Hi Hans. On Wed, Jul 08, 2020 at 11:14:16PM +0200, Hans de Goede wrote: > Hi All, > > Here is v4 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. Why is it that i915 cannot use the pwm_bl driver for backlight? I have not studied the code - just wondering. Sam > > 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 > > The involved acpi_lpss and pwm drivers do not see a whole lot of churn, > so the plan is to merge this all through drm-intel-next-queued (dinq) > once all the patches are reviewed / have acks. > > In v4 the ACPI patches have been Acked by Rafael and the i915 patches > have been acked by Jani. So that just leaves the PWM patches. > > Uwe can I get your ok / ack for merging this through the dinq branch > once you have acked al the PWM patches ? > > 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 > > 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 > > Changes in v4: > - "[PATCH v4 06/16] pwm: lpss: Correct get_state result for base_unit == 0" > - This is a new patch in v4 of this patchset > - "[PATCH v4 12/16] pwm: crc: Implement get_state() method" > - Use DIV_ROUND_UP when calculating the period and duty_cycle values > - "[PATCH v4 16/16] drm/i915: panel: Use atomic PWM API for devs with an external PWM controller" > - Add a note to the commit message about the changes in pwm_disable_backlight() > - Use the pwm_set/get_relative_duty_cycle() helpers > > Regards, > > Hans > > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/dri-devel
