[PATCH][help?] Radeonfb acpi resume
From: Micheal Marineau (marineam_at_engr.orst.edu)
Date: 07/11/05
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Date: Sun, 10 Jul 2005 15:19:13 -0700 To: linux-kernel@vger.kernel.org
I've been forward porting this patch for a while now and need
some input on it. You can see the last time someone posted it
to the list here:
http://www.ussg.iu.edu/hypermail/linux/kernel/0410.0/0600.html
The big issue mentioned in that thread, that it reqires a key
press during the resume process to keep going still exists and
I have been unable to understand why. The issue is in radeon_pm.c
in this block that follows the last hunk of the diff:
if (rinfo->no_schedule) {
if (try_acquire_console_sem())
return 0;
} else
acquire_console_sem();
Specificly it's acquire_console_sem(); where the resume stops waiting
for a key press. What could be stopping things?
btw, I also have a suspend2 friendly version of the patch:
http://dev.gentoo.org/~marineam/files/patch-radeonfb-2.6.12-suspend2
diff -ru linux-2.6.12.orig/arch/i386/kernel/acpi/sleep.c
linux-2.6.12/arch/i386/kernel/acpi/sleep.c
--- linux-2.6.12.orig/arch/i386/kernel/acpi/sleep.c 2005-06-17
12:48:29.000000000 -0700
+++ linux-2.6.12/arch/i386/kernel/acpi/sleep.c 2005-07-03
18:01:34.000000000 -0700
@@ -5,6 +5,7 @@
* Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz>
*/
+#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <asm/smp.h>
@@ -55,6 +56,31 @@
zap_low_mappings();
}
+/*
+ * acpi_vgapost
+ */
+
+extern void do_vgapost_lowlevel (unsigned long);
+
+void acpi_vgapost (unsigned long slot)
+{
+ unsigned long flags, saved_video_flags = acpi_video_flags;
+ acpi_video_flags = (slot & 0xffff) << 16 | 1;
+ /* Map low memory and copy information */
+ init_low_mapping(swapper_pg_dir, USER_PTRS_PER_PGD);
+ memcpy((void *) acpi_wakeup_address, &wakeup_start, &wakeup_end -
&wakeup_start);
+ acpi_copy_wakeup_routine(acpi_wakeup_address);
+ /* Tunnel thru real mode */
+ local_irq_save(flags);
+ do_vgapost_lowlevel(acpi_wakeup_address);
+ local_irq_restore(flags);
+ /* Restore mapping etc */
+ zap_low_mappings();
+ acpi_video_flags = saved_video_flags;
+}
+
+EXPORT_SYMBOL (acpi_vgapost);
+
/**
* acpi_reserve_bootmem - do _very_ early ACPI initialisation
*
diff -ru linux-2.6.12.orig/arch/i386/kernel/acpi/wakeup.S
linux-2.6.12/arch/i386/kernel/acpi/wakeup.S
--- linux-2.6.12.orig/arch/i386/kernel/acpi/wakeup.S 2005-06-17
12:48:29.000000000 -0700
+++ linux-2.6.12/arch/i386/kernel/acpi/wakeup.S 2005-07-03
18:01:34.000000000 -0700
@@ -170,6 +170,32 @@
_setbad: jmp setbad
+#
+# Real mode switch - verbatim from reboot.c
+#
+go_real:
+ movl %cr0, %eax
+ andl $0x00000011, %eax
+ orl $0x60000000, %eax
+ movl %eax, %cr0
+ movl %eax, %cr3
+ movl %cr0, %ebx
+ andl $0x60000000, %ebx
+ jz 1f
+ wbinvd
+1: andb $0x10, %al
+ movl %eax, %cr0
+go_real_jmp: .byte 0xea
+go_real_jmp_off: .word 0x0000
+go_real_jmp_seg: .word 0x0000
+#
+# Real mode descriptor table
+#
+ .align 8
+go_real_desc: .quad 0x0000000000000000
+go_real_cseg: .quad 0x00009a000000ffff
+go_real_dseg: .quad 0x000092000000ffff
+
.code32
ALIGN
@@ -309,6 +335,59 @@
call acpi_enter_sleep_state_s4bios
ret
+ENTRY(do_vgapost_lowlevel)
+ # Convert target offset to physical address
+ movl %eax, %ecx
+ subl $__PAGE_OFFSET, %ecx
+ # Fixup GDT pointer
+ movl %ecx, %edx
+ addl $go_real_desc - wakeup_start, %edx
+ movl %edx, go_real_gdt + 2
+ # Fixup 16-bit CS descriptor
+ movl %ecx, %edx
+ movw %dx, go_real_cseg - wakeup_start + 2 (%eax)
+ shrl $16, %edx
+ movb %dl, go_real_cseg - wakeup_start + 4 (%eax)
+ movb %dh, go_real_cseg - wakeup_start + 7 (%eax)
+ # Fixup 16-bit jump
+ movl %ecx, %edx
+ shrl $4, %edx
+ movw %dx, go_real_jmp_seg - wakeup_start (%eax)
+ # Save state and registers
+ call save_processor_state
+ call save_registers
+ # Reload page table with low mapping
+ movl $swapper_pg_dir-__PAGE_OFFSET, %eax
+ movl %eax, %cr3
+ # Load IDTR and GDTR for real mode
+ lidt go_real_idt
+ lgdt go_real_gdt
+ # Load DS & al
+ movl $0x0010, %eax
+ movl %eax, %ss
+ movl %eax, %ds
+ movl %eax, %es
+ movl %eax, %fs
+ movl %eax, %gs
+ # Load CS
+ call $0x0008, $(go_real - wakeup_start)
+ # Phony return code
+ call restore_registers
+ call restore_processor_state
+ ret
+
+ .align 4
+ .word 0
+go_real_idt:
+ .word 0x3ff
+ .long 0
+
+ .align 4
+ .word 0
+go_real_gdt:
+ .word 3*8-1
+ .long 0
+
ALIGN
# saved registers
saved_gdt: .long 0,0
diff -ru linux-2.6.12.orig/drivers/video/aty/radeon_pm.c
linux-2.6.12/drivers/video/aty/radeon_pm.c
--- linux-2.6.12.orig/drivers/video/aty/radeon_pm.c 2005-06-17
12:48:29.000000000 -0700
+++ linux-2.6.12/drivers/video/aty/radeon_pm.c 2005-07-03
19:55:36.000000000 -0700
@@ -2606,10 +2606,13 @@
done:
pdev->dev.power.power_state = state;
+ pci_save_state (pdev);
return 0;
}
+extern void acpi_vgapost (unsigned long slot);
+
int radeonfb_pci_resume(struct pci_dev *pdev)
{
struct fb_info *info = pci_get_drvdata(pdev);
@@ -2619,6 +2622,12 @@
if (pdev->dev.power.power_state == 0)
return 0;
+ if (pdev->dev.power.power_state != 4)
+ {
+ pci_restore_state (pdev);
+ acpi_vgapost (pdev->devfn);
+ }
+
if (rinfo->no_schedule) {
if (try_acquire_console_sem())
return 0;
-- Michael Marineau marineam@engr.orst.edu Oregon State University
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- Previous message: Olaf Hering: "[PATCH 40/82] remove linux/version.h from drivers/scsi/ips"
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- Reply: Micheal Marineau: "Re: [PATCH][help?] Radeonfb acpi resume"
- Maybe reply: Micheal Marineau: "Re: [PATCH][help?] Radeonfb acpi resume"
- Reply: Benjamin Herrenschmidt: "Re: [PATCH][help?] Radeonfb acpi resume"
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