RE: [PATCH v2 1/5] scsi: ufs: allow legacy UFS devices to enable WriteBooster

Stanley Chu
2020-04-30T08:34:48Z

Hi Avri,

On Thu, 2020-04-30 at 07:44 +0000, Avri Altman wrote:
> Hi Stanley,
>
> >
> > WriteBooster feature may be supported by some legacy UFS devices
> > (i.e., < 3.1) by upgrading firmware.
> >
> > To enable WriteBooster feature in such devices, 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 both conditions are
> > satisfied,
> >
> > 1. Device descriptor has dExtendedUFSFeaturesSupport field.
> > 2. WriteBooster support is specified in above field.
> >
> > Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
> > Reviewed-by: Bean Huo <beanhuo@micron.com>
> WB was first introduced as part of UFS3.1, and lately as part of UFS2.2.
> Any non-standard behavior should be classified as a quirk.

OK! I will try to revise this patch to allow only standard devices
handled by normal path and non-standard devices handled by device
quirks.

Thanks,
Stanley Chu