scsi: ufs: ufs-mediatek: support linkoff state during suspend (2a06ff20) · Commits · 戴 / test

If system suspend or runtime suspend mode is configured as linkoff state, phy can be powered off and reference clock can be gated in MediaTek Chipsets. At the same time, remove redundant reference clock control in suspend and resume callbacks because such control can be well-handled in setup_clocks callback. Link: https://lore.kernel.org/r/20200129105251.12466-3-stanley.chu@mediatek.com Reviewed-by:

Alim Akhtar <alim.akhtar@samsung.com> Reviewed-by:

Bean Huo <beanhuo@micron.com> Signed-off-by:

Stanley Chu <stanley.chu@mediatek.com> Signed-off-by:

Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ufs/ufs-mediatek.c

+7 −5

Original line number	Diff line number	Diff line
		@@ -167,7 +167,7 @@ static int ufs_mtk_setup_clocks(struct ufs_hba *hba, bool on,

		switch (status) {
		case PRE_CHANGE:
		if (!on) {
		if (!on && !ufshcd_is_link_active(hba)) {
		ufs_mtk_setup_ref_clk(hba, on);
		ret = phy_power_off(host->mphy);
		}
		@@ -437,10 +437,11 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
		err = ufs_mtk_link_set_lpm(hba);
		if (err)
		return -EAGAIN;
		phy_power_off(host->mphy);
		ufs_mtk_setup_ref_clk(hba, false);
		}

		if (!ufshcd_is_link_active(hba))
		phy_power_off(host->mphy);

		return 0;
		}

		@@ -449,9 +450,10 @@ static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
		struct ufs_mtk_host *host = ufshcd_get_variant(hba);
		int err;

		if (ufshcd_is_link_hibern8(hba)) {
		ufs_mtk_setup_ref_clk(hba, true);
		if (!ufshcd_is_link_active(hba))
		phy_power_on(host->mphy);

		if (ufshcd_is_link_hibern8(hba)) {
		err = ufs_mtk_link_set_hpm(hba);
		if (err)
		return err;

Admin message