linux-kernel - [PATCH 1/2] memory: tegra124-emc: Fix dll

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Message-Id: <20260126-fix-emc-dllchange-v1-1-47ad3bb63262@nvidia.com>
Date: Mon, 26 Jan 2026 15:50:42 +0900
From: Mikko Perttunen <mperttunen@...dia.com>
To: Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, 
 Svyatoslav Ryhel <clamor95@...il.com>, linux-tegra@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Thierry Reding <treding@...dia.com>, 
 Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH 1/2] memory: tegra124-emc: Fix dll_change check

The code checking whether the specified memory timing enables DLL
in the EMRS register was reversed. DLL is enabled if bit A0 is low.
Fix the check.

Fixes: 73a7f0a90641 ("memory: tegra: Add EMC (external memory controller) driver")
Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
---
 drivers/memory/tegra/tegra124-emc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
index 9978ff911c47..05d0d8527961 100644
--- a/drivers/memory/tegra/tegra124-emc.c
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -608,7 +608,7 @@ static int tegra124_emc_prepare_timing_change(struct tegra_emc *emc,
 
 	if ((last->emc_mode_1 & 0x1) == (timing->emc_mode_1 & 0x1))
 		dll_change = DLL_CHANGE_NONE;
-	else if (timing->emc_mode_1 & 0x1)
+	else if (!(timing->emc_mode_1 & 0x1))
 		dll_change = DLL_CHANGE_ON;
 	else
 		dll_change = DLL_CHANGE_OFF;

-- 
2.52.0