5 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.


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

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>
---
M src/drivers/gfx/generic/generic.c
1 file changed, 36 insertions(+), 0 deletions(-)

diff --git a/src/drivers/gfx/generic/generic.c b/src/drivers/gfx/generic/generic.c
index cd32314..0714565 100644
--- a/src/drivers/gfx/generic/generic.c
+++ b/src/drivers/gfx/generic/generic.c
@@ -140,6 +140,42 @@
 		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 */

