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SubjectRe: [PATCH 05/14] qcom: mtd: nand: allocate bam transaction
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Hi Abhishek,

<..>

> +/* Allocates and Initializes the BAM transaction */
> +static struct bam_transaction *
> +alloc_bam_transaction(struct qcom_nand_controller *nandc, unsigned int num_cw)
> +{
> + struct bam_transaction *bam_txn;
> +
> + bam_txn = devm_kzalloc(nandc->dev, sizeof(*bam_txn), GFP_KERNEL);
> +
> + if (!bam_txn)
> + return NULL;
> +
> + bam_txn->bam_ce =
> + devm_kzalloc(nandc->dev, sizeof(*bam_txn->bam_ce) *
> + num_cw * QPIC_PER_CW_MAX_CMD_ELEMENTS, GFP_KERNEL);
> + if (!bam_txn->bam_ce)
> + return NULL;
> +
> + bam_txn->cmd_sgl =
> + devm_kzalloc(nandc->dev, sizeof(*bam_txn->cmd_sgl) * num_cw *
> + QPIC_PER_CW_MAX_CMD_SGL, GFP_KERNEL);
> + if (!bam_txn->cmd_sgl)
> + return NULL;
> +
> + bam_txn->data_sg =
> + devm_kzalloc(nandc->dev, sizeof(*bam_txn->data_sg) *
> + num_cw * QPIC_PER_CW_MAX_DATA_SGL, GFP_KERNEL);
> + if (!bam_txn->data_sg)
> + return NULL;
> +
> + nandc->max_cwperpage = num_cw;
> +
> + return bam_txn;
> +}
> +
> static inline struct qcom_nand_host *to_qcom_nand_host(struct nand_chip *chip)
> {
> return container_of(chip, struct qcom_nand_host, chip);
> @@ -1868,6 +1958,8 @@ static int qcom_nand_host_setup(struct qcom_nand_host *host)
> mtd_set_ooblayout(mtd, &qcom_nand_ooblayout_ops);
>
> cwperpage = mtd->writesize / ecc->size;
> + nandc->max_cwperpage = max_t(unsigned int, nandc->max_cwperpage,
> + cwperpage);
>
> /*
> * DATA_UD_BYTES varies based on whether the read/write command protects
> @@ -2010,6 +2102,19 @@ static int qcom_nandc_alloc(struct qcom_nand_controller *nandc)
> dev_err(nandc->dev, "failed to request cmd channel\n");
> return -ENODEV;
> }
> +
> + /*
> + * Initially allocate BAM transaction to read ONFI param page.
> + * After detecting all the devices, this BAM transaction will
> + * be freed and the next BAM tranasction will be allocated with
> + * maximum codeword size
> + */
> + nandc->bam_txn = alloc_bam_transaction(nandc, 1);
> + if (!nandc->bam_txn) {
> + dev_err(nandc->dev,
> + "failed to allocate bam transaction\n");
> + return -ENOMEM;
> + }
> }
>
> INIT_LIST_HEAD(&nandc->desc_list);
> @@ -2153,6 +2258,17 @@ static int qcom_probe_nand_devices(struct qcom_nand_controller *nandc)
> if (list_empty(&nandc->host_list))
> return -ENODEV;
>
> + if (nandc->dma_bam_enabled) {
> + free_bam_transaction(nandc);
> + nandc->bam_txn = alloc_bam_transaction(nandc,
> + nandc->max_cwperpage);

Somehow, looks like something is missing because, nandc->max_cwperpage passed from
here is used in alloc_bam_transaction, but it is assigned in the same function ?

Regards,
Sricharan

--
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