Samsung YH920 : fix lcd_blit_mono displaying twice too wide

lcd_write_data() wrote twice too much pixels to the controller
The fix is the same than r22885, vertically packed 2bpp displays use
8-bits fb_data while horizontally packed 2bpp use 16-bits fb_data

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22893 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 15 insertions, 11 deletions

diff --git a/firmware/target/arm/samsung/yh920/lcd-as-yh920.S b/firmware/target/arm/samsung/yh920/lcd-as-yh920.S
index 9444954041..2c7f5110bf 100644
--- a/firmware/target/arm/samsung/yh920/lcd-as-yh920.S
+++ b/firmware/target/arm/samsung/yh920/lcd-as-yh920.S
@@ -27,27 +27,31 @@
     .align      2
 
 
+/* Writes an array of pixels of specified width (in 8 bits unit)
+ *
+ * Arguments:
+ *  r0 : pixels array
+ *  r1 : number of pixels in 8 bits unit
+ *
+ * Register usage:
+ *  r2 : LCD_CONTROL value / pixel value
+ *  r3 : lcd bridge address
+ */
+
     .global     lcd_write_data
     .type       lcd_write_data,%function
 
 lcd_write_data:
-    ldr     r12, =LCD1_BASE
+    ldr     r3, =LCD1_BASE
 
 .loop:
-    ldrb    r2, [r0], #1
-
 1:
-    ldr     r3, [r12]
-    tst     r3, #LCD1_BUSY_MASK
+    ldr     r2, [r3]
+    tst     r2, #LCD1_BUSY_MASK
     bne     1b
-    str     r2, [r12, #0x10]
 
     ldrb    r2, [r0], #1
-1:
-    ldr     r3, [r12]
-    tst     r3, #LCD1_BUSY_MASK
-    bne     1b
-    str     r2, [r12, #0x10]
+    str     r2, [r3, #0x10]
 
     subs    r1, r1, #1
     bne     .loop