On 11/14/2010 11:47 AM, Chuanxiao.Dong wrote:
Hi Arjan,
These 4 patches set a suitable max_discard_sectors value for mmc queue
which will be used for ERASE/TRIM. Right now the max_discard_sectors value
is UINT_MAX which allows kernel block layer pass down unlimited number of
ERASE/TRIM sectors one time. For MFLD sdhci host controller, erasing so
much sectors one time need much long time. So, set a suitable
max_discard_sectors value for mmc queue which can let host controller erase
many sectors during a proper timeout time.
patch1: removed unused code in block.c and queue.c
patch2: calculated a suitable timeout time for SDHCI host controller. Each
erase cmd should be finished within the timeout time.
patch3: calculated a suitable max_discard_sectors value for mmc queue.
Since some SDHCI host controller cannot process the whole sectors at one
time. In this patch, a new callback get_tmclk in mmc_host_ops was added to
help core layer to calculate the max value. If this callback was
implemented, core layer will calculted a suitable value. If not, the
max_discard_sectors value will be the same as before.
patch4: implemented get_tmclk callback for SDHCI host controller.
Regards
Chuanxiao
what is the upstream status of these core changes?
this is not code that only impacts medfield....... really needs to get
upstream review first!
_______________________________________________
MeeGo-kernel mailing list
[email protected]
http://lists.meego.com/listinfo/meego-kernel
