> According to UFS specification, there are two WriteBooster mode of > operations: "LU dedicated buffer" mode and "shared buffer" mode. > In the "LU dedicated buffer" mode, the WriteBooster Buffer is > dedicated to a logical unit. > > If the device supports the "LU dedicated buffer" mode, this mode is > configured by setting bWriteBoosterBufferType to 00h. The logical > unit WriteBooster Buffer size is configured by setting the > dLUNumWriteBoosterBufferAllocUnits field of the related Unit > Descriptor. Only a value greater than zero enables the WriteBooster > feature in the logical unit. > > Modify ufshcd_wb_probe() as above description to support LU Dedicated > buffer mode. > > Note that according to UFS 3.1 specification, the valid value of > bDeviceMaxWriteBoosterLUs parameter in Geometry Descriptor is 1, > which means at most one LUN can have WriteBooster buffer in "LU > dedicated buffer mode". Therefore this patch supports only one > LUN with WriteBooster enabled. All WriteBooster related sysfs nodes > are specifically mapped to the LUN with WriteBooster enabled in > LU Dedicated buffer mode. > > Signed-off-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx> Reviewed-by: Avri Altman <avri.altman@xxxxxxx>
