Re: [PATCH v5 9/9] thermal: exynos: use set_trips

Lukasz Luba
2023-11-21T21:08:25Z

On 11/20/23 14:50, Mateusz Majewski wrote:
> Currently, each trip point defined in the device tree corresponds to a
> single hardware interrupt. This commit instead switches to using two
> hardware interrupts, whose values are set dynamically using the
> set_trips callback. Additionally, the critical temperature threshold is
> handled specifically.
>
> Setting interrupts in this way also fixes a long-standing lockdep
> warning, which was caused by calling thermal_zone_get_trips with our
> lock being held. Do note that this requires TMU initialization to be
> split into two parts, as done by the parent commit: parts of the
> initialization call into the thermal_zone_device structure and so must
> be done after its registration, but the initialization is also
> responsible for setting up calibration, which must be done before
> thermal_zone_device registration, which will call set_trips for the
> first time; if the calibration is not done in time, the interrupt values
> will be silently wrong!
>
> Signed-off-by: Mateusz Majewski <m.majewski2@samsung.com>
> ---
> v4 -> v5: Simplified Exynos 7 code, used the correct register offsets
> for Exynos 7 and refactored some common register-setting code.
> v2 -> v3: Fixed formatting of some comments.
> v1 -> v2: We take clocks into account; anything that sets temperature
> thresholds needs clk.
>
> drivers/thermal/samsung/exynos_tmu.c | 393 ++++++++++++++-------------
> 1 file changed, 209 insertions(+), 184 deletions(-)

The code LGTM and I like the idea of dynamically configured IRQs for
trips.

Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>

Regards,
Lukasz