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drv/gfx/generic: Add Intel ACPI Backlight funcs for LCD devices

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Normally this would be done by the Intel GMA driver, but we can't have
two copies of the _DOD method, so generate the LCD backlight controls
here to allow use of this driver instead of the default GMA panel
definition.

TEST=build/boot Win11 on google/byra (redrix), ensure ACPI brightness
controls functional.

Change-Id: Ic8fbaf7550405f8c6f36012c8efadb8c36b968c2
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80061
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Matt DeVillier 2024-01-16 18:44:27 -06:00 committed by Felix Held
parent 8f47aa8c93
commit 2981e7999e
1 changed files with 36 additions and 0 deletions
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36
src/drivers/gfx/generic/generic.c
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@ -140,6 +140,42 @@ static void gfx_fill_ssdt_generator(const struct device *dev)
if (config->device[i].use_pld)
acpigen_write_pld(&config->device[i].pld);
/* Generate ACPI brightness controls for LCD on Intel iGPU */
if (CONFIG(INTEL_GMA_ACPI) && strcmp(config->device[i].name, "LCD0") == 0) {
/*
Method (_BCL, 0, NotSerialized)
{
Return (^^XBCL())
}
*/
acpigen_write_method("_BCL", 0);
acpigen_emit_byte(RETURN_OP);
acpigen_emit_namestring("^^XBCL");
acpigen_pop_len();
/*
Method (_BCM, 1, NotSerialized)
{
^^XBCM(Arg0)
}
*/
acpigen_write_method("_BCM", 1);
acpigen_emit_namestring("^^XBCM");
acpigen_emit_byte(ARG0_OP);
acpigen_pop_len();
/*
Method (_BQC, 0, NotSerialized)
{
Return (^^XBQC())
}
*/
acpigen_write_method("_BQC", 0);
acpigen_emit_byte(RETURN_OP);
acpigen_emit_namestring("^^XBQC");
acpigen_pop_len();
}
acpigen_pop_len(); /* Device */
}
acpigen_pop_len(); /* Scope */