bios: vesa: Guard setting vesa mode with CONFIG_FRAMEBUFFER_SET_VESA_MODE

If CONFIG_FRAMEBUFFER_SET_VESA_MODE is not set, don't switch
graphics card to VESA mode. This applies to both native mode
and emulator mode of running the VGA BIOS.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/x86/lib/bios.c

@@ -185,6 +185,7 @@ static void setup_realmode_idt(void)
 	write_idt_stub((void *)0xffe6e, 0x1a);
 }
 
+#ifdef CONFIG_FRAMEBUFFER_SET_VESA_MODE
 static u8 vbe_get_mode_info(struct vbe_mode_info *mi)
 {
 	u16 buffer_seg;
@@ -241,6 +242,7 @@ static void vbe_set_graphics(int vesa_mode, struct vbe_mode_info *mode_info)
 	mode_info->video_mode &= 0x3ff;
 	vbe_set_mode(mode_info);
 }
+#endif /* CONFIG_FRAMEBUFFER_SET_VESA_MODE */
 
 void bios_run_on_x86(struct udevice *dev, unsigned long addr, int vesa_mode,
 		     struct vbe_mode_info *mode_info)
@@ -273,8 +275,10 @@ void bios_run_on_x86(struct udevice *dev, unsigned long addr, int vesa_mode,
 		      0x0);
 	debug("done\n");
 
+#ifdef CONFIG_FRAMEBUFFER_SET_VESA_MODE
 	if (vesa_mode != -1)
 		vbe_set_graphics(vesa_mode, mode_info);
+#endif
 }
 
 asmlinkage int interrupt_handler(u32 intnumber, u32 gsfs, u32 dses,

drivers/bios_emulator/atibios.c

@@ -65,6 +65,7 @@ static u32 saveBaseAddress20;
 /* Addres im memory of VBE region */
 const int vbe_offset = 0x2000;
 
+#ifdef CONFIG_FRAMEBUFFER_SET_VESA_MODE
 static const void *bios_ptr(const void *buf, BE_VGAInfo *vga_info,
 			    u32 x86_dword_ptr)
 {
@@ -215,6 +216,7 @@ static int atibios_set_vesa_mode(RMREGS *regs, int vesa_mode,
 
 	return 0;
 }
+#endif /* CONFIG_FRAMEBUFFER_SET_VESA_MODE */
 
 /****************************************************************************
 PARAMETERS:
@@ -263,11 +265,13 @@ static void PCI_doBIOSPOST(pci_dev_t pcidev, BE_VGAInfo *vga_info,
 	/*Cleanup and exit*/
 	BE_getVGA(vga_info);
 
+#ifdef CONFIG_FRAMEBUFFER_SET_VESA_MODE
 	/* Useful for debugging */
 	if (0)
 		atibios_debug_mode(vga_info, &regs, vesa_mode, mode_info);
 	if (vesa_mode != -1)
 		atibios_set_vesa_mode(&regs, vesa_mode, mode_info);
+#endif
 }
 
 /****************************************************************************