@@ -72,7 +72,8 @@
#define PIIX4_BLOCK_DATA 0x14
/* Multi-port constants */
-#define PIIX4_MAX_ADAPTERS 4
+#define PIIX4_MAX_ADAPTERS 4
+#define HUDSON2_MAIN_PORTS 2 /* HUDSON2, KERNCZ reserves ports 3, 4 */
/* SB800 constants */
#define SB800_PIIX4_SMB_IDX 0xcd6
@@ -806,6 +807,7 @@ MODULE_DEVICE_TABLE (pci, piix4_ids);
static struct i2c_adapter *piix4_main_adapters[PIIX4_MAX_ADAPTERS];
static struct i2c_adapter *piix4_aux_adapter;
+static int piix4_adapter_count;
static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
bool sb800_main, u8 port, bool notify_imc,
@@ -865,7 +867,15 @@ static int piix4_add_adapters_sb800(stru
int port;
int retval;
- for (port = 0; port < PIIX4_MAX_ADAPTERS; port++) {
+ if (dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS ||
+ (dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
+ dev->revision >= 0x1F)) {
+ piix4_adapter_count = HUDSON2_MAIN_PORTS;
+ } else {
+ piix4_adapter_count = PIIX4_MAX_ADAPTERS;
+ }
+
+ for (port = 0; port < piix4_adapter_count; port++) {
retval = piix4_add_adapter(dev, smba, true, port, notify_imc,
piix4_main_port_names_sb800[port],
&piix4_main_adapters[port]);
@@ -987,7 +997,7 @@ static void piix4_adap_remove(struct i2c
static void piix4_remove(struct pci_dev *dev)
{
- int port = PIIX4_MAX_ADAPTERS;
+ int port = piix4_adapter_count;
while (--port >= 0) {
if (piix4_main_adapters[port]) {
Prevent bus timeouts and resets on Family 16h Model 30h by not probing reserved Ports 3 and 4. According to the AMD BIOS and Kernel Developer's Guides (BKDG), Port 3 and Port 4 are reserved on the following devices: - Family 15h Model 60h-6Fh - Family 15h Model 70h-7Fh - Family 16h Model 30h-3Fh Based on earlier work by Andrew Cooks. Reported-by: Andrew Cooks <andrew.cooks@opengear.com> Signed-off-by: Jean Delvare <jdelvare@suse.de> --- Changes since v4: * Fix subject line * Drop local variable port_count, use piix4_adapter_count everywhere to represent the maximum number of main SMBus ports * Exclude early Hudson2 implementations from this change drivers/i2c/busses/i2c-piix4.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-)