From: Lin Ming <ming.m.lin@intel.com>
Date: Thu, 8 Apr 2010 06:34:27 +0000 (+0800)
Subject: ACPI: add boot option acpi=copy_dsdt to fix corrupt DSDT
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=aa2110cb1a7510f9b834adfb39b05d4843a35d35;p=openwrt%2Fstaging%2Fblogic.git

ACPI: add boot option acpi=copy_dsdt to fix corrupt DSDT

Some BIOS on Toshiba machines corrupt the DSDT, so add a new
boot option acpi=copy_dsdt to workaround it.
Add warning message to ask users to use this option if corrupt DSDT detected.

Also build a DMI blacklist to check it and automatically copy DSDT.

https://bugzilla.kernel.org/show_bug.cgi?id=14679

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e2202e93b148..93f113a1b326 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -151,6 +151,7 @@ and is between 256 and 4096 characters. It is defined in the file
 			strict -- Be less tolerant of platforms that are not
 				strictly ACPI specification compliant.
 			rsdt -- prefer RSDT over (default) XSDT
+			copy_dsdt -- copy DSDT to memory
 
 			See also Documentation/power/pm.txt, pci=noacpi
 
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index cd40aba6aa95..b9629384263c 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1576,6 +1576,10 @@ static int __init parse_acpi(char *arg)
 	/* "acpi=noirq" disables ACPI interrupt routing */
 	else if (strcmp(arg, "noirq") == 0) {
 		acpi_noirq_set();
+	}
+	/* "acpi=copy_dsdt" copys DSDT */
+	else if (strcmp(arg, "copy_dsdt") == 0) {
+		acpi_gbl_copy_dsdt_locally = 1;
 	} else {
 		/* Core will printk when we return error. */
 		return -EINVAL;
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 54a8712bae62..a9b105fc2e55 100644
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -373,6 +373,10 @@ void acpi_tb_check_dsdt_header(void)
 		acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
 		acpi_tb_print_table_header(0, acpi_gbl_DSDT);
 
+		ACPI_ERROR((AE_INFO,
+			    "Please send DMI info to linux-acpi@vger.kernel.org\n"
+			    "If system does not work as expected, please boot with acpi=copy_dsdt"));
+
 		/* Disable further error messages */
 
 		acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length;
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 37132dc2da03..49af19bb8c9b 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -69,6 +69,37 @@ static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
 };
 
 
+static int set_copy_dsdt(const struct dmi_system_id *id)
+{
+	printk(KERN_NOTICE "%s detected - "
+		"force copy of DSDT to local memory\n", id->ident);
+	acpi_gbl_copy_dsdt_locally = 1;
+	return 0;
+}
+
+static struct dmi_system_id dsdt_dmi_table[] __initdata = {
+	/*
+	 * Insyde BIOS on some TOSHIBA machines corrupt the DSDT.
+	 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
+	 */
+	{
+	 .callback = set_copy_dsdt,
+	 .ident = "TOSHIBA Satellite A505",
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "Satellite A505"),
+		},
+	},
+	{
+	 .callback = set_copy_dsdt,
+	 .ident = "TOSHIBA Satellite L505D",
+	 .matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L505D"),
+		},
+	}
+};
+
 /* --------------------------------------------------------------------------
                                 Device Management
    -------------------------------------------------------------------------- */
@@ -813,6 +844,12 @@ void __init acpi_early_init(void)
 
 	acpi_gbl_permanent_mmap = 1;
 
+	/*
+	 * If the machine falls into the DMI check table,
+	 * DSDT will be copied to memory
+	 */
+	dmi_check_system(dsdt_dmi_table);
+
 	status = acpi_reallocate_root_table();
 	if (ACPI_FAILURE(status)) {
 		printk(KERN_ERR PREFIX