// SPDX-License-Identifier: GPL-2.0-only
/*
* Test cases for the DRM DP MST helpers
*
* Copyright (c) 2022 Maíra Canal <[email protected]>
*/
#include <kunit/test.h>
#include <drm/display/drm_dp_mst_helper.h>
#include <drm/drm_print.h>
#include "../display/drm_dp_mst_topology_internal.h"
struct drm_dp_mst_calc_pbn_mode_test {
const int clock;
const int bpp;
const bool dsc;
const int expected;
};
static const struct drm_dp_mst_calc_pbn_mode_test drm_dp_mst_calc_pbn_mode_cases[] = {
{
.clock = 154000,
.bpp = 30,
.dsc = false,
.expected = 689
},
{
.clock = 234000,
.bpp = 30,
.dsc = false,
.expected = 1047
},
{
.clock = 297000,
.bpp = 24,
.dsc = false,
.expected = 1063
},
{
.clock = 332880,
.bpp = 24,
.dsc = true,
.expected = 1191
},
{
.clock = 324540,
.bpp = 24,
.dsc = true,
.expected = 1161
},
};
static void drm_test_dp_mst_calc_pbn_mode(struct kunit *test)
{
const struct drm_dp_mst_calc_pbn_mode_test *params = test->param_value;
KUNIT_EXPECT_EQ(test, drm_dp_calc_pbn_mode(params->clock, params->bpp << 4),
params->expected);
}
static void dp_mst_calc_pbn_mode_desc(const struct drm_dp_mst_calc_pbn_mode_test *t, char *desc)
{
sprintf(desc, "Clock %d BPP %d DSC %s", t->clock, t->bpp, t->dsc ? "enabled" : "disabled");
}
KUNIT_ARRAY_PARAM(drm_dp_mst_calc_pbn_mode, drm_dp_mst_calc_pbn_mode_cases,
dp_mst_calc_pbn_mode_desc);
struct drm_dp_mst_calc_pbn_div_test {
int link_rate;
int lane_count;
fixed20_12 expected;
};
#define fp_init(__int, __frac) { \
.full = (__int) * (1 << 12) + \
(__frac) * (1 << 12) / 100000 \
}
static const struct drm_dp_mst_calc_pbn_div_test drm_dp_mst_calc_pbn_div_dp1_4_cases[] = {
/*
* UHBR rates (DP Standard v2.1 2.7.6.3, specifying the rounded to
* closest value to 2 decimal places):
* .expected = .link_rate * .lane_count * 0.9671 / 8 / 54 / 100
* DP1.4 rates (DP Standard v2.1 2.6.4.2):
* .expected = .link_rate * .lane_count * 0.8000 / 8 / 54 / 100
*
* truncated to 5 decimal places.
*/
{
.link_rate = 2000000,
.lane_count = 4,
.expected = fp_init(179, 9259), /* 179.09259 */
},
{
.link_rate = 2000000,
.lane_count = 2,
.expected = fp_init(89, 54629),
},
{
.link_rate = 2000000,
.lane_count = 1,
.expected = fp_init(44, 77314),
},
{
.link_rate = 1350000,
.lane_count = 4,
.expected = fp_init(120, 88750),
},
{
.link_rate = 1350000,
.lane_count = 2,
.expected = fp_init(60, 44375),
},
{
.link_rate = 1350000,
.lane_count = 1,
.expected = fp_init(30, 22187),
},
{
.link_rate = 1000000,
.lane_count = 4,
.expected = fp_init(89, 54629),
},
{
.link_rate = 1000000,
.lane_count = 2,
.expected = fp_init(44, 77314),
},
{
.link_rate = 1000000,
.lane_count = 1,
.expected = fp_init(22, 38657),
},
{
.link_rate = 810000,
.lane_count = 4,
.expected = fp_init(60, 0),
},
{
.link_rate = 810000,
.lane_count = 2,
.expected = fp_init(30, 0),
},
{
.link_rate = 810000,
.lane_count = 1,
.expected = fp_init(15, 0),
},
{
.link_rate = 540000,
.lane_count = 4,
.expected = fp_init(40, 0),
},
{
.link_rate = 540000,
.lane_count = 2,
.expected = fp_init(20, 0),
},
{
.link_rate = 540000,
.lane_count = 1,
.expected = fp_init(10, 0),
},
{
.link_rate = 270000,
.lane_count = 4,
.expected = fp_init(20, 0),
},
{
.link_rate = 270000,
.lane_count = 2,
.expected = fp_init(10, 0),
},
{
.link_rate = 270000,
