cirrusfb: Laguna chipset 8bpp fix

Fix 8bpp mode by adding handling of the Laguna chipsets to various places
and stop trashing a HDR register which probably does not exist on the
Laguna.

Fix compilation warnings about uninitialized variables also.

Finally, all 8bpp, 16bpp and 32bpp modes work on the Laguna chipset.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 21 insertions, 14 deletions

diff --git a/drivers/video/cirrusfb.c b/drivers/video/cirrusfb.c
index 9e52db7d333..12f45520e5d 100644
--- a/drivers/video/cirrusfb.c
+++ b/drivers/video/cirrusfb.c
@@ -660,7 +660,7 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
         int yres, vdispend, vsyncstart, vsyncend, vtotal;
         long freq;
         int nom, den, div;
-        unsigned int control, format, threshold;
+        unsigned int control = 0, format = 0, threshold = 0;
 
         dev_dbg(info->device, "Requested mode: %dx%dx%d\n",
                var->xres, var->yres, var->bits_per_pixel);
@@ -842,8 +842,7 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
                 threshold = fb_readw(cinfo->laguna_mmio + 0xea);
                 control &= ~0x6800;
                 format = 0;
-                threshold &= 0xffe0;
-                threshold &= 0x3fbf;
+                threshold &= 0xffe0 & 0x3fbf;
         }
         if (nom) {
                 tmp = den << 1;
@@ -893,6 +892,8 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
                 tmp |= 0x40;
         if (var->sync & FB_SYNC_VERT_HIGH_ACT)
                 tmp |= 0x80;
+        if (cinfo->btype == BT_LAGUNA)
+                tmp |= 0xc;
         WGen(cinfo, VGA_MIS_W, tmp);
 
         /* Screen A Preset Row-Scan register */
@@ -1228,9 +1229,7 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
         if (cirrusfb_board_info[cinfo->btype].scrn_start_bit19)
                 vga_wcrt(regbase, CL_CRT1D, (pitch >> 9) & 1);
 
-        if (cinfo->btype == BT_LAGUNA ||
-            cinfo->btype == BT_GD5480) {
-
+        if (cinfo->btype == BT_LAGUNA) {
                 tmp = 0;
                 if ((htotal + 5) & 256)
                         tmp |= 128;
@@ -1360,7 +1359,8 @@ static int cirrusfb_pan_display(struct fb_var_screeninfo *var,
                 xpix = (unsigned char) ((xoffset % 4) * 2);
         }
 
-        cirrusfb_WaitBLT(cinfo->regbase); /* make sure all the BLT's are done */
+        if (cinfo->btype != BT_LAGUNA)
+                cirrusfb_WaitBLT(cinfo->regbase);
 
         /* lower 8 + 8 bits of screen start address */
         vga_wcrt(cinfo->regbase, VGA_CRTC_START_LO,
@@ -1394,7 +1394,8 @@ static int cirrusfb_pan_display(struct fb_var_screeninfo *var,
         if (info->var.bits_per_pixel == 1)
                 vga_wattr(cinfo->regbase, CL_AR33, xpix);
 
-        cirrusfb_WaitBLT(cinfo->regbase);
+        if (cinfo->btype != BT_LAGUNA)
+                cirrusfb_WaitBLT(cinfo->regbase);
 
         return 0;
 }
@@ -1513,6 +1514,7 @@ static void init_vgachip(struct fb_info *info)
                 vga_wgfx(cinfo->regbase, CL_GR2F, 0x00);
                 break;
 
+        case BT_LAGUNA:
         case BT_ALPINE:
                 /* Nothing to do to reset the board. */
                 break;
@@ -1538,7 +1540,7 @@ static void init_vgachip(struct fb_info *info)
                         WGen(cinfo, CL_VSSM2, 0x01);
 
                 /* reset sequencer logic */
-                vga_wseq(cinfo->regbase, CL_SEQR0, 0x03);
+                vga_wseq(cinfo->regbase, VGA_SEQ_RESET, 0x03);
 
