Hi, Prasanna.
Why do you use MMC_CAP2_BKOPS_EN?
Maybe we had discussed about this point. i know that we can enable the BKOPS with the mmc-util.
(Actually, This code had included into my first patch. but it's removed.)
Best Regards,
Jaehoon Chung
On 08/30/2013 09:09 PM, Prasanna NAVARATNA wrote:
>>From d596be94f87b86ccb372a4ae55ee478951524895 Mon Sep 17 00:00:00 2001
> From: Prasanna NAVARATNA <prasanna.navaratna@xxxxxxxxxxxx>
> Date: Fri, 30 Aug 2013 17:18:32 +0530
> Subject: [PATCH] mmc: enable BKOPS for supported eMMC(4.41)
>
> BKOPS feature is optional for eMMC 4.41. If an eMMC supports BKOPS
> and is of version 4.41 then BKOPS feature is ignored and not enabled.
>
> Enable BKOPS for such eMMC. Also a capability is added to control
> the enabling of feature (only for eMMC 4.41, not valid for 4.5)
>
> Signed-off-by: Prasanna NAVARATNA <prasanna.navaratna@xxxxxxxxxxxx>
> ---
> drivers/mmc/core/mmc.c | 18 ++++++++++++++++++
> include/linux/mmc/host.h | 1 +
> 2 files changed, 19 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 6d02012..fc44fd7 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1269,6 +1269,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> }
>
> /*
> + * Enable BKOPS feature (if supported and not enabled)
> + */
> + if (!card->ext_csd.bkops_en && (host->caps2 & MMC_CAP2_BKOPS_EN) &&
> + (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1)) {
> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + EXT_CSD_BKOPS_EN, 1,
> + card->ext_csd.generic_cmd6_time);
> + if (err && err != -EBADMSG)
> + goto free_card;
> + if (err) {
> + pr_warning("%s: Enabling BKOPS failed\n",
> + mmc_hostname(card->host));
> + err = 0;
> + } else
> + card->ext_csd.bkops_en = 1;
> + }
> +
> + /*
> * Enable HPI feature (if supported)
> */
> if (card->ext_csd.hpi) {
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index 3b0c33a..2c79487 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -281,6 +281,7 @@ struct mmc_host {
> MMC_CAP2_PACKED_WR)
> #define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before scan */
> #define MMC_CAP2_SANITIZE (1 << 15) /* Support Sanitize */
> +#define MMC_CAP2_BKOPS_EN (1 << 16) /* Enable BKOPS */
>
> mmc_pm_flag_t pm_caps; /* supported pm features */
>
>
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