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Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 

Pull i2c bugfixes from Wolfram Sang:
 "Two bugfixes (proper IO mapping and use of mutex) for a driver feature
  we introduced in this cycle"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: piix4: Request the SMBUS semaphore inside the mutex
  i2c: piix4: Fix request_region size
This commit is contained in:
Linus Torvalds 2017-02-10 14:39:08 -08:00
parent fc6f41ba8b bbb27fc33d
commit aca9fa0c8d
1 changed files with 8 additions and 6 deletions
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14
drivers/i2c/busses/i2c-piix4.c
View File

@ -58,7 +58,7 @@
#define SMBSLVDAT (0xC + piix4_smba)
/* count for request_region */
#define SMBIOSIZE 8
#define SMBIOSIZE 9
/* PCI Address Constants */
#define SMBBA 0x090
@ -592,6 +592,8 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
u8 port;
int retval;
mutex_lock(&piix4_mutex_sb800);
/* Request the SMBUS semaphore, avoid conflicts with the IMC */
smbslvcnt = inb_p(SMBSLVCNT);
do {
@ -605,10 +607,10 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
usleep_range(1000, 2000);
} while (--retries);
/* SMBus is still owned by the IMC, we give up */
if (!retries)
if (!retries) {
mutex_unlock(&piix4_mutex_sb800);
return -EBUSY;
mutex_lock(&piix4_mutex_sb800);
}
outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX);
smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
@ -623,11 +625,11 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
outb_p(smba_en_lo, SB800_PIIX4_SMB_IDX + 1);
mutex_unlock(&piix4_mutex_sb800);
/* Release the semaphore */
outb_p(smbslvcnt | 0x20, SMBSLVCNT);
mutex_unlock(&piix4_mutex_sb800);
return retval;
}