efifb: BGRT: Add nobgrt option
authorHans de Goede <hdegoede@redhat.com>
Wed, 26 Sep 2018 16:11:22 +0000 (18:11 +0200)
committerBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Wed, 26 Sep 2018 16:11:22 +0000 (18:11 +0200)
In some setups restoring the BGRT logo is undesirable, allow passing
video=efifb:nobgrt on the kernel commandline to disable it.

Reported-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
drivers/video/fbdev/efifb.c

index 3946649b85c8908f4e9874b837ccdad274af8499..ba906876cc454f5e67865ad7af69ee3b37f5f059 100644 (file)
@@ -42,6 +42,7 @@ struct bmp_dib_header {
        u32 colors_important;
 } __packed;
 
+static bool use_bgrt = true;
 static bool request_mem_succeeded = false;
 static u64 mem_flags = EFI_MEMORY_WC | EFI_MEMORY_UC;
 
@@ -160,6 +161,9 @@ static void efifb_show_boot_graphics(struct fb_info *info)
        void *bgrt_image = NULL;
        u8 *dst = info->screen_base;
 
+       if (!use_bgrt)
+               return;
+
        if (!bgrt_tab.image_address) {
                pr_info("efifb: No BGRT, not showing boot graphics\n");
                return;
@@ -290,6 +294,8 @@ static int efifb_setup(char *options)
                                screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
                        else if (!strcmp(this_opt, "nowc"))
                                mem_flags &= ~EFI_MEMORY_WC;
+                       else if (!strcmp(this_opt, "nobgrt"))
+                               use_bgrt = false;
                }
        }