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_usbpd *usbpd;
  25         struct dp_link *link;
  26         struct dp_panel *panel;
  27         struct drm_connector *connector;
  28         struct device *dev;
  29         struct drm_device *drm_dev;
  30
  31         struct dp_debug dp_debug;
  32 };
  33
  34 static int dp_debug_show(struct seq_file *seq, void *p)
  35 {
  36         struct dp_debug_private *debug = seq->private;
  37         u64 lclk = 0;
  38         u32 link_params_rate;
  39         const struct drm_display_mode *drm_mode;
  40
  41         if (!debug)
  42                 return -ENODEV;
  43
  44         drm_mode = &debug->panel->dp_mode.drm_mode;
  45
  46         seq_printf(seq, "\tname = %s\n", DEBUG_NAME);
  47         seq_printf(seq, "\tdrm_dp_link\n\t\trate = %u\n",
  48                         debug->panel->link_info.rate);
  49         seq_printf(seq, "\t\tnum_lanes = %u\n",
  50                         debug->panel->link_info.num_lanes);
  51         seq_printf(seq, "\t\tcapabilities = %lu\n",
  52                         debug->panel->link_info.capabilities);
  53         seq_printf(seq, "\tdp_panel_info:\n\t\tactive = %dx%d\n",
  54                         drm_mode->hdisplay,
  55                         drm_mode->vdisplay);
  56         seq_printf(seq, "\t\tback_porch = %dx%d\n",
  57                         drm_mode->htotal - drm_mode->hsync_end,
  58                         drm_mode->vtotal - drm_mode->vsync_end);
  59         seq_printf(seq, "\t\tfront_porch = %dx%d\n",
  60                         drm_mode->hsync_start - drm_mode->hdisplay,
  61                         drm_mode->vsync_start - drm_mode->vdisplay);
  62         seq_printf(seq, "\t\tsync_width = %dx%d\n",
  63                         drm_mode->hsync_end - drm_mode->hsync_start,
  64                         drm_mode->vsync_end - drm_mode->vsync_start);
  65         seq_printf(seq, "\t\tactive_low = %dx%d\n",
  66                         debug->panel->dp_mode.h_active_low,
  67                         debug->panel->dp_mode.v_active_low);
  68         seq_printf(seq, "\t\th_skew = %d\n",
  69                         drm_mode->hskew);
  70         seq_printf(seq, "\t\trefresh rate = %d\n",
  71                         drm_mode_vrefresh(drm_mode));
  72         seq_printf(seq, "\t\tpixel clock khz = %d\n",
  73                         drm_mode->clock);
  74         seq_printf(seq, "\t\tbpp = %d\n",
  75                         debug->panel->dp_mode.bpp);
  76
  77         /* Link Information */
  78         seq_printf(seq, "\tdp_link:\n\t\ttest_requested = %d\n",
  79                         debug->link->sink_request);
  80         seq_printf(seq, "\t\tnum_lanes = %d\n",
  81                         debug->link->link_params.num_lanes);
  82         link_params_rate = debug->link->link_params.rate;
  83         seq_printf(seq, "\t\tbw_code = %d\n",
  84                         drm_dp_link_rate_to_bw_code(link_params_rate));
  85         lclk = debug->link->link_params.rate * 1000;
  86         seq_printf(seq, "\t\tlclk = %lld\n", lclk);
  87         seq_printf(seq, "\t\tv_level = %d\n",
  88                         debug->link->phy_params.v_level);
  89         seq_printf(seq, "\t\tp_level = %d\n",
  90                         debug->link->phy_params.p_level);
  91
  92         return 0;
  93 }
  94 DEFINE_SHOW_ATTRIBUTE(dp_debug);
  95
  96 static int dp_test_data_show(struct seq_file *m, void *data)
  97 {
  98         const struct dp_debug_private *debug = m->private;
  99         const struct drm_connector *connector = debug->connector;
 100         u32 bpc;
 101
 102         if (connector->status == connector_status_connected) {
 103                 bpc = debug->link->test_video.test_bit_depth;
 104                 seq_printf(m, "hdisplay: %d\n",
 105                                 debug->link->test_video.test_h_width);
 106                 seq_printf(m, "vdisplay: %d\n",
 107                                 debug->link->test_video.test_v_height);
 108                 seq_printf(m, "bpc: %u\n",
 109                                 dp_link_bit_depth_to_bpc(bpc));
 110         } else {
 111                 seq_puts(m, "0");
 112         }
 113
 114         return 0;
 115 }
 116 DEFINE_SHOW_ATTRIBUTE(dp_test_data);
 117
 118 static int dp_test_type_show(struct seq_file *m, void *data)
 119 {
 120         const struct dp_debug_private *debug = m->private;
 121         const struct drm_connector *connector = debug->connector;
 122
 123         if (connector->status == connector_status_connected)
 124                 seq_printf(m, "%02x", DP_TEST_LINK_VIDEO_PATTERN);
 125         else
 126                 seq_puts(m, "0");
 127
 128         return 0;
 129 }
 130 DEFINE_SHOW_ATTRIBUTE(dp_test_type);
 131
 132 static ssize_t dp_test_active_write(struct file *file,
 133                 const char __user *ubuf,
 134                 size_t len, loff_t *offp)
 135 {
 136         char *input_buffer;
 137         int status = 0;
 138         const struct dp_debug_private *debug;
 139         const struct drm_connector *connector;
 140         int val = 0;
 141
 142         debug = ((struct seq_file *)file->private_data)->private;
 143         connector = debug->connector;
