ACPI / EC: Add detailed fields debugging support of EC_SC(R).

Developers really don't need to translate EC_SC(R) in mind as long as the
field details are decoded in the debugging message.

Tested-by: Gareth Williams <gareth@garethwilliams.me.uk>
Tested-by: Steffen Weber <steffen.weber@gmail.com>
Tested-by: Hans de Goede <jwrdegoede@fedoraproject.org>
Tested-by: Arthur Chen <axchen@nvidia.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 12 insertions, 4 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index f8fb736e38df..ff16132e5c52 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -55,6 +55,7 @@
 /* EC status register */
 #define ACPI_EC_FLAG_OBF        0x01    /* Output buffer full */
 #define ACPI_EC_FLAG_IBF        0x02    /* Input buffer full */
+#define ACPI_EC_FLAG_CMD        0x08    /* Input buffer contains a command */
 #define ACPI_EC_FLAG_BURST      0x10    /* burst mode */
 #define ACPI_EC_FLAG_SCI        0x20    /* EC-SCI occurred */
 
@@ -133,26 +134,33 @@ static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */
 static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
 {
         u8 x = inb(ec->command_addr);
-        pr_debug("---> status = 0x%2.2x\n", x);
+        pr_debug("EC_SC(R) = 0x%2.2x "
+                 "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d\n",
+                 x,
+                 !!(x & ACPI_EC_FLAG_SCI),
+                 !!(x & ACPI_EC_FLAG_BURST),
+                 !!(x & ACPI_EC_FLAG_CMD),
+                 !!(x & ACPI_EC_FLAG_IBF),
+                 !!(x & ACPI_EC_FLAG_OBF));
         return x;
 }
 
 static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
 {
         u8 x = inb(ec->data_addr);
-        pr_debug("---> data = 0x%2.2x\n", x);
+        pr_debug("EC_DATA(R) = 0x%2.2x\n", x);
         return x;
 }
 
 static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
 {
-        pr_debug("<--- command = 0x%2.2x\n", command);
+        pr_debug("EC_SC(W) = 0x%2.2x\n", command);
         outb(command, ec->command_addr);
 }
 
 static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
 {
-        pr_debug("<--- data = 0x%2.2x\n", data);
+        pr_debug("EC_DATA(W) = 0x%2.2x\n", data);
         outb(data, ec->data_addr);
 }