From 6a56c14e17f6ba113ec0d4d40e75bffd61b293cc Mon Sep 17 00:00:00 2001
From: Jens Arnold <amiconn@rockbox.org>
Date: Wed, 9 Jan 2008 23:48:26 +0000
Subject: Greyscale library: Changed the internal data format once more
 (separated pixel values and phases), allowing for further optimisation of
 drawing, scrolling etc. * Optimised grey phase blitting in the core reduces
 CPU load on all architectures, most significantly on coldfire. Previous
 version was too slow to keep up at 45MHz, leading to unwanted graininess
 (update frequency was halved). Also fixed screendump on 2bpp targets with
 vertical pixel packing.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16043 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/ipod/lcd-gray.c                | 134 ++++++---------
 firmware/target/coldfire/iaudio/m5/lcd-as-m5.S     | 189 +++++++++++++++------
 firmware/target/coldfire/iaudio/m5/lcd-m5.c        |  12 +-
 firmware/target/coldfire/iriver/h100/lcd-as-h100.S | 189 +++++++++++++++------
 firmware/target/coldfire/iriver/h100/lcd-h100.c    |  12 +-
 firmware/target/sh/archos/lcd-archos-bitmap.c      |  12 +-
 firmware/target/sh/archos/lcd-as-archos-bitmap.S   | 125 +++++++-------
 7 files changed, 412 insertions(+), 261 deletions(-)

(limited to 'firmware/target')

diff --git a/firmware/target/arm/ipod/lcd-gray.c b/firmware/target/arm/ipod/lcd-gray.c
index c7f4074c0b..5734480bee 100644
--- a/firmware/target/arm/ipod/lcd-gray.c
+++ b/firmware/target/arm/ipod/lcd-gray.c
@@ -301,118 +301,88 @@ void lcd_blit(const unsigned char* data, int bx, int y, int bwidth,
 
 /* Performance function that works with an external buffer
    note that bx and bwidth are in 8-pixel units! */
-void lcd_grey_phase_blit(const struct grey_data *data, int bx, int y, 
-                         int bwidth, int height, int stride)
+void lcd_grey_phase_blit(unsigned char *values, unsigned char *phases,
+                         int bx, int y, int bwidth, int height, int stride)
 {
-    const struct grey_data *addr;
-    int width;
-    
+    unsigned char *val, *ph;
+    int bw;
+
     while (height--) {
         lcd_cmd_and_data(R_RAM_ADDR_SET, (y++ << 5) + addr_offset - bx);
         lcd_prepare_cmd(R_RAM_DATA);
 
-        addr = data;
-        width = bwidth;
+        val = values;
+        ph = phases;
+        bw = bwidth;
         asm volatile (
         "10:                                 \n"
-            "ldmia   %[addr]!, {r0-r3}       \n" /* r0 = v1p1v0p0 ... */
+            "ldmia   %[ph], {r0-r1}          \n" /* Fetch 8 pixel phases */
+            "ldmia   %[val]!, {r2-r3}        \n" /* Fetch 8 pixel values */
 #ifdef IPOD_MINI2G
-            "mov     r5, #0x7600             \n"
+            "mov     r4, #0x7600             \n"
 #else
-            "mov     r5, #0                  \n"
+            "mov     r4, #0                  \n"
 #endif
-
-            "and     r4, r0, %[mask]         \n" /* r4 = --p1--p0 */
-            "and     r0, %[mask], r0, lsr #8 \n" /* r0 = --v1--v0 */
-            
-            "tst     r4, #0x80               \n"
-            "orreq   r5, r5, #0xc0           \n"
-            "tst     r4, #0x800000           \n"
-            "orreq   r5, r5, #0x30           \n"
-            "bic     r4, r4, %[clbt]         \n"
-            
-            "add     r4, r0, r4              \n" /* p0 += v0; p1 += v1; */
-            "strb    r4, [%[addr], #-16]     \n"
-            "mov     r4, r4, lsr #16         \n"
-            "strb    r4, [%[addr], #-14]     \n"
-
-            "and     r4, r1, %[mask]         \n"
-            "and     r1, %[mask], r1, lsr #8 \n"
-
-            "tst     r4, #0x80               \n"
-            "orreq   r5, r5, #0x0c           \n"
-            "tst     r4, #0x800000           \n"
-            "orreq   r5, r5, #0x03           \n"
-            "bic     r4, r4, %[clbt]         \n"
-            
-            "add     r4, r1, r4              \n"
-            "strb    r4, [%[addr], #-12]     \n"
-            "mov     r4, r4, lsr #16         \n"
-            "strb    r4, [%[addr], #-10]     \n"
+            "tst     r0, #0x80               \n"
+            "orreq   r4, r4, #0xc0           \n"
+            "tst     r0, #0x8000             \n"
+            "orreq   r4, r4, #0x30           \n"
+            "tst     r0, #0x800000           \n"
+            "orreq   r4, r4, #0x0c           \n"
+            "tst     r0, #0x80000000         \n"
+            "orreq   r4, r4, #0x03           \n"
+            "bic     r0, r0, %[clbt]         \n"
+            "add     r0, r0, r2              \n"
 
