matroxfb: restore the registers M_ACCESS and M_PITCH

commit a772d4736641ec1b421ad965e13457c17379fc86 upstream.

When X11 is running and the user switches back to console, the card
modifies the content of registers M_MACCESS and M_PITCH in periodic
intervals.

This patch fixes it by restoring the content of these registers before
issuing any accelerator command.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 30 insertions, 10 deletions

diff --git a/drivers/video/matrox/matroxfb_accel.c b/drivers/video/matrox/matroxfb_accel.c
index 8335a6fe303e..0d5cb85d071a 100644
--- a/drivers/video/matrox/matroxfb_accel.c
+++ b/drivers/video/matrox/matroxfb_accel.c
@@ -192,10 +192,18 @@ void matrox_cfbX_init(struct matrox_fb_info *minfo)
         minfo->accel.m_dwg_rect = M_DWG_TRAP | M_DWG_SOLID | M_DWG_ARZERO | M_DWG_SGNZERO | M_DWG_SHIFTZERO;
         if (isMilleniumII(minfo)) minfo->accel.m_dwg_rect |= M_DWG_TRANSC;
         minfo->accel.m_opmode = mopmode;
+        minfo->accel.m_access = maccess;
+        minfo->accel.m_pitch = mpitch;
 }
 
 EXPORT_SYMBOL(matrox_cfbX_init);
 
+static void matrox_accel_restore_maccess(struct matrox_fb_info *minfo)
+{
+        mga_outl(M_MACCESS, minfo->accel.m_access);
+        mga_outl(M_PITCH, minfo->accel.m_pitch);
+}
+
 static void matrox_accel_bmove(struct matrox_fb_info *minfo, int vxres, int sy,
                                int sx, int dy, int dx, int height, int width)
 {
@@ -207,7 +215,8 @@ static void matrox_accel_bmove(struct matrox_fb_info *minfo, int vxres, int sy,
         CRITBEGIN
 
         if ((dy < sy) || ((dy == sy) && (dx <= sx))) {
-                mga_fifo(2);
+                mga_fifo(4);
+                matrox_accel_restore_maccess(minfo);
                 mga_outl(M_DWGCTL, M_DWG_BITBLT | M_DWG_SHIFTZERO | M_DWG_SGNZERO |
                          M_DWG_BFCOL | M_DWG_REPLACE);
                 mga_outl(M_AR5, vxres);
@@ -215,7 +224,8 @@ static void matrox_accel_bmove(struct matrox_fb_info *minfo, int vxres, int sy,
                 start = sy*vxres+sx+curr_ydstorg(minfo);
                 end = start+width;
         } else {
-                mga_fifo(3);
+                mga_fifo(5);
+                matrox_accel_restore_maccess(minfo);
                 mga_outl(M_DWGCTL, M_DWG_BITBLT | M_DWG_SHIFTZERO | M_DWG_BFCOL | M_DWG_REPLACE);
                 mga_outl(M_SGN, 5);
                 mga_outl(M_AR5, -vxres);
@@ -224,7 +234,8 @@ static void matrox_accel_bmove(struct matrox_fb_info *minfo, int vxres, int sy,
                 start = end+width;
                 dy += height-1;
         }
-        mga_fifo(4);
+        mga_fifo(6);
+        matrox_accel_restore_maccess(minfo);
         mga_outl(M_AR0, end);
         mga_outl(M_AR3, start);
         mga_outl(M_FXBNDRY, ((dx+width)<<16) | dx);
@@ -246,7 +257,8 @@ static void matrox_accel_bmove_lin(struct matrox_fb_info *minfo, int vxres,
         CRITBEGIN
 
