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[09/18] x86: Avoid clearing the VESA display

Message ID 20241112135911.630586-10-sjg@chromium.org
State New
Delegated to: Bin Meng
Headers show
Series x86: Improve operation under QEMU | expand

Commit Message

Simon Glass Nov. 12, 2024, 1:59 p.m. UTC 
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>
---

 arch/x86/lib/bios.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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Patch

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;