Quoting Roja Rani Yarubandi (2020-08-14 02:55:39)
> Adding tx_dma, rx_dma and xfer length in geni_i2c_dev struct to
> store DMA mapping data to enhance its scope. For example during
> shutdown callback to unmap DMA mapping, these new struct members
> can be used as part of geni_se_tx_dma_unprep and
> geni_se_rx_dma_unprep calls.
Please read about how to write commit text from kernel docs[1]. Hint,
use imperative mood.
>
> Signed-off-by: Roja Rani Yarubandi <rojay@xxxxxxxxxxxxxx>
> ---
> drivers/i2c/busses/i2c-qcom-geni.c | 23 +++++++++++++----------
> 1 file changed, 13 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
> index 7f130829bf01..53ca41f76080 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;
> + u32 xfer_len;
Why not size_t?
> };
>
> struct geni_i2c_err_log {
> @@ -352,12 +355,11 @@ static void geni_i2c_tx_fsm_rst(struct geni_i2c_dev *gi2c)
> static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
> u32 m_param)
> {
> - dma_addr_t rx_dma;
> unsigned long time_left;
> void *dma_buf = NULL;
> struct geni_se *se = &gi2c->se;
> - size_t len = msg->len;
>
> + gi2c->xfer_len = msg->len;
I'd prefer to keep the local variable and then have
len = gi2c->xfer_len = msg->len;
> if (!of_machine_is_compatible("lenovo,yoga-c630"))
> dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
>
> @@ -366,9 +368,10 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
> else
> geni_se_select_mode(se, GENI_SE_FIFO);
>
> - writel_relaxed(len, se->base + SE_I2C_RX_TRANS_LEN);
> + writel_relaxed(gi2c->xfer_len, se->base + SE_I2C_RX_TRANS_LEN);
So that all this doesn't have to change.
>
> - if (dma_buf && geni_se_rx_dma_prep(se, dma_buf, len, &rx_dma)) {
> + if (dma_buf && geni_se_rx_dma_prep(se, dma_buf, gi2c->xfer_len,
> + &gi2c->rx_dma)) {
> geni_se_select_mode(se, GENI_SE_FIFO);
> i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
> dma_buf = NULL;
> @@ -384,7 +387,7 @@ 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);
> - geni_se_rx_dma_unprep(se, rx_dma, len);
> + geni_se_rx_dma_unprep(se, gi2c->rx_dma, gi2c->xfer_len);
> i2c_put_dma_safe_msg_buf(dma_buf, msg, !gi2c->err);
> }
>
> @@ -394,12 +397,11 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
> static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
> u32 m_param)
> {
> - dma_addr_t tx_dma;
> unsigned long time_left;
> void *dma_buf = NULL;
> struct geni_se *se = &gi2c->se;
> - size_t len = msg->len;
>
> + gi2c->xfer_len = msg->len;
Same comment.
> if (!of_machine_is_compatible("lenovo,yoga-c630"))
> dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
>
[1] https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
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