[IMX8QXP MEK] How to rotate screen using U-BOOT

MahdiMG — Tue, 23 Nov 2021 12:51:57 GMT

Hello everyone,

I have an IMX8QXP MEK board to which I connected a panel via the LVDS0 interface. I added support for the panel in board/freescale/imx8qxp_mek/imx8qxp_mek.c as shown below:

struct display_info_t const displays[] = {{ .bus = 0, /* LVDS0 */ .addr = 0, /* LVDS0 */ .pixfmt = IMXDPUV1_PIX_FMT_BGRA32, .detect = NULL, .enable = enable_lvds, .mode = { .name = "MYPANEL", .refresh = 60, .xres = 256, .yres = 1920, .pixclock = 13468, /* 74250000 */ .left_margin = 150, .right_margin = 150, .upper_margin = 20, .lower_margin = 20, .hsync_len = 72, .vsync_len = 8, .sync = FB_SYNC_EXT, .vmode = FB_VMODE_NONINTERLACED } }};

In u-boot, I configured the display like this:

=> setenv panel MYPANEL => saveenv

Now I can see the NXP logo during u-boot like shown in the picture below:IMG_20211123_132724.jpg

The issue here is that the logo is mirrored, so I need to flip it then rotate it (90°) clockwise.

So I edited video_hw_init(void) in arch/arm/mach-imx/imx8/video_common.c like this:

imxdpuv1_init_channel_buffer(imxdpuv1_id, channel.common.chan, gmode.hlen * imxdpuv1_bytes_per_pixel(IMXDPUV1_PIX_FMT_RGB32), IMXDPUV1_ROTATE_90_RIGHT_HFLIP, /* rotation mode */ (dma_addr_t)fb, 0, 0);

I found rotation modes are defined like this in include/imxdpuv1.h:

/*! * Enumeration of IMXDPU rotation modes */ typedef enum { /* todo: these need to aligh to imxdpu scan direction */ IMXDPUV1_ROTATE_NONE = 0, IMXDPUV1_ROTATE_VERT_FLIP = 1, IMXDPUV1_ROTATE_HORIZ_FLIP = 2, IMXDPUV1_ROTATE_180 = 3, IMXDPUV1_ROTATE_90_RIGHT = 4, IMXDPUV1_ROTATE_90_RIGHT_VFLIP = 5, IMXDPUV1_ROTATE_90_RIGHT_HFLIP = 6, IMXDPUV1_ROTATE_90_LEFT = 7, } imxdpuv1_rotate_mode_t;

I tried different rotation modes but none has worked, it seems that screen rotation is not implemented. So what's the best way to achieve this? I need pointers.

Thank you for your help.

Have a nice day.

topic Re: [IMX8QXP MEK] How to rotate screen using U-BOOT in i.MX Processors

[IMX8QXP MEK] How to rotate screen using U-BOOT

Re: [IMX8QXP MEK] How to rotate screen using U-BOOT