target/linux/bcm27xx/patches-5.15/950-0426-drm-vc4-Add-debugfs-node-that-dumps-the-current-disp.patch

   1 From d2391d8e17532da2e4edf69672504cad2ab4bca1 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Tue, 6 Oct 2020 18:44:42 +0100
   4 Subject: [PATCH] drm/vc4: Add debugfs node that dumps the current
   5  display lists
   6
   7 This allows easy analysis of display lists when debugging.
   8
   9 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  10 ---
  11  drivers/gpu/drm/vc4/vc4_hvs.c | 41 +++++++++++++++++++++++++++++++++++
  12  1 file changed, 41 insertions(+)
  13
  14 --- a/drivers/gpu/drm/vc4/vc4_hvs.c
  15 +++ b/drivers/gpu/drm/vc4/vc4_hvs.c
  16 @@ -95,6 +95,45 @@ static int vc4_hvs_debugfs_underrun(stru
  17         return 0;
  18  }
  19
  20 +static int vc4_hvs_debugfs_dlist(struct seq_file *m, void *data)
  21 +{
  22 +       struct drm_info_node *node = m->private;
  23 +       struct drm_device *dev = node->minor->dev;
  24 +       struct vc4_dev *vc4 = to_vc4_dev(dev);
  25 +       struct drm_printer p = drm_seq_file_printer(m);
  26 +       unsigned int next_entry_start = 0;
  27 +       unsigned int i, j;
  28 +       u32 dlist_word, dispstat;
  29 +
  30 +       for (i = 0; i < SCALER_CHANNELS_COUNT; i++) {
  31 +               dispstat = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTATX(i)),
  32 +                                        SCALER_DISPSTATX_MODE);
  33 +               if (dispstat == SCALER_DISPSTATX_MODE_DISABLED ||
  34 +                   dispstat == SCALER_DISPSTATX_MODE_EOF) {
  35 +                       drm_printf(&p, "HVS chan %u disabled\n", i);
  36 +                       continue;
  37 +               }
  38 +
  39 +               drm_printf(&p, "HVS chan %u:\n", i);
  40 +
  41 +               for (j = HVS_READ(SCALER_DISPLISTX(i)); j < 256; j++) {
  42 +                       dlist_word = readl((u32 __iomem *)vc4->hvs->dlist + j);
  43 +                       drm_printf(&p, "dlist: %02d: 0x%08x\n", j,
  44 +                                  dlist_word);
  45 +                       if (!next_entry_start ||
  46 +                           next_entry_start == j) {
  47 +                               if (dlist_word & SCALER_CTL0_END)
  48 +                                       break;
  49 +                               next_entry_start = j +
  50 +                                       VC4_GET_FIELD(dlist_word,
  51 +                                                     SCALER_CTL0_SIZE);
  52 +                       }
  53 +               }
  54 +       }
  55 +
  56 +       return 0;
  57 +}
  58 +
  59  /* The filter kernel is composed of dwords each containing 3 9-bit
  60   * signed integers packed next to each other.
  61   */
  62 @@ -689,6 +728,8 @@ static int vc4_hvs_bind(struct device *d
  63         vc4_debugfs_add_regset32(drm, "hvs_regs", &hvs->regset);
  64         vc4_debugfs_add_file(drm, "hvs_underrun", vc4_hvs_debugfs_underrun,
  65                              NULL);
  66 +       vc4_debugfs_add_file(drm, "hvs_dlists", vc4_hvs_debugfs_dlist,
  67 +                            NULL);
  68
  69         return 0;
  70  }