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From: Shawn Lin <shawn.lin@rock-chips.com>
To: Ulf Hansson <ulf.hansson@linaro.org>,
	linux-mmc@vger.kernel.org,
	Adrian Hunter <adrian.hunter@intel.com>
Cc: shawn.lin@rock-chips.com,
	Linus Walleij <linus.walleij@linaro.org>,
	Wolfram Sang <wsa+renesas@sang-engineering.com>,
	Avri Altman <avri.altman@wdc.com>,
	Masami Hiramatsu <masami.hiramatsu@linaro.org>,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 08/11] mmc: core: Parse the SD SCR register for support of CMD48/49 and CMD58/59
Date: Fri, 7 May 2021 09:58:24 +0800	[thread overview]
Message-ID: <3590da3a-046d-3fd4-42e2-238fcb6751ab@rock-chips.com> (raw)
In-Reply-To: <20210504161222.101536-9-ulf.hansson@linaro.org>


On 2021/5/5 0:12, Ulf Hansson wrote:
> In SD spec v4.x the support for CMD48/49 and CMD58/59 were introduced as
> optional features. To let the card announce whether it supports the
> commands, the SCR register has been extended with corresponding support
> bits. Let's parse and store this information for later use.
> 

Just check v4.0 spec, and it says

"Table 4-32 is added in Version 4.00. These commands are reserved for
future extenstion". So,

Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>

> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
>   drivers/mmc/core/sd.c    | 4 +++-
>   include/linux/mmc/card.h | 2 ++
>   2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
> index 2c48d6504101..de7b5f8df550 100644
> --- a/drivers/mmc/core/sd.c
> +++ b/drivers/mmc/core/sd.c
> @@ -222,7 +222,9 @@ static int mmc_decode_scr(struct mmc_card *card)
>   	else
>   		card->erased_byte = 0x0;
>   
> -	if (scr->sda_spec3)
> +	if (scr->sda_spec4)
> +		scr->cmds = UNSTUFF_BITS(resp, 32, 4);
> +	else if (scr->sda_spec3)
>   		scr->cmds = UNSTUFF_BITS(resp, 32, 2);
>   
>   	/* SD Spec says: any SD Card shall set at least bits 0 and 2 */
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index f9ad35dd6012..858fc4d11240 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -139,6 +139,8 @@ struct sd_scr {
>   	unsigned char		cmds;
>   #define SD_SCR_CMD20_SUPPORT   (1<<0)
>   #define SD_SCR_CMD23_SUPPORT   (1<<1)
> +#define SD_SCR_CMD48_SUPPORT   (1<<2)
> +#define SD_SCR_CMD58_SUPPORT   (1<<3)
>   };
>   
>   struct sd_ssr {
> 



  parent reply	other threads:[~2021-05-07  1:58 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-04 16:12 [PATCH 00/11] Initital support for new power/perf features for SD cards Ulf Hansson
2021-05-04 16:12 ` [PATCH 01/11] mmc: core: Drop open coding when preparing commands with busy signaling Ulf Hansson
2021-05-06 12:50   ` Linus Walleij
2021-05-07  1:42   ` Shawn Lin
2021-05-04 16:12 ` [PATCH 02/11] mmc: core: Take into account MMC_CAP_NEED_RSP_BUSY for eMMC HPI commands Ulf Hansson
2021-05-06 12:51   ` Linus Walleij
2021-05-07  1:44   ` Shawn Lin
2021-05-04 16:12 ` [PATCH 03/11] mmc: core: Re-structure some code in __mmc_poll_for_busy() Ulf Hansson
2021-05-06 12:52   ` Linus Walleij
2021-05-07  1:48   ` Shawn Lin
2021-05-04 16:12 ` [PATCH 04/11] mmc: core: Extend re-use of __mmc_poll_for_busy() Ulf Hansson
2021-05-06 12:53   ` Linus Walleij
2021-05-07  1:51   ` Shawn Lin
2021-05-04 16:12 ` [PATCH 05/11] mmc: core: Enable eMMC sleep commands to use HW busy polling Ulf Hansson
2021-05-06 12:55   ` Linus Walleij
2021-05-07  1:52   ` Shawn Lin
2021-05-04 16:12 ` [PATCH 06/11] mmc: core: Prepare mmc_send_cxd_data() to be re-used for additional cmds Ulf Hansson
2021-05-06 12:56   ` Linus Walleij
2021-05-06 13:00   ` Linus Walleij
2021-05-07  7:30     ` Ulf Hansson
2021-05-07  1:53   ` Shawn Lin
2021-05-04 16:12 ` [PATCH 07/11] mmc: core: Drop open coding in mmc_sd_switch() Ulf Hansson
2021-05-06 12:57   ` Linus Walleij
2021-05-07  1:54   ` Shawn Lin
2021-05-04 16:12 ` [PATCH 08/11] mmc: core: Parse the SD SCR register for support of CMD48/49 and CMD58/59 Ulf Hansson
2021-05-06 13:01   ` Linus Walleij
2021-05-07  1:58   ` Shawn Lin [this message]
2021-05-04 16:12 ` [PATCH 09/11] mmc: core: Read the SD function extension registers for power management Ulf Hansson
2021-05-06 13:04   ` Linus Walleij
2021-05-07  2:06   ` Shawn Lin
2021-05-07  7:27     ` Ulf Hansson
2021-05-07  7:48       ` Shawn Lin
2021-05-07 11:36         ` Ulf Hansson
2021-05-04 16:12 ` [PATCH 10/11] mmc: core: Read performance enhancements registers for SD cards Ulf Hansson
2021-05-06 13:05   ` Linus Walleij
2021-05-04 16:12 ` [PATCH 11/11] mmc: core: Add support for Power Off Notification " Ulf Hansson
2021-05-06 13:07   ` Linus Walleij
2021-05-07  6:44 ` [PATCH 00/11] Initital support for new power/perf features " Avri Altman
2021-05-07  7:31   ` Ulf Hansson
2021-05-11 10:56 ` Ulf Hansson

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