// 首先强制类型转换为 unsigned char * 类型指针，再取这个地址的值， 最后赋值。
(*(volatile unsigned char *) (addr)) = (val);
} static inline unsigned readl(unsigned addr){
// 首先强制类型转换为 unsigned char * 类型指针，再取这个地址的值， 最后赋值。同理。
return (*(volatile unsigned *) (addr));}
#define MDP_DSI_VIDEO_EN (0xAA2F0000)#define MDP_DSI_VIDEO_HSYNC_CTL (0xAA2F0004)#define MDP_DSI_VIDEO_VSYNC_PERIOD (0xAA2F0008)#define MDP_DSI_VIDEO_VSYNC_PULSE_WIDTH (0xAA2F000C)#define MDP_DSI_VIDEO_DISPLAY_HCTL (0xAA2F0010)#define MDP_DSI_VIDEO_DISPLAY_V_START (0xAA2F0014)#define MDP_DSI_VIDEO_DISPLAY_V_END (0xAA2F0018)#define MDP_DSI_VIDEO_BORDER_CLR (0xAA2F0028)#define MDP_DSI_VIDEO_HSYNC_SKEW (0xAA2F0030)#define MDP_DSI_VIDEO_CTL_POLARITY (0xAA2F0038)#define MDP_DSI_VIDEO_TEST_CTL (0xAA2F0034)
void config_msm7627a_dsi_video_mode(unsigned short display_wd, unsigned short display_ht, unsigned short image_wd, unsigned short image_ht, unsigned short hsync_porch_fp, unsigned short hsync_porch_bp, unsigned short vsync_porch_fp, unsigned short vsync_porch_bp, unsigned short hsync_width, unsigned short vsync_width, unsigned char lane_en){ unsigned char dst_format = 3; /* RGB888 */ unsigned char traffic_mode = 2; /* non burst mode with sync start events */ unsigned long low_pwr_stop_mode = 1; unsigned char eof_bllp_pwr = 0x9; /* Needed or else will have blank line at top of display */ unsigned char interleav = 0; dprintf(SPEW, "DSI_Video_Mode - Dst Format: RGB888\n"); dprintf(SPEW, "Traffic mode: burst mode\n"); dprintf(SPEW, "Data Lane: %d lane\n", lane_en);// 下面都是用的writel 函数进行寄存器的赋值操作。 writel(0x00000000, MDP_DSI_VIDEO_EN);上面这个把MDP_DSI_VIDEO_EN 宏的值写到0x00000000 这个地址的寄存器里面 writel(0x00000000, DSI_CLK_CTRL); writel(0x00000000, DSI_CLK_CTRL); writel(0x00000000, DSI_CLK_CTRL); writel(0x00000000, DSI_CLK_CTRL); writel(0x00000002, DSI_CLK_CTRL); writel(0x00000006, DSI_CLK_CTRL); writel(0x0000000e, DSI_CLK_CTRL); writel(0x0000001e, DSI_CLK_CTRL); writel(0x0000003e, DSI_CLK_CTRL); writel(0, DSI_CTRL); writel(0, DSI_ERR_INT_MASK0); writel(0x02020202, DSI_INT_CTRL); writel(((hsync_porch_bp + display_wd) << 16) | hsync_porch_bp, DSI_VIDEO_MODE_ACTIVE_H); writel(((vsync_porch_bp + display_ht) << 16) | vsync_porch_bp, DSI_VIDEO_MODE_ACTIVE_V); writel(((display_ht + vsync_porch_fp + vsync_porch_bp) << 16) | (display_wd + hsync_porch_fp + hsync_porch_bp), DSI_VIDEO_MODE_TOTAL); writel((hsync_width) << 16 | 0, DSI_VIDEO_MODE_HSYNC); writel(0 << 16 | 0, DSI_VIDEO_MODE_VSYNC); writel(vsync_width << 16 | 0, DSI_VIDEO_MODE_VSYNC_VPOS); writel(1, DSI_EOT_PACKET_CTRL); writel(0x00000100, DSI_MISR_VIDEO_CTRL); writel(1 << 28 | 1 << 24 | 1 << 20 | low_pwr_stop_mode << 16 | eof_bllp_pwr << 12 | traffic_mode << 8 | dst_format << 4 | 0x0, DSI_VIDEO_MODE_CTRL); writel(0x67, DSI_CAL_STRENGTH_CTRL); writel(0x80006711, DSI_CAL_CTRL); writel(0x00010100, DSI_MISR_VIDEO_CTRL); writel(0x00010100, DSI_INT_CTRL); writel(0x02010202, DSI_INT_CTRL); writel(0x02030303, DSI_INT_CTRL); writel(interleav << 30 | 0 << 24 | 0 << 20 | lane_en << 4