71 lines
2.1 KiB
Diff
71 lines
2.1 KiB
Diff
From d2391d8e17532da2e4edf69672504cad2ab4bca1 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Tue, 6 Oct 2020 18:44:42 +0100
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Subject: [PATCH] drm/vc4: Add debugfs node that dumps the current
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display lists
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This allows easy analysis of display lists when debugging.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/gpu/drm/vc4/vc4_hvs.c | 41 +++++++++++++++++++++++++++++++++++
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1 file changed, 41 insertions(+)
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--- a/drivers/gpu/drm/vc4/vc4_hvs.c
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+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
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@@ -95,6 +95,45 @@ static int vc4_hvs_debugfs_underrun(stru
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return 0;
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}
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+static int vc4_hvs_debugfs_dlist(struct seq_file *m, void *data)
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+{
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+ struct drm_info_node *node = m->private;
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+ struct drm_device *dev = node->minor->dev;
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+ struct vc4_dev *vc4 = to_vc4_dev(dev);
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+ struct drm_printer p = drm_seq_file_printer(m);
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+ unsigned int next_entry_start = 0;
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+ unsigned int i, j;
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+ u32 dlist_word, dispstat;
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+
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+ for (i = 0; i < SCALER_CHANNELS_COUNT; i++) {
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+ dispstat = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTATX(i)),
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+ SCALER_DISPSTATX_MODE);
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+ if (dispstat == SCALER_DISPSTATX_MODE_DISABLED ||
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+ dispstat == SCALER_DISPSTATX_MODE_EOF) {
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+ drm_printf(&p, "HVS chan %u disabled\n", i);
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+ continue;
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+ }
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+
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+ drm_printf(&p, "HVS chan %u:\n", i);
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+
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+ for (j = HVS_READ(SCALER_DISPLISTX(i)); j < 256; j++) {
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+ dlist_word = readl((u32 __iomem *)vc4->hvs->dlist + j);
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+ drm_printf(&p, "dlist: %02d: 0x%08x\n", j,
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+ dlist_word);
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+ if (!next_entry_start ||
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+ next_entry_start == j) {
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+ if (dlist_word & SCALER_CTL0_END)
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+ break;
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+ next_entry_start = j +
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+ VC4_GET_FIELD(dlist_word,
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+ SCALER_CTL0_SIZE);
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+ }
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+ }
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+ }
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+
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+ return 0;
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+}
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+
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/* The filter kernel is composed of dwords each containing 3 9-bit
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* signed integers packed next to each other.
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*/
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@@ -728,6 +767,8 @@ static int vc4_hvs_bind(struct device *d
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vc4_debugfs_add_regset32(drm, "hvs_regs", &hvs->regset);
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vc4_debugfs_add_file(drm, "hvs_underrun", vc4_hvs_debugfs_underrun,
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NULL);
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+ vc4_debugfs_add_file(drm, "hvs_dlists", vc4_hvs_debugfs_dlist,
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+ NULL);
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return 0;
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}
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