Thanks Saugata. Looks good to me. Reviewed-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx> Regards, Subhash > -----Original Message----- > From: linux-mmc-owner@xxxxxxxxxxxxxxx [mailto:linux-mmc- > owner@xxxxxxxxxxxxxxx] On Behalf Of Saugata Das > Sent: Thursday, May 17, 2012 4:32 PM > To: linux-mmc@xxxxxxxxxxxxxxx > Cc: patches@xxxxxxxxxx; saugata.das@xxxxxxxxxx; subhashj@xxxxxxxxxxxxxx; > arnd.bergmann@xxxxxxxxxx; venkat@xxxxxxxxxx; lporzio@xxxxxxxxxx; > linkinjeon@xxxxxxxxx > Subject: [PATCH v2 2/2] [MMC-4.5] [MMC UTIL] Disable emulation > > From: Saugata Das <saugata.das@xxxxxxxxxx> > > In this patch, we add utility to disable emulation mode in the eMMC-4.5. > This is done to increase the data sector size to 4KB. > > Signed-off-by: Saugata Das <saugata.das@xxxxxxxxxx> > > changes in v2: > Removed extra blank lines around do_disable_512B_emulation > Review rework based on comments from Subhash > --- > mmc.c | 6 ++++++ > mmc.h | 10 ++++++++++ > mmc_cmds.c | 49 > +++++++++++++++++++++++++++++++++++++++++++++++++ > mmc_cmds.h | 1 + > 4 files changed, 66 insertions(+), 0 deletions(-) > > diff --git a/mmc.c b/mmc.c > index c27fc24..ebc7ab2 100644 > --- a/mmc.c > +++ b/mmc.c > @@ -65,6 +65,12 @@ static struct Command commands[] = { > "Set the eMMC writeprotect status of <device>.", > NULL > }, > + { do_disable_512B_emulation, -1, > + "disable 512B emulation", "<device>\n" > + "Set the eMMC data sector size to 4KB by disabling emulation > <device>.", > + NULL > + }, > + > { 0, 0, 0, 0 } > }; > > diff --git a/mmc.h b/mmc.h > index 3af36f1..34c31d3 100644 > --- a/mmc.h > +++ b/mmc.h > @@ -35,6 +35,16 @@ > #define EXT_CSD_PART_SWITCH_TIME 199 > #define EXT_CSD_BOOT_CFG 179 > #define EXT_CSD_BOOT_WP 173 > +#define EXT_CSD_WR_REL_PARAM 166 > +#define EXT_CSD_NATIVE_SECTOR_SIZE 63 /* R */ > +#define EXT_CSD_USE_NATIVE_SECTOR 62 /* R/W */ > +#define EXT_CSD_DATA_SECTOR_SIZE 61 /* R */ > + > +/* > + * WR_REL_PARAM field definitions > + */ > +#define HS_CTRL_REL (1<<0) > +#define EN_REL_WR (1<<2) > > /* > * EXT_CSD field definitions > diff --git a/mmc_cmds.c b/mmc_cmds.c > index 4562cef..4bc1fd6 100644 > --- a/mmc_cmds.c > +++ b/mmc_cmds.c > @@ -168,6 +168,55 @@ int do_writeprotect_set(int nargs, char **argv) > return ret; > } > > +int do_disable_512B_emulation(int nargs, char **argv) { > + __u8 ext_csd[512], native_sector_size, data_sector_size, > wr_rel_param; > + int fd, ret; > + char *device; > + > + CHECK(nargs != 2, "Usage: mmc </path/to/mmcblkX>\n", exit(1)); > + > + device = argv[1]; > + > + fd = open(device, O_RDWR); > + if (fd < 0) { > + perror("open"); > + exit(1); > + } > + > + ret = read_extcsd(fd, ext_csd); > + if (ret) { > + fprintf(stderr, "Could not read EXT_CSD from %s\n", device); > + exit(1); > + } > + > + wr_rel_param = ext_csd[EXT_CSD_WR_REL_PARAM]; > + native_sector_size = ext_csd[EXT_CSD_NATIVE_SECTOR_SIZE]; > + data_sector_size = ext_csd[EXT_CSD_DATA_SECTOR_SIZE]; > + > + if (native_sector_size && > + !data_sector_size && > + (wr_rel_param & EN_REL_WR)) { > + ret = write_extcsd_value(fd, > EXT_CSD_USE_NATIVE_SECTOR, 1); > + > + if (ret) { > + fprintf(stderr, "Could not write 0x%02x to " > + "EXT_CSD[%d] in %s\n", > + 1, EXT_CSD_BOOT_WP, device); > + exit(1); > + } > + printf("MMC disable 512B emulation successful\n" > + "Now reset the device to switch to 4KB " > + "native sector mode\n"); > + } else if (native_sector_size && data_sector_size) { > + printf("MMC already disabled 512B emulation mode\n"); > + } else { > + printf("MMC does not support disabling 512B emulation > mode\n"); > + } > + > + return ret; > +} > + > int do_read_extcsd(int nargs, char **argv) { > __u8 ext_csd[512], ext_csd_rev, reg; > diff --git a/mmc_cmds.h b/mmc_cmds.h > index 66e9acb..56f46d7 100644 > --- a/mmc_cmds.h > +++ b/mmc_cmds.h > @@ -19,3 +19,4 @@ int do_read_extcsd(int nargs, char **argv); int > do_write_extcsd(int nargs, char **argv); int do_writeprotect_get(int nargs, > char **argv); int do_writeprotect_set(int nargs, char **argv); > +int do_disable_512B_emulation(int nargs, char **argv); > -- > 1.7.4.3 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the > body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at > http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
