laptop-kernel/drivers/devfreq, branch master

PM / devfreq: rockchip-dfi: double count on RK3588

2025-10-15T10:03:27Z

[ Upstream commit f89c7fb83ae95578e355bed1a7aeea5f3ca5a067 ] On RK3588 with LPDDR4X memory, the cycle count as returned by perf stat -a -e rockchip_ddr/cycles/ sleep 1 consistently reads half as much as what the actual DDR frequency is at. For a LPDDR4X module running at 2112MHz, I get more like 1056059916 cycles per second, which is almost bang-on half what it should be. No, I'm not mixing up megatransfers and megahertz. Consulting the downstream driver, this appears to be because the RK3588 hardware specifically (and RK3528 as well, for future reference) needs a multiplier of 2 to get to the correct frequency with everything but LPDDR5. The RK3588's actual memory bandwidth measurements in MB/s are correct however, as confirmed with stress-ng --stream. This makes me think the access counters are not affected in the same way. This tracks with the vendor kernel not multiplying the access counts either. Solve this by adding a new member to the dfi struct, which each SoC can set to whatever they want, but defaults to 1 if left unset by the SoC init functions. The event_get_count op can then use this multiplier if the cycle count is requested. The cycle multiplier is not used in rockchip_dfi_get_event because the vendor driver doesn't use it there either, and we don't do other actual bandwidth unit conversion stuff in there anyway. Fixes: 481d97ba61e1 ("PM / devfreq: rockchip-dfi: add support for RK3588") Signed-off-by: Nicolas Frattaroli Signed-off-by: Chanwoo Choi Link: https://lore.kernel.org/lkml/20250530-rk3588-dfi-improvements-v1-1-6e077c243a95@collabora.com/ Signed-off-by: Sasha Levin

PM / devfreq: mtk-cci: Fix potential error pointer dereference in probe()

2025-10-15T10:03:25Z

[ Upstream commit fc33bf0e097c6834646b98a7b3da0ae5b617f0f9 ] The drv->sram_reg pointer could be set to ERR_PTR(-EPROBE_DEFER) which would lead to a error pointer dereference. Use IS_ERR_OR_NULL() to check that the pointer is valid. Fixes: e09bd5757b52 ("PM / devfreq: mtk-cci: Handle sram regulator probe deferral") Signed-off-by: Dan Carpenter Signed-off-by: Chanwoo Choi Link: https://patchwork.kernel.org/project/linux-pm/patch/aJTNHz8kk8s6Q2os@stanley.mountain/ Signed-off-by: Sasha Levin

PM / devfreq: Add HiSilicon uncore frequency scaling driver

2025-07-14T11:23:57Z

Add the HiSilicon uncore frequency scaling driver for Kunpeng SoCs based on the devfreq framework. The uncore domain contains shared computing resources, including system interconnects and L3 cache. The uncore frequency significantly impacts the system-wide performance as well as power consumption. This driver adds support for runtime management of uncore frequency from kernel and userspace. The main function includes setting and getting frequencies, changing frequency scaling policies, and querying the list of CPUs whose performance is significantly related to this uncore frequency domain, etc. The driver communicates with a platform controller through an ACPI PCC mailbox to take the actual actions of frequency scaling. Co-developed-by: Lifeng Zheng Signed-off-by: Lifeng Zheng Reviewed-by: Jonathan Cameron Reviewed-by: Huisong Li Signed-off-by: Jie Zhan Signed-off-by: Chanwoo Choi Link: https://patchwork.kernel.org/project/linux-pm/patch/20250623143401.4095045-3-zhanjie9@hisilicon.com/

PM / devfreq: Allow devfreq driver to add custom sysfs ABIs

2025-07-14T11:22:59Z

Extend the devfreq_dev_profile to allow drivers optionally create device-specific sysfs ABIs together with other common devfreq ABIs under the devfreq device path. Reviewed-by: Jonathan Cameron Reviewed-by: Huisong Li Signed-off-by: Jie Zhan Signed-off-by: Chanwoo Choi Link: https://patchwork.kernel.org/project/linux-pm/patch/20250623143401.4095045-2-zhanjie9@hisilicon.com/

PM / devfreq: sun8i-a33-mbus: Simplify by using more devm functions

2025-07-14T11:04:17Z

Use devm allocators for enabling the bus clock and clk_rate_exclusive_get(). This simplifies error handling and the remove callback. Reviewed-by: Chen-Yu Tsai Signed-off-by: Uwe Kleine-König Tested-by: Corentin LABBE Link: https://patchwork.kernel.org/project/linux-pm/patch/20250513203908.205060-2-u.kleine-koenig@baylibre.com/ Signed-off-by: Chanwoo Choi

PM / devfreq: Fix a index typo in trans_stat

2025-07-14T11:04:17Z

Fixes: 4920ee6dcfaf ("PM / devfreq: Convert to use sysfs_emit_at() API") Signed-off-by: pls Link: https://patchwork.kernel.org/project/linux-pm/patch/20250515143100.17849-1-chanwoo@kernel.org/ Signed-off-by: Chanwoo Choi

PM / devfreq: Check governor before using governor->name

2025-07-14T11:04:17Z

Commit 96ffcdf239de ("PM / devfreq: Remove redundant governor_name from struct devfreq") removes governor_name and uses governor->name to replace it. But devfreq->governor may be NULL and directly using devfreq->governor->name may cause null pointer exception. Move the check of governor to before using governor->name. Fixes: 96ffcdf239de ("PM / devfreq: Remove redundant governor_name from struct devfreq") Signed-off-by: Lifeng Zheng Link: https://lore.kernel.org/lkml/20250421030020.3108405-5-zhenglifeng1@huawei.com/ Signed-off-by: Chanwoo Choi

PM / devfreq: Remove redundant devfreq_get_freq_range() calling in devfreq_add_device()

2025-07-14T11:04:16Z

The calling of devfreq_get_freq_range() in devfreq_add_device() is redundant because min_freq and max_freq are never used. Remove it. Signed-off-by: Lifeng Zheng Link: https://lore.kernel.org/lkml/20250421030020.3108405-4-zhenglifeng1@huawei.com/ Signed-off-by: Chanwoo Choi

PM / devfreq: Limit max_freq with scaling_min_freq

2025-07-14T11:04:16Z

Limit max_freq in devfreq_get_freq_range() with scaling_min_freq to avoid showing an unreachable freq when reading it. Use macro clamp to simplify code. Signed-off-by: Lifeng Zheng Link: https://lore.kernel.org/lkml/20250421030020.3108405-3-zhenglifeng1@huawei.com/ Signed-off-by: Chanwoo Choi

PM / devfreq: governor: Replace sscanf() with kstrtoul() in set_freq_store()

2025-07-14T11:04:16Z

Replace sscanf() with kstrtoul() in set_freq_store() and check the result to avoid invalid input. Signed-off-by: Lifeng Zheng Link: https://lore.kernel.org/lkml/20250421030020.3108405-2-zhenglifeng1@huawei.com/ Signed-off-by: Chanwoo Choi