linux-kernel - [PATCH] clk: exynos7: Mark aclk_fsys1

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Date:   Sat, 24 Oct 2020 17:43:46 +0200
From:   Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
To:     kgene@...nel.org, krzk@...nel.org, mturquette@...libre.com,
        sboyd@...nel.org
Cc:     s.nawrocki@...sung.com, tomasz.figa@...il.com,
        cw00.choi@...sung.com, linux-samsung-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
Subject: [PATCH] clk: exynos7: Mark aclk_fsys1_200 as critical

This clock must be always enabled to allow access to any registers in
fsys1 CMU. Until proper solution based on runtime PM is applied
(similar to what was done for Exynos5433), mark that clock as critical
so it won't be disabled.

It was observed on Samsung Galaxy S6 device (based on Exynos7420), where
UFS module is probed before pmic used to power that device.
In this case defer probe was happening and that clock was disabled by
UFS driver, causing whole boot to hang on next CMU access.

Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
---
 drivers/clk/samsung/clk-exynos7.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/samsung/clk-exynos7.c b/drivers/clk/samsung/clk-exynos7.c
index c1ff715e960c..1048d83f097b 100644
--- a/drivers/clk/samsung/clk-exynos7.c
+++ b/drivers/clk/samsung/clk-exynos7.c
@@ -538,7 +538,8 @@ static const struct samsung_gate_clock top1_gate_clks[] __initconst = {
 		ENABLE_ACLK_TOP13, 28, CLK_SET_RATE_PARENT |
 		CLK_IS_CRITICAL, 0),
 	GATE(CLK_ACLK_FSYS1_200, "aclk_fsys1_200", "dout_aclk_fsys1_200",
-		ENABLE_ACLK_TOP13, 24, CLK_SET_RATE_PARENT, 0),
+		ENABLE_ACLK_TOP13, 24, CLK_SET_RATE_PARENT |
+		CLK_IS_CRITICAL, 0),
 
 	GATE(CLK_SCLK_PHY_FSYS1_26M, "sclk_phy_fsys1_26m",
 		"dout_sclk_phy_fsys1_26m", ENABLE_SCLK_TOP1_FSYS11,
-- 
2.25.1