 #ifdef IPOD_MINI2G
-            "mov     r5, r5, lsl #8          \n"
+            "mov     r4, r4, lsl #8          \n"
 #else
         "1:                                  \n"
-            "ldr     r4, [%[lcdb]]           \n"
-            "tst     r4, #0x8000             \n"
+            "ldr     r2, [%[lcdb]]           \n"
+            "tst     r2, #0x8000             \n"
             "bne     1b                      \n"
 
-            "str     r5, [%[lcdb], #0x10]    \n"
-            "mov     r5, #0                  \n"
+            "str     r4, [%[lcdb], #0x10]    \n"
+            "mov     r4, #0                  \n"
 #endif
 
-            "and     r4, r2, %[mask]         \n"
-            "and     r2, %[mask], r2, lsr #8 \n"
-
-            "tst     r4, #0x80               \n"
-            "orreq   r5, r5, #0xc0           \n"
-            "tst     r4, #0x800000           \n"
-            "orreq   r5, r5, #0x30           \n"
-            "bic     r4, r4, %[clbt]         \n"
-            
-            "add     r4, r2, r4              \n"
-            "strb    r4, [%[addr], #-8]      \n"
-            "mov     r4, r4, lsr #16         \n"
-            "strb    r4, [%[addr], #-6]      \n"
-
-            "and     r4, r3, %[mask]         \n"
-            "and     r3, %[mask], r3, lsr #8 \n"
-
-            "tst     r4, #0x80               \n"
-            "orreq   r5, r5, #0x0c           \n"
-            "tst     r4, #0x800000           \n"
-            "orreq   r5, r5, #0x03           \n"
-            "bic     r4, r4, %[clbt]         \n"
-            
-            "add     r4, r3, r4              \n"
-            "strb    r4, [%[addr], #-4]      \n"
-            "mov     r4, r4, lsr #16         \n"
-            "strb    r4, [%[addr], #-2]      \n"
-            
+            "tst     r1, #0x80               \n"
+            "orreq   r4, r4, #0xc0           \n"
+            "tst     r1, #0x8000             \n"
+            "orreq   r4, r4, #0x30           \n"
+            "tst     r1, #0x800000           \n"
+            "orreq   r4, r4, #0x0c           \n"
+            "tst     r1, #0x80000000         \n"
+            "orreq   r4, r4, #0x03           \n"
+            "bic     r1, r1, %[clbt]         \n"
+            "add     r1, r1, r3              \n"
+
+            "stmia   %[ph]!, {r0-r1}         \n"
+
         "1:                                  \n"
-            "ldr     r4, [%[lcdb]]           \n"
-            "tst     r4, #0x8000             \n"
+            "ldr     r2, [%[lcdb]]           \n"
+            "tst     r2, #0x8000             \n"
             "bne     1b                      \n"
 #ifdef IPOD_MINI2G
-            "str     r5, [%[lcdb], #0x08]    \n"
+            "str     r4, [%[lcdb], #0x08]    \n"
 #else
-            "str     r5, [%[lcdb], #0x10]    \n"
+            "str     r4, [%[lcdb], #0x10]    \n"
 #endif
 
-            "subs    %[wdth], %[wdth], #1    \n"
+            "subs    %[bw], %[bw], #1        \n"
             "bne     10b                     \n"
             : /* outputs */
-            [addr]"+r"(addr),
-            [wdth]"+r"(width)
+            [val]"+r"(val),
+            [ph] "+r"(ph),
+            [bw] "+r"(bw)
             : /* inputs */
-            [mask]"r"(0x00ff00ff),
-            [clbt]"r"(0x00800080),
+            [clbt]"r"(0x80808080),
             [lcdb]"r"(LCD1_BASE)
             : /* clobbers */
-            "r0", "r1", "r2", "r3", "r4", "r5"
+            "r0", "r1", "r2", "r3", "r4"
         );
-        data += stride;
+        values += stride;
+        phases += stride;
     }
 }
 
diff --git a/firmware/target/coldfire/iaudio/m5/lcd-as-m5.S b/firmware/target/coldfire/iaudio/m5/lcd-as-m5.S
index 7e89815ec8..0ec98e4589 100644
--- a/firmware/target/coldfire/iaudio/m5/lcd-as-m5.S
+++ b/firmware/target/coldfire/iaudio/m5/lcd-as-m5.S
@@ -88,57 +88,146 @@ lcd_write_data:
     .type       lcd_grey_data,@function
 
