drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Test cases for for the DRM DP MST helpers
   4  */
   5
   6 #define PREFIX_STR "[drm_dp_mst_helper]"
   7
   8 #include <linux/random.h>
   9
  10 #include <drm/drm_dp_mst_helper.h>
  11 #include <drm/drm_print.h>
  12
  13 #include "../drm_dp_mst_topology_internal.h"
  14 #include "test-drm_modeset_common.h"
  15
  16 int igt_dp_mst_calc_pbn_mode(void *ignored)
  17 {
  18         int pbn, i;
  19         const struct {
  20                 int rate;
  21                 int bpp;
  22                 int expected;
  23                 bool dsc;
  24         } test_params[] = {
  25                 { 154000, 30, 689, false },
  26                 { 234000, 30, 1047, false },
  27                 { 297000, 24, 1063, false },
  28                 { 332880, 24, 50, true },
  29                 { 324540, 24, 49, true },
  30         };
  31
  32         for (i = 0; i < ARRAY_SIZE(test_params); i++) {
  33                 pbn = drm_dp_calc_pbn_mode(test_params[i].rate,
  34                                            test_params[i].bpp,
  35                                            test_params[i].dsc);
  36                 FAIL(pbn != test_params[i].expected,
  37                      "Expected PBN %d for clock %d bpp %d, got %d\n",
  38                      test_params[i].expected, test_params[i].rate,
  39                      test_params[i].bpp, pbn);
  40         }
  41
  42         return 0;
  43 }
  44
  45 static bool
  46 sideband_msg_req_equal(const struct drm_dp_sideband_msg_req_body *in,
  47                        const struct drm_dp_sideband_msg_req_body *out)
  48 {
  49         const struct drm_dp_remote_i2c_read_tx *txin, *txout;
  50         int i;
  51
  52         if (in->req_type != out->req_type)
  53                 return false;
  54
  55         switch (in->req_type) {
  56         /*
  57          * Compare struct members manually for request types which can't be
  58          * compared simply using memcmp(). This is because said request types
  59          * contain pointers to other allocated structs
  60          */
  61         case DP_REMOTE_I2C_READ:
  62 #define IN in->u.i2c_read
  63 #define OUT out->u.i2c_read
  64                 if (IN.num_bytes_read != OUT.num_bytes_read ||
  65                     IN.num_transactions != OUT.num_transactions ||
  66                     IN.port_number != OUT.port_number ||
  67                     IN.read_i2c_device_id != OUT.read_i2c_device_id)
  68                         return false;
  69
  70                 for (i = 0; i < IN.num_transactions; i++) {
  71                         txin = &IN.transactions[i];
  72                         txout = &OUT.transactions[i];
  73
  74                         if (txin->i2c_dev_id != txout->i2c_dev_id ||
  75                             txin->no_stop_bit != txout->no_stop_bit ||
  76                             txin->num_bytes != txout->num_bytes ||
  77                             txin->i2c_transaction_delay !=
  78                             txout->i2c_transaction_delay)
  79                                 return false;
  80
  81                         if (memcmp(txin->bytes, txout->bytes,
  82                                    txin->num_bytes) != 0)
  83                                 return false;
  84                 }
  85                 break;
  86 #undef IN
  87 #undef OUT
  88
  89         case DP_REMOTE_DPCD_WRITE:
  90 #define IN in->u.dpcd_write
  91 #define OUT out->u.dpcd_write
  92                 if (IN.dpcd_address != OUT.dpcd_address ||
  93                     IN.num_bytes != OUT.num_bytes ||
  94                     IN.port_number != OUT.port_number)
  95                         return false;
  96
  97                 return memcmp(IN.bytes, OUT.bytes, IN.num_bytes) == 0;
  98 #undef IN
  99 #undef OUT
 100
 101         case DP_REMOTE_I2C_WRITE:
 102 #define IN in->u.i2c_write
 103 #define OUT out->u.i2c_write
 104                 if (IN.port_number != OUT.port_number ||
 105                     IN.write_i2c_device_id != OUT.write_i2c_device_id ||
 106                     IN.num_bytes != OUT.num_bytes)
 107                         return false;
 108
 109                 return memcmp(IN.bytes, OUT.bytes, IN.num_bytes) == 0;
 110 #undef IN
 111 #undef OUT
 112
 113         default:
 114                 return memcmp(in, out, sizeof(*in)) == 0;
 115         }
 116
 117         return true;
 118 }
 119
 120 static bool
 121 sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
 122 {
 123         struct drm_dp_sideband_msg_req_body *out;
 124         struct drm_printer p = drm_err_printer(PREFIX_STR);
 125         struct drm_dp_sideband_msg_tx *txmsg;
 126         int i, ret;
 127         bool result = true;
 128
 129         out = kzalloc(sizeof(*out), GFP_KERNEL);
 130         if (!out)
 131                 return false;
 132
 133         txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
 134         if (!txmsg)
 135                 return false;
 136
