sisfb: add RAM type detection for XGI Z9

Detect the XGI Z9 RAM type as "documented" by the XGI's xgifb driver.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Thomas Winischhofer <thomas@winischhofer.net>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/video/sis/sis_main.c b/drivers/video/sis/sis_main.c
index f0c48e84bcdb..de0356788375 100644
--- a/drivers/video/sis/sis_main.c
+++ b/drivers/video/sis/sis_main.c
@@ -4955,7 +4955,13 @@ sisfb_post_xgi_ramtype(struct sis_video_info *ivideo)
                 v1 = bios[0x1d2];
         }
         if (!(ramtype & 0x80)) {
-                if (ivideo->chip == XGI_20) {
+                if (sisfb_xgi_is21(ivideo)) {
+                        SiS_SetRegAND(SISCR, 0xb4, 0xfd); /* GPIO control */
+                        SiS_SetRegOR(SISCR, 0x4a, 0x80);  /* GPIOH EN */
+                        reg = SiS_GetReg(SISCR, 0x48);
+                        SiS_SetRegOR(SISCR, 0xb4, 0x02);
+                        ramtype = reg & 0x01;             /* GPIOH */
+                } else if (ivideo->chip == XGI_20) {
                         SiS_SetReg(SISCR, 0x97, v1);
                         reg = SiS_GetReg(SISCR, 0x97);
                         if (reg & 0x10) {