From 3905be68859b15731ec41b3d22cd1a9069375f7f Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Wed, 28 Apr 2021 12:32:10 +0200 Subject: [PATCH] drm/vc4: Add debugfs node that dumps the vc5 gamma PWL entries 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 Signed-off-by: Juerg Haefliger Signed-off-by: Dave Stevenson Signed-off-by: Maxime Ripard --- drivers/gpu/drm/vc4/vc4_hvs.c | 85 ++++++++++++++++++++++++++++++++++- 1 file changed, 84 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/vc4/vc4_hvs.c +++ b/drivers/gpu/drm/vc4/vc4_hvs.c @@ -141,6 +141,85 @@ static int vc4_hvs_debugfs_dlist(struct 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. */ @@ -833,11 +912,15 @@ int vc4_hvs_debugfs_init(struct drm_mino 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); + vc4_debugfs_add_file(minor, "hvs_gamma", vc5_hvs_debugfs_gamma, + NULL); + } + ret = vc4_debugfs_add_file(minor, "hvs_dlists", vc4_hvs_debugfs_dlist, NULL); if (ret)