linux-stable.git/drivers/memory/tegra, branch v6.12.97

memory: tegra: Wire up system sleep PM ops

2026-07-24T14:10:45+00:00

[ Upstream commit 2411c8d1e3e09910e94bab0d0a2c071fbc8a9e7b ]

The tegra-mc platform driver does not register any dev_pm_ops, so the
SoC-specific ->resume() is never invoked (e.g. tegra186_mc_resume) on
system wake. On Tegra186 and later this means MC client Stream-ID
override registers are not reprogrammed, and clients behind the ARM
SMMU fault on the first DMA after resume.

Register a dev_pm_ops on the tegra-mc driver and route the system
resume callback into mc->soc->ops->resume() so the existing SID
restore path runs again on wake.

No suspend callback is needed as the resume path reprograms all MC
state from the static SoC tables, so there is nothing to save.

Fixes: fe3b082a6eb8 ("memory: tegra: Add SID override programming for MC clients")
Signed-off-by: Ashish Mhetre 
Reviewed-by: Jon Hunter 
Link: https://patch.msgid.link/20260430095202.1167651-3-amhetre@nvidia.com
Signed-off-by: Krzysztof Kozlowski 
Signed-off-by: Sasha Levin

memory: tegra30-emc: Fix dll_change check

2026-05-23T11:04:36+00:00

[ Upstream commit 0a93f2355cf4922ad2399dbef5ea1049fef116d4 ]

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: e34212c75a68 ("memory: tegra: Introduce Tegra30 EMC driver")
Signed-off-by: Mikko Perttunen 
Link: https://patch.msgid.link/20260126-fix-emc-dllchange-v1-2-47ad3bb63262@nvidia.com
Signed-off-by: Krzysztof Kozlowski 
Signed-off-by: Sasha Levin

memory: tegra124-emc: Fix dll_change check

2026-05-23T11:04:36+00:00

[ Upstream commit 9597ab9a8296ab337e6820f8a717ff621078b632 ]

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 
Link: https://patch.msgid.link/20260126-fix-emc-dllchange-v1-1-47ad3bb63262@nvidia.com
Signed-off-by: Krzysztof Kozlowski 
Signed-off-by: Sasha Levin

memory: tegra20-emc: fix an OF node reference bug in tegra_emc_find_node_by_ram_code()

2025-02-08T08:57:41+00:00

[ Upstream commit b9784e5cde1f9fb83661a70e580e381ae1264d12 ]

As of_find_node_by_name() release the reference of the argument device
node, tegra_emc_find_node_by_ram_code() releases some device nodes while
still in use, resulting in possible UAFs. According to the bindings and
the in-tree DTS files, the "emc-tables" node is always device's child
node with the property "nvidia,use-ram-code", and the "lpddr2" node is a
child of the "emc-tables" node. Thus utilize the
for_each_child_of_node() macro and of_get_child_by_name() instead of
of_find_node_by_name() to simplify the code.

This bug was found by an experimental verification tool that I am
developing.

Fixes: 96e5da7c8424 ("memory: tegra: Introduce Tegra20 EMC driver")
Signed-off-by: Joe Hattori 
Link: https://lore.kernel.org/r/20241217091434.1993597-1-joe@pf.is.s.u-tokyo.ac.jp
Link: https://lore.kernel.org/r/20241218024415.2494267-3-joe@pf.is.s.u-tokyo.ac.jp
[krzysztof: applied v1, adjust the commit msg to incorporate v2 parts]
Signed-off-by: Krzysztof Kozlowski 
Signed-off-by: Sasha Levin

memory: tegra30-emc: simplify with scoped for each OF child loop

2024-08-21T11:23:35+00:00

Use scoped for_each_child_of_node_scoped() when iterating over device
nodes to make code a bit simpler.

Reviewed-by: Jonathan Cameron 
Link: https://lore.kernel.org/r/20240816-cleanup-h-of-node-put-memory-v2-10-9eed0ee16b78@linaro.org
Signed-off-by: Krzysztof Kozlowski

memory: tegra20-emc: simplify with scoped for each OF child loop

2024-08-21T11:23:35+00:00

Use scoped for_each_child_of_node_scoped() when iterating over device
nodes to make code a bit simpler.

Reviewed-by: Jonathan Cameron 
Link: https://lore.kernel.org/r/20240816-cleanup-h-of-node-put-memory-v2-9-9eed0ee16b78@linaro.org
Signed-off-by: Krzysztof Kozlowski

memory: tegra124-emc: simplify with scoped for each OF child loop

2024-08-21T11:23:34+00:00

Use scoped for_each_child_of_node_scoped() when iterating over device
nodes to make code a bit simpler.

Reviewed-by: Jonathan Cameron 
Link: https://lore.kernel.org/r/20240816-cleanup-h-of-node-put-memory-v2-8-9eed0ee16b78@linaro.org
Signed-off-by: Krzysztof Kozlowski

memory: tegra-mc: simplify with scoped for each OF child loop

2024-08-21T11:23:34+00:00

Use scoped for_each_child_of_node_scoped() when iterating over device
nodes to make code a bit simpler.

Reviewed-by: Jonathan Cameron 
Link: https://lore.kernel.org/r/20240816-cleanup-h-of-node-put-memory-v2-7-9eed0ee16b78@linaro.org
Signed-off-by: Krzysztof Kozlowski

memory: tegra186-emc: drop unused to_tegra186_emc()

2024-08-14T14:16:41+00:00

to_tegra186_emc() is not used, W=1 builds:

  tegra186-emc.c:38:36: error: unused function 'to_tegra186_emc' [-Werror,-Wunused-function]

Fixes: 9a38cb27668e ("memory: tegra: Add interconnect support for DRAM scaling in Tegra234")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240812123055.124123-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski

memory: tegra: Rework update_clock_tree_delay()

2024-07-29T15:35:21+00:00

Further streamline this function by moving the delay post-processing
to the callers, leaving it only with the task of returning the measured
delay values.

Signed-off-by: Diogo Ivo 
Link: https://lore.kernel.org/r/20240704-tegra210_emcfreq-v4-7-3e450503c555@tecnico.ulisboa.pt
Signed-off-by: Krzysztof Kozlowski