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fbdev: atafb: Fix broken frame buffer after kexec

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On Falcon, Atari frame buffer initialization relies on preprogrammed
register values.  These register values are changed to blank the
console.

Hence when using kexec to boot into a new kernel while the console is
blanked, the new kernel cannot determine the current video
configuration, and the Atari frame buffer driver fails to initialize:

    atafb: phys_screen_base 6ce000 screen_len 4096

Fix this by doing a straight-forward conversion of the driver to a
platform device driver, and adding a shutdown handler that unblanks the
display.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michael Schmitz <schmitzmic@gmail.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
This commit is contained in:
Geert Uytterhoeven 2019-04-01 17:46:55 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 577eabb2cb
commit 80cf96357d
1 changed files with 30 additions and 4 deletions
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34
drivers/video/fbdev/atafb.c
View File

@ -54,6 +54,7 @@
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <asm/setup.h>
#include <linux/uaccess.h>
@ -3072,7 +3073,7 @@ int __init atafb_setup(char *options)
return 0;
}
int __init atafb_init(void)
static int __init atafb_probe(struct platform_device *pdev)
{
int pad, detected_mode, error;
unsigned int defmode = 0;
@ -3084,9 +3085,6 @@ int __init atafb_init(void)
atafb_setup(option);
printk("atafb_init: start\n");
if (!MACH_IS_ATARI)
return -ENODEV;
do {
#ifdef ATAFB_EXT
if (external_addr) {
@ -3247,4 +3245,32 @@ int __init atafb_init(void)
return 0;
}
static void atafb_shutdown(struct platform_device *pdev)
{
/* Unblank before kexec */
if (fbhw->blank)
fbhw->blank(0);
}
static struct platform_driver atafb_driver = {
.shutdown = atafb_shutdown,
.driver = {
.name = "atafb",
},
};
static int __init atafb_init(void)
{
struct platform_device *pdev;
if (!MACH_IS_ATARI)
return -ENODEV;
pdev = platform_device_register_simple("atafb", -1, NULL, 0);
if (IS_ERR(pdev))
return PTR_ERR(pdev);
return platform_driver_probe(&atafb_driver, atafb_probe);
}
device_initcall(atafb_init);