drivers/gpu/drm/msm/dp/dp_debug.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #define pr_fmt(fmt)"[drm-dp] %s: " fmt, __func__
   7
   8 #include <linux/debugfs.h>
   9 #include <drm/drm_connector.h>
  10 #include <drm/drm_file.h>
  11
  12 #include "dp_parser.h"
  13 #include "dp_catalog.h"
  14 #include "dp_aux.h"
  15 #include "dp_ctrl.h"
  16 #include "dp_debug.h"
  17 #include "dp_display.h"
  18
  19 #define DEBUG_NAME "msm_dp"
  20
  21 struct dp_debug_private {
  22         struct dentry *root;
  23
  24         struct dp_link *link;
  25         struct dp_panel *panel;
  26         struct drm_connector *connector;
  27         struct device *dev;
  28         struct drm_device *drm_dev;
  29
  30         struct dp_debug dp_debug;
  31 };
  32
  33 static int dp_debug_show(struct seq_file *seq, void *p)
  34 {
  35         struct dp_debug_private *debug = seq->private;
  36         u64 lclk = 0;
  37         u32 link_params_rate;
  38         const struct drm_display_mode *drm_mode;
  39
  40         if (!debug)
  41                 return -ENODEV;
  42
  43         drm_mode = &debug->panel->dp_mode.drm_mode;
  44
  45         seq_printf(seq, "\tname = %s\n", DEBUG_NAME);
  46         seq_printf(seq, "\tdrm_dp_link\n\t\trate = %u\n",
  47                         debug->panel->link_info.rate);
  48         seq_printf(seq, "\t\tnum_lanes = %u\n",
  49                         debug->panel->link_info.num_lanes);
  50         seq_printf(seq, "\t\tcapabilities = %lu\n",
  51                         debug->panel->link_info.capabilities);
  52         seq_printf(seq, "\tdp_panel_info:\n\t\tactive = %dx%d\n",
  53                         drm_mode->hdisplay,
  54                         drm_mode->vdisplay);
  55         seq_printf(seq, "\t\tback_porch = %dx%d\n",
  56                         drm_mode->htotal - drm_mode->hsync_end,
  57                         drm_mode->vtotal - drm_mode->vsync_end);
  58         seq_printf(seq, "\t\tfront_porch = %dx%d\n",
  59                         drm_mode->hsync_start - drm_mode->hdisplay,
  60                         drm_mode->vsync_start - drm_mode->vdisplay);
  61         seq_printf(seq, "\t\tsync_width = %dx%d\n",
  62                         drm_mode->hsync_end - drm_mode->hsync_start,
  63                         drm_mode->vsync_end - drm_mode->vsync_start);
  64         seq_printf(seq, "\t\tactive_low = %dx%d\n",
  65                         debug->panel->dp_mode.h_active_low,
  66                         debug->panel->dp_mode.v_active_low);
  67         seq_printf(seq, "\t\th_skew = %d\n",
  68                         drm_mode->hskew);
  69         seq_printf(seq, "\t\trefresh rate = %d\n",
  70                         drm_mode_vrefresh(drm_mode));
  71         seq_printf(seq, "\t\tpixel clock khz = %d\n",
  72                         drm_mode->clock);
  73         seq_printf(seq, "\t\tbpp = %d\n",
  74                         debug->panel->dp_mode.bpp);
  75
  76         /* Link Information */
  77         seq_printf(seq, "\tdp_link:\n\t\ttest_requested = %d\n",
  78                         debug->link->sink_request);
  79         seq_printf(seq, "\t\tnum_lanes = %d\n",
  80                         debug->link->link_params.num_lanes);
  81         link_params_rate = debug->link->link_params.rate;
  82         seq_printf(seq, "\t\tbw_code = %d\n",
  83                         drm_dp_link_rate_to_bw_code(link_params_rate));
  84         lclk = debug->link->link_params.rate * 1000;
  85         seq_printf(seq, "\t\tlclk = %lld\n", lclk);
  86         seq_printf(seq, "\t\tv_level = %d\n",
  87                         debug->link->phy_params.v_level);
  88         seq_printf(seq, "\t\tp_level = %d\n",
  89                         debug->link->phy_params.p_level);
  90
  91         return 0;
  92 }
  93 DEFINE_SHOW_ATTRIBUTE(dp_debug);
  94
  95 static int dp_test_data_show(struct seq_file *m, void *data)
  96 {
  97         const struct dp_debug_private *debug = m->private;
  98         const struct drm_connector *connector = debug->connector;
  99         u32 bpc;
 100
 101         if (connector->status == connector_status_connected) {
 102                 bpc = debug->link->test_video.test_bit_depth;
 103                 seq_printf(m, "hdisplay: %d\n",
 104                                 debug->link->test_video.test_h_width);
 105                 seq_printf(m, "vdisplay: %d\n",
 106                                 debug->link->test_video.test_v_height);
 107                 seq_printf(m, "bpc: %u\n",
 108                                 dp_link_bit_depth_to_bpc(bpc));
 109         } else {
 110                 seq_puts(m, "0");
 111         }
 112
 113         return 0;
 114 }
 115 DEFINE_SHOW_ATTRIBUTE(dp_test_data);
 116
 117 static int dp_test_type_show(struct seq_file *m, void *data)
 118 {
 119         const struct dp_debug_private *debug = m->private;
 120         const struct drm_connector *connector = debug->connector;
 121
 122         if (connector->status == connector_status_connected)
 123                 seq_printf(m, "%02x", DP_TEST_LINK_VIDEO_PATTERN);
 124         else
 125                 seq_puts(m, "0");
 126
 127         return 0;
 128 }
 129 DEFINE_SHOW_ATTRIBUTE(dp_test_type);
 130
 131 static ssize_t dp_test_active_write(struct file *file,
 132                 const char __user *ubuf,
 133                 size_t len, loff_t *offp)
 134 {
 135         char *input_buffer;
