drm/nouveau/bios/pll: initial support for BIT 'C' version 2

Just enough to get at the PLL table.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/subdev/bios/pll.c

@@ -77,15 +77,17 @@ g84_pll_mapping[] = {
 	{}
 };
 
-static u16
+static u32
 pll_limits_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
 {
 	struct bit_entry bit_C;
-	u16 data = 0x0000;
+	u32 data = 0x0000;
 
 	if (!bit_entry(bios, 'C', &bit_C)) {
 		if (bit_C.version == 1 && bit_C.length >= 10)
 			data = nvbios_rd16(bios, bit_C.offset + 8);
+		if (bit_C.version == 2 && bit_C.length >= 4)
+			data = nvbios_rd32(bios, bit_C.offset + 0);
 		if (data) {
 			*ver = nvbios_rd08(bios, data + 0);
 			*hdr = nvbios_rd08(bios, data + 1);
@@ -137,12 +139,12 @@ pll_map(struct nvkm_bios *bios)
 	}
 }
 
-static u16
+static u32
 pll_map_reg(struct nvkm_bios *bios, u32 reg, u32 *type, u8 *ver, u8 *len)
 {
 	struct pll_mapping *map;
 	u8  hdr, cnt;
-	u16 data;
+	u32 data;
 
 	data = pll_limits_table(bios, ver, &hdr, &cnt, len);
 	if (data && *ver >= 0x30) {
@@ -160,7 +162,7 @@ pll_map_reg(struct nvkm_bios *bios, u32 reg, u32 *type, u8 *ver, u8 *len)
 	map = pll_map(bios);
 	while (map && map->reg) {
 		if (map->reg == reg && *ver >= 0x20) {
-			u16 addr = (data += hdr);
+			u32 addr = (data += hdr);
 			*type = map->type;
 			while (cnt--) {
 				if (nvbios_rd32(bios, data) == map->reg)
@@ -179,12 +181,12 @@ pll_map_reg(struct nvkm_bios *bios, u32 reg, u32 *type, u8 *ver, u8 *len)
 	return 0x0000;
 }
 
-static u16
+static u32
 pll_map_type(struct nvkm_bios *bios, u8 type, u32 *reg, u8 *ver, u8 *len)
 {
 	struct pll_mapping *map;
 	u8  hdr, cnt;
-	u16 data;
+	u32 data;
 
 	data = pll_limits_table(bios, ver, &hdr, &cnt, len);
 	if (data && *ver >= 0x30) {
@@ -202,7 +204,7 @@ pll_map_type(struct nvkm_bios *bios, u8 type, u32 *reg, u8 *ver, u8 *len)
 	map = pll_map(bios);
 	while (map && map->reg) {
 		if (map->type == type && *ver >= 0x20) {
-			u16 addr = (data += hdr);
+			u32 addr = (data += hdr);
 			*reg = map->reg;
 			while (cnt--) {
 				if (nvbios_rd32(bios, data) == map->reg)
@@ -228,7 +230,7 @@ nvbios_pll_parse(struct nvkm_bios *bios, u32 type, struct nvbios_pll *info)
 	struct nvkm_device *device = subdev->device;
 	u8  ver, len;
 	u32 reg = type;
-	u16 data;
+	u32 data;
 
 	if (type > PLL_MAX) {
 		reg  = type;