Re: [PATCH v1] mmc: block: Disable CMDQ on the ioctl path

[Adrian Hunter]

On 4/05/21 11:32 pm, Bean Huo wrote:
> From: Bean Huo <beanhuo@xxxxxxxxxx>
> 
> According to the eMMC Spec:
> "When command queuing is enabled (CMDQ Mode En bit in CMDQ_MODE_EN
> field is set to ‘1’) class 11 commands are the only method through
> which data transfer tasks can be issued. Existing data transfer
> commands, namely CMD18/CMD17 and CMD25/CMD24, are not supported when
> command queuing is enabled."
> which means if CMDQ is enabled, the FFU commands will not be supported.
> To fix this issue, just simply disable CMDQ on the ioctl path, and
> re-enable CMDQ once ioctl request is completed.
> 
> Tested-by: Michael Brunner <Michael.Brunner@xxxxxxxxxxx>
> Signed-off-by: Bean Huo <beanhuo@xxxxxxxxxx>

Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>

> ---
>  drivers/mmc/core/block.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index 689eb9afeeed..21fb99883b1e 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -1004,6 +1004,11 @@ static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
>  
>  	switch (mq_rq->drv_op) {
>  	case MMC_DRV_OP_IOCTL:
> +		if (card->ext_csd.cmdq_en) {
> +			ret = mmc_cmdq_disable(card);
> +			if (ret)
> +				break;
> +		}
>  	case MMC_DRV_OP_IOCTL_RPMB:
>  		idata = mq_rq->drv_op_data;
>  		for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) {
> @@ -1014,6 +1019,8 @@ static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
>  		/* Always switch back to main area after RPMB access */
>  		if (rpmb_ioctl)
>  			mmc_blk_part_switch(card, 0);
> +		else if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
> +			mmc_cmdq_enable(card);
>  		break;
>  	case MMC_DRV_OP_BOOT_WP:
>  		ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
>