From 0836cc252a5206d7308b91030f7eac186fa73c35 Mon Sep 17 00:00:00 2001 From: Peter Wang Date: Thu, 16 Jun 2022 13:37:20 +0800 Subject: scsi: ufs: ufs-mediatek: Support low-power mode for VCCQ Allow VCCQ to enter low-power mode, and also remove the restriction of VCC because VCCQ/VCCQ2 can be changed to low-power mode even if VCC stays on while the device is not in active power mode. Link: https://lore.kernel.org/r/20220616053725.5681-7-stanley.chu@mediatek.com Reviewed-by: Stanley Chu Signed-off-by: Peter Wang Signed-off-by: Stanley Chu Signed-off-by: Martin K. Petersen --- drivers/ufs/host/ufs-mediatek.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) (limited to 'drivers/ufs') diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c index 03762ecaaaf8..65a2a4185ef6 100644 --- a/drivers/ufs/host/ufs-mediatek.c +++ b/drivers/ufs/host/ufs-mediatek.c @@ -1031,7 +1031,13 @@ static int ufs_mtk_link_set_lpm(struct ufs_hba *hba) static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm) { - if (!hba->vreg_info.vccq2 || !hba->vreg_info.vcc) + struct ufs_vreg *vccqx = NULL; + + if (!hba->vreg_info.vccq && !hba->vreg_info.vccq2) + return; + + /* Skip if VCC is assumed always-on */ + if (!hba->vreg_info.vcc) return; /* Bypass LPM when device is still active */ @@ -1042,12 +1048,13 @@ static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm) if (lpm && hba->vreg_info.vcc->enabled) return; - if (lpm) - regulator_set_mode(hba->vreg_info.vccq2->reg, - REGULATOR_MODE_IDLE); + if (hba->vreg_info.vccq) + vccqx = hba->vreg_info.vccq; else - regulator_set_mode(hba->vreg_info.vccq2->reg, - REGULATOR_MODE_NORMAL); + vccqx = hba->vreg_info.vccq2; + + regulator_set_mode(vccqx->reg, + lpm ? REGULATOR_MODE_IDLE : REGULATOR_MODE_NORMAL); } static void ufs_mtk_auto_hibern8_disable(struct ufs_hba *hba) -- cgit v1.2.3