 lcd_grey_data:
-    lea.l   (-4*4, %sp), %sp
-    movem.l %d2-%d5, (%sp)
-    movem.l (4*4+4, %sp), %a0-%a1 /* Data pointer */
-    move.l  %a1, %d0            /* Length */
-    lea     0xf0008002, %a1     /* LCD data port */
-    move.l  #0xff00ff00, %d2    /* mask for splitting value/phase pairs */
-
-.greyloop:
-    movem.l (%a0), %d4-%d5      /* fetch 4 pixel phase/value pairs at once */
-                                /* %d4 = p0v0p1v1, %d5 = p2v2p3v3 */
-    move.l  %d2, %d3            /* copy mask */
-    and.l   %d4, %d3            /* %d3 = p0--p1-- */
-    eor.l   %d3, %d4            /* %d4 = --v0--v1 */
-    lsr.l   #8, %d3             /* %d3 = --p0--p1 */
-
-    bclr.l  #23, %d3            /* Z = !(p0 & 0x80); p0 &= ~0x80; */
-    seq.b   %d1                 /* %d1 = ........................00000000 */
-    lsl.l   #2, %d1             /* %d1 = ......................00000000.. */
-    bclr.l  #7, %d3             /* Z = !(p1 & 0x80); p1 &= ~0x80; */
-    seq.b   %d1                 /* %d1 = ......................0011111111 */
-    lsl.l   #2, %d1             /* %d1 = ....................0011111111.. */
+    lea.l   (-9*4, %sp), %sp
+    movem.l %d2-%d5/%a2-%a6, (%sp)  /* free some registers */
+    movem.l (9*4+4, %sp), %a0-%a2   /* values, phases, length */
+    lea.l   (%a1, %a2.l*4), %a2     /* end address */
+    lea     0xf0008002, %a3     /* LCD data port */
+
+    moveq.l #15, %d3
+    add.l   %a1, %d3
+    and.l   #0xfffffff0, %d3    /* first line bound */
+    move.l  %a2, %d1
+    and.l   #0xfffffff0, %d1    /* last line bound */
+    cmp.l   %d3, %d1
+    bls.w   .g_tloop            /* no lines to copy - jump to tail loop */
+    cmp.l   %a1, %d0
+    bls.s   .g_lloop            /* no head blocks - jump to line loop */
+
+.g_hloop:
+    move.l  (%a1), %d2          /* fetch 4 pixel phases */
+
+    bclr.l  #31, %d2            /* Z = !(p0 & 0x80); p0 &= ~0x80; */
+    seq.b   %d0                 /* %d0 = ........................00000000 */
+    lsl.l   #2, %d0             /* %d0 = ......................00000000.. */
+    bclr.l  #23, %d2            /* Z = !(p1 & 0x80); p1 &= ~0x80; */
+    seq.b   %d0                 /* %d0 = ......................0011111111 */
+    lsl.l   #2, %d0             /* %d0 = ....................0011111111.. */
+    bclr.l  #15, %d2            /* Z = !(p2 & 0x80); p2 &= ~0x80; */
+    seq.b   %d0                 /* %d0 = ....................001122222222 */
+    lsl.l   #2, %d0             /* %d0 = ..................001122222222.. */
+    bclr.l  #7, %d2             /* Z = !(p3 & 0x80); p3 &= ~0x80; */
+    seq.b   %d0                 /* %d0 = ..................00112233333333 */
+    lsr.l   #6, %d0             /* %d0 = ........................00112233 */
+    move.w  %d0, (%a3)          /* write pixel block */
+    
+    add.l   (%a0)+, %d2         /* add 4 pixel values to the phases */
+    move.l  %d2, (%a1)+         /* store new phases, advance pointer */
+
+    cmp.l   %a1, %d3            /* go up to first line bound */
+    bhi.s   .g_hloop
+    
+.g_lloop:
+    movem.l (%a1), %d2-%d5
+    
+    bclr.l  #31, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #23, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #15, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #7, %d2
+    seq.b   %d0
+    lsr.l   #6, %d0
+    move.w  %d0, (%a3)
+
+    bclr.l  #31, %d3
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #23, %d3
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #15, %d3
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #7, %d3
+    seq.b   %d0
+    lsr.l   #6, %d0
+    move.w  %d0, (%a3)
     
