MXS_I2C_CTRL0
while (readl(i2c->regs + MXS_I2C_CTRL0) & MXS_I2C_CTRL0_RUN) {
writel(cmd, i2c->regs + MXS_I2C_CTRL0);
reg = readl(i2c->regs + MXS_I2C_CTRL0);
writel(reg, i2c->regs + MXS_I2C_CTRL0);
writel(cmd, i2c->regs + MXS_I2C_CTRL0);