diff options
| author | Sekhar Nori <nsekhar@ti.com> | 2010-01-12 14:25:35 +0100 |
|---|---|---|
| committer | Kevin Hilman <khilman@deeprootsystems.com> | 2010-02-04 22:30:08 +0100 |
| commit | 3b43cd6f2dcbf871b8cabe16ae4ac8c036c959ac (patch) | |
| tree | 064252da18333283fc12e088f37b94fc6c74e24e /arch/arm/mach-davinci/cdce949.c | |
| parent | Add SDA and SCL pin numbers to i2c platform data (diff) | |
| download | linux-3b43cd6f2dcbf871b8cabe16ae4ac8c036c959ac.tar.xz linux-3b43cd6f2dcbf871b8cabe16ae4ac8c036c959ac.zip | |
davinci: clock: let clk->set_rate function sleep
When supporting I2C/SPI based on-board PLLs like CDCE949,
it is essential that clk->set_rate be able to sleep.
Currently, this is not possible because clk->set_rate is
called from within spin-lock in clk_set_rate
This patch brings clk->set_rate outside of the spin-lock
and lets the individual set_rate implementations achieve
serialization through appropiate means.
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/arm/mach-davinci/cdce949.c')
| -rw-r--r-- | arch/arm/mach-davinci/cdce949.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/arm/mach-davinci/cdce949.c b/arch/arm/mach-davinci/cdce949.c index 6af3289e0527..aec375690543 100644 --- a/arch/arm/mach-davinci/cdce949.c +++ b/arch/arm/mach-davinci/cdce949.c @@ -23,6 +23,7 @@ #include "clock.h" static struct i2c_client *cdce_i2c_client; +static DEFINE_MUTEX(cdce_mutex); /* CDCE register descriptor */ struct cdce_reg { @@ -231,16 +232,19 @@ int cdce_set_rate(struct clk *clk, unsigned long rate) if (!regs) return -EINVAL; + mutex_lock(&cdce_mutex); for (i = 0; regs[i].addr; i++) { ret = i2c_smbus_write_byte_data(cdce_i2c_client, regs[i].addr | 0x80, regs[i].val); if (ret) - return ret; + break; } + mutex_unlock(&cdce_mutex); - clk->rate = rate; + if (!ret) + clk->rate = rate; - return 0; + return ret; } static int cdce_probe(struct i2c_client *client, |