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Merge branch 'for-2638/i2c/bfin2' into for-linus/i2c-2638

hifive-unleashed-5.1
Ben Dooks 2011-01-12 22:26:12 +00:00
parent adeaf46d31 74f56c4ad4
commit dad92924ea
1 changed files with 23 additions and 1 deletions
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24
drivers/i2c/busses/i2c-bfin-twi.c
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@ -20,6 +20,7 @@
#include <linux/completion.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <asm/blackfin.h>
#include <asm/portmux.h>
@ -159,6 +160,27 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface,
if (mast_stat & BUFWRERR)
dev_dbg(&iface->adap.dev, "Buffer Write Error\n");
/* Faulty slave devices, may drive SDA low after a transfer
* finishes. To release the bus this code generates up to 9
* extra clocks until SDA is released.
*/
if (read_MASTER_STAT(iface) & SDASEN) {
int cnt = 9;
do {
write_MASTER_CTL(iface, SCLOVR);
udelay(6);
write_MASTER_CTL(iface, 0);
udelay(6);
} while ((read_MASTER_STAT(iface) & SDASEN) && cnt--);
write_MASTER_CTL(iface, SDAOVR | SCLOVR);
udelay(6);
write_MASTER_CTL(iface, SDAOVR);
udelay(6);
write_MASTER_CTL(iface, 0);
}
/* If it is a quick transfer, only address without data,
* not an err, return 1.
*/
@ -760,7 +782,7 @@ static void __exit i2c_bfin_twi_exit(void)
platform_driver_unregister(&i2c_bfin_twi_driver);
}
module_init(i2c_bfin_twi_init);
subsys_initcall(i2c_bfin_twi_init);
module_exit(i2c_bfin_twi_exit);
MODULE_AUTHOR("Bryan Wu, Sonic Zhang");