mmc: core: Use maximum timeout values in case TACC field is zero
authorStefan Wahren <stefan.wahren@i2se.com>
Thu, 3 Apr 2014 15:32:05 +0000 (17:32 +0200)
committerChris Ball <chris@printf.net>
Tue, 22 Apr 2014 11:06:39 +0000 (07:06 -0400)
commitf7bf11a3a2e0ee829a262b4b0bb09c2bb40cf6fa
treea94b143cab2900e3b35f8750f9ac67f38dff9db6
parentd1e58212caa4fdd95dfb003ba6e90aa0c9c1ac03
mmc: core: Use maximum timeout values in case TACC field is zero

When plugging a specific micro SD card at MMC socket of a custom i.MX28 board,
we get the following kernel warning:

WARNING: CPU: 0 PID: 30 at drivers/mmc/host/mxs-mmc.c:342 mxs_mmc_start_cmd+0x34c/0x378()
Modules linked in:
CPU: 0 PID: 30 Comm: kworker/u2:1 Not tainted 3.14.0-rc5 #8
Workqueue: kmmcd mmc_rescan
[<c0015420>] (unwind_backtrace) from [<c0012cb0>] (show_stack+0x10/0x14)
[<c0012cb0>] (show_stack) from [<c001daf8>] (warn_slowpath_common+0x6c/0x8c)
[<c001daf8>] (warn_slowpath_common) from [<c001db34>] (warn_slowpath_null+0x1c/0x24)
[<c001db34>] (warn_slowpath_null) from [<c0349478>] (mxs_mmc_start_cmd+0x34c/0x378)
[<c0349478>] (mxs_mmc_start_cmd) from [<c0338fa0>] (mmc_start_request+0xc4/0xf4)
[<c0338fa0>] (mmc_start_request) from [<c03390b4>] (mmc_wait_for_req+0x50/0x164)
[<c03390b4>] (mmc_wait_for_req) from [<c03405b8>] (mmc_app_send_scr+0x158/0x1c8)
[<c03405b8>] (mmc_app_send_scr) from [<c033ee1c>] (mmc_sd_setup_card+0x80/0x3c8)
[<c033ee1c>] (mmc_sd_setup_card) from [<c033f788>] (mmc_sd_init_card+0x124/0x66c)
[<c033f788>] (mmc_sd_init_card) from [<c033fd7c>] (mmc_attach_sd+0xac/0x174)
[<c033fd7c>] (mmc_attach_sd) from [<c033a658>] (mmc_rescan+0x25c/0x2d8)
[<c033a658>] (mmc_rescan) from [<c003597c>] (process_one_work+0x1b4/0x4ec)
[<c003597c>] (process_one_work) from [<c0035de4>] (worker_thread+0x130/0x464)
[<c0035de4>] (worker_thread) from [<c003c824>] (kthread+0xb4/0xd0)
[<c003c824>] (kthread) from [<c000f420>] (ret_from_fork+0x14/0x34)

The error is due to an invalid value in CSD register of a specific 2GB
micro SD card. The CSD version of this card is 1.0 but the TACC field
has the invalid value 0.

cid:0000005553442020000000000000583f
csd:00000032535a83bfedb7ffbf1680003f
date:08/2005
erase_size:512
fwrev:0x0
hwrev:0x0
manfid:0x000000
name:USD
oemid:0x0000
preferred_erase_size:4194304
scr:0225000000000000
serial:0x00000000
type:SD

Since the kernel is making use of this TACC field to calculate the SD
card timeout, an invalid value 0 leads to a warning at
mxs_ns_to_ssp_ticks() and later the following misleading error message
appears in a loop:

mxs-mmc 80010000.ssp: card claims to support voltages below defined range
mxs-mmc 80010000.ssp: no support for card's volts
mmc0: error -22 whilst initialising MMC card

This error is only found on this 2GB SD card on mxs platform.
On x86 this card works without any problems.

The following patch based on the work of Peter Chan and Otavio Salvador.
It catches the case that the determined timeout is still 0 and sets it
to a valid value.

Successful tested on a i.MX28 board.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
drivers/mmc/core/core.c