soc: renesas: r8a77990-sysc: Fix initialization order of 3DG-{A,B}

[ Upstream commit b0d7fbf8 ]

The workaround for the wrong hierarchy of the 3DG-{A,B} power
domains on R-Car E3 ES1.0 corrected the parent domains.
However, the 3DG-{A,B} power domains were still initialized and powered
in the wrong order, causing 3DG operation to fail.

Fix this by changing the order in the table at runtime, when running on
an affected SoC.

Fixes: 086b3999 ("soc: renesas: r8a77990-sysc: Add workaround for 3DG-{A,B}")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/soc/renesas/r8a77990-sysc.c

@@ -28,19 +28,6 @@ static struct rcar_sysc_area r8a77990_areas[] __initdata = {
 	{ "3dg-b",	0x100, 1, R8A77990_PD_3DG_B,	R8A77990_PD_3DG_A },
 };
 
-static void __init rcar_sysc_fix_parent(struct rcar_sysc_area *areas,
-					unsigned int num_areas, u8 id,
-					int new_parent)
-{
-	unsigned int i;
-
-	for (i = 0; i < num_areas; i++)
-		if (areas[i].isr_bit == id) {
-			areas[i].parent = new_parent;
-			return;
-		}
-}
-
 /* Fixups for R-Car E3 ES1.0 revision */
 static const struct soc_device_attribute r8a77990[] __initconst = {
 	{ .soc_id = "r8a77990", .revision = "ES1.0" },
@@ -50,12 +37,10 @@ static const struct soc_device_attribute r8a77990[] __initconst = {
 static int __init r8a77990_sysc_init(void)
 {
 	if (soc_device_match(r8a77990)) {
-		rcar_sysc_fix_parent(r8a77990_areas,
-				     ARRAY_SIZE(r8a77990_areas),
-				     R8A77990_PD_3DG_A, R8A77990_PD_3DG_B);
-		rcar_sysc_fix_parent(r8a77990_areas,
-				     ARRAY_SIZE(r8a77990_areas),
-				     R8A77990_PD_3DG_B, R8A77990_PD_ALWAYS_ON);
+		/* Fix incorrect 3DG hierarchy */
+		swap(r8a77990_areas[7], r8a77990_areas[8]);
+		r8a77990_areas[7].parent = R8A77990_PD_ALWAYS_ON;
+		r8a77990_areas[8].parent = R8A77990_PD_3DG_B;
 	}
 
 	return 0;