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i2c: mediatek: Fix apdma and i2c hand-shake timeout 

With the apdma remove hand-shake signal, it requirs special
operation timing to reset i2c manually, otherwise the interrupt
will not be triggered, i2c transmission will be timeout.

Fixes: 8426fe70cfa4("i2c: mediatek: Add apdma sync in i2c driver")
Signed-off-by: Qii Wang <qii.wang@mediatek.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
zero-sugar-mainline-defconfig
Qii Wang 2020-12-24 20:26:07 +08:00 committed by Wolfram Sang
parent 0b3ea2a06d
commit 05f6f7271a
1 changed files with 22 additions and 5 deletions
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27
drivers/i2c/busses/i2c-mt65xx.c
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@ -38,6 +38,7 @@
#define I2C_IO_CONFIG_OPEN_DRAIN 0x0003
#define I2C_IO_CONFIG_PUSH_PULL 0x0000
#define I2C_SOFT_RST 0x0001
#define I2C_HANDSHAKE_RST 0x0020
#define I2C_FIFO_ADDR_CLR 0x0001
#define I2C_DELAY_LEN 0x0002
#define I2C_TIME_CLR_VALUE 0x0000
@ -45,6 +46,7 @@
#define I2C_WRRD_TRANAC_VALUE 0x0002
#define I2C_RD_TRANAC_VALUE 0x0001
#define I2C_SCL_MIS_COMP_VALUE 0x0000
#define I2C_CHN_CLR_FLAG 0x0000
#define I2C_DMA_CON_TX 0x0000
#define I2C_DMA_CON_RX 0x0001
@ -54,7 +56,9 @@
#define I2C_DMA_START_EN 0x0001
#define I2C_DMA_INT_FLAG_NONE 0x0000
#define I2C_DMA_CLR_FLAG 0x0000
#define I2C_DMA_WARM_RST 0x0001
#define I2C_DMA_HARD_RST 0x0002
#define I2C_DMA_HANDSHAKE_RST 0x0004
#define MAX_SAMPLE_CNT_DIV 8
#define MAX_STEP_CNT_DIV 64
@ -475,11 +479,24 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
{
u16 control_reg;
writel(I2C_DMA_HARD_RST, i2c->pdmabase + OFFSET_RST);
udelay(50);
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);
mtk_i2c_writew(i2c, I2C_SOFT_RST, OFFSET_SOFTRESET);
if (i2c->dev_comp->dma_sync) {
writel(I2C_DMA_WARM_RST, i2c->pdmabase + OFFSET_RST);
udelay(10);
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);
udelay(10);
writel(I2C_DMA_HANDSHAKE_RST | I2C_DMA_HARD_RST,
i2c->pdmabase + OFFSET_RST);
mtk_i2c_writew(i2c, I2C_HANDSHAKE_RST | I2C_SOFT_RST,
OFFSET_SOFTRESET);
udelay(10);
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);
mtk_i2c_writew(i2c, I2C_CHN_CLR_FLAG, OFFSET_SOFTRESET);
} else {
writel(I2C_DMA_HARD_RST, i2c->pdmabase + OFFSET_RST);
udelay(50);
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);
mtk_i2c_writew(i2c, I2C_SOFT_RST, OFFSET_SOFTRESET);
}
/* Set ioconfig */
if (i2c->use_push_pull)