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| author | Hans de Goede <hdegoede@redhat.com> | 2023-02-22 22:42:26 +0100 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2023-03-07 12:08:31 +0100 |
| commit | 607fbac0fccba506b4f9e47994504121db776956 (patch) | |
| tree | a1117086f32ec9d6d82633db417a13ed9e2824e2 /lib/mpi/mpiutil.c | |
| parent | 9b1d2662b8c586eb10cb939c7ae2c25bb36d2b61 (diff) | |
platform/x86: x86-android-tablets: Add backlight ctrl for Lenovo Yoga Tab 3 Pro YT3-X90F
The YT3 uses an TI LP8557 LED backlight controller, the LP8557's PWM input
is connected to a PWM output coming from the LCD panel's controller.
The Android kernel has a hack in the i915 driver to write the non-standard
DSI reg 0x51 with the desired level to set the duty-cycle of the LCD's PWM.
To avoid having to have a similar hack in the mainline kernel program
instantiate an i2c-client for the LP8557 with platform-data to have
the LP8557 to directly set the level (ignoring its PWM input), this allows
backlight brightness control through a backlight device registered by
the lp855x_bl driver.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20230301092331.7038-13-hdegoede@redhat.com
Diffstat (limited to 'lib/mpi/mpiutil.c')
0 files changed, 0 insertions, 0 deletions