 144
 145         if (len == 0)
 146                 return 0;
 147
 148         input_buffer = memdup_user_nul(ubuf, len);
 149         if (IS_ERR(input_buffer))
 150                 return PTR_ERR(input_buffer);
 151
 152         DRM_DEBUG_DRIVER("Copied %d bytes from user\n", (unsigned int)len);
 153
 154         if (connector->status == connector_status_connected) {
 155                 status = kstrtoint(input_buffer, 10, &val);
 156                 if (status < 0) {
 157                         kfree(input_buffer);
 158                         return status;
 159                 }
 160                 DRM_DEBUG_DRIVER("Got %d for test active\n", val);
 161                 /* To prevent erroneous activation of the compliance
 162                  * testing code, only accept an actual value of 1 here
 163                  */
 164                 if (val == 1)
 165                         debug->panel->video_test = true;
 166                 else
 167                         debug->panel->video_test = false;
 168         }
 169         kfree(input_buffer);
 170
 171         *offp += len;
 172         return len;
 173 }
 174
 175 static int dp_test_active_show(struct seq_file *m, void *data)
 176 {
 177         struct dp_debug_private *debug = m->private;
 178         struct drm_connector *connector = debug->connector;
 179
 180         if (connector->status == connector_status_connected) {
 181                 if (debug->panel->video_test)
 182                         seq_puts(m, "1");
 183                 else
 184                         seq_puts(m, "0");
 185         } else {
 186                 seq_puts(m, "0");
 187         }
 188
 189         return 0;
 190 }
 191
 192 static int dp_test_active_open(struct inode *inode,
 193                 struct file *file)
 194 {
 195         return single_open(file, dp_test_active_show,
 196                         inode->i_private);
 197 }
 198
 199 static const struct file_operations test_active_fops = {
 200         .owner = THIS_MODULE,
 201         .open = dp_test_active_open,
 202         .read = seq_read,
 203         .llseek = seq_lseek,
 204         .release = single_release,
 205         .write = dp_test_active_write
 206 };
 207
 208 static void dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)
 209 {
 210         char path[64];
 211         struct dp_debug_private *debug = container_of(dp_debug,
 212                         struct dp_debug_private, dp_debug);
 213
 214         snprintf(path, sizeof(path), "msm_dp-%s", debug->connector->name);
 215
 216         debug->root = debugfs_create_dir(path, minor->debugfs_root);
 217
 218         debugfs_create_file("dp_debug", 0444, debug->root,
 219                         debug, &dp_debug_fops);
 220
 221         debugfs_create_file("msm_dp_test_active", 0444,
 222                         debug->root,
 223                         debug, &test_active_fops);
 224
 225         debugfs_create_file("msm_dp_test_data", 0444,
 226                         debug->root,
 227                         debug, &dp_test_data_fops);
 228
 229         debugfs_create_file("msm_dp_test_type", 0444,
 230                         debug->root,
 231                         debug, &dp_test_type_fops);
 232 }
 233
 234 struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,
 235                 struct dp_usbpd *usbpd, struct dp_link *link,
 236                 struct drm_connector *connector, struct drm_minor *minor)
 237 {
 238         struct dp_debug_private *debug;
 239         struct dp_debug *dp_debug;
 240         int rc;
 241
 242         if (!dev || !panel || !usbpd || !link) {
 243                 DRM_ERROR("invalid input\n");
 244                 rc = -EINVAL;
 245                 goto error;
 246         }
 247
 248         debug = devm_kzalloc(dev, sizeof(*debug), GFP_KERNEL);
 249         if (!debug) {
 250                 rc = -ENOMEM;
 251                 goto error;
 252         }
 253
 254         debug->dp_debug.debug_en = false;
 255         debug->usbpd = usbpd;
 256         debug->link = link;
 257         debug->panel = panel;
 258         debug->dev = dev;
 259         debug->drm_dev = minor->dev;
 260         debug->connector = connector;
 261
 262         dp_debug = &debug->dp_debug;
 263         dp_debug->vdisplay = 0;
 264         dp_debug->hdisplay = 0;
 265         dp_debug->vrefresh = 0;
 266
 267         dp_debug_init(dp_debug, minor);
 268
 269         return dp_debug;
 270  error:
 271         return ERR_PTR(rc);
 272 }
 273
 274 static int dp_debug_deinit(struct dp_debug *dp_debug)
 275 {
 276         struct dp_debug_private *debug;
 277
 278         if (!dp_debug)
 279                 return -EINVAL;
 280
 281         debug = container_of(dp_debug, struct dp_debug_private, dp_debug);
 282
 283         debugfs_remove_recursive(debug->root);
 284
 285         return 0;
 286 }
 287
 288 void dp_debug_put(struct dp_debug *dp_debug)
 289 {
 290         struct dp_debug_private *debug;
 291
 292         if (!dp_debug)
 293                 return;
 294
 295         debug = container_of(dp_debug, struct dp_debug_private, dp_debug);
 296
 297         dp_debug_deinit(dp_debug);
 298
 299         devm_kfree(debug->dev, debug);
 300 }