-    add.l   %d4, %d3            /* p0 += v0; p1 += v1; */
-    move.b  %d3, (2, %a0)       /* store p1 */
-    swap    %d3
-    move.b  %d3, (%a0)          /* store p0 */
-
-    move.l  %d2, %d3            /* copy mask */
-    and.l   %d5, %d3            /* %d3 = p2--p3-- */
-    eor.l   %d3, %d5            /* %d5 = --v2--v3 */
-    lsr.l   #8, %d3             /* %d3 = --p2--p3 */
-
-    bclr.l  #23, %d3            /* Z = !(p2 & 0x80); p2 &= ~0x80; */
-    seq.b   %d1                 /* %d1 = ....................001122222222 */
-    lsl.l   #2, %d1             /* %d1 = ..................001122222222.. */
-    bclr.l  #7, %d3             /* Z = !(p3 & 0x80); p3 &= ~0x80; */
-    seq.b   %d1                 /* %d1 = ..................00112233333333 */
-    lsr.l   #6, %d1             /* %d1 = ........................00112233 */
-
-    add.l   %d5, %d3            /* p2 += v2; p3 += v3; */
-    move.b  %d3, (6, %a0)       /* store p3 */
-    swap    %d3
-    move.b  %d3, (4, %a0)       /* store p2 */
-
-    move.w  %d1, (%a1)          /* write pixel block */
-    addq.l  #8, %a0             /* advance address pointer */
-    subq.l  #1, %d0             /* any blocks left? */
-    bne.b   .greyloop
-
-    movem.l (%sp), %d2-%d5
-    lea.l   (4*4, %sp), %sp
+    bclr.l  #31, %d4
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #23, %d4
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #15, %d4
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #7, %d4
+    seq.b   %d0
+    lsr.l   #6, %d0
+    move.w  %d0, (%a3)
+    
+    bclr.l  #31, %d5
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #23, %d5
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #15, %d5
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #7, %d5
+    seq.b   %d0
+    lsr.l   #6, %d0
+    move.w  %d0, (%a3)
+    
+    movem.l (%a0), %d0/%a4-%a6
+    lea.l   (16, %a0), %a0
+    add.l   %d0, %d2
+    add.l   %a4, %d3
+    add.l   %a5, %d4
+    add.l   %a6, %d5
+    movem.l %d2-%d5, (%a1)
+    lea.l   (16, %a1), %a1
+
+    cmp.l   %a1, %d1            /* go up to last line bound */
+    bhi.w   .g_lloop
+    
+    cmp.l   %a1, %a2
+    bls.s   .g_no_tail
+
+.g_tloop:
+    move.l  (%a1), %d2
+
+    bclr.l  #31, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #23, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #15, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #7, %d2
+    seq.b   %d0
+    lsr.l   #6, %d0
+    move.w  %d0, (%a3)
+
+    add.l   (%a0)+, %d2         /* go up to end address */
+    move.l  %d2, (%a1)+
+
+    cmp.l   %a1, %a2
+    bhi.s   .g_tloop
+
+.g_no_tail:
+    movem.l (%sp), %d2-%d5/%a2-%a6  /* restore registers */
+    lea.l   (9*4, %sp), %sp
     rts
+
 .gd_end:
     .size   lcd_grey_data,.gd_end-lcd_grey_data
diff --git a/firmware/target/coldfire/iaudio/m5/lcd-m5.c b/firmware/target/coldfire/iaudio/m5/lcd-m5.c
index 4f963795c7..be9d5a39b8 100644
--- a/firmware/target/coldfire/iaudio/m5/lcd-m5.c
+++ b/firmware/target/coldfire/iaudio/m5/lcd-m5.c
@@ -171,10 +171,13 @@ void lcd_blit(const unsigned char* data, int x, int by, int width,
     }
 }
 
+/* Helper function for lcd_grey_phase_blit(). */
+void lcd_grey_data(unsigned char *values, unsigned char *phases, int count);
+
 /* Performance function that works with an external buffer
    note that by and bheight are in 4-pixel units! */
-void lcd_grey_phase_blit(const struct grey_data *data, int x, int by, 
-                         int width, int bheight, int stride)
+void lcd_grey_phase_blit(unsigned char *values, unsigned char *phases,
+                         int x, int by, int width, int bheight, int stride)
 {
     stride <<= 2; /* 4 pixels per block */
     while (bheight--)
@@ -182,8 +185,9 @@ void lcd_grey_phase_blit(const struct grey_data *data, int x, int by,
         lcd_write_command_ex(LCD_CNTL_PAGE, by++, -1);
         lcd_write_command_ex(LCD_CNTL_COLUMN, x, -1);
         lcd_write_command(LCD_CNTL_DATA_WRITE);
-        lcd_grey_data(data, width);
-        data += stride;
+        lcd_grey_data(values, phases, width);
+        values += stride;
+        phases += stride;
     }
 }
 
diff --git a/firmware/target/coldfire/iriver/h100/lcd-as-h100.S b/firmware/target/coldfire/iriver/h100/lcd-as-h100.S
index df410fa379..776e22a6c4 100644
--- a/firmware/target/coldfire/iriver/h100/lcd-as-h100.S
+++ b/firmware/target/coldfire/iriver/h100/lcd-as-h100.S
@@ -100,59 +100,148 @@ lcd_write_data:
     .type       lcd_grey_data,@function
 
