Re: [PATCH 1/3] i2c: owl: Clear NACK and BUS error bits
From: Manivannan Sadhasivam <hidden>
Date: 2020-10-11 14:10:00
Also in:
linux-i2c, lkml
On Fri, Oct 09, 2020 at 12:44:39AM +0300, Cristian Ciocaltea wrote:
When the NACK and BUS error bits are set by the hardware, the driver is
responsible for clearing them by writing "1" into the corresponding
status registers.
Hence perform the necessary operations in owl_i2c_interrupt().
Fixes: d211e62af466 ("i2c: Add Actions Semiconductor Owl family S900 I2C driver")
Reported-by: Manivannan Sadhasivam <redacted>
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>Reviewed-by: Manivannan Sadhasivam <redacted> Thanks, Mani
quoted hunk ↗ jump to hunk
--- drivers/i2c/busses/i2c-owl.c | 6 ++++++ 1 file changed, 6 insertions(+)diff --git a/drivers/i2c/busses/i2c-owl.c b/drivers/i2c/busses/i2c-owl.c index 672f1f239bd6..a163b8f308c1 100644 --- a/drivers/i2c/busses/i2c-owl.c +++ b/drivers/i2c/busses/i2c-owl.c@@ -176,6 +176,9 @@ static irqreturn_t owl_i2c_interrupt(int irq, void *_dev) fifostat = readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT); if (fifostat & OWL_I2C_FIFOSTAT_RNB) { i2c_dev->err = -ENXIO; + /* Clear NACK error bit by writing "1" */ + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOSTAT, + OWL_I2C_FIFOSTAT_RNB, true); goto stop; }@@ -183,6 +186,9 @@ static irqreturn_t owl_i2c_interrupt(int irq, void *_dev) stat = readl(i2c_dev->base + OWL_I2C_REG_STAT); if (stat & OWL_I2C_STAT_BEB) { i2c_dev->err = -EIO; + /* Clear BUS error bit by writing "1" */ + owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_STAT, + OWL_I2C_STAT_BEB, true); goto stop; }-- 2.28.0
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