viafb: rework color setting

This is a rewritten version of viafb_setcolreg.  The hardware register
writes were split up and moved to hw.c where they belong as this is really
low level stuff.  It was made dual fb aware.

Furthermore viafb_setcmap was removed as the problem with 8bpp originated
from a bug in writing multiple color registers at once.  The removal of
viafb_setcmap might introduce a small performance regression but its
certainly better to receive the correct result a bit slower than a garbled
picture fast.  It should give us a working 8bpp mode and is more
extensible than the old hardcoded code.  No other regressions are expected
but as the hardware might be a bit picky it might cause some regressions
in 8bpp mode on some hardware although I doubt that.

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Joseph Chan <JosephChan@via.com.tw>
Cc: Scott Fang <ScottFang@viatech.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 51 insertions, 216 deletions

diff --git a/drivers/video/via/hw.c b/drivers/video/via/hw.c
index 47d9024d7c30..1823253a6f40 100644
--- a/drivers/video/via/hw.c
+++ b/drivers/video/via/hw.c
@@ -691,7 +691,7 @@ void viafb_set_primary_color_depth(u8 depth)
 
         DEBUG_MSG(KERN_DEBUG "viafb_set_primary_color_depth(%d)\n", depth);
         switch (depth) {
-        case 6:
+        case 8:
                 value = 0x00;
                 break;
         case 16:
@@ -715,7 +715,7 @@ void viafb_set_secondary_color_depth(u8 depth)
 
         DEBUG_MSG(KERN_DEBUG "viafb_set_secondary_color_depth(%d)\n", depth);
         switch (depth) {
-        case 6:
+        case 8:
                 value = 0x00;
                 break;
         case 16:
@@ -733,6 +733,27 @@ void viafb_set_secondary_color_depth(u8 depth)
         viafb_write_reg_mask(0x67, VIACR, value, 0xC0);
 }
 
+static void set_color_register(u8 index, u8 red, u8 green, u8 blue)
+{
+        outb(0xFF, 0x3C6); /* bit mask of palette */
+        outb(index, 0x3C8);
+        outb(red, 0x3C9);
+        outb(green, 0x3C9);
+        outb(blue, 0x3C9);
+}
+
+void viafb_set_primary_color_register(u8 index, u8 red, u8 green, u8 blue)
+{
+        viafb_write_reg_mask(0x1A, VIASR, 0x00, 0x01);
+        set_color_register(index, red, green, blue);
+}
+
+void viafb_set_secondary_color_register(u8 index, u8 red, u8 green, u8 blue)
+{
+        viafb_write_reg_mask(0x1A, VIASR, 0x01, 0x01);
+        set_color_register(index, red, green, blue);
+}
+
 void viafb_set_output_path(int device, int set_iga, int output_interface)
 {
         switch (device) {
@@ -2210,8 +2231,7 @@ int viafb_setmode(struct VideoModeTable *vmode_tbl, int video_bpp,
                 outb(VPIT.SR[i - 1], VIASR + 1);
         }
 
-        viafb_write_reg_mask(0x15, VIASR, viafbinfo->fix.visual
-                == FB_VISUAL_PSEUDOCOLOR ? 0x22 : 0xA2, 0xA2);
+        viafb_write_reg_mask(0x15, VIASR, 0xA2, 0xA2);
         viafb_set_iga_path();
 
         /* Write CRTC */
diff --git a/drivers/video/via/hw.h b/drivers/video/via/hw.h
index 691fbd2d8067..12ef32d334cb 100644
--- a/drivers/video/via/hw.h
+++ b/drivers/video/via/hw.h
@@ -914,6 +914,8 @@ void viafb_set_primary_address(u32 addr);
 void viafb_set_secondary_address(u32 addr);
 void viafb_set_primary_pitch(u32 pitch);
 void viafb_set_secondary_pitch(u32 pitch);
+void viafb_set_primary_color_register(u8 index, u8 red, u8 green, u8 blue);
+void viafb_set_secondary_color_register(u8 index, u8 red, u8 green, u8 blue);
 void viafb_get_fb_info(unsigned int *fb_base, unsigned int *fb_len);
 
