From 9397be4c801c71c84bc4ba6036efea32f5426c2e Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Fri, 29 Apr 2016 07:02:46 +0200
Subject: [PATCH 1/6] vga: Remove some "should be done in BIOS" comments

RH-Author: Gerd Hoffmann <kraxel@redhat.com>
Message-id: <1461913371-3145-2-git-send-email-kraxel@redhat.com>
Patchwork-id: 70301
O-Subject: [virt-devel] [RHEL-7.2.z qemu-kvm PATCH 1/6] vga: Remove some "should be done in BIOS" comments
Bugzilla: 1331412
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Not all platforms have a VGA BIOS, powerpc typically relies on
using the DISPI interface to initialize the card.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/display/vga.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/hw/display/vga.c b/hw/display/vga.c
index 0761b9e..48dad03 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -764,14 +764,13 @@ void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)
                 s->vbe_regs[VBE_DISPI_INDEX_ENABLE] |= VBE_DISPI_ENABLED;
                 vbe_fixup_regs(s);
 
-                /* clear the screen (should be done in BIOS) */
+                /* clear the screen */
                 if (!(val & VBE_DISPI_NOCLEARMEM)) {
                     memset(s->vram_ptr, 0,
                            s->vbe_regs[VBE_DISPI_INDEX_YRES] * s->vbe_line_offset);
                 }
 
-                /* we initialize the VGA graphic mode (should be done
-                   in BIOS) */
+                /* we initialize the VGA graphic mode */
                 /* graphic mode + memory map 1 */
                 s->gr[VGA_GFX_MISC] = (s->gr[VGA_GFX_MISC] & ~0x0c) | 0x04 |
                     VGA_GR06_GRAPHICS_MODE;
@@ -804,7 +803,6 @@ void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)
                     (shift_control << 5);
                 s->cr[VGA_CRTC_MAX_SCAN] &= ~0x9f; /* no double scan */
             } else {
-                /* XXX: the bios should do that */
                 s->bank_offset = 0;
             }
             s->dac_8bit = (val & VBE_DISPI_8BIT_DAC) > 0;
-- 
1.8.3.1