| Message ID | 1d1b023572934d71ae75bf46c5439ed0@hyperstone.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mmc-utils: Add softreset command for issuing CMD0 | expand |
On Fri, 15 Jul 2022 at 18:55, Christian Loehle <CLoehle@hyperstone.com> wrote: > > CMD0 may be used to see if the hardware can handle a UHS card > that completed the voltage switch. If a UHS card has problems > coming back up after CMD0 your hardware may not support a hard > reset properly. > > Signed-off-by: Christian Loehle <cloehle@hyperstone.com> Please resend and add Avri Altman <avri.altman@wdc.com> on the to line. Kind regards Uffe > --- > mmc.c | 5 +++++ > mmc.h | 3 +++ > mmc_cmds.c | 30 ++++++++++++++++++++++++++++++ > mmc_cmds.h | 1 + > 4 files changed, 39 insertions(+) > > diff --git a/mmc.c b/mmc.c > index 6c56387..ba2c883 100644 > --- a/mmc.c > +++ b/mmc.c > @@ -245,6 +245,11 @@ static struct Command commands[] = { > "be 1.", > NULL > }, > + { do_soft_reset, -1, > + "softreset", "<device>\n" > + "Issues a CMD0 softreset, e.g. for testing if hardware reset for UHS works\n\n", > + NULL > + }, > { 0, 0, 0, 0 } > }; > > diff --git a/mmc.h b/mmc.h > index daff62c..9796d2e 100644 > --- a/mmc.h > +++ b/mmc.h > @@ -21,6 +21,7 @@ > #include <linux/mmc/ioctl.h> > > /* From kernel linux/mmc/mmc.h */ > +#define MMC_GO_IDLE_STATE 0 /* bc */ > #define MMC_SWITCH 6 /* ac [31:0] See below R1b */ > #define MMC_SEND_EXT_CSD 8 /* adtc R1 */ > #define MMC_SEND_STATUS 13 /* ac [31:16] RCA R1 */ > @@ -226,6 +227,7 @@ > > > /* From kernel linux/mmc/core.h */ > +#define MMC_RSP_NONE 0 /* no response */ > #define MMC_RSP_PRESENT (1 << 0) > #define MMC_RSP_136 (1 << 1) /* 136 bit response */ > #define MMC_RSP_CRC (1 << 2) /* expect valid crc */ > @@ -234,6 +236,7 @@ > > #define MMC_CMD_AC (0 << 5) > #define MMC_CMD_ADTC (1 << 5) > +#define MMC_CMD_BC (2 << 5) > > #define MMC_RSP_SPI_S1 (1 << 7) /* one status byte */ > #define MMC_RSP_SPI_BUSY (1 << 10) /* card may send busy */ > diff --git a/mmc_cmds.c b/mmc_cmds.c > index 12b7802..c027cfa 100644 > --- a/mmc_cmds.c > +++ b/mmc_cmds.c > @@ -3039,3 +3039,33 @@ out: > close(dev_fd); > return ret; > } > + > +int do_soft_reset(int nargs, char **argv) > +{ > + int fd; > + char *device; > + struct mmc_ioc_cmd idata; > + > + if (nargs != 2) { > + fprintf(stderr, "Usage: mmc status softreset </path/to/mmcblkX>\n"); > + exit(1); > + } > + > + device = argv[1]; > + > + fd = open(device, O_RDWR); > + if (fd < 0) { > + perror("open"); > + exit(1); > + } > + > + memset(&idata, 0, sizeof(idata)); > + idata.opcode = MMC_GO_IDLE_STATE; > + idata.flags = MMC_RSP_NONE | MMC_CMD_BC; > + > + /* No need to check for error, it is expected */ > + ioctl(fd, MMC_IOC_CMD, &idata); > + close(fd); > + > + return 0; > +} > diff --git a/mmc_cmds.h b/mmc_cmds.h > index 0f7c004..c112a95 100644 > --- a/mmc_cmds.h > +++ b/mmc_cmds.h > @@ -47,3 +47,4 @@ int do_read_cid(int argc, char **argv); > int do_read_csd(int argc, char **argv); > int do_erase(int nargs, char **argv); > int do_general_cmd_read(int nargs, char **argv); > +int do_soft_reset(int nargs, char **argv); > -- > 2.36.1 > > Hyperstone GmbH | Reichenaustr. 39a | 78467 Konstanz > Managing Director: Dr. Jan Peter Berns. > Commercial register of local courts: Freiburg HRB381782 >
