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| author | Domen Puncer <domen.puncer@ultra.si> | 2006-08-13 23:35:40 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-09-26 15:38:50 -0700 |
| commit | 8859942ede8154c1e90e3b0d1b60aecf0cfaa169 (patch) | |
| tree | b71e1447c4bce6ce4b7dfca581430cacdfc95533 | |
| parent | 643bd3fbd9dc73ed3dc1e4f6980e6f15fdbb9bb6 (diff) | |
| download | op-kernel-dev-8859942ede8154c1e90e3b0d1b60aecf0cfaa169.zip op-kernel-dev-8859942ede8154c1e90e3b0d1b60aecf0cfaa169.tar.gz | |
i2c-au1550: Fix timeout problem
i2c-au1550: Fix timeout problem
Fix from Jordan Crouse:
If the transmit and recieve FIFOS are not empty, forceably flush them
rather then waiting for them to drain on their own.
This solves at least a problem reported by Clem Taylor:
http://www.linux-mips.org/archives/linux-mips/2006-05/msg00240.html
(1% of I2C transactions would timeout)
Signed-off-by: Domen Puncer <domen.puncer@ultra.si>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/i2c/busses/i2c-au1550.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-au1550.c b/drivers/i2c/busses/i2c-au1550.c index d06edce..02a359e 100644 --- a/drivers/i2c/busses/i2c-au1550.c +++ b/drivers/i2c/busses/i2c-au1550.c @@ -118,13 +118,19 @@ do_address(struct i2c_au1550_data *adap, unsigned int addr, int rd) /* Reset the FIFOs, clear events. */ - sp->psc_smbpcr = PSC_SMBPCR_DC; + stat = sp->psc_smbstat; sp->psc_smbevnt = PSC_SMBEVNT_ALLCLR; au_sync(); - do { - stat = sp->psc_smbpcr; + + if (!(stat & PSC_SMBSTAT_TE) || !(stat & PSC_SMBSTAT_RE)) { + sp->psc_smbpcr = PSC_SMBPCR_DC; au_sync(); - } while ((stat & PSC_SMBPCR_DC) != 0); + do { + stat = sp->psc_smbpcr; + au_sync(); + } while ((stat & PSC_SMBPCR_DC) != 0); + udelay(50); + } /* Write out the i2c chip address and specify operation */ |
