efifb: BGRT: Add nobgrt option

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>

diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
index 3946649..ba90687 100644 (file)
--- a/drivers/video/fbdev/efifb.c
+++ b/drivers/video/fbdev/efifb.c
@@ -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;
                }
        }