[PATCH][help?] Radeonfb acpi resume

[Micheal Marineau <marineam@engr.orst.edu>]

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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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