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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>
This commit is contained in:
Domen Puncer 2006-08-13 23:35:40 +02:00 committed by Greg Kroah-Hartman
parent 643bd3fbd9
commit 8859942ede
1 changed files with 10 additions and 4 deletions
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14
drivers/i2c/busses/i2c-au1550.c
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@ -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
*/