diff options
| author | Jan Glauber <jglauber@cavium.com> | 2016-12-09 10:31:56 +0100 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2016-12-11 22:59:10 +0100 |
| commit | 38190dfb7056678e388f85cb9c79f8e479a4b263 (patch) | |
| tree | e2e9fa9ed49f6d91bc2459bf50c4e91639e047b7 /drivers/i2c | |
| parent | ccee1a4cdcd02e748d39d2b121f7f82041893121 (diff) | |
| download | linux-38190dfb7056678e388f85cb9c79f8e479a4b263.tar.bz2 | |
i2c: octeon: thunderx: Remove double-check after interrupt
Commit 1bb1ff3e7c74 ("i2c: octeon: Improve performance if interrupt is
early") added a double-check around the wait_event_timeout() condition.
The performance problem that this commit tried to work-around
could not be reproduced. It also makes the wait condition more
complicated then it should be. Therefore remove the double-check.
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-octeon-core.c | 43 |
1 files changed, 2 insertions, 41 deletions
diff --git a/drivers/i2c/busses/i2c-octeon-core.c b/drivers/i2c/busses/i2c-octeon-core.c index 0b020703017d..1d8775799056 100644 --- a/drivers/i2c/busses/i2c-octeon-core.c +++ b/drivers/i2c/busses/i2c-octeon-core.c @@ -36,24 +36,6 @@ static bool octeon_i2c_test_iflg(struct octeon_i2c *i2c) return (octeon_i2c_ctl_read(i2c) & TWSI_CTL_IFLG); } -static bool octeon_i2c_test_ready(struct octeon_i2c *i2c, bool *first) -{ - if (octeon_i2c_test_iflg(i2c)) - return true; - - if (*first) { - *first = false; - return false; - } - - /* - * IRQ has signaled an event but IFLG hasn't changed. - * Sleep and retry once. - */ - usleep_range(I2C_OCTEON_EVENT_WAIT, 2 * I2C_OCTEON_EVENT_WAIT); - return octeon_i2c_test_iflg(i2c); -} - /** * octeon_i2c_wait - wait for the IFLG to be set * @i2c: The struct octeon_i2c @@ -63,7 +45,6 @@ static bool octeon_i2c_test_ready(struct octeon_i2c *i2c, bool *first) static int octeon_i2c_wait(struct octeon_i2c *i2c) { long time_left; - bool first = true; /* * Some chip revisions don't assert the irq in the interrupt @@ -80,7 +61,7 @@ static int octeon_i2c_wait(struct octeon_i2c *i2c) } i2c->int_enable(i2c); - time_left = wait_event_timeout(i2c->queue, octeon_i2c_test_ready(i2c, &first), + time_left = wait_event_timeout(i2c->queue, octeon_i2c_test_iflg(i2c), i2c->adap.timeout); i2c->int_disable(i2c); @@ -102,25 +83,6 @@ static bool octeon_i2c_hlc_test_valid(struct octeon_i2c *i2c) return (__raw_readq(i2c->twsi_base + SW_TWSI(i2c)) & SW_TWSI_V) == 0; } -static bool octeon_i2c_hlc_test_ready(struct octeon_i2c *i2c, bool *first) -{ - /* check if valid bit is cleared */ - if (octeon_i2c_hlc_test_valid(i2c)) - return true; - - if (*first) { - *first = false; - return false; - } - - /* - * IRQ has signaled an event but valid bit isn't cleared. - * Sleep and retry once. - */ - usleep_range(I2C_OCTEON_EVENT_WAIT, 2 * I2C_OCTEON_EVENT_WAIT); - return octeon_i2c_hlc_test_valid(i2c); -} - static void octeon_i2c_hlc_int_clear(struct octeon_i2c *i2c) { /* clear ST/TS events, listen for neither */ @@ -176,7 +138,6 @@ static void octeon_i2c_hlc_disable(struct octeon_i2c *i2c) */ static int octeon_i2c_hlc_wait(struct octeon_i2c *i2c) { - bool first = true; int time_left; /* @@ -195,7 +156,7 @@ static int octeon_i2c_hlc_wait(struct octeon_i2c *i2c) i2c->hlc_int_enable(i2c); time_left = wait_event_timeout(i2c->queue, - octeon_i2c_hlc_test_ready(i2c, &first), + octeon_i2c_hlc_test_valid(i2c), i2c->adap.timeout); i2c->hlc_int_disable(i2c); if (!time_left) |