bcm27xx: add support for linux v5.15

Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 70 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0426-drm-vc4-Add-debugfs-node-that-dumps-the-current-disp.patch b/target/linux/bcm27xx/patches-5.15/950-0426-drm-vc4-Add-debugfs-node-that-dumps-the-current-disp.patch
new file mode 100644
index 0000000000..c21fcc8ace
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0426-drm-vc4-Add-debugfs-node-that-dumps-the-current-disp.patch
@@ -0,0 +1,70 @@
+From d2391d8e17532da2e4edf69672504cad2ab4bca1 Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.com>
+Date: Tue, 6 Oct 2020 18:44:42 +0100
+Subject: [PATCH] drm/vc4: Add debugfs node that dumps the current
+ display lists
+
+This allows easy analysis of display lists when debugging.
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
+---
+ drivers/gpu/drm/vc4/vc4_hvs.c | 41 +++++++++++++++++++++++++++++++++++
+ 1 file changed, 41 insertions(+)
+
+--- a/drivers/gpu/drm/vc4/vc4_hvs.c
++++ b/drivers/gpu/drm/vc4/vc4_hvs.c
+@@ -95,6 +95,45 @@ static int vc4_hvs_debugfs_underrun(stru
+ 	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 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.
+  */
+@@ -689,6 +728,8 @@ static int vc4_hvs_bind(struct device *d
+ 	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;
+ }