 #endif /* __HW_H__ */
diff --git a/drivers/video/via/viafbdev.c b/drivers/video/via/viafbdev.c
index 0fe748d66a6c..410de33f5778 100644
--- a/drivers/video/via/viafbdev.c
+++ b/drivers/video/via/viafbdev.c
@@ -76,9 +76,9 @@ static void viafb_fill_var_color_info(struct fb_var_screeninfo *var, u8 depth)
                 var->red.offset = 0;
                 var->green.offset = 0;
                 var->blue.offset = 0;
-                var->red.length = 6;
-                var->green.length = 6;
-                var->blue.length = 6;
+                var->red.length = 8;
+                var->green.length = 8;
+                var->blue.length = 8;
                 break;
         case 16:
                 var->bits_per_pixel = 16;
@@ -255,219 +255,33 @@ static int viafb_set_par(struct fb_info *info)
 static int viafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 unsigned blue, unsigned transp, struct fb_info *info)
 {
-        u8 sr1a, sr1b, cr67, cr6a, rev = 0, shift = 10;
-        unsigned cmap_entries = (info->var.bits_per_pixel == 8) ? 256 : 16;
-        DEBUG_MSG(KERN_INFO "viafb_setcolreg!\n");
-        if (regno >= cmap_entries)
-                return 1;
-        if (UNICHROME_CLE266 == viaparinfo->chip_info->gfx_chip_name) {
-                /*
-                 * Read PCI bus 0,dev 0,function 0,index 0xF6 to get chip rev.
-                 */
-                outl(0x80000000 | (0xf6 & ~3), (unsigned long)0xCF8);
-                rev = (inl((unsigned long)0xCFC) >> ((0xf6 & 3) * 8)) & 0xff;
-        }
-        switch (info->var.bits_per_pixel) {
-        case 8:
-                outb(0x1A, 0x3C4);
-                sr1a = inb(0x3C5);
-                outb(0x1B, 0x3C4);
-                sr1b = inb(0x3C5);
-                outb(0x67, 0x3D4);
-                cr67 = inb(0x3D5);
-                outb(0x6A, 0x3D4);
-                cr6a = inb(0x3D5);
-
-                /* Map the 3C6/7/8/9 to the IGA2 */
-                outb(0x1A, 0x3C4);
-                outb(sr1a | 0x01, 0x3C5);
-                /* Second Display Engine colck always on */
-                outb(0x1B, 0x3C4);
-                outb(sr1b | 0x80, 0x3C5);
-                /* Second Display Color Depth 8 */
-                outb(0x67, 0x3D4);
-                outb(cr67 & 0x3F, 0x3D5);
-                outb(0x6A, 0x3D4);
-                /* Second Display Channel Reset CR6A[6]) */
-                outb(cr6a & 0xBF, 0x3D5);
-                /* Second Display Channel Enable CR6A[7] */
-                outb(cr6a | 0x80, 0x3D5);
-                /* Second Display Channel stop reset) */
-                outb(cr6a | 0x40, 0x3D5);
-
-                /* Bit mask of palette */
-                outb(0xFF, 0x3c6);
-                /* Write one register of IGA2 */
-                outb(regno, 0x3C8);
-                if (UNICHROME_CLE266 == viaparinfo->chip_info->gfx_chip_name &&
-                        rev >= 15) {
-                        shift = 8;
-                        viafb_write_reg_mask(CR6A, VIACR, BIT5, BIT5);
-                        viafb_write_reg_mask(SR15, VIASR, BIT7, BIT7);
-                } else {
-                        shift = 10;
-                        viafb_write_reg_mask(CR6A, VIACR, 0, BIT5);
-                        viafb_write_reg_mask(SR15, VIASR, 0, BIT7);
-                }
-                outb(red >> shift, 0x3C9);
-                outb(green >> shift, 0x3C9);
-                outb(blue >> shift, 0x3C9);
-
-                /* Map the 3C6/7/8/9 to the IGA1 */
-                outb(0x1A, 0x3C4);
-                outb(sr1a & 0xFE, 0x3C5);
-                /* Bit mask of palette */
-                outb(0xFF, 0x3c6);
-                /* Write one register of IGA1 */
-                outb(regno, 0x3C8);
-                outb(red >> shift, 0x3C9);
-                outb(green >> shift, 0x3C9);
-                outb(blue >> shift, 0x3C9);
-
-                outb(0x1A, 0x3C4);
-                outb(sr1a, 0x3C5);
-                outb(0x1B, 0x3C4);
-                outb(sr1b, 0x3C5);
-                outb(0x67, 0x3D4);
-                outb(cr67, 0x3D5);
-                outb(0x6A, 0x3D4);
-                outb(cr6a, 0x3D5);
-                break;
-        case 16:
-                ((u32 *) info->pseudo_palette)[regno] = (red & 0xF800) |
-                    ((green & 0xFC00) >> 5) | ((blue & 0xF800) >> 11);
-                break;
-        case 32:
-                ((u32 *) info->pseudo_palette)[regno] =
-                    ((transp & 0xFF00) << 16) |
-                    ((red & 0xFF00) << 8) |
-                    ((green & 0xFF00)) | ((blue & 0xFF00) >> 8);
-                break;
-        }
-
-        return 0;
+        struct viafb_par *viapar = info->par;
+        u32 r, g, b;
 
