rk27xx: Use DMA for lcd_update_rect()

This speeds up partial updates quite a bit but what is more
important it opens up a way to efficiently implement
lcd_blit_yuv() using hw colorspace conversion.

Tested on rk27generic, hm60x v1 and v2 and on ma9.

Benchmark for hm60x v1 (by mortalis):
HEAD patched
1/1 141fps 138fps
1/4 315fps 395fps

Change-Id: I4cc115786c3139000fc14c49a7290e289cfd6c42

1 files changed, 0 insertions, 14 deletions

diff --git a/firmware/target/arm/rk27xx/ma/lcd-ma.c b/firmware/target/arm/rk27xx/ma/lcd-ma.c
index 3c3d9fb097..a35f13ba3a 100644
--- a/firmware/target/arm/rk27xx/ma/lcd-ma.c
+++ b/firmware/target/arm/rk27xx/ma/lcd-ma.c
@@ -172,20 +172,6 @@ void lcd_set_gram_area(int x_start, int y_start,
     LCDC_CTRL &= ~RGB24B;
 }
 
-void lcd_update_rect(int x, int y, int width, int height)
-{
-    int px = x, py = y;
-    int pxmax = x + width, pymax = y + height;
-
-    lcd_set_gram_area(x, y, pxmax-1, pymax-1);
-
-    for (py = y; py < pymax; py++)
-        for (px = x; px < pxmax; px++)
-            LCD_DATA = (*FBADDR(px, py));
-
-}
-
-
 bool lcd_active()
 {
     return display_on;