[U-Boot] [PATCH 1/5] mmc: sd: extracting erase timeout information from sd status

[Peng Fan <van.freenix@gmail.com>]

Hi Jaehoon,

On Fri, Aug 12, 2016 at 11:08:28AM +0900, Jaehoon Chung wrote:
>Hi Peng,
>
>On 08/11/2016 08:00 PM, Peng Fan wrote:
>> Add function to read SD_STATUS information.
>> According to the information, get erase_timeout/erase_size/erase_offset.
>> Add a structure sd_ssr to include the erase related information.
>> 
>> Signed-off-by: Peng Fan <peng.fan@nxp.com>
>> Cc: Jaehoon Chung <jh80.chung@samsung.com>
>> Cc: Simon Glass <sjg@chromium.org>
>> Cc: Bin Meng <bmeng.cn@gmail.com>
>> Cc: Stefan Wahren <stefan.wahren@i2se.com>
>> Cc: Clemens Gruber <clemens.gruber@pqgruber.com>
>> Cc: Kever Yang <kever.yang@rock-chips.com>
>> Cc: Eric Nelson <eric@nelint.com>
>> Cc: Stephen Warren <swarren@nvidia.com>
>> ---
>>  drivers/mmc/mmc.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>  include/mmc.h     |  8 +++++++
>>  2 files changed, 78 insertions(+)
>> 
>> diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
>> index 3daa748..efe517a 100644
>> --- a/drivers/mmc/mmc.c
>> +++ b/drivers/mmc/mmc.c
>> @@ -21,6 +21,13 @@
>>  #include <div64.h>
>>  #include "mmc_private.h"
>>  
>> +static const unsigned int sd_au_size[] = {
>> +	0,		SZ_16K / 512,		SZ_32K / 512,	SZ_64K / 512,
>> +	SZ_128K / 512,	SZ_256K / 512,		SZ_512K / 512,	SZ_1M / 512,
>> +	SZ_2M / 512,	SZ_4M / 512,		SZ_8M / 512,	(SZ_8M + SZ_4M) / 512,
>> +	SZ_16M / 512,	(SZ_16M + SZ_8M) / 512,	SZ_32M / 512,	SZ_64M / 512,
>> +};
>
>WARNING: line over 80 characters
>#37: FILE: drivers/mmc/mmc.c:27:
>+       SZ_2M / 512,    SZ_4M / 512,            SZ_8M / 512,    (SZ_8M + SZ_4M) / 512,

Will fix this in V2.

>
>> +
>>  #ifndef CONFIG_DM_MMC_OPS
>>  __weak int board_mmc_getwp(struct mmc *mmc)
>>  {
>> @@ -942,6 +949,65 @@ retry_scr:
>>  	return 0;
>>  }
>>  
>> +static int sd_read_ssr(struct mmc *mmc)
>> +{
>> +	int err, i;
>> +	struct mmc_cmd cmd;
>> +	ALLOC_CACHE_ALIGN_BUFFER(uint, ssr, 16);
>> +	struct mmc_data data;
>> +	int timeout;
>> +	unsigned int au, eo, et, es;
>> +
>> +	cmd.cmdidx = MMC_CMD_APP_CMD;
>> +	cmd.resp_type = MMC_RSP_R1;
>> +	cmd.cmdarg = mmc->rca << 16;
>> +
>> +	err = mmc_send_cmd(mmc, &cmd, NULL);
>> +	if (err)
>> +		return err;
>> +
>> +	cmd.cmdidx = SD_CMD_APP_SD_STATUS;
>> +	cmd.resp_type = MMC_RSP_R1;
>> +	cmd.cmdarg = 0;
>> +
>> +	timeout = 3;
>
>Don't need to assign at here.

I just follow retry_scr here. You mean there is no need to try more times?

>
>> +
>> +retry_ssr:
>> +	data.dest = (char *)ssr;
>> +	data.blocksize = 64;
>> +	data.blocks = 1;
>> +	data.flags = MMC_DATA_READ;
>> +
>> +	err = mmc_send_cmd(mmc, &cmd, &data);
>> +	if (err) {
>> +		if (timeout--)
>> +			goto retry_ssr;
>> +
>> +		return err;
>> +	}
>> +
>> +	for (i = 0; i < 16; i++)
>> +		ssr[i] = be32_to_cpu(ssr[i]);
>> +
>> +	au = (ssr[2] >> 12) & 0xF;
>> +	if ((au <= 9) || (mmc->version == SD_VERSION_3)) {
>> +		mmc->ssr.au = sd_au_size[au];
>> +		es = (ssr[3] >> 24) & 0xFF;
>> +		es |= (ssr[2] & 0xFF) << 8;
>> +		et = (ssr[3] >> 18) & 0x3F;
>> +		if (es && et) {
>> +			eo = (ssr[3] >> 16) & 0x3;
>> +			mmc->ssr.erase_timeout = (et * 1000) / es;
>> +			mmc->ssr.erase_offset = eo * 1000;
>> +		}
>> +	} else {
>> +		printf("Invalid Allocation Unit Size.\n");
>> +		return -EINVAL;
>
>If AU size can't read, then your patch can't also initialize the SD-card.
>AU-size is critical things enough to go to non-initialize??

Not a must. Will use debug here and discard `return -EINVAL`.

>
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>>  /* frequency bases */
>>  /* divided by 10 to be nice to platforms without floating point */
>>  static const int fbase[] = {
>> @@ -1347,6 +1413,10 @@ static int mmc_startup(struct mmc *mmc)
>>  			mmc_set_bus_width(mmc, 4);
>>  		}
>>  
>> +		err = sd_read_ssr(mmc);
>> +		if (err)
>> +			return err;
>> +
>>  		if (mmc->card_caps & MMC_MODE_HS)
>>  			mmc->tran_speed = 50000000;
>>  		else
>> diff --git a/include/mmc.h b/include/mmc.h
>> index aa6d5d1..f09c36f 100644
>> --- a/include/mmc.h
>> +++ b/include/mmc.h
>> @@ -102,6 +102,7 @@
>>  #define SD_CMD_SWITCH_UHS18V		11
>>  
>>  #define SD_CMD_APP_SET_BUS_WIDTH	6
>> +#define SD_CMD_APP_SD_STATUS		13
>>  #define SD_CMD_ERASE_WR_BLK_START	32
>>  #define SD_CMD_ERASE_WR_BLK_END		33
>>  #define SD_CMD_APP_SEND_OP_COND		41
>> @@ -392,6 +393,12 @@ struct mmc_config {
>>  	unsigned char part_type;
>>  };
>>  
>> +struct sd_ssr {
>> +	unsigned int au;		/* In sectors */
>> +	unsigned int erase_timeout;	/* In milliseconds */
>> +	unsigned int erase_offset;	/* In milliseconds */
>> +};
>> +
>>  /*
>>   * With CONFIG_DM_MMC enabled, struct mmc can be accessed from the MMC device
>>   * with mmc_get_mmc_dev().
>> @@ -426,6 +433,7 @@ struct mmc {
>>  	uint write_bl_len;
>>  	uint erase_grp_size;	/* in 512-byte sectors */
>>  	uint hc_wp_grp_size;	/* in 512-byte sectors */
>> +	struct sd_ssr	ssr;
>
>Add the comment what is SSR.

SD Status register. Will add in V2.

Thanks,
Peng.

>
>Best Regards,
>Jaehoon Chung
>
>>  	u64 capacity;
>>  	u64 capacity_user;
>>  	u64 capacity_boot;
>> 
>