mmc: set a suitable max_discard_sectors value for HC
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- v3 Latest3 patches 5 repliesIn review
- v23 patches 3 repliesSuperseded
Patches in v3 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/3 | add a new quirk for SDHCI hostdrivers/ drivers/ drivers/ +3 more | +46 | 0 replies | |
| 2/3 | set timeout control reg for such SDHCI hostdrivers/ drivers/ | +10 | 4 replies | |
| 3/3 | add this quirk to MFLD SDHCI hostdrivers/ | +4 | 0 replies |
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Cover letter [PATVH v3 0/3]mmc: set a suitable max_discard_sectors value for HC
Hi,
This is the version 3 patch which set a suitable max_discard_sectors value for SDHCI host controller. In this patch, a new quirk is added for such controller.
max_discard_sectors is a parameter of MMC driver request queue. This value can limit how many sectors will be passed down to host for erasing. The original value for this parameter is UINT_MAX which means there is no limitation for the count of sectors to pass down for erasing.
But some SDHCI host controller cannot erase too many sectors at one time. It may generate a timeout interrupt since the time erasing used is longer than the timeout time host can wait.
So these patches add a new quirk for such SDHCI host controller and let it erase only signle eraseblock each time. This will be safe for such SDHCI host to use.
patch1: add a new quirk for SDHCI host controller. Also add a new routine mmc_set_discard_limit which is used to set max_discard_sectors value for such SDHCI host controller.
patch2: set timeout control register for such SDHCI host controller.
patch3: add this quirk for MFLD SDHCI host controller.
Change-log:
patch1: let mmc_set_discard_limit can return value UINT_MAX.
patch2: no change.
patch3: no change.
Thanks
Chuanxiao