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scsi: ufs-mediatek: enable low-power mode for hibern8 state
In MediaTek Chipsets, UniPro link and ufshci can enter proprietary low-power mode while link is in hibern8 state. Link: https://lore.kernel.org/r/20200117035108.19699-4-stanley.chu@mediatek.com Reviewed-by: Alim Akhtar <alim.akhtar@samsung.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>
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1 changed files with 53 additions and 0 deletions
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@ -382,11 +382,60 @@ static void ufs_mtk_device_reset(struct ufs_hba *hba)
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dev_info(hba->dev, "device reset done\n");
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}
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static int ufs_mtk_link_set_hpm(struct ufs_hba *hba)
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{
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int err;
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err = ufshcd_hba_enable(hba);
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if (err)
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return err;
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err = ufshcd_dme_set(hba,
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UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
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0);
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if (err)
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return err;
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err = ufshcd_uic_hibern8_exit(hba);
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if (!err)
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ufshcd_set_link_active(hba);
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else
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return err;
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err = ufshcd_make_hba_operational(hba);
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if (err)
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return err;
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return 0;
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}
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static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
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{
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int err;
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err = ufshcd_dme_set(hba,
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UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
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1);
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if (err) {
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/* Resume UniPro state for following error recovery */
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ufshcd_dme_set(hba,
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UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
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0);
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return err;
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}
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return 0;
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}
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static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
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{
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int err;
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struct ufs_mtk_host *host = ufshcd_get_variant(hba);
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if (ufshcd_is_link_hibern8(hba)) {
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err = ufs_mtk_link_set_lpm(hba);
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if (err)
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return -EAGAIN;
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phy_power_off(host->mphy);
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ufs_mtk_setup_ref_clk(hba, false);
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}
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@ -397,10 +446,14 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
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static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
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{
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struct ufs_mtk_host *host = ufshcd_get_variant(hba);
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int err;
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if (ufshcd_is_link_hibern8(hba)) {
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ufs_mtk_setup_ref_clk(hba, true);
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phy_power_on(host->mphy);
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err = ufs_mtk_link_set_hpm(hba);
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if (err)
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return err;
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}
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return 0;
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