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| author | Sonic Zhang <sonic.zhang@analog.com> | 2009-05-19 07:21:58 -0400 |
|---|---|---|
| committer | Ben Dooks <ben-linux@fluff.org> | 2009-06-13 10:39:25 +0100 |
| commit | 57a8f32eafa6f36ea3a128e8b13f353c5a3ca9b2 (patch) | |
| tree | af1aaed68c8049c345ca6bfa2b13b66efb73e8a2 /drivers/i2c | |
| parent | 9528d1c7a541b481a0e80301dc8d545848104023 (diff) | |
| download | linux-stable-57a8f32eafa6f36ea3a128e8b13f353c5a3ca9b2.tar.gz linux-stable-57a8f32eafa6f36ea3a128e8b13f353c5a3ca9b2.tar.bz2 linux-stable-57a8f32eafa6f36ea3a128e8b13f353c5a3ca9b2.zip | |
i2c: Blackfin TWI: fix REPEAT START mode doesn't repeat
Avoid rewrite TWI MASTER_CTL reg when issue next message
In i2c repeat transfer mode, byte count of next message should be filled
into part of the TWI MASTER_CTL reg when interrupt MCOMP of last
message transfer is triggered. But, other bits in this reg should
not be touched.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
[ben-linux@fluff.org: shorted subject]
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-bfin-twi.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/i2c/busses/i2c-bfin-twi.c b/drivers/i2c/busses/i2c-bfin-twi.c index 77cafb6ba923..4d73ad7b5703 100644 --- a/drivers/i2c/busses/i2c-bfin-twi.c +++ b/drivers/i2c/busses/i2c-bfin-twi.c @@ -196,8 +196,6 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface) /* remove restart bit and enable master receive */ write_MASTER_CTL(iface, read_MASTER_CTL(iface) & ~RSTART); - write_MASTER_CTL(iface, - read_MASTER_CTL(iface) | MEN | MDIR); SSYNC(); } else if (iface->cur_mode == TWI_I2C_MODE_REPEAT && iface->cur_msg+1 < iface->msg_num) { @@ -222,18 +220,19 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface) } if (iface->pmsg[iface->cur_msg].len <= 255) - write_MASTER_CTL(iface, - iface->pmsg[iface->cur_msg].len << 6); + write_MASTER_CTL(iface, + (read_MASTER_CTL(iface) & + (~(0xff << 6))) | + (iface->pmsg[iface->cur_msg].len << 6)); else { - write_MASTER_CTL(iface, 0xff << 6); + write_MASTER_CTL(iface, + (read_MASTER_CTL(iface) | + (0xff << 6))); iface->manual_stop = 1; } /* remove restart bit and enable master receive */ write_MASTER_CTL(iface, read_MASTER_CTL(iface) & ~RSTART); - write_MASTER_CTL(iface, read_MASTER_CTL(iface) | - MEN | ((iface->read_write == I2C_SMBUS_READ) ? - MDIR : 0)); SSYNC(); } else { iface->result = 1; |