 lcd_grey_data:
-    lea.l   (-4*4, %sp), %sp
-    movem.l %d2-%d5, (%sp)
-    movem.l (4*4+4, %sp), %a0-%a1 /* Data pointer */
-    move.l  %a1, %d0            /* Length */
+    lea.l   (-9*4, %sp), %sp
+    movem.l %d2-%d5/%a2-%a6, (%sp)  /* free some registers */
+    movem.l (9*4+4, %sp), %a0-%a2   /* values, phases, length */
+    lea.l   (%a1, %a2.l*4), %a2     /* end address */
     moveq   #8, %d1
     or.l    %d1, (MBAR2+0xb4)   /* A0 = 1 (data) */
-    lea     0xf0000000, %a1     /* LCD data port */
-    move.l  #0xff00ff00, %d2    /* mask for splitting value/phase pairs */
-
-.greyloop:
-    movem.l (%a0), %d4-%d5      /* fetch 4 pixel phase/value pairs at once */
-                                /* %d4 = p0v0p1v1, %d5 = p2v2p3v3 */
-    move.l  %d2, %d3            /* copy mask */
-    and.l   %d4, %d3            /* %d3 = p0--p1-- */
-    eor.l   %d3, %d4            /* %d4 = --v0--v1 */
-    lsr.l   #8, %d3             /* %d3 = --p0--p1 */
-
-    bclr.l  #23, %d3            /* Z = !(p0 & 0x80); p0 &= ~0x80; */
-    seq.b   %d1                 /* %d1 = ........................00000000 */
-    lsl.l   #2, %d1             /* %d1 = ......................00000000.. */
-    bclr.l  #7, %d3             /* Z = !(p1 & 0x80); p1 &= ~0x80; */
-    seq.b   %d1                 /* %d1 = ......................0011111111 */
-    lsl.l   #2, %d1             /* %d1 = ....................0011111111.. */
+    lea     0xf0000000, %a3     /* LCD data port */
+    
+    moveq.l #15, %d3
+    add.l   %a1, %d3
+    and.l   #0xfffffff0, %d3    /* first line bound */
+    move.l  %a2, %d1
+    and.l   #0xfffffff0, %d1    /* last line bound */
+    cmp.l   %d3, %d1
+    bls.w   .g_tloop            /* no lines to copy - jump to tail loop */
+    cmp.l   %a1, %d0
+    bls.s   .g_lloop            /* no head blocks - jump to line loop */
+
+.g_hloop:
+    move.l  (%a1), %d2          /* fetch 4 pixel phases */
+
+    bclr.l  #31, %d2            /* Z = !(p0 & 0x80); p0 &= ~0x80; */
+    seq.b   %d0                 /* %d0 = ........................00000000 */
+    lsl.l   #2, %d0             /* %d0 = ......................00000000.. */
+    bclr.l  #23, %d2            /* Z = !(p1 & 0x80); p1 &= ~0x80; */
+    seq.b   %d0                 /* %d0 = ......................0011111111 */
+    lsl.l   #2, %d0             /* %d0 = ....................0011111111.. */
+    bclr.l  #15, %d2            /* Z = !(p2 & 0x80); p2 &= ~0x80; */
+    seq.b   %d0                 /* %d0 = ....................001122222222 */
+    lsl.l   #2, %d0             /* %d0 = ..................001122222222.. */
+    bclr.l  #7, %d2             /* Z = !(p3 & 0x80); p3 &= ~0x80; */
+    seq.b   %d0                 /* %d0 = ..................00112233333333 */
+    lsr.l   #6, %d0             /* %d0 = ........................00112233 */
+    move.w  %d0, (%a3)          /* write pixel block */
+    
+    add.l   (%a0)+, %d2         /* add 4 pixel values to the phases */
+    move.l  %d2, (%a1)+         /* store new phases, advance pointer */
+
+    cmp.l   %a1, %d3            /* go up to first line bound */
+    bhi.s   .g_hloop
+    
+.g_lloop:
+    movem.l (%a1), %d2-%d5
     
