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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>
This commit is contained in:
Won Chung 2023-04-10 20:35:58 +00:00 committed by Felix Held
parent e59f18bf29
commit 467c88b3a9
2 changed files with 10 additions and 1 deletions
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7
src/drivers/gfx/generic/chip.h
View File

@ -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 @@ struct drivers_gfx_generic_device_config {
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 @@ struct drivers_gfx_generic_config {
/* 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__ */

4
src/drivers/gfx/generic/generic.c
View File

@ -128,6 +128,10 @@ static void gfx_fill_ssdt_generator(const struct device *dev)
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 */