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i2c: imx-lpi2c: add generic GPIO recovery for LPI2C

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This adds i2c bus recovery to the lpi2c driver.

Uses the generic recovery function setting the SCL/SDA pads as
GPIO pins and sending 9 clocks to try and recover the bus.

Signed-off-by: Carlos Song <carlos.song@nxp.com>
Reviewed-by: Clark Wang <xiaoning.wang@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
This commit is contained in:
Carlos Song 2024-02-26 13:54:18 +08:00 committed by Andi Shyti
parent 747bdf912e
commit 188542964e
1 changed files with 27 additions and 0 deletions
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27
drivers/i2c/busses/i2c-imx-lpi2c.c
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@ -106,6 +106,7 @@ struct lpi2c_imx_struct {
unsigned int txfifosize;
unsigned int rxfifosize;
enum lpi2c_imx_mode mode;
struct i2c_bus_recovery_info rinfo;
};
static void lpi2c_imx_intctrl(struct lpi2c_imx_struct *lpi2c_imx,
@ -133,6 +134,8 @@ static int lpi2c_imx_bus_busy(struct lpi2c_imx_struct *lpi2c_imx)
if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
dev_dbg(&lpi2c_imx->adapter.dev, "bus not work\n");
if (lpi2c_imx->adapter.bus_recovery_info)
i2c_recover_bus(&lpi2c_imx->adapter);
return -ETIMEDOUT;
}
schedule();
@ -190,6 +193,8 @@ static void lpi2c_imx_stop(struct lpi2c_imx_struct *lpi2c_imx)
if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
dev_dbg(&lpi2c_imx->adapter.dev, "stop timeout\n");
if (lpi2c_imx->adapter.bus_recovery_info)
i2c_recover_bus(&lpi2c_imx->adapter);
break;
}
schedule();
@ -325,6 +330,8 @@ static int lpi2c_imx_txfifo_empty(struct lpi2c_imx_struct *lpi2c_imx)
if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
dev_dbg(&lpi2c_imx->adapter.dev, "txfifo empty timeout\n");
if (lpi2c_imx->adapter.bus_recovery_info)
i2c_recover_bus(&lpi2c_imx->adapter);
return -ETIMEDOUT;
}
schedule();
@ -526,6 +533,20 @@ static irqreturn_t lpi2c_imx_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
static int lpi2c_imx_init_recovery_info(struct lpi2c_imx_struct *lpi2c_imx,
struct platform_device *pdev)
{
struct i2c_bus_recovery_info *bri = &lpi2c_imx->rinfo;
bri->pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR(bri->pinctrl))
return PTR_ERR(bri->pinctrl);
lpi2c_imx->adapter.bus_recovery_info = bri;
return 0;
}
static u32 lpi2c_imx_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
@ -600,6 +621,12 @@ static int lpi2c_imx_probe(struct platform_device *pdev)
lpi2c_imx->txfifosize = 1 << (temp & 0x0f);
lpi2c_imx->rxfifosize = 1 << ((temp >> 8) & 0x0f);
/* Init optional bus recovery function */
ret = lpi2c_imx_init_recovery_info(lpi2c_imx, pdev);
/* Give it another chance if pinctrl used is not ready yet */
if (ret == -EPROBE_DEFER)
goto rpm_disable;
ret = i2c_add_adapter(&lpi2c_imx->adapter);
if (ret)
goto rpm_disable;