.lane_count = 1,
.expected = fp_init(5, 0),
},
{
.link_rate = 162000,
.lane_count = 4,
.expected = fp_init(12, 0),
},
{
.link_rate = 162000,
.lane_count = 2,
.expected = fp_init(6, 0),
},
{
.link_rate = 162000,
.lane_count = 1,
.expected = fp_init(3, 0),
},
};
static void drm_test_dp_mst_calc_pbn_div(struct kunit *test)
{
const struct drm_dp_mst_calc_pbn_div_test *params = test->param_value;
/* mgr->dev is only needed by drm_dbg_kms(), but it's not called for the test cases. */
struct drm_dp_mst_topology_mgr *mgr = test->priv;
KUNIT_EXPECT_EQ(test, drm_dp_get_vc_payload_bw(mgr, params->link_rate, params->lane_count).full,
params->expected.full);
}
static void dp_mst_calc_pbn_div_desc(const struct drm_dp_mst_calc_pbn_div_test *t, char *desc)
{
sprintf(desc, "Link rate %d lane count %d", t->link_rate, t->lane_count);
}
KUNIT_ARRAY_PARAM(drm_dp_mst_calc_pbn_div, drm_dp_mst_calc_pbn_div_dp1_4_cases,
dp_mst_calc_pbn_div_desc);
static u8 data[] = { 0xff, 0x00, 0xdd };
struct drm_dp_mst_sideband_msg_req_test {
const char *desc;
const struct drm_dp_sideband_msg_req_body in;
};
static const struct drm_dp_mst_sideband_msg_req_test drm_dp_mst_sideband_msg_req_cases[] = {
{
.desc = "DP_ENUM_PATH_RESOURCES with port number",
.in = {
.req_type = DP_ENUM_PATH_RESOURCES,
.u.port_num.port_number = 5,
},
},
{
.desc = "DP_POWER_UP_PHY with port number",
.in = {
.req_type = DP_POWER_UP_PHY,
.u.port_num.port_number = 5,
},
},
{
.desc = "DP_POWER_DOWN_PHY with port number",
.in = {
.req_type = DP_POWER_DOWN_PHY,
.u.port_num.port_number = 5,
},
},
{
.desc = "DP_ALLOCATE_PAYLOAD with SDP stream sinks",
.in = {
.req_type = DP_ALLOCATE_PAYLOAD,
.u.allocate_payload.number_sdp_streams = 3,
.u.allocate_payload.sdp_stream_sink = { 1, 2, 3 },
},
},
{
.desc = "DP_ALLOCATE_PAYLOAD with port number",
.in = {
.req_type = DP_ALLOCATE_PAYLOAD,
.u.allocate_payload.port_number = 0xf,
},
},
{
.desc = "DP_ALLOCATE_PAYLOAD with VCPI",
.in = {
.req_type = DP_ALLOCATE_PAYLOAD,
.u.allocate_payload.vcpi = 0x7f,
},
},
{
.desc = "DP_ALLOCATE_PAYLOAD with PBN",
.in = {
.req_type = DP_ALLOCATE_PAYLOAD,
.u.allocate_payload.pbn = U16_MAX,
},
},
{
.desc = "DP_QUERY_PAYLOAD with port number",
.in = {
.req_type = DP_QUERY_PAYLOAD,
.u.query_payload.port_number = 0xf,
},
},
{
.desc = "DP_QUERY_PAYLOAD with VCPI",
.in = {
.req_type = DP_QUERY_PAYLOAD,
.u.query_payload.vcpi = 0x7f,
},
},
{
.desc = "DP_REMOTE_DPCD_READ with port number",
.in = {
.req_type = DP_REMOTE_DPCD_READ,
.u.dpcd_read.port_number = 0xf,
},
},
{
.desc = "DP_REMOTE_DPCD_READ with DPCD address",
.in = {
.req_type = DP_REMOTE_DPCD_READ,
.u.dpcd_read.dpcd_address = 0xfedcb,
},
},
{
.desc = "DP_REMOTE_DPCD_READ with max number of bytes",
.in = {
.req_type = DP_REMOTE_DPCD_READ,
.u.dpcd_read.num_bytes = U8_MAX,
},
},
{
.desc = "DP_REMOTE_DPCD_WRITE with port number",
.in = {
.req_type = DP_REMOTE_DPCD_WRITE,
.u.dpcd_write.port_number = 0xf,
},
},
{
.desc = "DP_REMOTE_DPCD_WRITE with DPCD address",
.in = {
.req_type = DP_REMOTE_DPCD_WRITE,
.u.dpcd_write.dpcd_address = 0xfedcb,
},
},
{
.desc = "DP_REMOTE_DPCD_WRITE with data array",
.in = {
.req_type = DP_REMOTE_DPCD_WRITE,
.u.dpcd_write.num_bytes = ARRAY_SIZE(data),
.u.dpcd_write.bytes = data,
},
},
{
.desc = "DP_REMOTE_I2C_READ with port number",