-    add.l   %d4, %d3            /* p0 += v0; p1 += v1; */
-    move.b  %d3, (2, %a0)       /* store p1 */
-    swap    %d3
-    move.b  %d3, (%a0)          /* store p0 */
-
-    move.l  %d2, %d3            /* copy mask */
-    and.l   %d5, %d3            /* %d3 = p2--p3-- */
-    eor.l   %d3, %d5            /* %d5 = --v2--v3 */
-    lsr.l   #8, %d3             /* %d3 = --p2--p3 */
-
-    bclr.l  #23, %d3            /* Z = !(p2 & 0x80); p2 &= ~0x80; */
-    seq.b   %d1                 /* %d1 = ....................001122222222 */
-    lsl.l   #2, %d1             /* %d1 = ..................001122222222.. */
-    bclr.l  #7, %d3             /* Z = !(p3 & 0x80); p3 &= ~0x80; */
-    seq.b   %d1                 /* %d1 = ..................00112233333333 */
-    lsr.l   #6, %d1             /* %d1 = ........................00112233 */
-
-    add.l   %d5, %d3            /* p2 += v2; p3 += v3; */
-    move.b  %d3, (6, %a0)       /* store p3 */
-    swap    %d3
-    move.b  %d3, (4, %a0)       /* store p2 */
-
-    move.w  %d1, (%a1)          /* write pixel block */
-    addq.l  #8, %a0             /* advance address pointer */
-    subq.l  #1, %d0             /* any blocks left? */
-    bne.b   .greyloop
-
-    movem.l (%sp), %d2-%d5
-    lea.l   (4*4, %sp), %sp
+    bclr.l  #31, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #23, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #15, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #7, %d2
+    seq.b   %d0
+    lsr.l   #6, %d0
+    move.w  %d0, (%a3)
+
+    bclr.l  #31, %d3
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #23, %d3
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #15, %d3
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #7, %d3
+    seq.b   %d0
+    lsr.l   #6, %d0
+    move.w  %d0, (%a3)
+    
+    bclr.l  #31, %d4
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #23, %d4
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #15, %d4
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #7, %d4
+    seq.b   %d0
+    lsr.l   #6, %d0
+    move.w  %d0, (%a3)
+    
+    bclr.l  #31, %d5
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #23, %d5
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #15, %d5
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #7, %d5
+    seq.b   %d0
+    lsr.l   #6, %d0
+    move.w  %d0, (%a3)
+    
+    movem.l (%a0), %d0/%a4-%a6
+    lea.l   (16, %a0), %a0
+    add.l   %d0, %d2
+    add.l   %a4, %d3
+    add.l   %a5, %d4
+    add.l   %a6, %d5
+    movem.l %d2-%d5, (%a1)
+    lea.l   (16, %a1), %a1
+
+    cmp.l   %a1, %d1            /* go up to last line bound */
+    bhi.w   .g_lloop
+    
+    cmp.l   %a1, %a2
+    bls.s   .g_no_tail
+
+.g_tloop:
+    move.l  (%a1), %d2
+
+    bclr.l  #31, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #23, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #15, %d2
+    seq.b   %d0
+    lsl.l   #2, %d0
+    bclr.l  #7, %d2
+    seq.b   %d0
+    lsr.l   #6, %d0
+    move.w  %d0, (%a3)
+
+    add.l   (%a0)+, %d2
+    move.l  %d2, (%a1)+
+
+    cmp.l   %a1, %a2            /* go up to end address */
+    bhi.s   .g_tloop
+
+.g_no_tail:
+    movem.l (%sp), %d2-%d5/%a2-%a6  /* restore registers */
+    lea.l   (9*4, %sp), %sp
     rts
+
 .gd_end:
     .size   lcd_grey_data,.gd_end-lcd_grey_data
diff --git a/firmware/target/coldfire/iriver/h100/lcd-h100.c b/firmware/target/coldfire/iriver/h100/lcd-h100.c
index c17de952c3..2ba19255da 100644
--- a/firmware/target/coldfire/iriver/h100/lcd-h100.c
+++ b/firmware/target/coldfire/iriver/h100/lcd-h100.c
@@ -180,10 +180,13 @@ void lcd_blit(const unsigned char* data, int x, int by, int width,
     }
 }
 
+/* Helper function for lcd_grey_phase_blit(). */
+void lcd_grey_data(unsigned char *values, unsigned char *phases, int count);
+
 /* Performance function that works with an external buffer
    note that by and bheight are in 4-pixel units! */
-void lcd_grey_phase_blit(const struct grey_data *data, int x, int by, 
-                         int width, int bheight, int stride)
+void lcd_grey_phase_blit(unsigned char *values, unsigned char *phases,
+                         int x, int by, int width, int bheight, int stride)
 {
     stride <<= 2; /* 4 pixels per block */
     while (bheight--)
@@ -191,8 +194,9 @@ void lcd_grey_phase_blit(const struct grey_data *data, int x, int by,
         lcd_write_command_ex(LCD_CNTL_PAGE, by++, -1);
         lcd_write_command_ex(LCD_CNTL_COLUMN, x, -1);
         lcd_write_command(LCD_CNTL_DATA_WRITE);
-        lcd_grey_data(data, width);
-        data += stride;
+        lcd_grey_data(values, phases, width);
+        values += stride;
+        phases += stride;
     }
 }
 
diff --git a/firmware/target/sh/archos/lcd-archos-bitmap.c b/firmware/target/sh/archos/lcd-archos-bitmap.c
index 17c4d76092..18d48f4ead 100644
--- a/firmware/target/sh/archos/lcd-archos-bitmap.c
+++ b/firmware/target/sh/archos/lcd-archos-bitmap.c
@@ -155,10 +155,13 @@ void lcd_blit(const unsigned char* data, int x, int by, int width,
     }
 }
 
