diff options
| -rw-r--r-- | hw/i2c/pm_smbus.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/hw/i2c/pm_smbus.c b/hw/i2c/pm_smbus.c index 6322f070be..91ee444590 100644 --- a/hw/i2c/pm_smbus.c +++ b/hw/i2c/pm_smbus.c @@ -80,9 +80,6 @@ static void smb_transaction(PMSMBus *s) I2CBus *bus = s->smbus; int ret; - assert(s->smb_stat & STS_HOST_BUSY); - s->smb_stat &= ~STS_HOST_BUSY; - SMBUS_DPRINTF("SMBus trans addr=0x%02x prot=0x%02x\n", addr, prot); /* Transaction isn't exec if STS_DEV_ERR bit set */ if ((s->smb_stat & STS_DEV_ERR) != 0) { @@ -209,9 +206,18 @@ error: static void smb_transaction_start(PMSMBus *s) { - /* Do not execute immediately the command ; it will be - * executed when guest will read SMB_STAT register */ - s->smb_stat |= STS_HOST_BUSY; + if (s->smb_ctl & CTL_INTREN) { + smb_transaction(s); + } else { + /* Do not execute immediately the command; it will be + * executed when guest will read SMB_STAT register. This + * is to work around a bug in AMIBIOS (that is working + * around another bug in some specific hardware) where + * it waits for STS_HOST_BUSY to be set before waiting + * checking for status. If STS_HOST_BUSY doesn't get + * set, it gets stuck. */ + s->smb_stat |= STS_HOST_BUSY; + } } static bool @@ -330,6 +336,7 @@ static uint64_t smb_ioport_readb(void *opaque, hwaddr addr, unsigned width) val = s->smb_stat; if (s->smb_stat & STS_HOST_BUSY) { /* execute command now */ + s->smb_stat &= ~STS_HOST_BUSY; smb_transaction(s); } break; |