| Message ID | 1554208560-14817-5-git-send-email-qii.wang@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | add i2c support for mt8183 | expand |
On 02/04/2019 14:35, Qii Wang wrote: > When i2c and apdma use different source clocks, we should enable > synchronization between them. > > Signed-off-by: Qii Wang <qii.wang@mediatek.com> > Reviewed-by: Nicolas Boichat <drinkcat@chromium.org> > --- > drivers/i2c/busses/i2c-mt65xx.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> > diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c > index 1a7235e..6137ad7 100644 > --- a/drivers/i2c/busses/i2c-mt65xx.c > +++ b/drivers/i2c/busses/i2c-mt65xx.c > @@ -77,6 +77,8 @@ > #define I2C_CONTROL_DIR_CHANGE (0x1 << 4) > #define I2C_CONTROL_ACKERR_DET_EN (0x1 << 5) > #define I2C_CONTROL_TRANSFER_LEN_CHANGE (0x1 << 6) > +#define I2C_CONTROL_DMAACK_EN (0x1 << 8) > +#define I2C_CONTROL_ASYNC_MODE (0x1 << 9) > #define I2C_CONTROL_WRAPPER (0x1 << 0) > > #define I2C_DRV_NAME "i2c-mt65xx" > @@ -169,6 +171,7 @@ struct mtk_i2c_compatible { > unsigned char aux_len_reg: 1; > unsigned char support_33bits: 1; > unsigned char timing_adjust: 1; > + unsigned char dma_sync: 1; > }; > > struct mtk_i2c { > @@ -218,6 +221,7 @@ struct mtk_i2c { > .aux_len_reg = 1, > .support_33bits = 1, > .timing_adjust = 1, > + .dma_sync = 0, > }; > > static const struct mtk_i2c_compatible mt6577_compat = { > @@ -229,6 +233,7 @@ struct mtk_i2c { > .aux_len_reg = 0, > .support_33bits = 0, > .timing_adjust = 0, > + .dma_sync = 0, > }; > > static const struct mtk_i2c_compatible mt6589_compat = { > @@ -240,6 +245,7 @@ struct mtk_i2c { > .aux_len_reg = 0, > .support_33bits = 0, > .timing_adjust = 0, > + .dma_sync = 0, > }; > > static const struct mtk_i2c_compatible mt7622_compat = { > @@ -251,6 +257,7 @@ struct mtk_i2c { > .aux_len_reg = 1, > .support_33bits = 0, > .timing_adjust = 0, > + .dma_sync = 0, > }; > > static const struct mtk_i2c_compatible mt8173_compat = { > @@ -261,6 +268,7 @@ struct mtk_i2c { > .aux_len_reg = 1, > .support_33bits = 1, > .timing_adjust = 0, > + .dma_sync = 0, > }; > > static const struct of_device_id mtk_i2c_of_match[] = { > @@ -360,6 +368,9 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c) > > control_reg = I2C_CONTROL_ACKERR_DET_EN | > I2C_CONTROL_CLK_EXT_EN | I2C_CONTROL_DMA_EN; > + if (i2c->dev_comp->dma_sync) > + control_reg |= I2C_CONTROL_DMAACK_EN | I2C_CONTROL_ASYNC_MODE; > + > mtk_i2c_writew(i2c, control_reg, OFFSET_CONTROL); > mtk_i2c_writew(i2c, I2C_DELAY_LEN, OFFSET_DELAY_LEN); > >
diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index 1a7235e..6137ad7 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -77,6 +77,8 @@ #define I2C_CONTROL_DIR_CHANGE (0x1 << 4) #define I2C_CONTROL_ACKERR_DET_EN (0x1 << 5) #define I2C_CONTROL_TRANSFER_LEN_CHANGE (0x1 << 6) +#define I2C_CONTROL_DMAACK_EN (0x1 << 8) +#define I2C_CONTROL_ASYNC_MODE (0x1 << 9) #define I2C_CONTROL_WRAPPER (0x1 << 0) #define I2C_DRV_NAME "i2c-mt65xx" @@ -169,6 +171,7 @@ struct mtk_i2c_compatible { unsigned char aux_len_reg: 1; unsigned char support_33bits: 1; unsigned char timing_adjust: 1; + unsigned char dma_sync: 1; }; struct mtk_i2c { @@ -218,6 +221,7 @@ struct mtk_i2c { .aux_len_reg = 1, .support_33bits = 1, .timing_adjust = 1, + .dma_sync = 0, }; static const struct mtk_i2c_compatible mt6577_compat = { @@ -229,6 +233,7 @@ struct mtk_i2c { .aux_len_reg = 0, .support_33bits = 0, .timing_adjust = 0, + .dma_sync = 0, }; static const struct mtk_i2c_compatible mt6589_compat = { @@ -240,6 +245,7 @@ struct mtk_i2c { .aux_len_reg = 0, .support_33bits = 0, .timing_adjust = 0, + .dma_sync = 0, }; static const struct mtk_i2c_compatible mt7622_compat = { @@ -251,6 +257,7 @@ struct mtk_i2c { .aux_len_reg = 1, .support_33bits = 0, .timing_adjust = 0, + .dma_sync = 0, }; static const struct mtk_i2c_compatible mt8173_compat = { @@ -261,6 +268,7 @@ struct mtk_i2c { .aux_len_reg = 1, .support_33bits = 1, .timing_adjust = 0, + .dma_sync = 0, }; static const struct of_device_id mtk_i2c_of_match[] = { @@ -360,6 +368,9 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c) control_reg = I2C_CONTROL_ACKERR_DET_EN | I2C_CONTROL_CLK_EXT_EN | I2C_CONTROL_DMA_EN; + if (i2c->dev_comp->dma_sync) + control_reg |= I2C_CONTROL_DMAACK_EN | I2C_CONTROL_ASYNC_MODE; + mtk_i2c_writew(i2c, control_reg, OFFSET_CONTROL); mtk_i2c_writew(i2c, I2C_DELAY_LEN, OFFSET_DELAY_LEN);