Messages in this thread Patch in this message | | | From | Mika Westerberg <> | Subject | [PATCH 1/4] i2c: designware: No need to disable already disabled controller | Date | Thu, 15 May 2014 17:37:21 +0300 |
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If the controller is already in desired state (enabled/disabled) there is no point in setting its state again.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> --- drivers/i2c/busses/i2c-designware-core.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c index b58ecf19e767..b0792675b970 100644 --- a/drivers/i2c/busses/i2c-designware-core.c +++ b/drivers/i2c/busses/i2c-designware-core.c @@ -258,6 +258,10 @@ static void __i2c_dw_enable(struct dw_i2c_dev *dev, bool enable) { int timeout = 100; + /* In case the controller is already in desired state */ + if ((dw_readl(dev, DW_IC_ENABLE_STATUS) & 1) == enable) + return; + do { dw_writel(dev, enable, DW_IC_ENABLE); if ((dw_readl(dev, DW_IC_ENABLE_STATUS) & 1) == enable) -- 2.0.0.rc2
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