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From:   Dmitry Osipenko <digetx@gmail.com>
To:     Rob Herring <robh+dt@kernel.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Joseph Lo <josephl@nvidia.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Peter De Schrijver <pdeschrijver@nvidia.com>,
        Prashant Gaikwad <pgaikwad@nvidia.com>,
        Stephen Boyd <sboyd@kernel.org>
Cc:     devicetree@vger.kernel.org, linux-clk@vger.kernel.org,
        linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v6 05/15] memory: tegra20-emc: Pre-configure debug register
Date:   Mon,  1 Jul 2019 00:00:09 +0300
Message-Id: <20190630210019.26914-6-digetx@gmail.com>
In-Reply-To: <20190630210019.26914-1-digetx@gmail.com>
References: <20190630210019.26914-1-digetx@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
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The driver expects certain debug features to be disabled in order to
work properly. Let's disable them explicitly for consistency and to not
rely on a boot state.

Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/memory/tegra/tegra20-emc.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
index 1ce351dd5461..85c24f285fd4 100644
--- a/drivers/memory/tegra/tegra20-emc.c
+++ b/drivers/memory/tegra/tegra20-emc.c
@@ -22,6 +22,7 @@
 
 #define EMC_INTSTATUS				0x000
 #define EMC_INTMASK				0x004
+#define EMC_DBG					0x008
 #define EMC_TIMING_CONTROL			0x028
 #define EMC_RC					0x02c
 #define EMC_RFC					0x030
@@ -80,6 +81,12 @@
 #define EMC_REFRESH_OVERFLOW_INT		BIT(3)
 #define EMC_CLKCHANGE_COMPLETE_INT		BIT(4)
 
+#define EMC_DBG_READ_MUX_ASSEMBLY		BIT(0)
+#define EMC_DBG_WRITE_MUX_ACTIVE		BIT(1)
+#define EMC_DBG_FORCE_UPDATE			BIT(2)
+#define EMC_DBG_READ_DQM_CTRL			BIT(9)
+#define EMC_DBG_CFG_PRIORITY			BIT(24)
+
 static const u16 emc_timing_registers[] = {
 	EMC_RC,
 	EMC_RFC,
@@ -396,7 +403,7 @@ tegra_emc_find_node_by_ram_code(struct device *dev)
 static int emc_setup_hw(struct tegra_emc *emc)
 {
 	u32 intmask = EMC_REFRESH_OVERFLOW_INT | EMC_CLKCHANGE_COMPLETE_INT;
-	u32 emc_cfg;
+	u32 emc_cfg, emc_dbg;
 
 	emc_cfg = readl_relaxed(emc->regs + EMC_CFG_2);
 
@@ -419,6 +426,14 @@ static int emc_setup_hw(struct tegra_emc *emc)
 	writel_relaxed(intmask, emc->regs + EMC_INTMASK);
 	writel_relaxed(intmask, emc->regs + EMC_INTSTATUS);
 
+	/* ensure that unwanted debug features are disabled */
+	emc_dbg = readl_relaxed(emc->regs + EMC_DBG);
+	emc_dbg |= EMC_DBG_CFG_PRIORITY;
+	emc_dbg &= ~EMC_DBG_READ_MUX_ASSEMBLY;
+	emc_dbg &= ~EMC_DBG_WRITE_MUX_ACTIVE;
+	emc_dbg &= ~EMC_DBG_FORCE_UPDATE;
+	writel_relaxed(emc_dbg, emc->regs + EMC_DBG);
+
 	return 0;
 }
 
-- 
2.22.0