[SRU][Q][PATCH 1/1] memory: tegra124-emc: Fix dll_change check

[Cengiz Can]

From: Mikko Perttunen <mperttunen at nvidia.com>

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 at nvidia.com>
Link: https://patch.msgid.link/20260126-fix-emc-dllchange-v1-1-47ad3bb63262@nvidia.com
Signed-off-by: Krzysztof Kozlowski <krzk at kernel.org>
(cherry picked from commit 9597ab9a8296ab337e6820f8a717ff621078b632)
CVE-2026-53045
Assisted-by: kybele:claude-opus-4.8
Signed-off-by: Cengiz Can <cengiz.can at canonical.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 03f1daa2d132..71d20b5916d8 100644
--- a/drivers/memory/tegra/tegra124-emc.c
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -608,7 +608,7 @@ static int tegra_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;
-- 
2.43.0