linux-kernel - [PATCH v1 6/6] scsi: ufs-mediatek: configure and enable clk-gating

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Date:   Fri, 20 Dec 2019 16:36:28 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     <linux-scsi@...r.kernel.org>, <martin.petersen@...cle.com>,
        <avri.altman@....com>, <alim.akhtar@...sung.com>,
        <pedrom.sousa@...opsys.com>, <jejb@...ux.ibm.com>,
        <matthias.bgg@...il.com>, <f.fainelli@...il.com>
CC:     <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <beanhuo@...ron.com>,
        <kuohong.wang@...iatek.com>, <peter.wang@...iatek.com>,
        <chun-hung.wu@...iatek.com>, <andy.teng@...iatek.com>,
        <leon.chen@...iatek.com>, Stanley Chu <stanley.chu@...iatek.com>
Subject: [PATCH v1 6/6] scsi: ufs-mediatek: configure and enable clk-gating

Enable clk-gating with customized delayed timer value in
MediaTek Chipsets.

Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>
---
 drivers/scsi/ufs/ufs-mediatek.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
index 71e2e0e4ea11..282ad06ec846 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -205,6 +205,9 @@ static int ufs_mtk_init(struct ufs_hba *hba)
 	/* Enable runtime autosuspend */
 	hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
 
+	/* Enable clock-gating */
+	hba->caps |= UFSHCD_CAP_CLK_GATING;
+
 	/*
 	 * ufshcd_vops_init() is invoked after
 	 * ufshcd_setup_clock(true) in ufshcd_hba_init() thus
@@ -293,6 +296,23 @@ static int ufs_mtk_pre_link(struct ufs_hba *hba)
 	return ret;
 }
 
+static void ufs_mtk_setup_clk_gating(struct ufs_hba *hba)
+{
+	unsigned long flags;
+	u32 ah_ms;
+
+	if (ufshcd_is_clkgating_allowed(hba)) {
+		if (ufshcd_is_auto_hibern8_supported(hba) && hba->ahit)
+			ah_ms = FIELD_GET(UFSHCI_AHIBERN8_TIMER_MASK,
+					  hba->ahit);
+		else
+			ah_ms = 10;
+		spin_lock_irqsave(hba->host->host_lock, flags);
+		hba->clk_gating.delay_ms = ah_ms + 5;
+		spin_unlock_irqrestore(hba->host->host_lock, flags);
+	}
+}
+
 static int ufs_mtk_post_link(struct ufs_hba *hba)
 {
 	/* disable device LCC */
@@ -308,6 +328,8 @@ static int ufs_mtk_post_link(struct ufs_hba *hba)
 			FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3));
 	}
 
+	ufs_mtk_setup_clk_gating(hba);
+
 	return 0;
 }
 
-- 
2.18.0