Patrick Georgi submitted this change.
mb/lenovo/t400: Configure panel-power sequencing
If the panel-power sequencer is not configured, libgfxinit falls back
to very conservative defaults (210ms before EDID is probed). This
results in a boot penalty of >100ms (depending on how long it takes
to probe other ports).
Values are taken from the VBTs already checked in. Untested.
Change-Id: I189776ce8684b4c3c01acd6d2fc433ca33a050d5
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38576
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
---
M src/mainboard/lenovo/t400/devicetree.cb
1 file changed, 5 insertions(+), 0 deletions(-)
diff --git a/src/mainboard/lenovo/t400/devicetree.cb b/src/mainboard/lenovo/t400/devicetree.cb
index 9561dfa..0eea193 100644
--- a/src/mainboard/lenovo/t400/devicetree.cb
+++ b/src/mainboard/lenovo/t400/devicetree.cb
@@ -3,6 +3,11 @@
register "gfx.ndid" = "3"
register "gfx.did" = "{ 0x80000100, 0x80000240, 0x80000410, 0x80000410, 0x00000005 }"
+ register "gpu_panel_power_up_delay" = "250" # T1+T2: 25ms
+ register "gpu_panel_power_down_delay" = "250" # T3: 25ms
+ register "gpu_panel_power_backlight_on_delay" = "2500" # T5: 250ms
+ register "gpu_panel_power_backlight_off_delay" = "2500" # Tx: 250ms
+ register "gpu_panel_power_cycle_delay" = "3" # T4: 200ms
register "gfx.use_spread_spectrum_clock" = "1"
device cpu_cluster 0 on
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