diff --git a/mmc.c b/mmc.c index 6c56387..ba2c883 100644 --- a/mmc.c +++ b/mmc.c @@ -245,6 +245,11 @@ static struct Command commands[] = { "be 1.", NULL }, + { do_soft_reset, -1, + "softreset", "<device>\n" + "Issues a CMD0 softreset, e.g. for testing if hardware reset for UHS works\n\n", + NULL + }, { 0, 0, 0, 0 } }; diff --git a/mmc.h b/mmc.h index daff62c..9796d2e 100644 --- a/mmc.h +++ b/mmc.h @@ -21,6 +21,7 @@ #include <linux/mmc/ioctl.h> /* From kernel linux/mmc/mmc.h */ +#define MMC_GO_IDLE_STATE 0 /* bc */ #define MMC_SWITCH 6 /* ac [31:0] See below R1b */ #define MMC_SEND_EXT_CSD 8 /* adtc R1 */ #define MMC_SEND_STATUS 13 /* ac [31:16] RCA R1 */ @@ -226,6 +227,7 @@ /* From kernel linux/mmc/core.h */ +#define MMC_RSP_NONE 0 /* no response */ #define MMC_RSP_PRESENT (1 << 0) #define MMC_RSP_136 (1 << 1) /* 136 bit response */ #define MMC_RSP_CRC (1 << 2) /* expect valid crc */ @@ -234,6 +236,7 @@ #define MMC_CMD_AC (0 << 5) #define MMC_CMD_ADTC (1 << 5) +#define MMC_CMD_BC (2 << 5) #define MMC_RSP_SPI_S1 (1 << 7) /* one status byte */ #define MMC_RSP_SPI_BUSY (1 << 10) /* card may send busy */ diff --git a/mmc_cmds.c b/mmc_cmds.c index 12b7802..c027cfa 100644 --- a/mmc_cmds.c +++ b/mmc_cmds.c @@ -3039,3 +3039,33 @@ out: close(dev_fd); return ret; } + +int do_soft_reset(int nargs, char **argv) +{ + int fd; + char *device; + struct mmc_ioc_cmd idata; + + if (nargs != 2) { + fprintf(stderr, "Usage: mmc status softreset </path/to/mmcblkX>\n"); + exit(1); + } + + device = argv[1]; + + fd = open(device, O_RDWR); + if (fd < 0) { + perror("open"); + exit(1); + } + + memset(&idata, 0, sizeof(idata)); + idata.opcode = MMC_GO_IDLE_STATE; + idata.flags = MMC_RSP_NONE | MMC_CMD_BC; + + /* No need to check for error, it is expected */ + ioctl(fd, MMC_IOC_CMD, &idata); + close(fd); + + return 0; +} diff --git a/mmc_cmds.h b/mmc_cmds.h index 0f7c004..c112a95 100644 --- a/mmc_cmds.h +++ b/mmc_cmds.h @@ -47,3 +47,4 @@ int do_read_cid(int argc, char **argv); int do_read_csd(int argc, char **argv); int do_erase(int nargs, char **argv); int do_general_cmd_read(int nargs, char **argv); +int do_soft_reset(int nargs, char **argv);
CMD0 may be used to see if the hardware can handle a UHS card that completed the voltage switch. If a UHS card has problems coming back up after CMD0 your hardware may not support a hard reset properly. Signed-off-by: Christian Loehle <cloehle@hyperstone.com> --- mmc.c | 5 +++++ mmc.h | 3 +++ mmc_cmds.c | 30 ++++++++++++++++++++++++++++++ mmc_cmds.h | 1 + 4 files changed, 39 insertions(+)