Re: [RFC PATCH] mmc: support background operation

[Jaehoon Chung <jh80.chung@samsung.com>]

Hi

In eMMC spec, if set BKOPS_SUPPORT bit in ext_csd,
BKOPS_EN, BKOPS_STATUS, BKOPS_START and URGENT_BKOPS are supported for default.

So need not to send switch-command for BKOPS_EN when set BKOPS_SUPPORT bit.

Thanks,
Jaehoon Chung

>> There is no code for enabling BKOPS_EN?
>> If host want to handle background operation manually, it needs. 
> 
> Sorry, this code is my mistake...maybe duplicated the HPI patch..
> You means maybe need this code..
>            /*
> +           * Enable BKOPS feature (if supported)
> +           */
> +           if (card->ext_csd.bkops != NULL) {
> +                         /*
> +                         * If card supported BKOPS, default set BKOPS_EN bit.
> +                         * But ensure to enable bkops, need to check enable bit
> +                         */
> +                         if (!card->ext_csd.bkops_en) {
> +                                      err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> +                                                   EXT_CSD_BKOPS_EN, 1, 0);
> +                                      if (err && err != -EBADMSG)
> +                                                   goto free_card;
> +
> +                                      if (err) {
> +                                                   printk(KERN_ERR "%s: Enabling BKOPS failed\n",
> +                                                                mmc_hostname(card->host));
> +                                                   err = 0;
> +                                      } else
> +                                                   card->ext_csd.bkops_en = 1;
> +                         }
> +           }
> +
> 
> I will resend the RFC patch..
> 
> Thank you for comment.
> 
> Best Regards,
> Jaehoon Chung
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