 136         int status = 0;
 137         const struct dp_debug_private *debug;
 138         const struct drm_connector *connector;
 139         int val = 0;
 140
 141         debug = ((struct seq_file *)file->private_data)->private;
 142         connector = debug->connector;
 143
 144         if (len == 0)
 145                 return 0;
 146
 147         input_buffer = memdup_user_nul(ubuf, len);
 148         if (IS_ERR(input_buffer))
 149                 return PTR_ERR(input_buffer);
 150
 151         DRM_DEBUG_DRIVER("Copied %d bytes from user\n", (unsigned int)len);
 152
 153         if (connector->status == connector_status_connected) {
 154                 status = kstrtoint(input_buffer, 10, &val);
 155                 if (status < 0) {
 156                         kfree(input_buffer);
 157                         return status;
 158                 }
 159                 DRM_DEBUG_DRIVER("Got %d for test active\n", val);
 160                 /* To prevent erroneous activation of the compliance
 161                  * testing code, only accept an actual value of 1 here
 162                  */
 163                 if (val == 1)
 164                         debug->panel->video_test = true;
 165                 else
 166                         debug->panel->video_test = false;
 167         }
 168         kfree(input_buffer);
 169
 170         *offp += len;
 171         return len;
 172 }
 173
 174 static int dp_test_active_show(struct seq_file *m, void *data)
 175 {
 176         struct dp_debug_private *debug = m->private;
 177         struct drm_connector *connector = debug->connector;
 178
 179         if (connector->status == connector_status_connected) {
 180                 if (debug->panel->video_test)
 181                         seq_puts(m, "1");
 182                 else
 183                         seq_puts(m, "0");
 184         } else {
 185                 seq_puts(m, "0");
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int dp_test_active_open(struct inode *inode,
 192                 struct file *file)
 193 {
 194         return single_open(file, dp_test_active_show,
 195                         inode->i_private);
 196 }
 197
 198 static const struct file_operations test_active_fops = {
 199         .owner = THIS_MODULE,
 200         .open = dp_test_active_open,
 201         .read = seq_read,
 202         .llseek = seq_lseek,
 203         .release = single_release,
 204         .write = dp_test_active_write
 205 };
 206
 207 static void dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)
 208 {
 209         char path[64];
 210         struct dp_debug_private *debug = container_of(dp_debug,
 211                         struct dp_debug_private, dp_debug);
 212
 213         snprintf(path, sizeof(path), "msm_dp-%s", debug->connector->name);
 214
 215         debug->root = debugfs_create_dir(path, minor->debugfs_root);
 216
 217         debugfs_create_file("dp_debug", 0444, debug->root,
 218                         debug, &dp_debug_fops);
 219
 220         debugfs_create_file("msm_dp_test_active", 0444,
 221                         debug->root,
 222                         debug, &test_active_fops);
 223
 224         debugfs_create_file("msm_dp_test_data", 0444,
 225                         debug->root,
 226                         debug, &dp_test_data_fops);
 227
 228         debugfs_create_file("msm_dp_test_type", 0444,
 229                         debug->root,
 230                         debug, &dp_test_type_fops);
 231 }
 232
 233 struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,
 234                 struct dp_link *link,
 235                 struct drm_connector *connector, struct drm_minor *minor)
 236 {
 237         struct dp_debug_private *debug;
 238         struct dp_debug *dp_debug;
 239         int rc;
 240
 241         if (!dev || !panel || !link) {
 242                 DRM_ERROR("invalid input\n");
 243                 rc = -EINVAL;
 244                 goto error;
 245         }
 246
 247         debug = devm_kzalloc(dev, sizeof(*debug), GFP_KERNEL);
 248         if (!debug) {
 249                 rc = -ENOMEM;
 250                 goto error;
 251         }
 252
 253         debug->dp_debug.debug_en = false;
 254         debug->link = link;
 255         debug->panel = panel;
 256         debug->dev = dev;
 257         debug->drm_dev = minor->dev;
 258         debug->connector = connector;
 259
 260         dp_debug = &debug->dp_debug;
 261         dp_debug->vdisplay = 0;
 262         dp_debug->hdisplay = 0;
 263         dp_debug->vrefresh = 0;
 264
 265         dp_debug_init(dp_debug, minor);
 266
 267         return dp_debug;
 268  error:
 269         return ERR_PTR(rc);
 270 }
 271
 272 static int dp_debug_deinit(struct dp_debug *dp_debug)
 273 {
 274         struct dp_debug_private *debug;
 275
 276         if (!dp_debug)
 277                 return -EINVAL;
 278
 279         debug = container_of(dp_debug, struct dp_debug_private, dp_debug);
 280
 281         debugfs_remove_recursive(debug->root);
 282
 283         return 0;
 284 }
 285
 286 void dp_debug_put(struct dp_debug *dp_debug)
 287 {
 288         struct dp_debug_private *debug;
 289
 290         if (!dp_debug)
 291                 return;
 292
 293         debug = container_of(dp_debug, struct dp_debug_private, dp_debug);
 294
 295         dp_debug_deinit(dp_debug);
 296
 297         devm_kfree(debug->dev, debug);
 298 }