.in = {
.req_type = DP_REMOTE_I2C_READ,
.u.i2c_read.port_number = 0xf,
},
},
{
.desc = "DP_REMOTE_I2C_READ with I2C device ID",
.in = {
.req_type = DP_REMOTE_I2C_READ,
.u.i2c_read.read_i2c_device_id = 0x7f,
},
},
{
.desc = "DP_REMOTE_I2C_READ with transactions array",
.in = {
.req_type = DP_REMOTE_I2C_READ,
.u.i2c_read.num_transactions = 3,
.u.i2c_read.num_bytes_read = ARRAY_SIZE(data) * 3,
.u.i2c_read.transactions = {
{ .bytes = data, .num_bytes = ARRAY_SIZE(data), .i2c_dev_id = 0x7f,
.i2c_transaction_delay = 0xf, },
{ .bytes = data, .num_bytes = ARRAY_SIZE(data), .i2c_dev_id = 0x7e,
.i2c_transaction_delay = 0xe, },
{ .bytes = data, .num_bytes = ARRAY_SIZE(data), .i2c_dev_id = 0x7d,
.i2c_transaction_delay = 0xd, },
},
},
},
{
.desc = "DP_REMOTE_I2C_WRITE with port number",
.in = {
.req_type = DP_REMOTE_I2C_WRITE,
.u.i2c_write.port_number = 0xf,
},
},
{
.desc = "DP_REMOTE_I2C_WRITE with I2C device ID",
.in = {
.req_type = DP_REMOTE_I2C_WRITE,
.u.i2c_write.write_i2c_device_id = 0x7f,
},
},
{
.desc = "DP_REMOTE_I2C_WRITE with data array",
.in = {
.req_type = DP_REMOTE_I2C_WRITE,
.u.i2c_write.num_bytes = ARRAY_SIZE(data),
.u.i2c_write.bytes = data,
},
},
{
.desc = "DP_QUERY_STREAM_ENC_STATUS with stream ID",
.in = {
.req_type = DP_QUERY_STREAM_ENC_STATUS,
.u.enc_status.stream_id = 1,
},
},
{
.desc = "DP_QUERY_STREAM_ENC_STATUS with client ID",
.in = {
.req_type = DP_QUERY_STREAM_ENC_STATUS,
.u.enc_status.client_id = { 0x4f, 0x7f, 0xb4, 0x00, 0x8c, 0x0d, 0x67 },
},
},
{
.desc = "DP_QUERY_STREAM_ENC_STATUS with stream event",
.in = {
.req_type = DP_QUERY_STREAM_ENC_STATUS,
.u.enc_status.stream_event = 3,
},
},
{
.desc = "DP_QUERY_STREAM_ENC_STATUS with valid stream event",
.in = {
.req_type = DP_QUERY_STREAM_ENC_STATUS,
.u.enc_status.valid_stream_event = 0,
},
},
{
.desc = "DP_QUERY_STREAM_ENC_STATUS with stream behavior",
.in = {
.req_type = DP_QUERY_STREAM_ENC_STATUS,
.u.enc_status.stream_behavior = 3,
},
},
{
.desc = "DP_QUERY_STREAM_ENC_STATUS with a valid stream behavior",
.in = {
.req_type = DP_QUERY_STREAM_ENC_STATUS,
.u.enc_status.valid_stream_behavior = 1,
}
},
};
static bool
sideband_msg_req_equal(const struct drm_dp_sideband_msg_req_body *in,
const struct drm_dp_sideband_msg_req_body *out)
{
const struct drm_dp_remote_i2c_read_tx *txin, *txout;
int i;
if (in->req_type != out->req_type)
return false;
switch (in->req_type) {
/*
* Compare struct members manually for request types which can't be
* compared simply using memcmp(). This is because said request types
* contain pointers to other allocated structs
*/
case DP_REMOTE_I2C_READ:
#define IN in->u.i2c_read
#define OUT out->u.i2c_read
if (IN.num_bytes_read != OUT.num_bytes_read ||
IN.num_transactions != OUT.num_transactions ||
IN.port_number != OUT.port_number ||
IN.read_i2c_device_id != OUT.read_i2c_device_id)
return false;
for (i = 0; i < IN.num_transactions; i++) {
txin = &IN.transactions[i];
txout = &OUT.transactions[i];
if (txin->i2c_dev_id != txout->i2c_dev_id ||
txin->no_stop_bit != txout->no_stop_bit ||
txin->num_bytes != txout->num_bytes ||
txin->i2c_transaction_delay !=
txout->i2c_transaction_delay)
return false;
if (memcmp(txin->bytes, txout->bytes,
txin->num_bytes) != 0)
return false;
}
