Hi all,
We are porting existing OMAP HSMMC driver (omap_hsmmc.c) to an upcoming SOC.
When testing the driver with SanDisk 16GB SDHC Card (SanDisk Extreme HD Video
16GB 20Mb/s), we observed that the card doesn't switch to High Speed mode.
The card shows that it is compatible with SDA spec3.
We are testing on Linux v3.1-rc8
In mmc_sd_init_card(), rocr received from card is 0xc0ff8000, (S18A bit not
set).
During mmc_sd_setup_card() --> mmc_decode_scr(), when decoding scr, the card
specifies that it is sda spec3 compatible
if (scr->sda_vsn == SCR_SPEC_VER_2)
/* Check if Physical Layer Spec v3.0 is supported */
scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
--> true
Then during mmc_read_switch(), since it's a sda spec3 card, the code goes to
read sd3_drv_type & sd3_curr_limit and skips settings hs_max_dtr.
mmc_sd_switch_hs() returns back since hs_max_dtr == 0
if (card->sw_caps.hs_max_dtr == 0)
return 0;
Because of this Card isn't switched to High Speed mode.
Is there any solution for this? Has anyone seen this issue.
Thanks in advance.
I am also attaching the log I get from the sd dev attr
Regards
Gururaja
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat cid
0353445344313647800c03994400ac6f
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat csd
400e00325b59000076b27f800a404013
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat date
12/2010
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat erase_size
512
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat fwrev
0x0
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat hwrev
0x8
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat name
SD16G
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat manfid
0x000003
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat oemid
0x5344
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat preferred_erase_size
4194304
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat scr
0235800000000000
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat serial
0x0c039944
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat type
SD
root@arago-armv7:/sys/devices/platform/omap/omap_hsmmc.0/mmc_host/mmc0/mmc0:aaaa#
cat uevent
DRIVER=mmcblk
MMC_TYPE=SD
MMC_NAME=SD16G
MODALIAS=mmc:block
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