         if ((dy < sy) || ((dy == sy) && (dx <= sx))) {
-                mga_fifo(2);
+                mga_fifo(4);
+                matrox_accel_restore_maccess(minfo);
                 mga_outl(M_DWGCTL, M_DWG_BITBLT | M_DWG_SHIFTZERO | M_DWG_SGNZERO |
                         M_DWG_BFCOL | M_DWG_REPLACE);
                 mga_outl(M_AR5, vxres);
@@ -254,7 +266,8 @@ static void matrox_accel_bmove_lin(struct matrox_fb_info *minfo, int vxres,
                 start = sy*vxres+sx+curr_ydstorg(minfo);
                 end = start+width;
         } else {
-                mga_fifo(3);
+                mga_fifo(5);
+                matrox_accel_restore_maccess(minfo);
                 mga_outl(M_DWGCTL, M_DWG_BITBLT | M_DWG_SHIFTZERO | M_DWG_BFCOL | M_DWG_REPLACE);
                 mga_outl(M_SGN, 5);
                 mga_outl(M_AR5, -vxres);
@@ -263,7 +276,8 @@ static void matrox_accel_bmove_lin(struct matrox_fb_info *minfo, int vxres,
                 start = end+width;
                 dy += height-1;
         }
-        mga_fifo(5);
+        mga_fifo(7);
+        matrox_accel_restore_maccess(minfo);
         mga_outl(M_AR0, end);
         mga_outl(M_AR3, start);
         mga_outl(M_FXBNDRY, ((dx+width)<<16) | dx);
@@ -298,7 +312,8 @@ static void matroxfb_accel_clear(struct matrox_fb_info *minfo, u_int32_t color,
 
         CRITBEGIN
 
-        mga_fifo(5);
+        mga_fifo(7);
+        matrox_accel_restore_maccess(minfo);
         mga_outl(M_DWGCTL, minfo->accel.m_dwg_rect | M_DWG_REPLACE);
         mga_outl(M_FCOL, color);
         mga_outl(M_FXBNDRY, ((sx + width) << 16) | sx);
@@ -341,7 +356,8 @@ static void matroxfb_cfb4_clear(struct matrox_fb_info *minfo, u_int32_t bgx,
         width >>= 1;
         sx >>= 1;
         if (width) {
-                mga_fifo(5);
+                mga_fifo(7);
+                matrox_accel_restore_maccess(minfo);
                 mga_outl(M_DWGCTL, minfo->accel.m_dwg_rect | M_DWG_REPLACE2);
                 mga_outl(M_FCOL, bgx);
                 mga_outl(M_FXBNDRY, ((sx + width) << 16) | sx);
@@ -415,7 +431,8 @@ static void matroxfb_1bpp_imageblit(struct matrox_fb_info *minfo, u_int32_t fgx,
 
         CRITBEGIN
 
-        mga_fifo(3);
+        mga_fifo(5);
+        matrox_accel_restore_maccess(minfo);
         if (easy)
                 mga_outl(M_DWGCTL, M_DWG_ILOAD | M_DWG_SGNZERO | M_DWG_SHIFTZERO | M_DWG_BMONOWF | M_DWG_LINEAR | M_DWG_REPLACE);
         else
@@ -425,7 +442,8 @@ static void matroxfb_1bpp_imageblit(struct matrox_fb_info *minfo, u_int32_t fgx,
         fxbndry = ((xx + width - 1) << 16) | xx;
         mmio = minfo->mmio.vbase;
 
-        mga_fifo(6);
+        mga_fifo(8);
+        matrox_accel_restore_maccess(minfo);
         mga_writel(mmio, M_FXBNDRY, fxbndry);
         mga_writel(mmio, M_AR0, ar0);
         mga_writel(mmio, M_AR3, 0);
diff --git a/drivers/video/matrox/matroxfb_base.h b/drivers/video/matrox/matroxfb_base.h
index 11ed57bb704e..556d96ce40bf 100644
--- a/drivers/video/matrox/matroxfb_base.h
+++ b/drivers/video/matrox/matroxfb_base.h
@@ -307,6 +307,8 @@ struct matrox_accel_data {
 #endif
         u_int32_t       m_dwg_rect;
         u_int32_t       m_opmode;
+        u_int32_t       m_access;
+        u_int32_t       m_pitch;
 };
 
 struct v4l2_queryctrl;