+/* Helper function for lcd_grey_phase_blit(). */
+void lcd_grey_data(unsigned char *values, unsigned char *phases, int count);
+
 /* Performance function that works with an external buffer
    note that by and bheight are in 8-pixel units! */
-void lcd_grey_phase_blit(const struct grey_data *data, int x, int by,
-                         int width, int bheight, int stride)
+void lcd_grey_phase_blit(unsigned char *values, unsigned char *phases,
+                         int x, int by, int width, int bheight, int stride)
 {
     stride <<= 3; /* 8 pixels per block */
     while (bheight--)
@@ -167,8 +170,9 @@ void lcd_grey_phase_blit(const struct grey_data *data, int x, int by,
         lcd_write_command (LCD_CNTL_HIGHCOL | (((x+xoffset)>>4) & 0xf));
         lcd_write_command (LCD_CNTL_LOWCOL | ((x+xoffset) & 0xf));
 
-        lcd_grey_data(data, width);
-        data += stride;
+        lcd_grey_data(values, phases, width);
+        values += stride;
+        phases += stride;
     }
 }
 
diff --git a/firmware/target/sh/archos/lcd-as-archos-bitmap.S b/firmware/target/sh/archos/lcd-as-archos-bitmap.S
index 492413fdb7..a60ea9aad1 100644
--- a/firmware/target/sh/archos/lcd-as-archos-bitmap.S
+++ b/firmware/target/sh/archos/lcd-as-archos-bitmap.S
@@ -210,28 +210,35 @@ _lcd_write_data:
  * one or multiple pixels.
  *
  * Arguments:
- *   r4 - data address, (phase,value)-pairs
- *   r5 - pixel block count
+ *   r4 - pixel value data address
+ *   r5 - pixel phase data address
+ *   r6 - pixel block count
  *
  * Register usage:
- *   r0 - current pixel value
+ *   r0 - scratch / phase signs mask
  *   r1 - scratch
  *   r2 - precalculated port value (CS and SC low, DS and SD high),
  *        negated (neg)!
  *   r3 - lcd port address
- *   r5 - end address
- *   r6/r7 - current/next pixel phase
- *   r8 - current block address (for writing back phase)
- *   r9 - 0x80 (for phase modification)
+ *   r4 - current value address
+ *   r5 - current phase address
+ *   r6 - end address
+ *   r7/r8 - current/next pixel phase
+ *   r9 - current pixel value
+ *   r10  - 0x00000080 \
+ *   r11 - 0x00008000  > for phase sign check
+ *   r12 - 0x00800000 /
  */
 
 _lcd_grey_data:
     mov.l   r8, @-r15       /* save r8 */
-    shll2   r5              /*    v */
+    shll2   r6              /*    v */
     mov.l   r9, @-r15       /* save r9 */
-    shll2   r5              /* r5 *= 16; (8 pixel per block * 2 bytes/pixel) */
+    shll    r6              /* r6 *= 8; (8 pixels per block) */
+    mov.l   r10, @-r15      /* save r10 */
+    add     r4, r6          /* end address */
     mov.l   .lcdr, r3       /* put lcd data port address in r3 */
-    add     r4, r5          /* end address */
+    nop                     /* keep alignment */
 
     /* This code will fail if an interrupt changes the contents of PBDRL.
      * If so, we must disable the interrupt here. If disabling interrupts
@@ -240,110 +247,90 @@ _lcd_grey_data:
      * this would significantly decrease performance. */
 
     mov.b   @r3, r0         /* r0 = PBDRL */
-    mov     #0x80, r9       /* for phase modification - "or #imm,xx" only allows r0 */
-    mov.b   @r4+, r6        /* fetch first pixel phase */
     or      #(LCD_DS|LCD_SD), r0    /* r0 |= LCD_DS|LCD_SD */
+    mov.l   r11, @-r15      /* save r11 */
     and     #(~(LCD_CS|LCD_SC)), r0 /* r0 &= ~(LCD_CS|LCD_SC) */
+    mov.l   r12, @-r15      /* save r12 */
     neg     r0, r2          /* r2 = 0 - r0 */
-    mov     #-3, r0         /* offset for storing phase */
 