 137         drm_dp_encode_sideband_req(in, txmsg);
 138         ret = drm_dp_decode_sideband_req(txmsg, out);
 139         if (ret < 0) {
 140                 drm_printf(&p, "Failed to decode sideband request: %d\n",
 141                            ret);
 142                 result = false;
 143                 goto out;
 144         }
 145
 146         if (!sideband_msg_req_equal(in, out)) {
 147                 drm_printf(&p, "Encode/decode failed, expected:\n");
 148                 drm_dp_dump_sideband_msg_req_body(in, 1, &p);
 149                 drm_printf(&p, "Got:\n");
 150                 drm_dp_dump_sideband_msg_req_body(out, 1, &p);
 151                 result = false;
 152                 goto out;
 153         }
 154
 155         switch (in->req_type) {
 156         case DP_REMOTE_DPCD_WRITE:
 157                 kfree(out->u.dpcd_write.bytes);
 158                 break;
 159         case DP_REMOTE_I2C_READ:
 160                 for (i = 0; i < out->u.i2c_read.num_transactions; i++)
 161                         kfree(out->u.i2c_read.transactions[i].bytes);
 162                 break;
 163         case DP_REMOTE_I2C_WRITE:
 164                 kfree(out->u.i2c_write.bytes);
 165                 break;
 166         }
 167
 168         /* Clear everything but the req_type for the input */
 169         memset(&in->u, 0, sizeof(in->u));
 170
 171 out:
 172         kfree(out);
 173         kfree(txmsg);
 174         return result;
 175 }
 176
 177 int igt_dp_mst_sideband_msg_req_decode(void *unused)
 178 {
 179         struct drm_dp_sideband_msg_req_body in = { 0 };
 180         u8 data[] = { 0xff, 0x0, 0xdd };
 181         int i;
 182
 183 #define DO_TEST() FAIL_ON(!sideband_msg_req_encode_decode(&in))
 184
 185         in.req_type = DP_ENUM_PATH_RESOURCES;
 186         in.u.port_num.port_number = 5;
 187         DO_TEST();
 188
 189         in.req_type = DP_POWER_UP_PHY;
 190         in.u.port_num.port_number = 5;
 191         DO_TEST();
 192
 193         in.req_type = DP_POWER_DOWN_PHY;
 194         in.u.port_num.port_number = 5;
 195         DO_TEST();
 196
 197         in.req_type = DP_ALLOCATE_PAYLOAD;
 198         in.u.allocate_payload.number_sdp_streams = 3;
 199         for (i = 0; i < in.u.allocate_payload.number_sdp_streams; i++)
 200                 in.u.allocate_payload.sdp_stream_sink[i] = i + 1;
 201         DO_TEST();
 202         in.u.allocate_payload.port_number = 0xf;
 203         DO_TEST();
 204         in.u.allocate_payload.vcpi = 0x7f;
 205         DO_TEST();
 206         in.u.allocate_payload.pbn = U16_MAX;
 207         DO_TEST();
 208
 209         in.req_type = DP_QUERY_PAYLOAD;
 210         in.u.query_payload.port_number = 0xf;
 211         DO_TEST();
 212         in.u.query_payload.vcpi = 0x7f;
 213         DO_TEST();
 214
 215         in.req_type = DP_REMOTE_DPCD_READ;
 216         in.u.dpcd_read.port_number = 0xf;
 217         DO_TEST();
 218         in.u.dpcd_read.dpcd_address = 0xfedcb;
 219         DO_TEST();
 220         in.u.dpcd_read.num_bytes = U8_MAX;
 221         DO_TEST();
 222
 223         in.req_type = DP_REMOTE_DPCD_WRITE;
 224         in.u.dpcd_write.port_number = 0xf;
 225         DO_TEST();
 226         in.u.dpcd_write.dpcd_address = 0xfedcb;
 227         DO_TEST();
 228         in.u.dpcd_write.num_bytes = ARRAY_SIZE(data);
 229         in.u.dpcd_write.bytes = data;
 230         DO_TEST();
 231
 232         in.req_type = DP_REMOTE_I2C_READ;
 233         in.u.i2c_read.port_number = 0xf;
 234         DO_TEST();
 235         in.u.i2c_read.read_i2c_device_id = 0x7f;
 236         DO_TEST();
 237         in.u.i2c_read.num_transactions = 3;
 238         in.u.i2c_read.num_bytes_read = ARRAY_SIZE(data) * 3;
 239         for (i = 0; i < in.u.i2c_read.num_transactions; i++) {
 240                 in.u.i2c_read.transactions[i].bytes = data;
 241                 in.u.i2c_read.transactions[i].num_bytes = ARRAY_SIZE(data);
 242                 in.u.i2c_read.transactions[i].i2c_dev_id = 0x7f & ~i;
 243                 in.u.i2c_read.transactions[i].i2c_transaction_delay = 0xf & ~i;
 244         }
 245         DO_TEST();
 246
 247         in.req_type = DP_REMOTE_I2C_WRITE;
 248         in.u.i2c_write.port_number = 0xf;
 249         DO_TEST();
 250         in.u.i2c_write.write_i2c_device_id = 0x7f;
 251         DO_TEST();
 252         in.u.i2c_write.num_bytes = ARRAY_SIZE(data);
 253         in.u.i2c_write.bytes = data;
 254         DO_TEST();
 255
 256         in.req_type = DP_QUERY_STREAM_ENC_STATUS;
 257         in.u.enc_status.stream_id = 1;
 258         DO_TEST();
 259         get_random_bytes(in.u.enc_status.client_id,
 260                          sizeof(in.u.enc_status.client_id));
 261         DO_TEST();
 262         in.u.enc_status.stream_event = 3;
 263         DO_TEST();
 264         in.u.enc_status.valid_stream_event = 0;
 265         DO_TEST();
 266         in.u.enc_status.stream_behavior = 3;
 267         DO_TEST();
 268         in.u.enc_status.valid_stream_behavior = 1;
 269         DO_TEST();
 270
 271 #undef DO_TEST
 272         return 0;
 273 }