amd64_edac: Sanitize ->read_dram_ctl_register

This function is relevant for F10h and higher, and it has only one
callsite so drop its function pointer from the low_ops struct.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

drivers/edac/amd64_edac.c

@@ -1138,16 +1138,18 @@ static int f10_dbam_to_chip_select(struct amd64_pvt *pvt, int cs_mode)
 	return dbam_map[cs_mode];
 }
 
-static void f10_read_dram_ctl_register(struct amd64_pvt *pvt)
+static void read_dram_ctl_register(struct amd64_pvt *pvt)
 {
 
+	if (boot_cpu_data.x86 == 0xf)
+		return;
+
 	if (!amd64_read_dct_pci_cfg(pvt, DCT_SEL_LO, &pvt->dct_sel_lo)) {
 		debugf0("F2x110 (DCTSelLow): 0x%08x, High range addrs at: 0x%x\n",
 			pvt->dct_sel_lo, dct_sel_baseaddr(pvt));
 
-		debugf0("  mode: %s, All DCTs on: %s\n",
-			(dct_ganging_enabled(pvt) ? "ganged" : "unganged"),
-			(dct_dram_enabled(pvt) ? "yes"   : "no"));
+		debugf0("  DCTs operate in %s mode.\n",
+			(dct_ganging_enabled(pvt) ? "ganged" : "unganged"));
 
 		if (!dct_ganging_enabled(pvt))
 			debugf0("  Address range split per DCT: %s\n",
@@ -1579,7 +1581,6 @@ static struct amd64_family_type amd64_family_types[] = {
 		.f3_id = PCI_DEVICE_ID_AMD_10H_NB_MISC,
 		.ops = {
 			.early_channel_count	= f1x_early_channel_count,
-			.read_dram_ctl_register	= f10_read_dram_ctl_register,
 			.map_sysaddr_to_csrow	= f1x_map_sysaddr_to_csrow,
 			.dbam_to_cs		= f10_dbam_to_chip_select,
 			.read_dct_pci_cfg	= f10_read_dct_pci_cfg,
@@ -1939,8 +1940,7 @@ static void read_mc_regs(struct amd64_pvt *pvt)
 
 	amd64_read_pci_cfg(pvt->F3, NBCAP, &pvt->nbcap);
 
-	if (pvt->ops->read_dram_ctl_register)
-		pvt->ops->read_dram_ctl_register(pvt);
+	read_dram_ctl_register(pvt);
 
 	for (range = 0; range < DRAM_RANGES; range++) {
 		u8 rw;

drivers/edac/amd64_edac.h

@@ -236,7 +236,6 @@
 #define dct_ganging_enabled(pvt)	((boot_cpu_data.x86 == 0x10) && ((pvt)->dct_sel_lo & BIT(4)))
 
 #define dct_data_intlv_enabled(pvt)	((pvt)->dct_sel_lo & BIT(5))
-#define dct_dram_enabled(pvt)		((pvt)->dct_sel_lo & BIT(8))
 #define dct_memory_cleared(pvt)		((pvt)->dct_sel_lo & BIT(10))
 
 #define SWAP_INTLV_REG			0x10c
@@ -444,7 +443,6 @@ extern struct mcidev_sysfs_attribute amd64_dbg_attrs[NUM_DBG_ATTRS],
  */
 struct low_ops {
 	int (*early_channel_count)	(struct amd64_pvt *pvt);
-	void (*read_dram_ctl_register)	(struct amd64_pvt *pvt);
 	void (*map_sysaddr_to_csrow)	(struct mem_ctl_info *mci, u64 sys_addr,
 					 u16 syndrome);
 	int (*dbam_to_cs)		(struct amd64_pvt *pvt, int cs_mode);