Chris,
Do you know what systems produce these errors? I can look and see if we
have those for testing your patch.
Cheers
Manoj
On Wed, 21 Nov 2012, Chris Ball wrote:
Hi Manoj, Matsumuro-san,
On Mon, Jul 18 2011, Manoj Iyer wrote:
Right, without the patch I get..
[ 52.526665] mmc0: new SDHC card at address e624
[ 52.571228] mmcblk0: mmc0:e624 SD16G 14.8 GiB
[ 52.591071] mmcblk0: retrying using single block read
[ 52.593105] mmcblk0: error -84 transferring data, sector 0, nr 8,
card status 0x900
[ 52.593109] end_request: I/O error, dev mmcblk0, sector 0
[ 52.594594] mmcblk0: error -84 transferring data, sector 1, nr 7,
card status 0x900
[ 52.594604] end_request: I/O error, dev mmcblk0, sector 1
[ 52.602893] quiet_error: 24 callbacks suppressed
[ 52.602902] Buffer I/O error on device mmcblk0, logical block 0
[ 52.605349] ldm_validate_partition_table(): Disk read failed.
[ 52.605384] Dev mmcblk0: unable to read RDB block 0
[ 52.607729] mmcblk0: unable to read partition table
u@u:~$
So, I cannot generate any comparison data with this SD card.
I don't know if you remember this bug, but I have reports from two users
who see "error -84"s on :e823 controllers even with this patch active on
modern ThinkPads.
Maybe 50MHz isn't low enough sometimes? Is it possible to lower the base
clock further?
I noticed that the frequency is encoded ine one of the PCI writes:
+ * 0x32 - 50Mhz new clock frequency
So if I get access to one of these systems, I might try lowering that
value (by half, say) and see what happens. But at the moment I haven't
found someone who's willing to try kernel patches yet, and I don't have
one of these systems myself.
Thanks!
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
--
====================
Manoj Iyer
Ubuntu/Canonical
Hardware Enablement
====================
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