drivers/gfx/generic: Add _PLD support to GFX device
Add _PLD support to GFX device so that each display output can store
its physical location of connection point. This is to be used primarily
for describing DP on USB-C ports in the future patches.
The upstream Linux kernel now has a feature to compare _PLD of Type C
connectors and DP connectors to link them together.
https://cgit.freedesktop.org/drm/drm-misc/commit/?id=c5c51b2420625faa1f0e363f21dba1de53806ff7
This feature allows us to tell which display output is used by which
USB-C port.
So, for the future boards, we want to add _PLD for each DP connector
matching with the corresponding USB-C port.
BUG=b:277629750
TEST=emerge-${BOARD} coreboot
Signed-off-by: Won Chung <wonchung@google.com>
Change-Id: I393207746a9e82c1fd7622ab3661d7b1232cb62f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74365
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
diff --git a/src/drivers/gfx/generic/chip.h b/src/drivers/gfx/generic/chip.h
index d600823..1a666a2 100644
--- a/src/drivers/gfx/generic/chip.h
+++ b/src/drivers/gfx/generic/chip.h
@@ -4,6 +4,7 @@
#define __DRIVERS_GFX_GENERIC_CHIP_H__
#include <acpi/acpi_device.h>
+#include <acpi/acpi_pld.h>
/* Config for electronic privacy screen */
struct drivers_gfx_generic_privacy_screen_config {
@@ -35,6 +36,9 @@
unsigned int addr;
/* Electronic privacy screen specific config */
struct drivers_gfx_generic_privacy_screen_config privacy;
+ /* Physical location of connection point */
+ bool use_pld;
+ struct acpi_pld pld;
};
/* Config for an ACPI video device defined in Appendix A of the ACPI spec */
@@ -47,7 +51,8 @@
/* The number of output devices defined */
int device_count;
/* Config for output devices */
- struct drivers_gfx_generic_device_config device[5];
+ /* 1 DDIA + 1 DDIB + max 4 TCP = up to 6 GFX devices */
+ struct drivers_gfx_generic_device_config device[6];
};
#endif /* __DRIVERS_GFX_GENERIC_CHIP_H__ */
diff --git a/src/drivers/gfx/generic/generic.c b/src/drivers/gfx/generic/generic.c
index 7c6076c..0ab1676 100644
--- a/src/drivers/gfx/generic/generic.c
+++ b/src/drivers/gfx/generic/generic.c
@@ -128,6 +128,10 @@
acpigen_write_name_integer("_STA", 0xF);
gfx_fill_privacy_screen_dsm(&config->device[i].privacy);
+
+ if (config->device[i].use_pld)
+ acpigen_write_pld(&config->device[i].pld);
+
acpigen_pop_len(); /* Device */
}
acpigen_pop_len(); /* Scope */