kernel/linux.git/drivers/memory, branch v5.15.209

memory: tegra30-emc: Fix dll_change check

2026-06-01T15:35:33+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

2026-06-01T15:35:33+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: mtk-smi: fix device leak on larb probe

2026-04-18T08:33:06+00:00

[ Upstream commit 9dae65913b32d05dbc8ff4b8a6bf04a0e49a8eb6 ] Make sure to drop the reference taken when looking up the SMI device during larb probe on late probe failure (e.g. probe deferral) and on driver unbind. Fixes: cc8bbe1a8312 ("memory: mediatek: Add SMI driver") Fixes: 038ae37c510f ("memory: mtk-smi: add missing put_device() call in mtk_smi_device_link_common") Cc: stable@vger.kernel.org # 4.6: 038ae37c510f Cc: stable@vger.kernel.org # 4.6 Cc: Yong Wu Cc: Miaoqian Lin Signed-off-by: Johan Hovold Link: https://patch.msgid.link/20251121164624.13685-3-johan@kernel.org Signed-off-by: Krzysztof Kozlowski Signed-off-by: Sasha Levin

memory: mtk-smi: Convert to platform remove callback returning void

2026-04-18T08:33:06+00:00

[ Upstream commit 08c1aeaa45ce0fd18912e92c6705586c8aa5240f ] The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is ignored (apart from emitting a warning) and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new(), which already returns void. Eventually after all drivers are converted, .remove_new() will be renamed to .remove(). Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/5c35a33cfdc359842e034ddd2e9358f10e91fa1f.1702822744.git.u.kleine-koenig@pengutronix.de Signed-off-by: Krzysztof Kozlowski Stable-dep-of: 9dae65913b32 ("memory: mtk-smi: fix device leak on larb probe") Signed-off-by: Sasha Levin

memory: samsung: exynos-srom: Fix of_iomap leak in exynos_srom_probe

2025-10-19T14:21:47+00:00

commit 6744085079e785dae5f7a2239456135407c58b25 upstream. The of_platform_populate() call at the end of the function has a possible failure path, causing a resource leak. Replace of_iomap() with devm_platform_ioremap_resource() to ensure automatic cleanup of srom->reg_base. This issue was detected by smatch static analysis: drivers/memory/samsung/exynos-srom.c:155 exynos_srom_probe()warn: 'srom->reg_base' from of_iomap() not released on lines: 155. Fixes: 8ac2266d8831 ("memory: samsung: exynos-srom: Add support for bank configuration") Cc: stable@vger.kernel.org Signed-off-by: Zhen Ni Link: https://lore.kernel.org/r/20250806025538.306593-1-zhen.ni@easystack.cn Signed-off-by: Krzysztof Kozlowski Signed-off-by: Greg Kroah-Hartman

memory: tegra20-emc: Correct memory device mask

2025-03-13T11:50:34+00:00

commit 9ff684342ee7d3ea2755c6e9b60bc43085baa3ad upstream. Memory chip select is swapped when we read mode register, correct it. We didn't have devices that use a single LPDDR chip and both chips are always identical, hence this change is just a minor improvement. Fixes: 131dd9a436d8 ("memory: tegra20-emc: Support matching timings by LPDDR2 configuration") Signed-off-by: Dmitry Osipenko Link: https://lore.kernel.org/r/20211222043215.28237-2-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski Signed-off-by: Greg Kroah-Hartman

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

2025-03-13T11:50:05+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: tegra20-emc: Support matching timings by LPDDR2 configuration

2025-03-13T11:50:05+00:00

[ Upstream commit 131dd9a436d8f6dbaf3d9597803765d271b2fc19 ] ASUS Transformer TF101 doesn't provide RAM code and in this case memory timings should be selected based on identity information read out from SDRAM chip. Support matching timings by LPDDR2 configuration. Signed-off-by: Dmitry Osipenko Link: https://lore.kernel.org/r/20211006224659.21434-10-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski Stable-dep-of: b9784e5cde1f ("memory: tegra20-emc: fix an OF node reference bug in tegra_emc_find_node_by_ram_code()") Signed-off-by: Sasha Levin

memory: Add LPDDR2-info helpers

2025-03-13T11:50:04+00:00

[ Upstream commit 38322cf423f69b89b6e0eaad4017ab41cfe45b45 ] Add common helpers for reading and parsing standard LPDDR2 configuration properties. Signed-off-by: Dmitry Osipenko Link: https://lore.kernel.org/r/20211006224659.21434-9-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski Stable-dep-of: b9784e5cde1f ("memory: tegra20-emc: fix an OF node reference bug in tegra_emc_find_node_by_ram_code()") Signed-off-by: Sasha Levin

memory: stm32-fmc2-ebi: check regmap_read return value

2024-09-04T11:23:25+00:00

[ Upstream commit 722463f73bcf65a8c818752a38c14ee672c77da1 ] Check regmap_read return value to avoid to use uninitialized local variables. Signed-off-by: Christophe Kerello Link: https://lore.kernel.org/r/20240226101428.37791-3-christophe.kerello@foss.st.com Signed-off-by: Krzysztof Kozlowski Signed-off-by: Sasha Levin