linux-kernel - [PATCH AUTOSEL 4.4 159/174] clk: samsung: exynos5420: Preserve CPU clocks configuration during suspend/resume

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Message-Id: <20200116174251.24326-159-sashal@kernel.org>
Date:   Thu, 16 Jan 2020 12:42:36 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Marian Mihailescu <mihailescu2m@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Sasha Levin <sashal@...nel.org>,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.4 159/174] clk: samsung: exynos5420: Preserve CPU clocks configuration during suspend/resume

From: Marian Mihailescu <mihailescu2m@...il.com>

[ Upstream commit e21be0d1d7bd7f78a77613f6bcb6965e72b22fc1 ]

Save and restore top PLL related configuration registers for big (APLL)
and LITTLE (KPLL) cores during suspend/resume cycle. So far, CPU clocks
were reset to default values after suspend/resume cycle and performance
after system resume was affected when performance governor has been selected.

Fixes: 773424326b51 ("clk: samsung: exynos5420: add more registers to restore list")
Signed-off-by: Marian Mihailescu <mihailescu2m@...il.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/samsung/clk-exynos5420.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/samsung/clk-exynos5420.c b/drivers/clk/samsung/clk-exynos5420.c
index c94de13ce362..21bfedf40478 100644
--- a/drivers/clk/samsung/clk-exynos5420.c
+++ b/drivers/clk/samsung/clk-exynos5420.c
@@ -166,6 +166,8 @@ static unsigned long exynos5x_clk_regs[] __initdata = {
 	GATE_BUS_CPU,
 	GATE_SCLK_CPU,
 	CLKOUT_CMU_CPU,
+	APLL_CON0,
+	KPLL_CON0,
 	CPLL_CON0,
 	DPLL_CON0,
 	EPLL_CON0,
-- 
2.20.1