linux-kernel - [PATCH] clk: tegra: Use XUSB-compatible SATA PLL sequence

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Message-ID: <1404804615-23587-1-git-send-email-mperttunen@nvidia.com>
Date:	Tue, 8 Jul 2014 10:30:15 +0300
From:	Mikko Perttunen <mperttunen@...dia.com>
To:	<abrestic@...omium.org>, <pdeschrijver@...dia.com>,
	<swarren@...dotorg.org>, <thierry.reding@...il.com>
CC:	<tj@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-ide@...r.kernel.org>,
	Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH] clk: tegra: Use XUSB-compatible SATA PLL sequence

Use a sequence for enabling hardware control of the SATA PLL
that works both when using the SATA lane with SATA and when
using it with XUSB.

Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
---
Andrew: yes, it does :)
Peter: Feel free to squash if that works for you.

 drivers/clk/tegra/clk-pll.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index f070c36..c7c6d8f 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -112,6 +112,9 @@
 
 #define SATA_PLL_CFG0		0x490
 #define SATA_PLL_CFG0_PADPLL_RESET_SWCTL	BIT(0)
+#define SATA_PLL_CFG0_PADPLL_USE_LOCKDET	BIT(2)
+#define SATA_PLL_CFG0_SEQ_ENABLE		BIT(24)
+#define SATA_PLL_CFG0_SEQ_START_STATE		BIT(25)
 
 #define PLLE_MISC_PLLE_PTS	BIT(8)
 #define PLLE_MISC_IDDQ_SW_VALUE	BIT(13)
@@ -1367,6 +1370,14 @@ static int clk_plle_tegra114_enable(struct clk_hw *hw)
 	/* Enable hw control of SATA pll */
 	val = pll_readl(SATA_PLL_CFG0, pll);
 	val &= ~SATA_PLL_CFG0_PADPLL_RESET_SWCTL;
+	val |= SATA_PLL_CFG0_PADPLL_USE_LOCKDET;
+	val |= SATA_PLL_CFG0_SEQ_START_STATE;
+	pll_writel(val, SATA_PLL_CFG0, pll);
+
+	udelay(1);
+
+	val = pll_readl(SATA_PLL_CFG0, pll);
+	val |= SATA_PLL_CFG0_SEQ_ENABLE;
 	pll_writel(val, SATA_PLL_CFG0, pll);
 
 out:
-- 
1.8.1.5

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