linux-kernel - Re: [PATCH V2 1/2] i2c: i2c-qcom-geni: Store DMA mapping data in geni_i2c

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Date:   Wed, 26 Aug 2020 17:25:52 +0530
From:   Akash Asthana <akashast@...eaurora.org>
To:     Roja Rani Yarubandi <rojay@...eaurora.org>, wsa@...nel.org
Cc:     swboyd@...omium.org, dianders@...omium.org,
        saiprakash.ranjan@...eaurora.org, gregkh@...uxfoundation.org,
        mka@...omium.org, msavaliy@....qualcomm.com, skakit@...eaurora.org,
        rnayak@...eaurora.org, agross@...nel.org,
        bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        sumit.semwal@...aro.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH V2 1/2] i2c: i2c-qcom-geni: Store DMA mapping data in
 geni_i2c_dev struct

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@...eaurora.org>
> ---
> 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

>   	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);
>   	}

-- 
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