Re: [PATCH V2 1/2] i2c: i2c-qcom-geni: Store DMA mapping data in geni_i2c_dev struct

[rojay@xxxxxxxxxxxxxx]

On 2020-08-26 17:25, Akash Asthana wrote:
> Hi Roja,
>
> On 8/20/2020 4:05 PM, Roja Rani Yarubandi wrote:
> > Store DMA mapping data in geni_i2c_dev struct to enhance DMA mapping
> > data scope. For example during shutdown callback to unmap DMA mapping,
> > this stored DMA mapping data can be used to call geni_se_tx_dma_unprep
> > and geni_se_rx_dma_unprep functions.
> >
> > Signed-off-by: Roja Rani Yarubandi <rojay@xxxxxxxxxxxxxx>
> > ---
> > Changes in V2:
> >   - As per Stephen's comments, changed commit text, fixed minor 
> > nitpicks.
> >
> >   drivers/i2c/busses/i2c-qcom-geni.c | 7 +++++++
> >   1 file changed, 7 insertions(+)
> >
> > diff --git a/drivers/i2c/busses/i2c-qcom-geni.c 
> > b/drivers/i2c/busses/i2c-qcom-geni.c
> > index 7f130829bf01..1fda5c7c2cfc 100644
> > --- a/drivers/i2c/busses/i2c-qcom-geni.c
> > +++ b/drivers/i2c/busses/i2c-qcom-geni.c
> > @@ -86,6 +86,9 @@ struct geni_i2c_dev {
> >   	u32 clk_freq_out;
> >   	const struct geni_i2c_clk_fld *clk_fld;
> >   	int suspended;
> > +	dma_addr_t tx_dma;
> > +	dma_addr_t rx_dma;
> > +	size_t xfer_len;
> >   };
> >     struct geni_i2c_err_log {
> > @@ -358,6 +361,7 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev 
> > *gi2c, struct i2c_msg *msg,
> >   	struct geni_se *se = &gi2c->se;
> >   	size_t len = msg->len;
> >   +	gi2c->xfer_len = msg->len;
>
> nit: gi2c->xfer = len, for tx_one_msg as well.
>
> Regards,
>
> Akash

Okay

> >   	if (!of_machine_is_compatible("lenovo,yoga-c630"))
> >   		dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
> >   @@ -384,6 +388,7 @@ static int geni_i2c_rx_one_msg(struct 
> > geni_i2c_dev *gi2c, struct i2c_msg *msg,
> >   	if (dma_buf) {
> >   		if (gi2c->err)
> >   			geni_i2c_rx_fsm_rst(gi2c);
> > +		gi2c->rx_dma = rx_dma;
> >   		geni_se_rx_dma_unprep(se, rx_dma, len);
> >   		i2c_put_dma_safe_msg_buf(dma_buf, msg, !gi2c->err);
> >   	}
> > @@ -400,6 +405,7 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev 
> > *gi2c, struct i2c_msg *msg,
> >   	struct geni_se *se = &gi2c->se;
> >   	size_t len = msg->len;
> >   +	gi2c->xfer_len = msg->len;
> >   	if (!of_machine_is_compatible("lenovo,yoga-c630"))
> >   		dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
> >   @@ -429,6 +435,7 @@ static int geni_i2c_tx_one_msg(struct 
> > geni_i2c_dev *gi2c, struct i2c_msg *msg,
> >   	if (dma_buf) {
> >   		if (gi2c->err)
> >   			geni_i2c_tx_fsm_rst(gi2c);
> > +		gi2c->tx_dma = tx_dma;
> >   		geni_se_tx_dma_unprep(se, tx_dma, len);
> >   		i2c_put_dma_safe_msg_buf(dma_buf, msg, !gi2c->err);
> >   	}