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mxs: i2c: Restore speed setting after block reset

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The I2C block reset configures the I2C bus speed to strange value.
Read the I2C speed from the block before reseting the block and
restore it afterwards, so the I2C operates correctly. This issue
can be replicated by doing unsuccessful I2C transfer, after such
transfer finishes, the I2C block clock speed is misconfigured.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
This commit is contained in:
Marek Vasut 2012-11-30 18:17:06 +00:00 committed by Tom Rini
parent aff36ea92e
commit 1e2fc0d19b
1 changed files with 3 additions and 0 deletions
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3
drivers/i2c/mxs_i2c.c
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@ -40,6 +40,7 @@ void mxs_i2c_reset(void)
{
struct mxs_i2c_regs *i2c_regs = (struct mxs_i2c_regs *)MXS_I2C0_BASE;
int ret;
int speed = i2c_get_bus_speed();
ret = mxs_reset_block(&i2c_regs->hw_i2c_ctrl0_reg);
if (ret) {
@ -53,6 +54,8 @@ void mxs_i2c_reset(void)
&i2c_regs->hw_i2c_ctrl1_clr);
writel(I2C_QUEUECTRL_PIO_QUEUE_MODE, &i2c_regs->hw_i2c_queuectrl_set);
i2c_set_bus_speed(speed);
}
void mxs_i2c_setup_read(uint8_t chip, int len)