-}
+        if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR) {
+                if (regno > 255)
+                        return -EINVAL;
 
-/*CALLED BY: fb_set_cmap */
-/*           fb_set_var, pass 256 colors */
-/*CALLED BY: fb_set_cmap */
-/*           fbcon_set_palette, pass 16 colors */
-static int viafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
-{
-        u32 len = cmap->len;
-        u32 i;
-        u16 *pred = cmap->red;
-        u16 *pgreen = cmap->green;
-        u16 *pblue = cmap->blue;
-        u16 *ptransp = cmap->transp;
-        u8 sr1a, sr1b, cr67, cr6a, rev = 0, shift = 10;
-        if (len > 256)
-                return 1;
-        if (UNICHROME_CLE266 == viaparinfo->chip_info->gfx_chip_name) {
-                /*
-                 * Read PCI bus 0, dev 0, function 0, index 0xF6 to get chip
-                 * rev.
-                 */
-                outl(0x80000000 | (0xf6 & ~3), (unsigned long)0xCF8);
-                rev = (inl((unsigned long)0xCFC) >> ((0xf6 & 3) * 8)) & 0xff;
-        }
-        switch (info->var.bits_per_pixel) {
-        case 8:
-                outb(0x1A, 0x3C4);
-                sr1a = inb(0x3C5);
-                outb(0x1B, 0x3C4);
-                sr1b = inb(0x3C5);
-                outb(0x67, 0x3D4);
-                cr67 = inb(0x3D5);
-                outb(0x6A, 0x3D4);
-                cr6a = inb(0x3D5);
-                /* Map the 3C6/7/8/9 to the IGA2 */
-                outb(0x1A, 0x3C4);
-                outb(sr1a | 0x01, 0x3C5);
-                outb(0x1B, 0x3C4);
-                /* Second Display Engine colck always on */
-                outb(sr1b | 0x80, 0x3C5);
-                outb(0x67, 0x3D4);
-                /* Second Display Color Depth 8 */
-                outb(cr67 & 0x3F, 0x3D5);
-                outb(0x6A, 0x3D4);
-                /* Second Display Channel Reset CR6A[6]) */
-                outb(cr6a & 0xBF, 0x3D5);
-                /* Second Display Channel Enable CR6A[7] */
-                outb(cr6a | 0x80, 0x3D5);
-                /* Second Display Channel stop reset) */
-                outb(cr6a | 0xC0, 0x3D5);
-
-                /* Bit mask of palette */
-                outb(0xFF, 0x3c6);
-                outb(0x00, 0x3C8);
-                if (UNICHROME_CLE266 == viaparinfo->chip_info->gfx_chip_name &&
-                        rev >= 15) {
-                        shift = 8;
-                        viafb_write_reg_mask(CR6A, VIACR, BIT5, BIT5);
-                        viafb_write_reg_mask(SR15, VIASR, BIT7, BIT7);
-                } else {
-                        shift = 10;
-                        viafb_write_reg_mask(CR6A, VIACR, 0, BIT5);
-                        viafb_write_reg_mask(SR15, VIASR, 0, BIT7);
-                }
-                for (i = 0; i < len; i++) {
-                        outb((*(pred + i)) >> shift, 0x3C9);
-                        outb((*(pgreen + i)) >> shift, 0x3C9);
-                        outb((*(pblue + i)) >> shift, 0x3C9);
-                }
+                if (!viafb_dual_fb || viapar->iga_path == IGA1)
+                        viafb_set_primary_color_register(regno, red >> 8,
+                                green >> 8, blue >> 8);
 
