---

yaml --- r: 141861 b: refs/heads/master c: 20869dc h: refs/heads/master i: 141859: 5cf7ee1 v: v3
git-mirror · Mar 27, 2009 · 83e1481 · 83e1481
1 parent 5faae65
commit 83e1481
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Showing 3 changed files with 25 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8636f8d257b3edf5a1529df93119cdc630ed85c7
+refs/heads/master: 20869dcfde204e1c21b642608d708d82472fee2b
diff --git a/trunk/drivers/acpi/acpica/aclocal.h b/trunk/drivers/acpi/acpica/aclocal.h
@@ -780,7 +780,15 @@ struct acpi_bit_register_info {
  * must be preserved.
  */
 #define ACPI_PM1_STATUS_PRESERVED_BITS          0x0800	/* Bit 11 */
-#define ACPI_PM1_CONTROL_PRESERVED_BITS         0x0200	/* Bit 9 (whatever) */
+
+/* For control registers, both ignored and reserved bits must be preserved */
+
+#define ACPI_PM1_CONTROL_IGNORED_BITS           0x0201	/* Bits 9, 0(SCI_EN) */
+#define ACPI_PM1_CONTROL_RESERVED_BITS          0xC1F8	/* Bits 14-15, 3-8 */
+#define ACPI_PM1_CONTROL_PRESERVED_BITS \
+	       (ACPI_PM1_CONTROL_IGNORED_BITS | ACPI_PM1_CONTROL_RESERVED_BITS)
+
+#define ACPI_PM2_CONTROL_PRESERVED_BITS         0xFFFFFFFE	/* All except bit 0 */
 
 /*
  * Register IDs

diff --git a/trunk/drivers/acpi/acpica/hwregs.c b/trunk/drivers/acpi/acpica/hwregs.c
@@ -328,6 +328,21 @@ acpi_status acpi_hw_register_write(u32 register_id, u32 value)
 
 	case ACPI_REGISTER_PM2_CONTROL:	/* 8-bit access */
 
+		/*
+		 * For control registers, all reserved bits must be preserved,
+		 * as per the ACPI spec.
+		 */
+		status =
+		    acpi_read(&read_value, &acpi_gbl_FADT.xpm2_control_block);
+		if (ACPI_FAILURE(status)) {
+			goto exit;
+		}
+
+		/* Insert the bits to be preserved */
+
+		ACPI_INSERT_BITS(value, ACPI_PM2_CONTROL_PRESERVED_BITS,
+				 read_value);
+
 		status = acpi_write(value, &acpi_gbl_FADT.xpm2_control_block);
 		break;