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drm/dp_mst: Add kunit tests for drm_dp_get_vc_payload_bw()

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Add kunit test cases for drm_dp_get_vc_payload_bw() with all the DP1.4
and UHBR link configurations.

v2:
- List test cases in decreasing rate,lane count order matching the
  corresponding DP Standard tables. (Ville)
- Add references to the DP Standard tables.
v3:
- Sort the testcases properly.
v4:
- Avoid 'stack frame size x exceeds limit y in
  drm_test_dp_mst_calc_pbn_div()' compiler warn. (LKP)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Cc: kernel test robot <lkp@intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> (v3)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231120125256.2433782-1-imre.deak@intel.com
This commit is contained in:
Imre Deak
2023-11-20 14:52:56 +02:00
parent d389989ed5
commit 94c80946ee
1 changed files with 160 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

160
drivers/gpu/drm/tests/drm_dp_mst_helper_test.c
View File

@@ -68,6 +68,152 @@ static void dp_mst_calc_pbn_mode_desc(const struct drm_dp_mst_calc_pbn_mode_test
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 {
@@ -416,13 +562,27 @@ KUNIT_ARRAY_PARAM(drm_dp_mst_sideband_msg_req, drm_dp_mst_sideband_msg_req_cases
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,
};