samsung-laptop: tweak traces

- don't output error when probing features at load
- print the SABI signature if samsung_sabi_init()
  succeed

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c
index b41c7b4f9c7..5047642d166 100644
--- a/drivers/platform/x86/samsung-laptop.c
+++ b/drivers/platform/x86/samsung-laptop.c
@@ -366,10 +366,11 @@ static int sabi_command(struct samsung_laptop *samsung, u16 command,
 
         if (debug) {
                 if (in)
-                        pr_info("SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}",
+                        pr_info("SABI command:0x%04x "
+                                "data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
                                 command, in->d0, in->d1, in->d2, in->d3);
                 else
-                        pr_info("SABI 0x%04x", command);
+                        pr_info("SABI command:0x%04x", command);
         }
 
         /* enable memory to be able to write to it */
@@ -393,10 +394,17 @@ static int sabi_command(struct samsung_laptop *samsung, u16 command,
         /* see if the command actually succeeded */
         complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
         iface_data = readb(samsung->sabi_iface + SABI_IFACE_DATA);
-        if (complete != 0xaa || iface_data == 0xff) {
+
+        /* iface_data = 0xFF happens when a command is not known
+         * so we only add a warning in debug mode since we will
+         * probably issue some unknown command at startup to find
+         * out which features are supported */
+        if (complete != 0xaa || (iface_data == 0xff && debug))
                 pr_warn("SABI command 0x%04x failed with"
                         " completion flag 0x%02x and interface data 0x%02x",
                         command, complete, iface_data);
+
+        if (complete != 0xaa || iface_data == 0xff) {
                 ret = -EINVAL;
                 goto exit;
         }
@@ -409,7 +417,7 @@ static int sabi_command(struct samsung_laptop *samsung, u16 command,
         }
 
         if (debug && out) {
-                pr_info("SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}",
+                pr_info("SABI return data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
                         out->d0, out->d1, out->d2, out->d3);
         }
 
@@ -1370,6 +1378,9 @@ static int __init samsung_sabi_init(struct samsung_laptop *samsung)
         if (samsung->handle_backlight)
                 check_for_stepping_quirk(samsung);
 
+        pr_info("detected SABI interface: %s\n",
+                samsung->config->test_string);
+
 exit:
         if (ret)
                 samsung_sabi_exit(samsung);