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drm/vc4: Add debugfs node that dumps the vc5 gamma PWL entries

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This helps with debugging the conversion from a 256 point gamma LUT to
16 point PWL entries as used by the BCM2711.

Co-developed-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
This commit is contained in:
Dave Stevenson
2021-04-28 12:32:10 +02:00
committed by Dom Cobley
parent e245dd54c8
commit fe13d22042
1 changed files with 84 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

85
drivers/gpu/drm/vc4/vc4_hvs.c
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@@ -143,6 +143,85 @@ static int vc4_hvs_debugfs_dlist(struct seq_file *m, void *data)
return 0;
}
static int vc5_hvs_debugfs_gamma(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 i, chan;
u32 dispstat, dispbkgndx;
for (chan = 0; chan < SCALER_CHANNELS_COUNT; chan++) {
u32 x_c, grad;
u32 offset = SCALER5_DSPGAMMA_START +
chan * SCALER5_DSPGAMMA_CHAN_OFFSET;
dispstat = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTATX(chan)),
SCALER_DISPSTATX_MODE);
if (dispstat == SCALER_DISPSTATX_MODE_DISABLED ||
dispstat == SCALER_DISPSTATX_MODE_EOF) {
drm_printf(&p, "HVS channel %u: Channel disabled\n", chan);
continue;
}
dispbkgndx = HVS_READ(SCALER_DISPBKGNDX(chan));
if (!(dispbkgndx & SCALER_DISPBKGND_GAMMA)) {
drm_printf(&p, "HVS channel %u: Gamma disabled\n", chan);
continue;
}
drm_printf(&p, "HVS channel %u:\n", chan);
drm_printf(&p, " red:\n");
for (i = 0; i < SCALER5_DSPGAMMA_NUM_POINTS; i++, offset += 8) {
x_c = HVS_READ(offset);
grad = HVS_READ(offset + 4);
drm_printf(&p, " %08x %08x - x %u, c %u, grad %u\n",
x_c, grad,
VC4_GET_FIELD(x_c, SCALER5_DSPGAMMA_OFF_X),
VC4_GET_FIELD(x_c, SCALER5_DSPGAMMA_OFF_C),
grad);
}
drm_printf(&p, " green:\n");
for (i = 0; i < SCALER5_DSPGAMMA_NUM_POINTS; i++, offset += 8) {
x_c = HVS_READ(offset);
grad = HVS_READ(offset + 4);
drm_printf(&p, " %08x %08x - x %u, c %u, grad %u\n",
x_c, grad,
VC4_GET_FIELD(x_c, SCALER5_DSPGAMMA_OFF_X),
VC4_GET_FIELD(x_c, SCALER5_DSPGAMMA_OFF_C),
grad);
}
drm_printf(&p, " blue:\n");
for (i = 0; i < SCALER5_DSPGAMMA_NUM_POINTS; i++, offset += 8) {
x_c = HVS_READ(offset);
grad = HVS_READ(offset + 4);
drm_printf(&p, " %08x %08x - x %u, c %u, grad %u\n",
x_c, grad,
VC4_GET_FIELD(x_c, SCALER5_DSPGAMMA_OFF_X),
VC4_GET_FIELD(x_c, SCALER5_DSPGAMMA_OFF_C),
grad);
}
/* Alpha only valid on channel 2 */
if (chan != 2)
continue;
drm_printf(&p, " alpha:\n");
for (i = 0; i < SCALER5_DSPGAMMA_NUM_POINTS; i++, offset += 8) {
x_c = HVS_READ(offset);
grad = HVS_READ(offset + 4);
drm_printf(&p, " %08x %08x - x %u, c %u, grad %u\n",
x_c, grad,
VC4_GET_FIELD(x_c, SCALER5_DSPGAMMA_OFF_X),
VC4_GET_FIELD(x_c, SCALER5_DSPGAMMA_OFF_C),
grad);
}
}
return 0;
}
/* The filter kernel is composed of dwords each containing 3 9-bit
* signed integers packed next to each other.
*/
@@ -850,11 +929,15 @@ int vc4_hvs_debugfs_init(struct drm_minor *minor)
if (!vc4->hvs)
return -ENODEV;
if (!vc4->is_vc5)
if (!vc4->is_vc5) {
debugfs_create_bool("hvs_load_tracker", S_IRUGO | S_IWUSR,
minor->debugfs_root,
&vc4->load_tracker_enabled);
drm_debugfs_add_file(drm, "hvs_gamma", vc5_hvs_debugfs_gamma,
NULL);
}
drm_debugfs_add_file(drm, "hvs_dlists", vc4_hvs_debugfs_dlist, NULL);
drm_debugfs_add_file(drm, "hvs_underrun", vc4_hvs_debugfs_underrun, NULL);