                 /* FullBandwidth (video off) and 8/9 dot clock */
                 vga_wseq(cinfo->regbase, VGA_SEQ_CLOCK_MODE, 0x21);
@@ -1560,6 +1562,7 @@ static void init_vgachip(struct fb_info *info)
                         vga_wseq(cinfo->regbase, CL_SEQRF, 0x98);
                         break;
                 case BT_ALPINE:
+                case BT_LAGUNA:
                         break;
                 case BT_SD64:
                         vga_wseq(cinfo->regbase, CL_SEQRF, 0xb8);
@@ -1648,7 +1651,8 @@ static void init_vgachip(struct fb_info *info)
         vga_wgfx(cinfo->regbase, VGA_GFX_COMPARE_MASK, 0x0f);
         /* Bit Mask: no mask at all */
         vga_wgfx(cinfo->regbase, VGA_GFX_BIT_MASK, 0xff);
-        if (cinfo->btype == BT_ALPINE)
+
+        if (cinfo->btype == BT_ALPINE || cinfo->btype == BT_LAGUNA)
                 /* (5434 can't have bit 3 set for bitblt) */
                 vga_wgfx(cinfo->regbase, CL_GRB, 0x20);
         else
@@ -1845,7 +1849,8 @@ static void cirrusfb_imageblit(struct fb_info *info,
 {
         struct cirrusfb_info *cinfo = info->par;
 
-        cirrusfb_WaitBLT(cinfo->regbase);
+        if (cinfo->btype != BT_LAGUNA)
+                cirrusfb_WaitBLT(cinfo->regbase);
         cfb_imageblit(info, image);
 }
 
@@ -1992,7 +1997,7 @@ static int __devinit cirrusfb_set_fbinfo(struct fb_info *info)
                     | FBINFO_HWACCEL_YPAN
                     | FBINFO_HWACCEL_FILLRECT
                     | FBINFO_HWACCEL_COPYAREA;
-        if (noaccel)
+        if (noaccel || cinfo->btype == BT_LAGUNA)
                 info->flags |= FBINFO_HWACCEL_DISABLED;
         info->fbops = &cirrusfb_ops;
         if (cinfo->btype == BT_GD5480) {
@@ -2481,6 +2486,8 @@ static void WHDR(const struct cirrusfb_info *cinfo, unsigned char val)
 {
         unsigned char dummy;
 
+        if (cinfo->btype == BT_LAGUNA)
+                return;
         if (cinfo->btype == BT_PICASSO) {
                 /* Klaus' hint for correct access to HDR on some boards */
                 /* first write 0 to pixel mask (3c6) */
@@ -2548,7 +2555,8 @@ static void WClut(struct cirrusfb_info *cinfo, unsigned char regnum, unsigned ch
         vga_w(cinfo->regbase, VGA_PEL_IW, regnum);
 
         if (cinfo->btype == BT_PICASSO || cinfo->btype == BT_PICASSO4 ||
-            cinfo->btype == BT_ALPINE || cinfo->btype == BT_GD5480) {
+            cinfo->btype == BT_ALPINE || cinfo->btype == BT_GD5480 ||
+            cinfo->btype == BT_LAGUNA) {
                 /* but DAC data register IS, at least for Picasso II */
                 if (cinfo->btype == BT_PICASSO)
                         data += 0xfff;
diff --git a/include/video/cirrus.h b/include/video/cirrus.h
index a1b7985b6b2..9a5e9ee3078 100644
--- a/include/video/cirrus.h
+++ b/include/video/cirrus.h
@@ -32,7 +32,6 @@
 #define CL_VSSM2        0x3c3   /* Motherboard Sleep */
 
 /*** VGA Sequencer Registers ***/
-#define CL_SEQR0        0x0     /* Reset */
 /* the following are from the "extension registers" group */
 #define CL_SEQR6        0x6     /* Unlock ALL Extensions */
 #define CL_SEQR7        0x7     /* Extended Sequencer Mode */