scsi: ufs: Enable WriteBooster on some pre-3.1 UFS devices

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The WriteBooster feature can be supported by some pre-3.1 UFS devices by
upgrading firmware.

To enable WriteBooster feature in such devices, introduce a device quirk to
relax the entrance condition of ufshcd_wb_probe() to allow host driver to
check those devices' WriteBooster capability.

WriteBooster feature can be available if below all conditions are
satisfied,

 1. Host enables WriteBooster capability

 2. UFS 3.1 device or UFS pre-3.1 device with quirk
    UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES enabled

 3. The device descriptor shall have DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP
    field

 4. WriteBooster support is specified in above field

Link: https://lore.kernel.org/r/20200508080115.24233-2-stanley.chu@mediatek.com
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

...

This commit is contained in:

Stanley Chu 2020-05-08 16:01:08 +08:00 • committed by Martin K. Petersen

parent 6e27a86aed

commit 817d7e1402

2 changed files with 49 additions and 25 deletions

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7

drivers/scsi/ufs/ufs_quirks.h

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67

drivers/scsi/ufs/ufshcd.c

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