linux-kernel - [PATCH 1/1] ACPI / tables: add DSDT AmlCode new declaration name support

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Date:   Tue, 13 Nov 2018 18:46:23 +0800
From:   Wang Dongsheng <dongsheng.wang@...-semitech.com>
To:     <robert.moore@...el.com>, <rjw@...ysocki.net>
CC:     <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Wang Dongsheng <dongsheng.wang@...-semitech.com>
Subject: [PATCH 1/1] ACPI / tables: add DSDT AmlCode new declaration name support

The new naming rule is added in acpica version 20180427.
So the dsdt aml code name changes from "AmlCode" to "dsdt_aml_code".

The patch that introduces naming rules is:
https://github.com/acpica/acpica/commit/f9a88a4c1cd020b6a5475d63b29626852a0b5f37

Tested:
ACPICA release version 20180427+.
ARM64: QCOM QDF2400
GCC: 4.8.5 20150623

Signed-off-by: Wang Dongsheng <dongsheng.wang@...-semitech.com>
---
 drivers/acpi/Kconfig  |  2 +-
 drivers/acpi/tables.c | 10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 9705fc986da9..15ab53a52fdc 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -336,7 +336,7 @@ config ACPI_CUSTOM_DSDT_FILE
 	  See Documentation/acpi/dsdt-override.txt
 
 	  Enter the full path name to the file which includes the AmlCode
-	  declaration.
+	  or dsdt_aml_code declaration.
 
 	  If unsure, don't enter a file name.
 
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index a3d012b08fc5..297020bbaade 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -713,6 +713,9 @@ acpi_os_physical_table_override(struct acpi_table_header *existing_table,
 					  table_length);
 }
 
+static void *amlcode __attribute__ ((weakref("AmlCode")));
+static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
+
 acpi_status
 acpi_os_table_override(struct acpi_table_header *existing_table,
 		       struct acpi_table_header **new_table)
@@ -723,8 +726,11 @@ acpi_os_table_override(struct acpi_table_header *existing_table,
 	*new_table = NULL;
 
 #ifdef CONFIG_ACPI_CUSTOM_DSDT
-	if (strncmp(existing_table->signature, "DSDT", 4) == 0)
-		*new_table = (struct acpi_table_header *)AmlCode;
+	if (!strncmp(existing_table->signature, "DSDT", 4)) {
+		*new_table = (struct acpi_table_header *)&amlcode;
+		if (!(*new_table))
+			*new_table = (struct acpi_table_header *)&dsdt_amlcode;
+	}
 #endif
 	if (*new_table != NULL)
 		acpi_table_taint(existing_table);
-- 
2.18.0