     /* loop exploits that SD is on bit 0 for recorders and Ondios */
 
-.greyloop:
-    cmp/pz  r6              /* phase non-negative? */
-    mov.b   @r4+, r8        /* fetch pixel value */
-    negc    r2, r1          /* T -> SD, SC low */
-    mov.b   r1, @r3         /* set port */
-    or      r9, r6          /* r6 -= (r6 >= 0) ? 128 : 0; */
-    mov.b   @r4+, r7        /* fetch next pixel phase */
-    add     #(LCD_SC), r1   /* rise SC */
-    mov.b   r1, @r3         /* set port */
-    add     r8, r6          /* calculate new phase */
-    mov.b   r6, @(r0,r4)    /* store phase */
+    mov.w   .ptest, r10
+    swap.b  r10, r11
+    mov.l   @r5, r7
+    swap.w  r10, r12
+    mov.l   .pmask, r0
 
+.greyloop:
     cmp/pz  r7
-    mov.b   @r4+, r8
+    mov.l   @r4+, r9
     negc    r2, r1
     mov.b   r1, @r3
-    or      r9, r7
-    mov.b   @r4+, r6
     add     #(LCD_SC), r1
     mov.b   r1, @r3
-    add     r8, r7
-    mov.b   r7, @(r0,r4)
 
-    cmp/pz  r6
-    mov.b   @r4+, r8
+    tst     r12, r7
+    mov.l   @(4,r5), r8
     negc    r2, r1
     mov.b   r1, @r3
-    or      r9, r6
-    mov.b   @r4+, r7
     add     #(LCD_SC), r1
     mov.b   r1, @r3
-    add     r8, r6
-    mov.b   r6, @(r0,r4)
 
-    cmp/pz  r7
-    mov.b   @r4+, r8
+    tst     r11, r7
     negc    r2, r1
+    tst     r10, r7
     mov.b   r1, @r3
-    or      r9, r7
-    mov.b   @r4+, r6
     add     #(LCD_SC), r1
     mov.b   r1, @r3
-    add     r8, r7
-    mov.b   r7, @(r0,r4)
 
-    cmp/pz  r6
-    mov.b   @r4+, r8
+    or      r0, r7
+    sub     r9, r7
     negc    r2, r1
     mov.b   r1, @r3
-    or      r9, r6
-    mov.b   @r4+, r7
     add     #(LCD_SC), r1
     mov.b   r1, @r3
-    add     r8, r6
-    mov.b   r6, @(r0,r4)
 
-    cmp/pz  r7
-    mov.b   @r4+, r8
+    cmp/pz  r8
+    mov.l   r7, @r5
     negc    r2, r1
     mov.b   r1, @r3
-    or      r9, r7
-    mov.b   @r4+, r6
     add     #(LCD_SC), r1
     mov.b   r1, @r3
-    add     r8, r7
-    mov.b   r7, @(r0,r4)
 
-    cmp/pz  r6
-    mov.b   @r4+, r8
+    tst     r12, r8
+    mov.l   @r4+, r9
     negc    r2, r1
     mov.b   r1, @r3
-    or      r9, r6
-    mov.b   @r4+, r7
     add     #(LCD_SC), r1
     mov.b   r1, @r3
-    add     r8, r6
-    mov.b   r6, @(r0,r4)
 
-    cmp/pz  r7
-    mov.b   @r4+, r8
+    tst     r11, r8
+    mov.l   @(8,r5), r7
     negc    r2, r1
     mov.b   r1, @r3
-    or      r9, r7
-    mov.b   @r4+, r6
     add     #(LCD_SC), r1
     mov.b   r1, @r3
-    add     r8, r7
-    mov.b   r7, @(r0,r4)
 
-    cmp/hi  r4, r5          /* some blocks left? */
+    tst     r10, r8
+    or      r0, r8
+    negc    r2, r1
+    mov.b   r1, @r3
+    add     #(LCD_SC), r1
+    mov.b   r1, @r3
+
+    sub     r9, r8
+    mov.l   r8, @(4,r5)
+    
+    add     #8, r5
+    cmp/hi  r4, r6
     bt      .greyloop
 
+    mov.l   @r15+, r12      /* restore r12 */
     mov     #(LCD_CS|LCD_DS|LCD_SD|LCD_SC), r0
-    mov.l   @r15+, r9       /* restore r9 */
+    mov.l   @r15+, r11      /* restore r11 */
     or      r0, r1          /* restore port */
+    mov.l   @r15+, r10      /* restore r10 */
+    mov.l   @r15+, r9       /* restore r9 */
     mov.l   @r15+, r8       /* restore r8 */
     rts
     mov.b   r1, @r3
@@ -351,7 +338,11 @@ _lcd_grey_data:
     /* This is the place to reenable the interrupts, if we have disabled
      * them. See above. */
 
+.ptest:
+    .short  0x0080
 
     .align  2
 .lcdr:
     .long   LCDR
+.pmask:
+    .long   0x80808080
-- 
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