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-rw-r--r--config/coreboot/dell/patches/0010-mb-dell-e6400-Use-100-MHz-reference-clock-for-displa.patch36
-rw-r--r--config/coreboot/e6400_4mb/config/libgfxinit_corebootfb1
-rw-r--r--config/coreboot/e6400_4mb/config/libgfxinit_txtmode1
-rw-r--r--config/coreboot/e6400nvidia_4mb/config/normal1
4 files changed, 39 insertions, 0 deletions
diff --git a/config/coreboot/dell/patches/0010-mb-dell-e6400-Use-100-MHz-reference-clock-for-displa.patch b/config/coreboot/dell/patches/0010-mb-dell-e6400-Use-100-MHz-reference-clock-for-displa.patch
new file mode 100644
index 00000000..7f85d0ed
--- /dev/null
+++ b/config/coreboot/dell/patches/0010-mb-dell-e6400-Use-100-MHz-reference-clock-for-displa.patch
@@ -0,0 +1,36 @@
+From c35d431a0f1b326b18cd5bbb7d1d49e67d3309bd Mon Sep 17 00:00:00 2001
+From: Nicholas Chin <nic.c3.14@gmail.com>
+Date: Mon, 20 May 2024 10:24:16 -0600
+Subject: [PATCH] mb/dell/e6400: Use 100 MHz reference clock for display
+
+The E6400 uses a 100 MHz reference clock for spread spectrum support on
+LVDS, whereas libgfxinit previously assumed a 96 MHz input clock. For
+the more common 1280 x 800 display panels, the numerical error was not
+large enough to cause noticable issues, but the actual pixel clock
+frequency derived from a 100 MHz reference using PLL configs calculated
+assuming a 96 MHz reference was not close enough for 1440 x 900 panels,
+which require a much higher pixel clock. This resulted in a garbled
+display in the pre-OS graphics environment provided by libgfxinit.
+
+Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
+---
+ src/mainboard/dell/e6400/Kconfig | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/mainboard/dell/e6400/Kconfig b/src/mainboard/dell/e6400/Kconfig
+index 034de4be2b..4cb16af697 100644
+--- a/src/mainboard/dell/e6400/Kconfig
++++ b/src/mainboard/dell/e6400/Kconfig
+@@ -17,6 +17,9 @@ config BOARD_SPECIFIC_OPTIONS
+ select INTEL_GMA_HAVE_VBT
+ select EC_DELL_MEC5035
+
++config INTEL_GMA_DPLL_REF_FREQ
++ default 100000000
++
+ config MAINBOARD_DIR
+ default "dell/e6400"
+
+--
+2.45.1
+
diff --git a/config/coreboot/e6400_4mb/config/libgfxinit_corebootfb b/config/coreboot/e6400_4mb/config/libgfxinit_corebootfb
index fcdde6b2..e61318e4 100644
--- a/config/coreboot/e6400_4mb/config/libgfxinit_corebootfb
+++ b/config/coreboot/e6400_4mb/config/libgfxinit_corebootfb
@@ -136,6 +136,7 @@ CONFIG_BOOT_DEVICE_SPI_FLASH_BUS=0
CONFIG_BOARD_DELL_E6400=y
# CONFIG_BOARD_DELL_OPTIPLEX_9010 is not set
# CONFIG_BOARD_DELL_PRECISION_T1650 is not set
+CONFIG_INTEL_GMA_DPLL_REF_FREQ=100000000
CONFIG_ECAM_MMCONF_BASE_ADDRESS=0xf0000000
CONFIG_ECAM_MMCONF_BUS_NUMBER=64
CONFIG_MEMLAYOUT_LD_FILE="src/arch/x86/memlayout.ld"
diff --git a/config/coreboot/e6400_4mb/config/libgfxinit_txtmode b/config/coreboot/e6400_4mb/config/libgfxinit_txtmode
index e253feb0..8e0b0131 100644
--- a/config/coreboot/e6400_4mb/config/libgfxinit_txtmode
+++ b/config/coreboot/e6400_4mb/config/libgfxinit_txtmode
@@ -134,6 +134,7 @@ CONFIG_BOOT_DEVICE_SPI_FLASH_BUS=0
CONFIG_BOARD_DELL_E6400=y
# CONFIG_BOARD_DELL_OPTIPLEX_9010 is not set
# CONFIG_BOARD_DELL_PRECISION_T1650 is not set
+CONFIG_INTEL_GMA_DPLL_REF_FREQ=100000000
CONFIG_ECAM_MMCONF_BASE_ADDRESS=0xf0000000
CONFIG_ECAM_MMCONF_BUS_NUMBER=64
CONFIG_MEMLAYOUT_LD_FILE="src/arch/x86/memlayout.ld"
diff --git a/config/coreboot/e6400nvidia_4mb/config/normal b/config/coreboot/e6400nvidia_4mb/config/normal
index 4593f32a..8cf79154 100644
--- a/config/coreboot/e6400nvidia_4mb/config/normal
+++ b/config/coreboot/e6400nvidia_4mb/config/normal
@@ -133,6 +133,7 @@ CONFIG_BOOT_DEVICE_SPI_FLASH_BUS=0
CONFIG_BOARD_DELL_E6400=y
# CONFIG_BOARD_DELL_OPTIPLEX_9010 is not set
# CONFIG_BOARD_DELL_PRECISION_T1650 is not set
+CONFIG_INTEL_GMA_DPLL_REF_FREQ=100000000
CONFIG_ECAM_MMCONF_BASE_ADDRESS=0xf0000000
CONFIG_ECAM_MMCONF_BUS_NUMBER=64
CONFIG_MEMLAYOUT_LD_FILE="src/arch/x86/memlayout.ld"