-                outb(0x1A, 0x3C4);
-                /* Map the 3C6/7/8/9 to the IGA1 */
-                outb(sr1a & 0xFE, 0x3C5);
-                /* Bit mask of palette */
-                outb(0xFF, 0x3c6);
-                outb(0x00, 0x3C8);
-                for (i = 0; i < len; i++) {
-                        outb((*(pred + i)) >> shift, 0x3C9);
-                        outb((*(pgreen + i)) >> shift, 0x3C9);
-                        outb((*(pblue + i)) >> shift, 0x3C9);
-                }
+                if (!viafb_dual_fb || viapar->iga_path == IGA2)
+                        viafb_set_secondary_color_register(regno, red >> 8,
+                                green >> 8, blue >> 8);
+        } else {
+                if (regno > 15)
+                        return -EINVAL;
 
-                outb(0x1A, 0x3C4);
-                outb(sr1a, 0x3C5);
-                outb(0x1B, 0x3C4);
-                outb(sr1b, 0x3C5);
-                outb(0x67, 0x3D4);
-                outb(cr67, 0x3D5);
-                outb(0x6A, 0x3D4);
-                outb(cr6a, 0x3D5);
-                break;
-        case 16:
-                if (len > 17)
-                        return 0;       /* Because static u32 pseudo_pal[17]; */
-                for (i = 0; i < len; i++)
-                        ((u32 *) info->pseudo_palette)[i] =
-                            (*(pred + i) & 0xF800) |
-                            ((*(pgreen + i) & 0xFC00) >> 5) |
-                            ((*(pblue + i) & 0xF800) >> 11);
-                break;
-        case 32:
-                if (len > 17)
-                        return 0;
-                if (ptransp) {
-                        for (i = 0; i < len; i++)
-                                ((u32 *) info->pseudo_palette)[i] =
-                                    ((*(ptransp + i) & 0xFF00) << 16) |
-                                    ((*(pred + i) & 0xFF00) << 8) |
-                                    ((*(pgreen + i) & 0xFF00)) |
-                                    ((*(pblue + i) & 0xFF00) >> 8);
-                } else {
-                        for (i = 0; i < len; i++)
-                                ((u32 *) info->pseudo_palette)[i] =
-                                    0x00000000 |
-                                    ((*(pred + i) & 0xFF00) << 8) |
-                                    ((*(pgreen + i) & 0xFF00)) |
-                                    ((*(pblue + i) & 0xFF00) >> 8);
-                }
-                break;
+                r = (red >> (16 - info->var.red.length))
+                        << info->var.red.offset;
+                b = (blue >> (16 - info->var.blue.length))
+                        << info->var.blue.offset;
+                g = (green >> (16 - info->var.green.length))
+                        << info->var.green.offset;
+                ((u32 *) info->pseudo_palette)[regno] = r | g | b;
         }
+
         return 0;
 }
 
@@ -2286,7 +2100,6 @@ static struct fb_ops viafb_ops = {
         .fb_cursor = viafb_cursor,
         .fb_ioctl = viafb_ioctl,
         .fb_sync = viafb_sync,
-        .fb_setcmap = viafb_setcmap,
 };
 
 module_init(viafb_init);