Re: [U-Boot] [PATCH V2] mmc: add setdsr support

16 Dec 2013

Hi Markus,
You missed the code comment about the format of the if statement.
Regards
-- Pantelis
On Dec 16, 2013, at 2:40 PM, Markus Niebel wrote:
...
From: Markus Niebel Markus.Niebel@tqs.de
The eMMC and the SD-Card specifications describe the optional SET_DSR command.
During measurements at our lab we found that some cards implementing this feature
having really strong driver strengts per default. This can lead to voltage peaks
above the specification of the host on signal edges for data sent from a card to
the host.
Since availability of a given card type may be shorter than the time a certain
hardware will be produced it is useful to have support for this command (Alternative
would be changing termination resistors and adapting the driver strength of the
host to the used card.)
Following proposal for an implementation:

new field that reflects CSD field DSR_IMP in struct mmc
new field for design specific DSR value in struct mmc
board code can set DSR value in mmc struct just after registering an controller
mmc_startup sends the the stored DSR value before selecting a card, if DSR_IMP is set

Additionally the mmc command is extended to make is possible to play around with different
DSR values.
The concept was tested on a i.MX53 based platform using a Micron eMMC card where the default
DSR is 0x0400 (12mA) but in our design 0x0100 (0x0100) were enough. To use this feature for
instance on a mx53loco one have to add a call to mmc_set_dsr() in board_mmc_init() after
calling fsl_esdhc_initialize() for the eMMC.
Signed-off-by: Markus Niebel Markus.Niebel@tqs.de
changes for V2:

extend documentation according to the comments from Pantelis Antoniou

common/cmd_mmc.c  |   23 +++++++++++++++++++++++
drivers/mmc/mmc.c |   18 ++++++++++++++++++
include/mmc.h     |    3 +++
3 files changed, 44 insertions(+)

diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c
index 67a94a7..da5fef9 100644
--- a/common/cmd_mmc.c
+++ b/common/cmd_mmc.c
@@ -340,6 +340,28 @@ static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
   	}
#endif /* CONFIG_SUPPORT_EMMC_BOOT */
   }


else if (argc == 3 && strcmp(argv[1], "setdsr") == 0) {
struct mmc *mmc = find_mmc_device(curr_device);


u32 val = simple_strtoul(argv[2], NULL, 16);


int ret;



if (!mmc) {


	printf("no mmc device at slot %x\n", curr_device);


	return 1;


}


ret = mmc_set_dsr(mmc, val);


printf("set dsr %s\n", (!ret) ? "OK, force rescan" : "ERROR");


if (!ret) {


	mmc->has_init = 0;


	if (mmc_init(mmc))


		return 1;


	else


		return 0;


}


return ret;


}
state = MMC_INVALID;
 if (argc == 5 && strcmp(argv[1], "read") == 0)
  state = MMC_READ;

@@ -423,5 +445,6 @@ U_BOOT_CMD(
   "mmc bootpart <device num> <boot part size MB> <RPMB part size MB>\n"
   " - change sizes of boot and RPMB partitions of specified device\n"
#endif

"mmc setdsr - set DSR register value\n"
);

#endif /* !CONFIG_GENERIC_MMC */
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index e1461a9..c6a1c23 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -877,6 +877,7 @@ static int mmc_startup(struct mmc *mmc)
mmc->tran_speed = freq * mult;

mmc->dsr_imp = ((cmd.response[1] >> 12) & 0x1);
mmc->read_bl_len = 1 << ((cmd.response[1] >> 16) & 0xf);
if (IS_SD(mmc))


@@ -907,6 +908,14 @@ static int mmc_startup(struct mmc *mmc)
   if (mmc->write_bl_len > MMC_MAX_BLOCK_LEN)
   	mmc->write_bl_len = MMC_MAX_BLOCK_LEN;

if ((mmc->dsr_imp) && (0xffffffff != mmc->dsr)) {
cmd.cmdidx = MMC_CMD_SET_DSR;


cmd.cmdarg = (mmc->dsr & 0xffff) << 16;


cmd.resp_type = MMC_RSP_NONE;


if (mmc_send_cmd(mmc, &cmd, NULL))


	printf("MMC: SET_DSR failed\n");


}
/* Select the card, and put it into Transfer Mode */
 if (!mmc_host_is_spi(mmc)) { /* cmd not supported in spi */
  cmd.cmdidx = MMC_CMD_SELECT_CARD;

@@ -1163,6 +1172,9 @@ static int mmc_send_if_cond(struct mmc *mmc)
int mmc_register(struct mmc *mmc)
{

/* Setup dsr related values */
mmc->dsr_imp = 0;
mmc->dsr = 0xffffffff;
/* Setup the universal parts of the block interface just once */
mmc->block_dev.if_type = IF_TYPE_MMC;
mmc->block_dev.dev = cur_dev_num++;

@@ -1280,6 +1292,12 @@ int mmc_init(struct mmc *mmc)
   return err;
}
+int mmc_set_dsr(struct mmc *mmc, u16 val)
+{

mmc->dsr = val;
return 0;

+}



/*

CPU and board-specific MMC initializations.  Aliased function
signals caller to move on

diff --git a/include/mmc.h b/include/mmc.h
index cb558da..facb819 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -262,6 +262,8 @@ struct mmc {
   uint card_caps;
   uint host_caps;
   uint ocr;

uint dsr;
uint dsr_imp;
uint scr[2];
uint csd[4];
uint cid[4];

@@ -304,6 +306,7 @@ int board_mmc_getcd(struct mmc *mmc);
int mmc_switch_part(int dev_num, unsigned int part_num);
int mmc_getcd(struct mmc *mmc);
int mmc_getwp(struct mmc *mmc);
+int mmc_set_dsr(struct mmc *mmc, u16 val);
void spl_mmc_load(void) __noreturn;
/* Function to change the size of boot partition and rpmb partitions */
int mmc_boot_partition_size_change(struct mmc *mmc, unsigned long bootsize,
-- 
1.7.9.5

    