rk27xx lcd code rework

Use DMA engine for fullscreen updates and bypass mode for partial
updates. This gives major boost on rk27generic:
default ARM:AHB:APB 200:100:50
HEAD    1/1:  26.3fps 1/4: 105.0fps
patched 1/1: 116.5fps 1/4: 249.5fps

with freq scalling NORMAL mode ARM:AHB:APB 50:50:50
HEAD    1/1:  13.1fps 1/4: 52.5fps
patched 1/1:  54.5fps 1/4: 119.0fps

Tested on rk27generic noname DAP and on Hifimans.

Change-Id: Id9dd4d2d61542c7ea6b5c6336b170d6357cefde9

1 files changed, 4 insertions, 3 deletions

diff --git a/firmware/target/arm/rk27xx/lcdif-rk27xx.h b/firmware/target/arm/rk27xx/lcdif-rk27xx.h
index 1d7b810fa2..ea2dbea255 100644
--- a/firmware/target/arm/rk27xx/lcdif-rk27xx.h
+++ b/firmware/target/arm/rk27xx/lcdif-rk27xx.h
@@ -6,11 +6,12 @@ enum lcdif_mode_t {
     LCDIF_18BIT
 };
 
-unsigned int lcd_data_transform(unsigned int data);
-
 void lcd_cmd(unsigned int cmd);
 void lcd_data(unsigned int data);
 void lcd_write_reg(unsigned int reg, unsigned int val);
-void lcdif_init(enum lcdif_mode_t mode);
+void lcdctrl_bypass(unsigned int on_off);
+void lcd_display_init(void);
+
+void lcd_set_gram_area(int x, int y, int width, int height);
 
 #endif /* _LCDIF_RK27XX_H */