linux-kernel - [PATCH v4 08/10] memory: tegra: Ensure timing control debug features are disabled

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Message-Id: <20190616233551.6838-9-digetx@gmail.com>
Date:   Mon, 17 Jun 2019 02:35:49 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Joseph Lo <josephl@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 08/10] memory: tegra: Ensure timing control debug features are disabled

Timing control debug features should be disabled at a boot time, but you
never now and hence it's better to disable them explicitly because some of
those features are crucial for the driver to do a proper thing.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/memory/tegra/mc.c | 3 +++
 drivers/memory/tegra/mc.h | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index eaebe371625c..4c1492c653e1 100644
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -660,6 +660,9 @@ static int tegra_mc_probe(struct platform_device *pdev)
 	} else
 #endif
 	{
+		/* ensure that debug features are disabled */
+		mc_writel(mc, 0x00000000, MC_TIMING_CONTROL_DBG);
+
 		err = tegra_mc_setup_latency_allowance(mc);
 		if (err < 0) {
 			dev_err(&pdev->dev,
diff --git a/drivers/memory/tegra/mc.h b/drivers/memory/tegra/mc.h
index 0720a1d2023e..abc565b42225 100644
--- a/drivers/memory/tegra/mc.h
+++ b/drivers/memory/tegra/mc.h
@@ -33,6 +33,8 @@
 #define MC_EMEM_ARB_OVERRIDE				0xe8
 #define MC_EMEM_ARB_OVERRIDE_EACK_MASK			0x3
 
+#define MC_TIMING_CONTROL_DBG				0xf8
+
 #define MC_TIMING_CONTROL				0xfc
 #define MC_TIMING_UPDATE				BIT(0)
 
-- 
2.22.0