diff options
| author |   Avri Altman <avri.altman@wdc.com> | 2024-10-06 08:11:39 +0300 |
|---|---|---|
| committer |   Ulf Hansson <ulf.hansson@linaro.org> | 2024-10-14 12:29:01 +0200 |
| commit | fce2ce78af1e14dc1316aaddb5b3308be05cf452 (patch) | |
| tree | 50c97367bb227200734ff697acb36efc4fa84b59 /include/linux/mmc/sd.h | |
| parent | mmc: Switch back to struct platform_driver::remove() (diff) | |
| download | wireguard-linux-fce2ce78af1e14dc1316aaddb5b3308be05cf452.tar.xz wireguard-linux-fce2ce78af1e14dc1316aaddb5b3308be05cf452.zip | |
mmc: sd: SDUC Support Recognition
Ultra Capacity SD cards (SDUC) was already introduced in SD7.0. Those
cards support capacity larger than 2TB and up to including 128TB.
ACMD41 was extended to support the host-card handshake during
initialization. The card expects that the HCS & HO2T bits to be set in
the command argument, and sets the applicable bits in the R3 returned
response. On the contrary, if a SDUC card is inserted to a
non-supporting host, it will never respond to this ACMD41 until
eventually, the host will timed out and give up.
Also, add SD CSD version 3.0 - designated for SDUC, and properly parse
the csd register as the c_size field got expanded to 28 bits.
Do not enable SDUC for now - leave it to the last patch in the series.
Tested-by: Ricky WU <ricky_wu@realtek.com>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Avri Altman <avri.altman@wdc.com>
Link: https://lore.kernel.org/r/20241006051148.160278-2-avri.altman@wdc.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'include/linux/mmc/sd.h')
| -rw-r--r-- | include/linux/mmc/sd.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mmc/sd.h b/include/linux/mmc/sd.h index 6727576a8755..865cc0ca8543 100644 --- a/include/linux/mmc/sd.h +++ b/include/linux/mmc/sd.h @@ -36,6 +36,7 @@ /* OCR bit definitions */ #define SD_OCR_S18R (1 << 24) /* 1.8V switching request */ #define SD_ROCR_S18A SD_OCR_S18R /* 1.8V switching accepted by card */ +#define SD_OCR_2T (1 << 27) /* HO2T/CO2T - SDUC support */ #define SD_OCR_XPC (1 << 28) /* SDXC power control */ #define SD_OCR_CCS (1 << 30) /* Card Capacity Status */ |