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| author | Jinyoung Choi <j-young.choi@samsung.com> | 2022-08-04 09:53:54 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-08-23 05:15:11 +0200 |
| commit | 6c4148ce7cc1d80cef60242a97b25c83c844e68c (patch) | |
| tree | 0033df3b9f9141dc34282e957946432714f0bc14 /Documentation/ABI/testing/sysfs-driver-ufs | |
| parent | scsi: ufs: wb: Change function name and parameter names (diff) | |
| download | linux-6c4148ce7cc1d80cef60242a97b25c83c844e68c.tar.xz linux-6c4148ce7cc1d80cef60242a97b25c83c844e68c.zip | |
scsi: ufs: wb: Add explicit flush sysfs attribute
There is the following quirk to bypass "WB Flush" in Write Booster.
- UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL
If this quirk is not set, there is no knob that can control "WB Flush".
There are three flags that control Write Booster Feature:
1. WB ON/OFF
2. WB Hibern Flush ON/OFF (implicitly)
3. WB Flush ON/OFF (explicit)
The sysfs attribute that controls the WB was implemented. (1)
In the case of "Hibern Flush", it is always good to turn on. Control may
not be required. (2)
Finally, "Flush" may be necessary because the Auto-Hibern8 is not supported
in a specific environment. So the sysfs attribute that controls this is
necessary. (3)
Link: https://lore.kernel.org/r/20220804075354epcms2p8c21c894b4e28840c5fc651875b7f435f@epcms2p8
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Jinyoung Choi <j-young.choi@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-driver-ufs')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-driver-ufs | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs index 6b248abb1bd7..91de786f9a71 100644 --- a/Documentation/ABI/testing/sysfs-driver-ufs +++ b/Documentation/ABI/testing/sysfs-driver-ufs @@ -1417,6 +1417,15 @@ Description: This node is used to set or display whether UFS WriteBooster is platform that doesn't support UFSHCD_CAP_CLK_SCALING, we can disable/enable WriteBooster through this sysfs node. +What: /sys/bus/platform/drivers/ufshcd/*/enable_wb_buf_flush +What: /sys/bus/platform/devices/*.ufs/enable_wb_buf_flush +Date: July 2022 +Contact: Jinyoung Choi <j-young.choi@samsung.com> +Description: This entry shows the status of WriteBooster buffer flushing + and it can be used to enable or disable the flushing. + If flushing is enabled, the device executes the flush + operation when the command queue is empty. + What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/hpb_version What: /sys/bus/platform/devices/*.ufs/device_descriptor/hpb_version Date: June 2021 |