From: Stanley Chu <stanley.chu@mediatek.com>
To: <linux-scsi@vger.kernel.org>, <martin.petersen@oracle.com>,
<avri.altman@wdc.com>, <alim.akhtar@samsung.com>,
<jejb@linux.ibm.com>
Cc: <beanhuo@micron.com>, <asutoshd@codeaurora.org>,
<cang@codeaurora.org>, <matthias.bgg@gmail.com>,
<bvanassche@acm.org>, <linux-mediatek@lists.infradead.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <kuohong.wang@mediatek.com>,
<peter.wang@mediatek.com>, <chun-hung.wu@mediatek.com>,
<andy.teng@mediatek.com>, Stanley Chu <stanley.chu@mediatek.com>
Subject: [PATCH v2 5/5] scsi: ufs-mediatek: gate ref-clk during Auto-Hibern8
Date: Fri, 24 Jan 2020 23:07:43 +0800 [thread overview]
Message-ID: <20200124150743.15110-6-stanley.chu@mediatek.com> (raw)
In-Reply-To: <20200124150743.15110-1-stanley.chu@mediatek.com>
In current UFS driver design, hba->uic_link_state will not
be changed after link enters Hibern8 state by Auto-Hibern8 mechanism.
In this case, reference clock gating will be skipped unless special
handling is implemented in vendor's callbacks.
Support reference clock gating during Auto-Hibern8 period in
MediaTek Chipsets: If link state is already in Hibern8 while
Auto-Hibern8 feature is enabled, gate reference clock in
setup_clocks callback.
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
drivers/scsi/ufs/ufs-mediatek.c | 38 +++++++++++++++++++++++----------
drivers/scsi/ufs/ufs-mediatek.h | 12 +++++++++++
2 files changed, 39 insertions(+), 11 deletions(-)
diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
index d78897a14905..abf9dd75c42e 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -143,6 +143,17 @@ static int ufs_mtk_setup_ref_clk(struct ufs_hba *hba, bool on)
return 0;
}
+static u32 ufs_mtk_link_get_state(struct ufs_hba *hba)
+{
+ u32 val;
+
+ ufshcd_writel(hba, 0x20, REG_UFS_DEBUG_SEL);
+ val = ufshcd_readl(hba, REG_UFS_PROBE);
+ val = val >> 28;
+
+ return val;
+}
+
/**
* ufs_mtk_setup_clocks - enables/disable clocks
* @hba: host controller instance
@@ -155,7 +166,7 @@ static int ufs_mtk_setup_clocks(struct ufs_hba *hba, bool on,
enum ufs_notify_change_status status)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
- int ret = -EINVAL;
+ int ret = 0;
/*
* In case ufs_mtk_init() is not yet done, simply ignore.
@@ -165,19 +176,24 @@ static int ufs_mtk_setup_clocks(struct ufs_hba *hba, bool on,
if (!host)
return 0;
- switch (status) {
- case PRE_CHANGE:
- if (!on && !ufshcd_is_link_active(hba)) {
+ if (!on && status == PRE_CHANGE) {
+ if (!ufshcd_is_link_active(hba)) {
ufs_mtk_setup_ref_clk(hba, on);
ret = phy_power_off(host->mphy);
+ } else {
+ /*
+ * Gate ref-clk if link state is in Hibern8
+ * triggered by Auto-Hibern8.
+ */
+ if (!ufshcd_can_hibern8_during_gating(hba) &&
+ ufshcd_is_auto_hibern8_enabled(hba) &&
+ ufs_mtk_link_get_state(hba) ==
+ VS_LINK_HIBER8)
+ ufs_mtk_setup_ref_clk(hba, on);
}
- break;
- case POST_CHANGE:
- if (on) {
- ret = phy_power_on(host->mphy);
- ufs_mtk_setup_ref_clk(hba, on);
- }
- break;
+ } else if (on && status == POST_CHANGE) {
+ ret = phy_power_on(host->mphy);
+ ufs_mtk_setup_ref_clk(hba, on);
}
return ret;
diff --git a/drivers/scsi/ufs/ufs-mediatek.h b/drivers/scsi/ufs/ufs-mediatek.h
index fccdd979d6fb..c32cb42c8942 100644
--- a/drivers/scsi/ufs/ufs-mediatek.h
+++ b/drivers/scsi/ufs/ufs-mediatek.h
@@ -53,6 +53,18 @@
#define VS_SAVEPOWERCONTROL 0xD0A6
#define VS_UNIPROPOWERDOWNCONTROL 0xD0A8
+/*
+ * Vendor specific link state
+ */
+enum {
+ VS_LINK_DISABLED = 0,
+ VS_LINK_DOWN = 1,
+ VS_LINK_UP = 2,
+ VS_LINK_HIBER8 = 3,
+ VS_LINK_LOST = 4,
+ VS_LINK_CFG = 5,
+};
+
/*
* SiP commands
*/
--
2.18.0
prev parent reply other threads:[~2020-01-24 15:08 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-24 15:07 [PATCH v2 0/5] MediaTek UFS vendor implemenation part III and Auto-Hibern8 fix Stanley Chu
2020-01-24 15:07 ` [PATCH v2 1/5] scsi: ufs-mediatek: ensure UniPro is not powered down before linkup Stanley Chu
2020-01-24 15:07 ` [PATCH v2 2/5] scsi: ufs-mediatek: support linkoff state during suspend Stanley Chu
2020-01-24 15:07 ` [PATCH v2 3/5] scsi: ufs: add ufshcd_is_auto_hibern8_enabled facility Stanley Chu
2020-01-28 15:38 ` [EXT] " Bean Huo (beanhuo)
2020-01-24 15:07 ` [PATCH v2 4/5] scsi: ufs: fix auto-hibern8 error detection Stanley Chu
2020-01-28 15:52 ` [EXT] " Bean Huo (beanhuo)
2020-01-29 6:33 ` Stanley Chu
2020-01-24 15:07 ` Stanley Chu [this message]
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