efi/libstub: x86: Store EDID in boot_params

tdz · ardbiesheuvel · commit e41ef37ddfe7 · 2025-11-18T20:39:55.000+01:00
Retrieve the GOP device's EDID information in the kernel's boot
parameters. Makes the data avaialble to kernel graphics code and
drives, such as efidrm.

With efidrm, the EDID is now also available to user-space compositors
via standard DRM interfaces.

Signed-off-by: Thomas Zimmermann &lt;tzimmermann@suse.de&gt;
Reviewed-by: Javier Martinez Canillas &lt;javierm@redhat.com&gt;
Signed-off-by: Ard Biesheuvel &lt;ardb@kernel.org&gt;
diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
@@ -487,8 +487,9 @@ static void setup_quirks(struct boot_params *boot_params)
 static void setup_graphics(struct boot_params *boot_params)
 {
 	struct screen_info *si = memset(&boot_params->screen_info, 0, sizeof(*si));
+	struct edid_info *edid = memset(&boot_params->edid_info, 0, sizeof(*edid));
 
-	efi_setup_graphics(si, NULL);
+	efi_setup_graphics(si, edid);
 }
 
 static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status)

Original file line number	Diff line number	Diff line change
`@@ -487,8 +487,9 @@ static void setup_quirks(struct boot_params *boot_params)`
`487`	`487`	`static void setup_graphics(struct boot_params *boot_params)`
`488`	`488`	`{`
`489`	`489`	`struct screen_info si = memset(&boot_params->screen_info, 0, sizeof(si));`
	`490`	`+ struct edid_info edid = memset(&boot_params->edid_info, 0, sizeof(edid));`
`490`	`491`
`491`		`- efi_setup_graphics(si, NULL);`
	`492`	`+ efi_setup_graphics(si, edid);`
`492`	`493`	`}`
`493`	`494`
`494`	`495`	`static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status)`