i2c: imx-lpi2c: check only for enabled interrupt flags

When reading from I2C, the Tx watermark is set to 0. Unfortunately the
TDF (transmit data flag) is enabled when Tx FIFO entries is equal or less
than watermark. So it is set in every case, hence the reset default of 1.
This results in the MSR_RDF _and_ MSR_TDF flags to be set thus trying
to send Tx data on a read message.
Mask the IRQ status to filter for wanted flags only.

Fixes: a55fa9d0e42e ("i2c: imx-lpi2c: add low power i2c bus driver")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Tested-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index c6d0225246e693c8f6d7669c118cf8fd5c3a28fa..a49b14d52a98614bd5745baba5048ec24c43438a 100644 (file)
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -505,10 +505,14 @@ disable:
 static irqreturn_t lpi2c_imx_isr(int irq, void *dev_id)
 {
        struct lpi2c_imx_struct *lpi2c_imx = dev_id;
+       unsigned int enabled;
        unsigned int temp;
 
+       enabled = readl(lpi2c_imx->base + LPI2C_MIER);
+
        lpi2c_imx_intctrl(lpi2c_imx, 0);
        temp = readl(lpi2c_imx->base + LPI2C_MSR);
+       temp &= enabled;
 
        if (temp & MSR_RDF)
                lpi2c_imx_read_rxfifo(lpi2c_imx);