drm/amd/display: Try RGB before YCbCr 4:4:4 in stream validationgrafted

amdgpu_dm_create_validate_stream_for_sink() walks encoding_order[] and
uses the first encoding that validates. YCbCr 4:4:4 is listed before
RGB, so an HDMI sink that advertises 4:4:4 gets YCbCr 4:4:4 whenever the
"color format" property is left at AUTO, even though RGB fits the same
link.

That contradicts the documented AUTO behaviour for HDMI in enum
drm_connector_color_format (RGB, falling back to YCbCr 4:2:0 only when
the bandwidth is not available or the mode is 4:2:0-only), which the
amdgpu implementation of the property also describes. It also leaves
the "Broadcast RGB" property without effect on such sinks, since the
quantization range it selects only applies to RGB output.

Try RGB first. The mask still holds every encoding the sink supports,
so a mode that cannot carry RGB falls back exactly as before.

For reference, v7.2 picked RGB here unless YCbCr 4:4:4 was forced
through debugfs, while earlier kernels picked YCbCr 4:4:4 for any HDMI
sink that advertised it.

Fixes: 0b0ff65d3ca1 ("drm/amd/display: Refactor stream validation")
Suggested-by: Adolfo Rodrigues <adolfotregosa@gmail.com>
Assisted-by: Claude Code:claude-fable-5-1
Signed-off-by: Adrian Betschart <adrian.betschart@cinemaone.ch>
Reviewed-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Adolfo Rodrigues <adolfotregosa@gmail.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 7de432bc753133764dc40d37f9388da56de251e7)

1 files changed, 93 insertions, 0 deletions

diff --git a/arch/powerpc/boot/of.c b/arch/powerpc/boot/of.c
new file mode 100644
index 000000000..2fbd4ae60
--- /dev/null
+++ b/arch/powerpc/boot/of.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) Paul Mackerras 1997.
+ */
+#include <stdarg.h>
+#include <stddef.h>
+#include "types.h"
+#include "elf.h"
+#include "string.h"
+#include "stdio.h"
+#include "page.h"
+#include "ops.h"
+
+#include "of.h"
+
+/* Value picked to match that used by yaboot */
+#define PROG_START	0x01400000	/* only used on 64-bit systems */
+#define RAM_END		(512<<20)	/* Fixme: use OF */
+#define	ONE_MB		0x100000
+
+
+
+static unsigned long claim_base;
+
+void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
+			 unsigned long r6, unsigned long r7);
+
+static void *of_try_claim(unsigned long size)
+{
+	unsigned long addr = 0;
+
+	if (claim_base == 0)
+		claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
+
+	for(; claim_base < RAM_END; claim_base += ONE_MB) {
+#ifdef DEBUG
+		printf("    trying: 0x%08lx\n\r", claim_base);
+#endif
+		addr = (unsigned long) of_claim(claim_base, size, 0);
+		if (addr != PROM_ERROR)
+			break;
+	}
+	if (addr == 0)
+		return NULL;
+	claim_base = PAGE_ALIGN(claim_base + size);
+	return (void *)addr;
+}
+
+static void of_image_hdr(const void *hdr)
+{
+	const Elf64_Ehdr *elf64 = hdr;
+
+	if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
+		/*
+		 * Maintain a "magic" minimum address. This keeps some older
+		 * firmware platforms running.
+		 */
+		if (claim_base < PROG_START)
+			claim_base = PROG_START;
+	}
+}
+
+static void of_platform_init(unsigned long a1, unsigned long a2, void *promptr)
+{
+	platform_ops.image_hdr = of_image_hdr;
+	platform_ops.malloc = of_try_claim;
+	platform_ops.exit = of_exit;
+	platform_ops.vmlinux_alloc = of_vmlinux_alloc;
+
+	dt_ops.finddevice = of_finddevice;
+	dt_ops.getprop = of_getprop;
+	dt_ops.setprop = of_setprop;
+
+	of_console_init();
+
+	of_init(promptr);
+	loader_info.promptr = promptr;
+	if (a1 && a2 && a2 != 0xdeadbeef) {
+		loader_info.initrd_addr = a1;
+		loader_info.initrd_size = a2;
+	}
+}
+
+void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
+		   unsigned long r6, unsigned long r7)
+{
+	/* Detect OF vs. ePAPR boot */
+	if (r5)
+		of_platform_init(r3, r4, (void *)r5);
+	else
+		epapr_platform_init(r3, r4, r5, r6, r7);
+}
+