[PATCH v3 00/15] acpi/pwm/i915: Convert pwm-crc and i915 driver's PWM code to use the atomic PWM API

[Hans de Goede]

Hi,

On 6/30/20 3:51 PM, Jani Nikula wrote:
> On Sat, 20 Jun 2020, Hans de Goede <hdegoede at redhat.com> wrote:
>> Hi All,
>>
>> Here is v3 of my patch series converting the i915 driver's code for
>> controlling the panel's backlight with an external PWM controller to
>> use the atomic PWM API. See below for the changelog.
>>
>> Initially the plan was for this series to consist of 2 parts:
>> 1. convert the pwm-crc driver to support the atomic PWM API and
>> 2. convert the i915 driver's PWM code to use the atomic PWM API.
>>
>> But during testing I've found a number of bugs in the pwm-lpss and I
>> found that the acpi_lpss code needs some special handling because of
>> some ugliness found in most Cherry Trail DSDTs.
>>
>> So now this series has grown somewhat large and consists of 4 parts:
>>
>> 1. acpi_lpss fixes workarounds for Cherry Trail DSTD nastiness
>> 2. various fixes to the pwm-lpss driver
>> 3. convert the pwm-crc driver to support the atomic PWM API and
>> 4. convert the i915 driver's PWM code to use the atomic PWM API
>>
>> So we need to discuss how to merge this (once it passes review).
>> Although the inter-dependencies are only runtime I still think we should
>> make sure that 1-3 are in the drm-intel-next-queued (dinq) tree before
>> merging the i915 changes. Both to make sure that the intel-gfx CI system
>> does not become unhappy and for bisecting reasons.
>>
>> The involved acpi_lpss and pwm drivers do not see a whole lot of churn, so
>> it likely is the easiest to just merge everything through dinq.
>>
>> Rafael and Thierry, can I get your Acked-by for directly merging this into
>> dinq?
>>
>> This series has been tested (and re-tested after adding various bug-fixes)
>> extensively. It has been tested on the following devices:
>>
>> -Asus T100TA  BYT + CRC-PMIC PWM
>> -Toshiba WT8-A  BYT + CRC-PMIC PWM
>> -Thundersoft TS178 BYT + CRC-PMIC PWM, inverse PWM
>> -Asus T100HA  CHT + CRC-PMIC PWM
>> -Terra Pad 1061  BYT + LPSS PWM
>> -Trekstor Twin 10.1 BYT + LPSS PWM
>> -Asus T101HA  CHT + CRC-PMIC PWM
>> -GPD Pocket  CHT + CRC-PMIC PWM
> 
> For the drm/i915 patches 12-15,
> 
> Acked-by: Jani Nikula <jani.nikula at intel.com>
> 
> I eyeballed through them, and didn't spot anything obviously wrong, but
> at the same time didn't have the time to do an in-depth review. That
> said, I do have a lot of trust in you testing this with all the above
> devices. I think that's enough for merging.
> 
> As for that matter, I'm fine with merging this via whichever tree you
> find best. Kind of stating the obvious, but please do ensure you have
> the proper acks in place for this.

Thank you. I plan to push the entire series to dinq once I have a
full set of acks for the PWM changes (I already have acks for the rest).

Regards,

Hans



>> Changelog:
>>
>> Changes in v2:
>> - Fix coverletter subject
>> - Drop accidentally included debugging patch
>> - "[PATCH v3 02/15] ACPI / LPSS: Save Cherry Trail PWM ctx registers only once (
>>    - Move #define LPSS_SAVE_CTX_ONCE define to group it with LPSS_SAVE_CTX
>>
>> Changes in v3:
>> - "[PATCH v3 04/15] pwm: lpss: Add range limit check for the base_unit register value"
>>    - Use base_unit_range - 1 as maximum value for the clamp()
>> - "[PATCH v3 05/15] pwm: lpss: Use pwm_lpss_apply() when restoring state on resume"
>>    - This replaces the "pwm: lpss: Set SW_UPDATE bit when enabling the PWM"
>>      patch from previous versions of this patch-set, which really was a hack
>>      working around the resume issue which this patch fixes properly.
>> - PATCH v3 6 - 11 pwm-crc changes:
>>    - Various small changes resulting from the reviews by Andy and Uwe,
>>      including some refactoring of the patches to reduce the amount of churn
>>      in the patch-set
>>
>> Regards,
>>
>> Hans
>>
>