From: Simon Glass <sjg@chromium.org>
Date: Sat, 15 Mar 2025 14:25:30 +0000 (+0000)
Subject: x86: Avoid clearing the VESA display
X-Git-Tag: v2025.07-rc1~119^2~9^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=899ab6cd52a4827b80dc58d25695392da40eb8ab;p=pandora-u-boot.git

x86: Avoid clearing the VESA display

U-Boot clears the display when it starts up, so there is no need to ask
the VESA driver to do this. Fix this and add a comment explaining the
flags.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

diff --git a/arch/x86/lib/bios.c b/arch/x86/lib/bios.c
index 5dfe5a647eb..de4578666fb 100644
--- a/arch/x86/lib/bios.c
+++ b/arch/x86/lib/bios.c
@@ -231,7 +231,11 @@ static void vbe_set_graphics(int vesa_mode, struct vesa_state *mode_info)
 {
 	unsigned char *framebuffer;
 
-	mode_info->video_mode = (1 << 14) | vesa_mode;
+	/*
+	 * bit 14 is linear-framebuffer mode
+	 * bit 15 means don't clear the display
+	 */
+	mode_info->video_mode = (1 << 14) | (1 << 15) | vesa_mode;
 	vbe_get_mode_info(mode_info);
 
 	framebuffer = (unsigned char *)(ulong)mode_info->vesa.phys_base_ptr;