kernel/linux.git/drivers/interconnect/samsung, branch v6.6.132

interconnect: exynos: drop redundant link destroy

2023-03-13T19:13:48+00:00

There is no longer any need to explicitly destroy node links as this is now done when the node is destroyed as part of icc_nodes_remove(). Reviewed-by: Krzysztof Kozlowski Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20230306075651.2449-17-johan+linaro@kernel.org Signed-off-by: Georgi Djakov

interconnect: exynos: fix registration race

2023-03-13T19:13:48+00:00

The current interconnect provider registration interface is inherently racy as nodes are not added until the after adding the provider. This can specifically cause racing DT lookups to trigger a NULL-pointer deference when either a NULL pointer or not fully initialised node is returned from exynos_generic_icc_xlate(). Switch to using the new API where the provider is not registered until after it has been fully initialised. Fixes: 2f95b9d5cf0b ("interconnect: Add generic interconnect driver for Exynos SoCs") Cc: stable@vger.kernel.org # 5.11 Cc: Sylwester Nawrocki Reviewed-by: Krzysztof Kozlowski Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20230306075651.2449-16-johan+linaro@kernel.org Signed-off-by: Georgi Djakov

interconnect: exynos: fix node leak in probe PM QoS error path

2023-03-13T19:13:48+00:00

Make sure to add the newly allocated interconnect node to the provider before adding the PM QoS request so that the node is freed on errors. Fixes: 2f95b9d5cf0b ("interconnect: Add generic interconnect driver for Exynos SoCs") Cc: stable@vger.kernel.org # 5.11 Cc: Sylwester Nawrocki Reviewed-by: Krzysztof Kozlowski Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20230306075651.2449-15-johan+linaro@kernel.org Signed-off-by: Georgi Djakov

interconnect: samsung: describe drivers in KConfig

2021-10-04T13:03:33+00:00

Describe better which driver applies to which SoC, to make configuring kernel for Samsung SoC easier. Signed-off-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20210924133441.112263-1-krzysztof.kozlowski@canonical.com Signed-off-by: Georgi Djakov

interconnect: Add generic interconnect driver for Exynos SoCs

2020-11-30T15:26:22+00:00

This patch adds a generic interconnect driver for Exynos SoCs in order to provide interconnect functionality for each "samsung,exynos-bus" compatible device. The SoC topology is a graph (or more specifically, a tree) and its edges are described by specifying in the 'interconnects' property the interconnect consumer path for each interconnect provider DT node. Each bus is now an interconnect provider and an interconnect node as well (cf. Documentation/interconnect/interconnect.rst), i.e. every bus registers itself as a node. Node IDs are not hard coded but rather assigned dynamically at runtime. This approach allows for using this driver with various Exynos SoCs. Frequencies requested via the interconnect API for a given node are propagated to devfreq using dev_pm_qos_update_request(). Please note that it is not an error when CONFIG_INTERCONNECT is 'n', in which case all interconnect API functions are no-op. The samsung,data-clk-ratio DT property is used to specify the ratio of the interconect bandwidth to the minimum data clock frequency for each bus. Due to unspecified relative probing order, -EPROBE_DEFER may be propagated to ensure that the parent is probed before its children. Reviewed-by: Chanwoo Choi Tested-by: Chanwoo Choi Acked-by: Krzysztof Kozlowski Signed-off-by: Artur Świgoń Signed-off-by: Sylwester Nawrocki Link: https://lore.kernel.org/r/20201112140931.31139-3-s.nawrocki@samsung.com Signed-off-by: Georgi Djakov