On 2020-12-09 15:09, Ziqi Chen wrote:
As per specs, e.g, JESD220E chapter 7.2, while powering off/on the ufs device, RST_N signal and REF_CLK signal should be between VSS(Ground) and VCCQ/VCCQ2.Power down: 1. Assert RST_N low 2. Turn-off REF_CLK 3. Turn-off VCC 4. Turn-off VCCQ/VCCQ2. power on: 1. Turn-on VCC 2. Turn-on VCCQ/VCCQ2 3. Turn-On REF_CLK 4. Deassert RST_N high. Signed-off-by: Ziqi Chen <ziqic...@codeaurora.org> --- drivers/scsi/ufs/ufs-qcom.c | 14 ++++++++++---- drivers/scsi/ufs/ufshcd.c | 19 +++++++++---------- drivers/scsi/ufs/ufshcd.h | 4 ++-- 3 files changed, 21 insertions(+), 16 deletions(-) diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 1e434cc..5ed3a63d 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -582,6 +582,9 @@ static int ufs_qcom_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) ufs_qcom_disable_lane_clks(host); phy_power_off(phy); + if (hba->vops && hba->vops->device_reset) + hba->vops->device_reset(hba, false); +
Instead of doing the pull-down in ufshcd_vops_suspend(), can we do it in ufshcd_suspend()? Since it is a common problem for all soc vendors.
} else if (!ufs_qcom_is_link_active(hba)) { ufs_qcom_disable_lane_clks(host); }@@ -1400,10 +1403,11 @@ static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba)/** * ufs_qcom_device_reset() - toggle the (optional) device reset line * @hba: per-adapter instance + * @toggle: need pulling up or not * * Toggles the (optional) reset line to reset the attached device. */ -static int ufs_qcom_device_reset(struct ufs_hba *hba) +static int ufs_qcom_device_reset(struct ufs_hba *hba, bool toggle) { struct ufs_qcom_host *host = ufshcd_get_variant(hba);@@ -1416,10 +1420,12 @@ static int ufs_qcom_device_reset(struct ufs_hba *hba)* be on the safe side. */ gpiod_set_value_cansleep(host->device_reset, 1); - usleep_range(10, 15); - gpiod_set_value_cansleep(host->device_reset, 0); - usleep_range(10, 15); + if (toggle) { + usleep_range(10, 15); + gpiod_set_value_cansleep(host->device_reset, 0); + usleep_range(10, 15); + } return 0; } diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 92d433d..5ab1c02 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -8633,8 +8633,6 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) if (ret) goto set_dev_active; - ufshcd_vreg_set_lpm(hba); - disable_clks: /** Call vendor specific suspend callback. As these callbacks may access@@ -8664,6 +8662,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) /* Put the host controller in low power mode if possible */ ufshcd_hba_vreg_set_lpm(hba); + ufshcd_vreg_set_lpm(hba);
Can you put ufshcd_vreg_set_lpm() before ufshcd_hba_vreg_set_lpm()?
goto out; set_link_active: @@ -8729,18 +8728,18 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) old_link_state = hba->uic_link_state; ufshcd_hba_vreg_set_hpm(hba); + ret = ufshcd_vreg_set_hpm(hba); + if (ret) + goto out; + /* Make sure clocks are enabled before accessing controller */ ret = ufshcd_setup_clocks(hba, true); if (ret) - goto out; + goto disable_vreg; /* enable the host irq as host controller would be active soon */ ufshcd_enable_irq(hba); - ret = ufshcd_vreg_set_hpm(hba); - if (ret) - goto disable_irq_and_vops_clks; - /** Call vendor specific resume callback. As these callbacks may access* vendor specific host controller register space call them when the @@ -8748,7 +8747,7 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) */ ret = ufshcd_vops_resume(hba, pm_op); if (ret) - goto disable_vreg; + goto disable_irq_and_vops_clks;/* For DeepSleep, the only supported option is to have the link off */ WARN_ON(ufshcd_is_ufs_dev_deepsleep(hba) && !ufshcd_is_link_off(hba));@@ -8815,8 +8814,6 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) ufshcd_link_state_transition(hba, old_link_state, 0); vendor_suspend: ufshcd_vops_suspend(hba, pm_op); -disable_vreg: - ufshcd_vreg_set_lpm(hba); disable_irq_and_vops_clks: ufshcd_disable_irq(hba); if (hba->clk_scaling.is_allowed) @@ -8827,6 +8824,8 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state); } +disable_vreg: + ufshcd_vreg_set_lpm(hba); out: hba->pm_op_in_progress = 0; if (ret) diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 61344c4..47c7dab6 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -323,7 +323,7 @@ struct ufs_hba_variant_ops { int (*resume)(struct ufs_hba *, enum ufs_pm_op); void (*dbg_register_dump)(struct ufs_hba *hba); int (*phy_initialization)(struct ufs_hba *); - int (*device_reset)(struct ufs_hba *hba); + int (*device_reset)(struct ufs_hba *hba, bool); void (*config_scaling_param)(struct ufs_hba *hba, struct devfreq_dev_profile *profile, void *data); @@ -1211,7 +1211,7 @@ static inline void ufshcd_vops_dbg_register_dump(struct ufs_hba *hba) static inline void ufshcd_vops_device_reset(struct ufs_hba *hba) { if (hba->vops && hba->vops->device_reset) { - int err = hba->vops->device_reset(hba); + int err = hba->vops->device_reset(hba, true); if (!err) ufshcd_set_ufs_dev_active(hba);
