mmc: add setdsr support

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>
Acked-by: Pantelis Antoniou <panto@antoniou-consulting.com>

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 */

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

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);
 /* Function to change the size of boot partition and rpmb partitions */
 int mmc_boot_partition_size_change(struct mmc *mmc, unsigned long bootsize,
 					unsigned long rpmbsize);