imx8m mini MIPI

darcyxu — Tue, 06 Apr 2021 07:13:10 GMT

IMX8M MINI MIPI interface:

when we use RGB888 mode, a pixel needs 24bit (3byte). For the MIPI interface of iMX8M Mini, if it can transmit 4/3 pixel (4 byte mode) or 1 pixel (3 byte mode) per one MIPI CLK? Or support both methods? Which register can be used for the corresponding setting?

if LCD_DATABUS_WIDTH= 0x3 is OK?

Re: imx8m mini MIPI

joanxie — Wed, 07 Apr 2021 03:12:26 GMT

refer to the reference manual:

LCDIF_CTRL[WORD_LENGTH]=3 indicates that the input frame-buffer is RGB
24 bits per pixel (RGB 888). If LCDIF_CTRL1[BYTE_PACKING_FORMAT] is
0x7, it indicates that there is only one pixel per 32-bit word and there is no restriction
on LCDIF_TRANSFER_COUNT[H_COUNT].
Limitation: If LCDIF_CTRL1[BYTE_PACKING_FORMAT] is 0xF, it indicates
that the pixels are packed, that is, there are 4 pixels in 3 words or 12 bytes and
LCDIF_TRANSFER_COUNT[H_COUNT] must be a multiple of 4 pixels.

refer to the source code of mipi , you can find :

case MIPI_DSI_FMT_RGB888:
		return COL_FMT_24BPP;

"https://source.codeaurora.org/external/imx/linux-imx/tree/drivers/gpu/drm/panel/panel-raydium-rm67191.c?h=imx_5.4.47_2.2.0"

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imx8m mini MIPI

Re: imx8m mini MIPI