[PATCH v1 1/1] mmc: sd: Handle SD3.0 cards not supporting UHS-I bus speed mode

Subhash Jadavani
2011-08-10T05:46:01Z

Here is Essential conditions to indicate Version 3.00 Card
(SD_SPEC=2 and SD_SPEC3=1) :
(1) The card shall support CMD6
(2) The card shall support CMD8
(3) The card shall support CMD42
(4) User area capacity shall be up to 2GB (SDSC) or 32GB (SDHC)
User area capacity shall be more than or equal to 32GB and
up to 2TB (SDXC)
(5) Speed Class shall be supported (SDHC or SDXC)

So even if SD card doesn't support any of the newly defined
UHS-I bus speed mode, it can advertise itself as SD3.0 cards
as long as it supports all the essential conditions of
SD3.0 cards. Given this, these type of cards should atleast
run in High Speed mode @50MHZ if it supports HS.

But current initialization sequence for SD3.0 cards is
such that these non-UHS-I SD3.0 cards runs in Default
Speed mode @25MHz.

This patch makes sure that these non-UHS-I SD3.0 cards run
in High Speed Mode @50MHz.

Tested this patch with SanDisk Extreme SDHC 8GB Class 10 card.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
---
drivers/mmc/core/sd.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index ff27741..e2dcf23 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -306,6 +306,9 @@ static int mmc_read_switch(struct mmc_card *card)
goto out;
}

+ if (status[13] & 0x02)
+ card->sw_caps.hs_max_dtr = 50000000;
+
if (card->scr.sda_spec3) {
card->sw_caps.sd3_bus_mode = status[13];

@@ -348,9 +351,6 @@ static int mmc_read_switch(struct mmc_card *card)
}

card->sw_caps.sd3_curr_limit = status[7];
- } else {
- if (status[13] & 0x02)
- card->sw_caps.hs_max_dtr = 50000000;
}

out:
--
1.7.1.1

--
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.