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Subject[PATCH] i2c: mediatek: Disable i2c start_en and clear intr_stat brfore reset
Date
From: Qii Wang <qii.wang@mediatek.com>

The i2c controller driver do dma reset after transfer timeout,
but sometimes dma reset will trigger an unexpected DMA_ERR irq.
It will cause the i2c controller to continuously send interrupts
to the system and cause soft lock-up. So we need to disable i2c
start_en and clear intr_stat to stop i2c controller before dma
reset when transfer timeout.

Signed-off-by: Qii Wang <qii.wang@mediatek.com>
---
drivers/i2c/busses/i2c-mt65xx.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
index ea337ba..bfd80b2 100644
--- a/drivers/i2c/busses/i2c-mt65xx.c
+++ b/drivers/i2c/busses/i2c-mt65xx.c
@@ -479,6 +479,11 @@ static void mtk_i2c_clock_disable(struct mtk_i2c *i2c)
static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
{
u16 control_reg;
+ u16 intr_stat_reg;
+
+ mtk_i2c_writew(i2c, I2C_CHN_CLR_FLAG, OFFSET_START);
+ intr_stat_reg = mtk_i2c_readw(i2c, OFFSET_INTR_STAT);
+ mtk_i2c_writew(i2c, intr_stat_reg, OFFSET_INTR_STAT);

if (i2c->dev_comp->apdma_sync) {
writel(I2C_DMA_WARM_RST, i2c->pdmabase + OFFSET_RST);
--
1.9.1
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