Linux v3.1-rc8 : SDHC card do not switch to high speed mode

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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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