git: d3902baca506 - stable/15 - loader.efi: only use firmware provided Blt on GOP

The branch stable/15 has been updated by vexeduxr:

URL: https://cgit.FreeBSD.org/src/commit/?id=d3902baca506ec48e2f8b1121c7744766a175516

commit d3902baca506ec48e2f8b1121c7744766a175516
Author:     Ahmad Khalifa <vexeduxr@FreeBSD.org>
AuthorDate: 2026-01-04 13:15:37 +0000
Commit:     Ahmad Khalifa <vexeduxr@FreeBSD.org>
CommitDate: 2026-01-12 17:24:55 +0000

    loader.efi: only use firmware provided Blt on GOP
    
    gfx_state.tg_private points to a EFI_GRAPHICS_OUTPUT_PROTOCOL only when
    using GOP.
    
    The firmware provided Blt functions on UGA platforms have been observed
    to not work on old MacBooks, and are likley hit or miss anyways as UGA
    has been deprecated since 2006.
    
    Reviewed by:    tsoome
    PR:             291935
    MFC after:      1 week
    Differential Revision:  https://reviews.freebsd.org/D54432
    
    (cherry picked from commit 9595055ae7494997bb07b4aaed544f88ac4c5e7f)
---
 stand/common/gfx_fb.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/stand/common/gfx_fb.c b/stand/common/gfx_fb.c
index 659bf8540422..3ac3694ce5fe 100644
--- a/stand/common/gfx_fb.c
+++ b/stand/common/gfx_fb.c
@@ -83,6 +83,7 @@
  */
 
 #include <sys/param.h>
+#include <assert.h>
 #include <stand.h>
 #include <teken.h>
 #include <gfx_fb.h>
@@ -856,7 +857,7 @@ gfxfb_blt(void *BltBuffer, GFXFB_BLT_OPERATION BltOperation,
 	int rv;
 #if defined(EFI)
 	EFI_STATUS status;
-	EFI_GRAPHICS_OUTPUT *gop = gfx_state.tg_private;
+	EFI_GRAPHICS_OUTPUT *gop;
 	EFI_TPL tpl;
 
 	/*
@@ -866,7 +867,10 @@ gfxfb_blt(void *BltBuffer, GFXFB_BLT_OPERATION BltOperation,
 	 * done as they are provided by protocols that disappear when exit
 	 * boot services.
 	 */
-	if (!ignore_gop_blt && gop != NULL && boot_services_active) {
+	if (gfx_state.tg_fb_type == FB_GOP && !ignore_gop_blt &&
+	    boot_services_active) {
+		assert(gfx_state.tg_private != NULL);
+		gop = gfx_state.tg_private;
 		tpl = BS->RaiseTPL(TPL_NOTIFY);
 		switch (BltOperation) {
 		case GfxFbBltVideoFill: