linux-kernel - [PATCH V1 05/12] clk: tegra: add support for OSC clock resume

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Message-ID: <1558481483-22254-6-git-send-email-skomatineni@nvidia.com>
Date:   Tue, 21 May 2019 16:31:16 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     <thierry.reding@...il.com>, <jonathanh@...dia.com>
CC:     <jckuo@...dia.com>, <talho@...dia.com>, <josephl@...dia.com>,
        <skomatineni@...dia.com>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH V1 05/12] clk: tegra: add support for OSC clock resume

This patch adds support for restoring OSC control context on resume.

Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
---
 drivers/clk/tegra/clk-tegra-fixed.c | 15 +++++++++++++++
 drivers/clk/tegra/clk.h             |  1 +
 2 files changed, 16 insertions(+)

diff --git a/drivers/clk/tegra/clk-tegra-fixed.c b/drivers/clk/tegra/clk-tegra-fixed.c
index 91c38f1666c1..7efb35717e06 100644
--- a/drivers/clk/tegra/clk-tegra-fixed.c
+++ b/drivers/clk/tegra/clk-tegra-fixed.c
@@ -28,7 +28,10 @@
 #define OSC_CTRL			0x50
 #define OSC_CTRL_OSC_FREQ_SHIFT		28
 #define OSC_CTRL_PLL_REF_DIV_SHIFT	26
+#define OSC_CTRL_MASK			(0x3f2 |	\
+					(0xf << OSC_CTRL_OSC_FREQ_SHIFT))
 
+static u32 osc_ctrl_ctx;
 int __init tegra_osc_clk_init(void __iomem *clk_base, struct tegra_clk *clks,
 			      unsigned long *input_freqs, unsigned int num,
 			      unsigned int clk_m_div, unsigned long *osc_freq,
@@ -107,3 +110,15 @@ void __init tegra_fixed_clk_init(struct tegra_clk *tegra_clks)
 		*dt_clk = clk;
 	}
 }
+
+#ifdef CONFIG_PM_SLEEP
+void tegra_clk_osc_resume(void __iomem *clk_base)
+{
+	u32 val;
+
+	val = readl_relaxed(clk_base + OSC_CTRL) & ~OSC_CTRL_MASK;
+	val |= osc_ctrl_ctx;
+	writel_relaxed(val, clk_base + OSC_CTRL);
+	fence_udelay(2, clk_base);
+}
+#endif
diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
index ef444648fcb1..7567cf7bd29e 100644
--- a/drivers/clk/tegra/clk.h
+++ b/drivers/clk/tegra/clk.h
@@ -856,6 +856,7 @@ void tegra_clk_sync_state_pll_out(struct clk *clk);
 void tegra_clk_periph_suspend(void __iomem *clk_base);
 void tegra_clk_periph_resume(void __iomem *clk_base);
 void tegra_clk_periph_force_on(u32 *clks_on, int count, void __iomem *clk_base);
+void tegra_clk_osc_resume(void __iomem *clk_base);
 #endif
 
 
-- 
2.7.4