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Code

drm/vc4: hvs: Add debugfs node that dumps the current display lists

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This allows easy analysis of display lists when debugging.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://lore.kernel.org/r/20220613144800.326124-8-maxime@cerno.tech
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
This commit is contained in:
Dave Stevenson 2022-06-13 16:47:34 +02:00 committed by Maxime Ripard
parent a1aaefbacc
commit c6dac00340
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GPG Key ID: E3EF0D6F671851C5
1 changed files with 42 additions and 0 deletions
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42
drivers/gpu/drm/vc4/vc4_hvs.c
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@ -94,6 +94,46 @@ static int vc4_hvs_debugfs_underrun(struct seq_file *m, void *data)
return 0;
}
static int vc4_hvs_debugfs_dlist(struct seq_file *m, void *data)
{
struct drm_info_node *node = m->private;
struct drm_device *dev = node->minor->dev;
struct vc4_dev *vc4 = to_vc4_dev(dev);
struct vc4_hvs *hvs = vc4->hvs;
struct drm_printer p = drm_seq_file_printer(m);
unsigned int next_entry_start = 0;
unsigned int i, j;
u32 dlist_word, dispstat;
for (i = 0; i < SCALER_CHANNELS_COUNT; i++) {
dispstat = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTATX(i)),
SCALER_DISPSTATX_MODE);
if (dispstat == SCALER_DISPSTATX_MODE_DISABLED ||
dispstat == SCALER_DISPSTATX_MODE_EOF) {
drm_printf(&p, "HVS chan %u disabled\n", i);
continue;
}
drm_printf(&p, "HVS chan %u:\n", i);
for (j = HVS_READ(SCALER_DISPLISTX(i)); j < 256; j++) {
dlist_word = readl((u32 __iomem *)vc4->hvs->dlist + j);
drm_printf(&p, "dlist: %02d: 0x%08x\n", j,
dlist_word);
if (!next_entry_start ||
next_entry_start == j) {
if (dlist_word & SCALER_CTL0_END)
break;
next_entry_start = j +
VC4_GET_FIELD(dlist_word,
SCALER_CTL0_SIZE);
}
}
}
return 0;
}
/* The filter kernel is composed of dwords each containing 3 9-bit
* signed integers packed next to each other.
*/
@ -734,6 +774,8 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
vc4_debugfs_add_regset32(drm, "hvs_regs", &hvs->regset);
vc4_debugfs_add_file(drm, "hvs_underrun", vc4_hvs_debugfs_underrun,
NULL);
vc4_debugfs_add_file(drm, "hvs_dlists", vc4_hvs_debugfs_dlist,
NULL);
return 0;
}