x86, geode: add a VSA2 ID for General Software

General Software writes their own VSA2 module for their version
of the Geode BIOS, which returns a different ID then the standard
VSA2.  This was causing the framebuffer driver to break for most
GSW boards.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Cc: tglx@linutronix.de
Cc: linux-geode@lists.infradead.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 6 insertions, 3 deletions

diff --git a/arch/x86/kernel/geode_32.c b/arch/x86/kernel/geode_32.c
index e8edd63ab000..9b08e852fd1a 100644
--- a/arch/x86/kernel/geode_32.c
+++ b/arch/x86/kernel/geode_32.c
@@ -166,6 +166,8 @@ int geode_has_vsa2(void)
         static int has_vsa2 = -1;
 
         if (has_vsa2 == -1) {
+                u16 val;
+
                 /*
                  * The VSA has virtual registers that we can query for a
                  * signature.
@@ -173,7 +175,8 @@ int geode_has_vsa2(void)
                 outw(VSA_VR_UNLOCK, VSA_VRC_INDEX);
                 outw(VSA_VR_SIGNATURE, VSA_VRC_INDEX);
 
-                has_vsa2 = (inw(VSA_VRC_DATA) == VSA_SIG);
+                val = inw(VSA_VRC_DATA);
+                has_vsa2 = (val == AMD_VSA_SIG || val == GSW_VSA_SIG);
         }
 
         return has_vsa2;
diff --git a/include/asm-x86/geode.h b/include/asm-x86/geode.h
index 6e6458853a36..bb06027fc83e 100644
--- a/include/asm-x86/geode.h
+++ b/include/asm-x86/geode.h
@@ -112,8 +112,8 @@ extern int geode_get_dev_base(unsigned int dev);
 #define VSA_VR_UNLOCK           0xFC53  /* unlock virtual register */
 #define VSA_VR_SIGNATURE        0x0003
 #define VSA_VR_MEM_SIZE         0x0200
-#define VSA_SIG                 0x4132  /* signature is ascii 'VSA2' */
-
+#define AMD_VSA_SIG             0x4132  /* signature is ascii 'VSA2' */
+#define GSW_VSA_SIG             0x534d  /* General Software signature */
 /* GPIO */
 
 #define GPIO_OUTPUT_VAL         0x00