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| author | Gong Qianyu <Qianyu.Gong@freescale.com> | 2015-12-18 17:38:01 +0800 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2016-01-03 16:01:41 +0100 |
| commit | aee3fddb677d86a131d9ac7bac2251f9a6ab2975 (patch) | |
| tree | bc0a20c16b8674dbb2f187e2a3ef51c1943cd2f1 /drivers/i2c | |
| parent | 40f4839ce12adfc0223d6e3035cf9c3a4754a0ec (diff) | |
| download | u-boot-imx-aee3fddb677d86a131d9ac7bac2251f9a6ab2975.zip u-boot-imx-aee3fddb677d86a131d9ac7bac2251f9a6ab2975.tar.gz u-boot-imx-aee3fddb677d86a131d9ac7bac2251f9a6ab2975.tar.bz2 | |
i2c: mxc: add a condition in case the parameter is NULL
This could avoid executing the code that only applies to i.MX platforms.
The bus_i2c_init() is called before relocation and will assgin value
to a static variable. If U-Boot is then still running in a flash
device, it's theoretically not allowed to write data to flash without
an erasing operation. For i.MX platforms, the U-Boot is always running
in DDR.
Actually it causes asynchronous error when the ARM64 system error
report is enabled and the flash write protect is set.
Signed-off-by: Gong Qianyu <Qianyu.Gong@freescale.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/mxc_i2c.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c index fa4c82f..b2d15c9 100644 --- a/drivers/i2c/mxc_i2c.c +++ b/drivers/i2c/mxc_i2c.c @@ -581,8 +581,16 @@ void bus_i2c_init(int index, int speed, int unused, return; } - mxc_i2c_buses[index].idle_bus_fn = idle_bus_fn; - mxc_i2c_buses[index].idle_bus_data = idle_bus_data; + /* + * Warning: Be careful to allow the assignment to a static + * variable here. This function could be called while U-Boot is + * still running in flash memory. So such assignment is equal + * to write data to flash without erasing. + */ + if (idle_bus_fn) + mxc_i2c_buses[index].idle_bus_fn = idle_bus_fn; + if (idle_bus_data) + mxc_i2c_buses[index].idle_bus_data = idle_bus_data; ret = enable_i2c_clk(1, index); if (ret < 0) { |