_transcoder,
bool enable)
{
/* Not used for single stream DisplayPort setups */
return 0;
}
static
bool intel_dp_hdcp_check_link(struct intel_digital_port *dig_port)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
u8 bstatus;
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BSTATUS,
&bstatus, 1);
if (ret != 1) {
drm_dbg_kms(&i915->drm,
"Read bstatus from DP/AUX failed (%zd)\n", ret);
return false;
}
return !(bstatus & (DP_BSTATUS_LINK_FAILURE | DP_BSTATUS_REAUTH_REQ));
}
static
int intel_dp_hdcp_capable(struct intel_digital_port *dig_port,
bool *hdcp_capable)
{
ssize_t ret;
u8 bcaps;
ret = intel_dp_hdcp_read_bcaps(dig_port, &bcaps);
if (ret)
return ret;
*hdcp_capable = bcaps & DP_BCAPS_HDCP_CAPABLE;
return 0;
}
struct hdcp2_dp_errata_stream_type {
u8 msg_id;
u8 stream_type;
} __packed;
struct hdcp2_dp_msg_data {
u8 msg_id;
u32 offset;
bool msg_detectable;
u32 timeout;
u32 timeout2; /* Added for non_paired situation */
};
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_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 },
};
static int
intel_dp_hdcp2_read_rx_status(struct intel_digital_port *dig_port,
u8 *rx_status)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
ssize_t ret;
ret = drm_dp_dpcd_read(&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_dbg_kms(&i915->drm,
"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 *dig_port,
u8 msg_id, bool *msg_ready)
{
u8 rx_status;
int ret;
*msg_ready = false;
ret = intel_dp_hdcp2_read_rx_status(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 *dig_port,
const struct hdcp2_dp_msg_data *hdcp2_msg_data)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
struct intel_dp *dp = &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 {
/*
* As we want to check the msg availability at timeout, Ignoring
* the timeout at wait for CP_IRQ.
*/
intel_dp_hdcp_wait_for_cp_irq(hdcp, timeout);
ret = hdcp2_detect_msg_availability(dig_port,
msg_id, &msg_ready);
if (!msg_ready)
ret = -ETIMEDOUT;
}
if (ret)
drm_dbg_kms(&i915->drm,
"msg_id %d, ret %d, timeout(mSec): %d\n",
hdcp2_msg_data->msg_id, ret, timeout);
return ret;
}
static const struct hdcp2_dp_msg_data *get_hdcp2_dp_msg_data(u8 msg_id)
{
int i;
for (i = 0; i < ARRAY_SIZE(hdcp2_dp_msg_data); i++)
if (hdcp2_dp_msg_data[i].msg_id == msg_id)
return &hdcp2_dp_msg_data[i];
return NULL;
}
static
int intel_dp_hdcp2_write_msg(struct intel_digital_port *dig_port,
void *buf, size_t size)
{
struct intel_dp *dp = &dig_port->dp;
struct intel_hdcp *hdcp = &dp->attached_connector->hdcp;
unsigned int offset;
u8 *byte = buf;
ssize_t ret, bytes_to_write, len;
const 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++;
hdcp->cp_irq_count_cached = atomic_read(&hdcp->cp_irq_count);
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(&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 *dig_port)
{
u8 rx_info[HDCP_2_2_RXINFO_LEN];
u32 dev_cnt;
ssize_t ret;
ret = drm_dp_dpcd_read(&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 *dig_port,
u8 msg_id, void *buf, size_t size)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
unsigned int offset;
u8 *byte = buf;
ssize_t ret, bytes_to_recv, len;
const 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(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(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(&dig_port->dp.aux, offset,
(void *)byte, len);
if (ret < 0) {
drm_dbg_kms(&i915->drm, "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 *dig_port,
bool is_repeater, u8 content_type)
{
int ret;
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;
ret = intel_dp_hdcp2_write_msg(dig_port, &stream_type_msg,
sizeof(stream_type_msg));
return ret < 0 ? ret : 0;
}
static
int intel_dp_hdcp2_check_link(struct intel_digital_port *dig_port)
{
u8 rx_status;
int ret;
ret = intel_dp_hdcp2_read_rx_status(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 *dig_port,
bool *capable)
{
u8 rx_caps[3];
int ret;
*capable = false;
ret = drm_dp_dpcd_read(&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,
.read_bstatus = intel_dp_hdcp_read_bstatus,
.repeater_present = intel_dp_hdcp_repeater_present,
.read_ri_prime = intel_dp_hdcp_read_ri_prime,
.read_ksv_ready = intel_dp_hdcp_read_ksv_ready,
.read_ksv_fifo = intel_dp_hdcp_read_ksv_fifo,
.read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
.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,
};
int intel_dp_init_hdcp(struct intel_digital_port *dig_port,
struct intel_connector *intel_connector)
{
struct drm_device *dev = intel_connector->base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_encoder *intel_encoder = &dig_port->base;
enum port port = intel_encoder->port;
struct intel_dp *intel_dp = &dig_port->dp;
if (!is_hdcp_supported(dev_priv, port))
return 0;
if (!intel_dp_is_edp(intel_dp))
return intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim);
return 0;
}