[PATCH v2 7/9] vga16fb: drop powerpc support

Arnd Bergmann
2023-07-19T12:42:03Z

From: Arnd Bergmann <arnd@arndb.de>

I noticed that commit 0db5b61e0dc07 ("fbdev/vga16fb: Create
EGA/VGA devices in sysfb code") broke vga16fb on non-x86 platforms,
because the sysfb code never creates a vga-framebuffer device when
screen_info.orig_video_isVGA is set to '1' instead of VIDEO_TYPE_VGAC.

However, it turns out that the only architecture that has allowed
building vga16fb in the past 20 years is powerpc, and this only worked
on two 32-bit platforms and never on 64-bit powerpc. The last machine
that actually used this was removed in linux-3.10, so this is all dead
code and can be removed.

The big-endian support in vga16fb.c could also be removed, but I'd just
leave this in place.

Fixes: 933ee7119fb14 ("powerpc: remove PReP platform")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/powerpc/kernel/setup-common.c | 16 ----------------
drivers/video/fbdev/Kconfig | 2 +-
drivers/video/fbdev/vga16fb.c | 9 +--------
3 files changed, 2 insertions(+), 25 deletions(-)

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index d2a446216444f..81a6313927228 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -22,7 +22,6 @@
#include <linux/seq_file.h>
#include <linux/ioport.h>
#include <linux/console.h>
-#include <linux/screen_info.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/unistd.h>
@@ -98,21 +97,6 @@ int boot_cpu_hwid = -1;
int dcache_bsize;
int icache_bsize;

-/*
- * This still seems to be needed... -- paulus
- */
-struct screen_info screen_info = {
- .orig_x = 0,
- .orig_y = 25,
- .orig_video_cols = 80,
- .orig_video_lines = 25,
- .orig_video_isVGA = 1,
- .orig_video_points = 16
-};
-#if defined(CONFIG_FB_VGA16_MODULE)
-EXPORT_SYMBOL(screen_info);
-#endif
-
/* Variables required to store legacy IO irq routing */
int of_i8042_kbd_irq;
EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index 9169ee532baf7..ebc3cdfdfca07 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -368,7 +368,7 @@ config FB_IMSTT

config FB_VGA16
tristate "VGA 16-color graphics support"
- depends on FB && (X86 || PPC)
+ depends on FB && X86
select APERTURE_HELPERS
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
diff --git a/drivers/video/fbdev/vga16fb.c b/drivers/video/fbdev/vga16fb.c
index 34d00347ad58a..8e28f9dd19044 100644
--- a/drivers/video/fbdev/vga16fb.c
+++ b/drivers/video/fbdev/vga16fb.c
@@ -185,8 +185,6 @@ static inline void setindex(int index)
/* Check if the video mode is supported by the driver */
static inline int check_mode_supported(const struct screen_info *si)
{
- /* non-x86 architectures treat orig_video_isVGA as a boolean flag */
-#if defined(CONFIG_X86)
/* only EGA and VGA in 16 color graphic mode are supported */
if (si->orig_video_isVGA != VIDEO_TYPE_EGAC &&
si->orig_video_isVGA != VIDEO_TYPE_VGAC)
@@ -197,7 +195,7 @@ static inline int check_mode_supported(const struct screen_info *si)
si->orig_video_mode != 0x10 && /* 640x350/4 (EGA) */
si->orig_video_mode != 0x12) /* 640x480/4 (VGA) */
return -ENODEV;
-#endif
+
return 0;
}

@@ -1338,12 +1336,7 @@ static int vga16fb_probe(struct platform_device *dev)
printk(KERN_INFO "vga16fb: mapped to 0x%p\n", info->screen_base);
par = info->par;

-#if defined(CONFIG_X86)
par->isVGA = si->orig_video_isVGA == VIDEO_TYPE_VGAC;
-#else
- /* non-x86 architectures treat orig_video_isVGA as a boolean flag */
- par->isVGA = si->orig_video_isVGA;
-#endif
par->palette_blanked = 0;
par->vesa_blanked = 0;

--
2.39.2