[PATCH 2/3] i2c: i2c-piix4: Synchronize I/O port accesses with the SB800 USB quirk
From: Zoltan Boszormenyi
Date: Sat Apr 01 2017 - 07:09:11 EST
Use the new header and the common mutex in the i2c-piix4 driver.
At the same time, remove the request_region() call to reserve
these I/O ports, so the sp5100_tco watchdog driver is fixed.
The mutex is enough to protect the I/O port accesses. This is
an old regression in Linux 4.4-rc4, caused by:
commit 2fee61d22e606fc99ade9079fda15fdee83ec33e
Author: Christian Fetzer <fetzer.ch@xxxxxxxxx>
Date: Thu Nov 19 20:13:48 2015 +0100
i2c: piix4: Add support for multiplexed main adapter in SB800
Signed-off-by: Zoltan Boszormenyi <zboszor@xxxxx>
---
drivers/i2c/busses/i2c-piix4.c | 59 ++++++++++++++----------------------------
1 file changed, 19 insertions(+), 40 deletions(-)
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index c21ca7b..a4549e5 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -40,7 +40,7 @@
#include <linux/dmi.h>
#include <linux/acpi.h>
#include <linux/io.h>
-#include <linux/mutex.h>
+#include <linux/sb800.h>
/* PIIX4 SMBus address offsets */
@@ -82,9 +82,6 @@
/* Multi-port constants */
#define PIIX4_MAX_ADAPTERS 4
-/* SB800 constants */
-#define SB800_PIIX4_SMB_IDX 0xcd6
-
/*
* SB800 port is selected by bits 2:1 of the smb_en register (0x2c)
* or the smb_sel register (0x2e), depending on bit 0 of register 0x2f.
@@ -144,10 +141,9 @@ static const struct dmi_system_id piix4_dmi_ibm[] = {
/*
* SB800 globals
- * piix4_mutex_sb800 protects piix4_port_sel_sb800 and the pair
- * of I/O ports at SB800_PIIX4_SMB_IDX.
+ * sb800_mutex in drivers/usb/host/pci-quirks.c protects
+ * piix4_port_sel_sb800 and the pair of I/O ports at SB800_PIIX4_SMB_IDX.
*/
-static DEFINE_MUTEX(piix4_mutex_sb800);
static u8 piix4_port_sel_sb800;
static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = {
" port 0", " port 2", " port 3", " port 4"
@@ -157,8 +153,6 @@ static const char *piix4_aux_port_name_sb800 = " port 1";
struct i2c_piix4_adapdata {
unsigned short smba;
- /* SB800 */
- bool sb800_main;
u8 port; /* Port number, shifted */
};
@@ -286,12 +280,12 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
else
smb_en = (aux) ? 0x28 : 0x2c;
- mutex_lock(&piix4_mutex_sb800);
+ enter_sb800();
outb_p(smb_en, SB800_PIIX4_SMB_IDX);
- smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
+ smba_en_lo = inb_p(SB800_PIIX4_SMB_DATA);
outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
- smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
- mutex_unlock(&piix4_mutex_sb800);
+ smba_en_hi = inb_p(SB800_PIIX4_SMB_DATA);
+ leave_sb800();
if (!smb_en) {
smb_en_status = smba_en_lo & 0x10;
@@ -349,13 +343,13 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
if (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD) {
piix4_port_sel_sb800 = SB800_PIIX4_PORT_IDX_ALT;
} else {
- mutex_lock(&piix4_mutex_sb800);
+ enter_sb800();
outb_p(SB800_PIIX4_PORT_IDX_SEL, SB800_PIIX4_SMB_IDX);
- port_sel = inb_p(SB800_PIIX4_SMB_IDX + 1);
+ port_sel = inb_p(SB800_PIIX4_SMB_DATA);
piix4_port_sel_sb800 = (port_sel & 0x01) ?
SB800_PIIX4_PORT_IDX_ALT :
SB800_PIIX4_PORT_IDX;
- mutex_unlock(&piix4_mutex_sb800);
+ leave_sb800();
}
dev_info(&PIIX4_dev->dev,
@@ -592,7 +586,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
u8 port;
int retval;
- mutex_lock(&piix4_mutex_sb800);
+ enter_sb800();
/* Request the SMBUS semaphore, avoid conflicts with the IMC */
smbslvcnt = inb_p(SMBSLVCNT);
@@ -608,27 +602,27 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
} while (--retries);
/* SMBus is still owned by the IMC, we give up */
if (!retries) {
- mutex_unlock(&piix4_mutex_sb800);
+ leave_sb800();
return -EBUSY;
}
outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX);
- smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
+ smba_en_lo = inb_p(SB800_PIIX4_SMB_DATA);
port = adapdata->port;
if ((smba_en_lo & SB800_PIIX4_PORT_IDX_MASK) != port)
outb_p((smba_en_lo & ~SB800_PIIX4_PORT_IDX_MASK) | port,
- SB800_PIIX4_SMB_IDX + 1);
+ SB800_PIIX4_SMB_DATA);
retval = piix4_access(adap, addr, flags, read_write,
command, size, data);
- outb_p(smba_en_lo, SB800_PIIX4_SMB_IDX + 1);
+ outb_p(smba_en_lo, SB800_PIIX4_SMB_DATA);
/* Release the semaphore */
outb_p(smbslvcnt | 0x20, SMBSLVCNT);
- mutex_unlock(&piix4_mutex_sb800);
+ leave_sb800();
return retval;
}
@@ -705,7 +699,6 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
}
adapdata->smba = smba;
- adapdata->sb800_main = sb800_main;
adapdata->port = port << 1;
/* set up the sysfs linkage to our parent device */
@@ -771,29 +764,18 @@ static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
dev->vendor == PCI_VENDOR_ID_AMD) {
is_sb800 = true;
- if (!request_region(SB800_PIIX4_SMB_IDX, 2, "smba_idx")) {
- dev_err(&dev->dev,
- "SMBus base address index region 0x%x already in use!\n",
- SB800_PIIX4_SMB_IDX);
- return -EBUSY;
- }
-
/* base address location etc changed in SB800 */
retval = piix4_setup_sb800(dev, id, 0);
- if (retval < 0) {
- release_region(SB800_PIIX4_SMB_IDX, 2);
+ if (retval < 0)
return retval;
- }
/*
* Try to register multiplexed main SMBus adapter,
* give up if we can't
*/
retval = piix4_add_adapters_sb800(dev, retval);
- if (retval < 0) {
- release_region(SB800_PIIX4_SMB_IDX, 2);
+ if (retval < 0)
return retval;
- }
} else {
retval = piix4_setup(dev, id);
if (retval < 0)
@@ -841,11 +823,8 @@ static void piix4_adap_remove(struct i2c_adapter *adap)
if (adapdata->smba) {
i2c_del_adapter(adap);
- if (adapdata->port == (0 << 1)) {
+ if (adapdata->port == (0 << 1))
release_region(adapdata->smba, SMBIOSIZE);
- if (adapdata->sb800_main)
- release_region(SB800_PIIX4_SMB_IDX, 2);
- }
kfree(adapdata);
kfree(adap);
}
--
2.9.3