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authorMario Scheithauer <mario.scheithauer@siemens.com>2023-09-12 08:21:50 +0200
committerFelix Held <felix-coreboot@felixheld.de>2023-09-14 16:03:03 +0000
commitdb1ca86bf6bb326383f7b3688326cf6418646dd9 (patch)
tree7e783ffbd2a1cee91acc9f1d03ac4a0f0079eef8 /spd
parent038bb70b40b39db68c8f75152053216d663f1ace (diff)
mb/siemens/mc_ehl3: Enable PWM passthrough mode on PTN3460
The connected panel on this mainboard gets the PWM frequency directly from the Elkhart Lake CPU. The PWM controls the brightness of the backlight. Therefore, it is necessary to activate the PWM passthrough mode in the PTN3460 eDP-to-LVDS bridge (see PTN3460 Programming Guide - 5. Configuration Registers). Link to PTN3460 Programming Guide: https://web.archive.org/web/20230908074244/https://www.nxp.com/docs/en/application-note/AN11128.pdf BUG=none TEST=Boot into Linux and change the brightness of the screen Change-Id: Ia0a329426e585b6243c8888806befbe4f6ec2998 Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/77856 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Jan Samek <jan.samek@siemens.com>
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