Re: [PATCH v3 1/4] scsi: ufs-mediatek: ensure UniPro is not powered down before linkup

Alim Akhtar
2020-02-02T14:35:55Z

HI Stanley

On Wed, Jan 29, 2020 at 1:09 PM Stanley Chu <stanley.chu@mediatek.com> wrote:
>
> MediaTek Chipsets can enter proprietary UniPro low-power mode during
> suspend while link is in hibern8 state. Make sure leaving low-power
> mode before every link startup to prevent lockup in any possible error recovery
> path.
>
> In the same time, re-factor related funcitons to improve code readability.
>
> Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>

Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
> ---
> drivers/scsi/ufs/ufs-mediatek.c | 19 ++++++++++---------
> 1 file changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
> index 53eae5fe2ade..7ac838cc15d1 100644
> --- a/drivers/scsi/ufs/ufs-mediatek.c
> +++ b/drivers/scsi/ufs/ufs-mediatek.c
> @@ -30,6 +30,11 @@
> #define ufs_mtk_device_reset_ctrl(high, res) \
> ufs_mtk_smc(UFS_MTK_SIP_DEVICE_RESET, high, res)
>
> +#define ufs_mtk_unipro_powerdown(hba, powerdown) \
> + ufshcd_dme_set(hba, \
> + UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0), \
> + powerdown)
> +
> static void ufs_mtk_cfg_unipro_cg(struct ufs_hba *hba, bool enable)
> {
> u32 tmp;
> @@ -290,6 +295,8 @@ static int ufs_mtk_pre_link(struct ufs_hba *hba)
> int ret;
> u32 tmp;
>
> + ufs_mtk_unipro_powerdown(hba, 0);
> +
> /* disable deep stall */
> ret = ufshcd_dme_get(hba, UIC_ARG_MIB(VS_SAVEPOWERCONTROL), &tmp);
> if (ret)
> @@ -390,9 +397,7 @@ static int ufs_mtk_link_set_hpm(struct ufs_hba *hba)
> if (err)
> return err;
>
> - err = ufshcd_dme_set(hba,
> - UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
> - 0);
> + err = ufs_mtk_unipro_powerdown(hba, 0);
> if (err)
> return err;
>
> @@ -413,14 +418,10 @@ static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
> {
> int err;
>
> - err = ufshcd_dme_set(hba,
> - UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
> - 1);
> + err = ufs_mtk_unipro_powerdown(hba, 1);
> if (err) {
> /* Resume UniPro state for following error recovery */
> - ufshcd_dme_set(hba,
> - UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
> - 0);
> + ufs_mtk_unipro_powerdown(hba, 0);
> return err;
> }
>
> --
> 2.18.0

--
Regards,
Alim