break;
#undef IN
#undef OUT
case DP_REMOTE_DPCD_WRITE:
#define IN in->u.dpcd_write
#define OUT out->u.dpcd_write
if (IN.dpcd_address != OUT.dpcd_address ||
IN.num_bytes != OUT.num_bytes ||
IN.port_number != OUT.port_number)
return false;
return memcmp(IN.bytes, OUT.bytes, IN.num_bytes) == 0;
#undef IN
#undef OUT
case DP_REMOTE_I2C_WRITE:
#define IN in->u.i2c_write
#define OUT out->u.i2c_write
if (IN.port_number != OUT.port_number ||
IN.write_i2c_device_id != OUT.write_i2c_device_id ||
IN.num_bytes != OUT.num_bytes)
return false;
return memcmp(IN.bytes, OUT.bytes, IN.num_bytes) == 0;
#undef IN
#undef OUT
default:
return memcmp(in, out, sizeof(*in)) == 0;
}
return true;
}
static void drm_test_dp_mst_msg_printf(struct drm_printer *p, struct va_format *vaf)
{
struct kunit *test = p->arg;
kunit_err(test, "%pV", vaf);
}
static void drm_test_dp_mst_sideband_msg_req_decode(struct kunit *test)
{
const struct drm_dp_mst_sideband_msg_req_test *params = test->param_value;
const struct drm_dp_sideband_msg_req_body *in = ¶ms->in;
struct drm_dp_sideband_msg_req_body *out;
struct drm_dp_sideband_msg_tx *txmsg;
struct drm_printer p = {
.printfn = drm_test_dp_mst_msg_printf,
.arg = test
};
int i;
out = kunit_kzalloc(test, sizeof(*out), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, out);
txmsg = kunit_kzalloc(test, sizeof(*txmsg), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, txmsg);
drm_dp_encode_sideband_req(in, txmsg);
KUNIT_EXPECT_GE_MSG(test, drm_dp_decode_sideband_req(txmsg, out), 0,
"Failed to decode sideband request");
if (!sideband_msg_req_equal(in, out)) {
KUNIT_FAIL(test, "Encode/decode failed");
kunit_err(test, "Expected:");
drm_dp_dump_sideband_msg_req_body(in, 1, &p);
kunit_err(test, "Got:");
drm_dp_dump_sideband_msg_req_body(out, 1, &p);
}
switch (in->req_type) {
case DP_REMOTE_DPCD_WRITE:
kfree(out->u.dpcd_write.bytes);
break;
case DP_REMOTE_I2C_READ:
for (i = 0; i < out->u.i2c_read.num_transactions; i++)
kfree(out->u.i2c_read.transactions[i].bytes);
break;
case DP_REMOTE_I2C_WRITE:
kfree(out->u.i2c_write.bytes);
break;
}
}
static void
drm_dp_mst_sideband_msg_req_desc(const struct drm_dp_mst_sideband_msg_req_test *t, char *desc)
{
strcpy(desc, t->desc);
}
KUNIT_ARRAY_PARAM(drm_dp_mst_sideband_msg_req, drm_dp_mst_sideband_msg_req_cases,
drm_dp_mst_sideband_msg_req_desc);
static struct kunit_case drm_dp_mst_helper_tests[] = {
KUNIT_CASE_PARAM(drm_test_dp_mst_calc_pbn_mode, drm_dp_mst_calc_pbn_mode_gen_params),
KUNIT_CASE_PARAM(drm_test_dp_mst_calc_pbn_div, drm_dp_mst_calc_pbn_div_gen_params),
KUNIT_CASE_PARAM(drm_test_dp_mst_sideband_msg_req_decode,
drm_dp_mst_sideband_msg_req_gen_params),
{ }
};
static int drm_dp_mst_helper_tests_init(struct kunit *test)
{
struct drm_dp_mst_topology_mgr *mgr;
mgr = kunit_kzalloc(test, sizeof(*mgr), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, mgr);
test->priv = mgr;
return 0;
}
static struct kunit_suite drm_dp_mst_helper_test_suite = {
.name = "drm_dp_mst_helper",
.init = drm_dp_mst_helper_tests_init,
.test_cases = drm_dp_mst_helper_tests,
};
kunit_test_suite(drm_dp_mst_helper_test_suite);
MODULE_DESCRIPTION("Test cases for the DRM DP MST helpers");
MODULE_LICENSE("GPL");
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