soc: renesas: r8a774c0-sysc: Fix initialization order of 3DG-{A,B}

The workaround for the wrong hierarchy of the 3DG-{A,B} power domains on
RZ/G2E 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.

This work is based on the work done by Geert for R-Car E3.

Fixes: f37d211c ("soc: renesas: rcar-sysc: Add r8a774c0 support")
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

drivers/soc/renesas/r8a774c0-sysc.c

@@ -28,19 +28,6 @@ static struct rcar_sysc_area r8a774c0_areas[] __initdata = {
 	{ "3dg-b",	0x100, 1, R8A774C0_PD_3DG_B,	R8A774C0_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 RZ/G2E ES1.0 revision */
 static const struct soc_device_attribute r8a774c0[] __initconst = {
 	{ .soc_id = "r8a774c0", .revision = "ES1.0" },
@@ -50,12 +37,10 @@ static const struct soc_device_attribute r8a774c0[] __initconst = {
 static int __init r8a774c0_sysc_init(void)
 {
 	if (soc_device_match(r8a774c0)) {
-		rcar_sysc_fix_parent(r8a774c0_areas,
-				     ARRAY_SIZE(r8a774c0_areas),
-				     R8A774C0_PD_3DG_A, R8A774C0_PD_3DG_B);
-		rcar_sysc_fix_parent(r8a774c0_areas,
-				     ARRAY_SIZE(r8a774c0_areas),
-				     R8A774C0_PD_3DG_B, R8A774C0_PD_ALWAYS_ON);
+		/* Fix incorrect 3DG hierarchy */
+		swap(r8a774c0_areas[6], r8a774c0_areas[7]);
+		r8a774c0_areas[6].parent = R8A774C0_PD_ALWAYS_ON;
+		r8a774c0_areas[7].parent = R8A774C0_PD_3DG_B;
 	}
 
 	return 0;