From 3b43cd6f2dcbf871b8cabe16ae4ac8c036c959ac Mon Sep 17 00:00:00 2001 From: Sekhar Nori Date: Tue, 12 Jan 2010 18:55:35 +0530 Subject: 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 Signed-off-by: Kevin Hilman --- arch/arm/mach-davinci/cdce949.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'arch/arm/mach-davinci/cdce949.c') 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, -- cgit v1.2.2