mirror of
https://codeberg.org/libreboot/lbmk.git
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Leah Rowe
2edd583aee
Courtesy of Kat Inskip who ported this board. Headphone output doesn't work at the moment, due to incorrect verb. Intel VBT is also wrong. Both are taken from another board. This will be amended later with the correct verb and VBT. Signed-off-by: Leah Rowe <leah@libreboot.org>
52 lines
1.8 KiB
Diff
52 lines
1.8 KiB
Diff
From 130a5ca25fbedb58e49b613e4a7cece715b545ae Mon Sep 17 00:00:00 2001
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From: Nicholas Chin <nic.c3.14@gmail.com>
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Date: Mon, 20 May 2024 10:24:16 -0600
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Subject: [PATCH 18/48] mb/dell/e6400: Use 100 MHz reference clock for display
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The E6400 uses a 100 MHz reference clock for spread spectrum support on
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LVDS, whereas libgfxinit previously assumed a 96 MHz input clock. For
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the more common 1280 x 800 display panels, the numerical error was not
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large enough to cause noticable issues, but the actual pixel clock
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frequency derived from a 100 MHz reference using PLL configs calculated
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assuming a 96 MHz reference was not close enough for 1440 x 900 panels,
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which require a much higher pixel clock. This resulted in a garbled
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display in the pre-OS graphics environment provided by libgfxinit.
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Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
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---
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src/mainboard/dell/gm45_latitude/Kconfig | 2 ++
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src/northbridge/intel/gm45/Kconfig | 4 ++++
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2 files changed, 6 insertions(+)
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diff --git a/src/mainboard/dell/gm45_latitude/Kconfig b/src/mainboard/dell/gm45_latitude/Kconfig
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index edc79b0d43..5020744990 100644
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--- a/src/mainboard/dell/gm45_latitude/Kconfig
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+++ b/src/mainboard/dell/gm45_latitude/Kconfig
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@@ -22,6 +22,8 @@ config BOARD_DELL_E6400
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select BOARD_DELL_GM45_LATITUDE_COMMON
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if BOARD_DELL_GM45_LATITUDE_COMMON
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+config INTEL_GMA_DPLL_REF_FREQ
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+ default 100000000
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config MAINBOARD_DIR
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default "dell/gm45_latitude"
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diff --git a/src/northbridge/intel/gm45/Kconfig b/src/northbridge/intel/gm45/Kconfig
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index a776217475..35e89b0c88 100644
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--- a/src/northbridge/intel/gm45/Kconfig
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+++ b/src/northbridge/intel/gm45/Kconfig
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@@ -14,6 +14,10 @@ config NORTHBRIDGE_INTEL_GM45
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if NORTHBRIDGE_INTEL_GM45
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+config INTEL_GMA_DPLL_REF_FREQ
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+ int
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+ default 96000000
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+
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config VBOOT
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select VBOOT_STARTS_IN_BOOTBLOCK
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--
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2.47.3
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