ACPI: Allow setting SCI_EN bit in PM1_CONTROL register

This is needed by at least the Mac Mini's, which (incorrectly) come back
from suspend with SCI_EN clear.

Thanks to Fr�d�ric Riss for hunting this down.

Acked-by: Fr�d�ric Riss <[e-mail]>
Cc: Pavel Machek <[e-mail]>
Cc: Len Brown <[e-mail]>
Cc: Arjan van de Ven <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/acpi/hardware/hwregs.c

···
 
 		/*
 		 * Perform a read first to preserve certain bits (per ACPI spec)
-		 *
-		 * Note: This includes SCI_EN, we never want to change this bit
 		 */
 		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
 					       ACPI_REGISTER_PM1_CONTROL,

include/acpi/aclocal.h

···
  * must be preserved.
  */
 #define ACPI_PM1_STATUS_PRESERVED_BITS          0x0800	/* Bit 11 */
-#define ACPI_PM1_CONTROL_PRESERVED_BITS         0x0201	/* Bit 9, Bit 0 (SCI_EN) */
+#define ACPI_PM1_CONTROL_PRESERVED_BITS         0x0200	/* Bit 9 (whatever) */
 
 /*
  * Register IDs