ibm_newemac: Fixes kernel crashes when speed of cable connected changes

[linux-2.6] / drivers / video / geode / display_gx.c

diff --git a/drivers/video/geode/display_gx.c b/drivers/video/geode/display_gx.c
index 1e82ecc367dd259cf78863a6a32a5df6b65985f7..e759895bf3d3d19deb02ec6323f7c8ff646b96fc 100644 (file)
--- a/drivers/video/geode/display_gx.c
+++ b/drivers/video/geode/display_gx.c
@@ -25,7 +25,23 @@ unsigned int gx_frame_buffer_size(void)
 {
        unsigned int val;
 
-       /* FB size is reported by a virtual register */
+       if (!geode_has_vsa2()) {
+               uint32_t hi, lo;
+
+               /* The number of pages is (PMAX - PMIN)+1 */
+               rdmsr(MSR_GLIU_P2D_RO0, lo, hi);
+
+               /* PMAX */
+               val = ((hi & 0xff) << 12) | ((lo & 0xfff00000) >> 20);
+               /* PMIN */
+               val -= (lo & 0x000fffff);
+               val += 1;
+
+               /* The page size is 4k */
+               return (val << 12);
+       }
+
+       /* FB size can be obtained from the VSA II */
        /* Virtual register class = 0x02 */
        /* VG_MEM_SIZE(512Kb units) = 0x00 */