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Commit 08750617 authored by Kuninori Morimoto's avatar Kuninori Morimoto Committed by Florian Tobias Schandinat
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fbdev: sh_mipi_dsi: add VMLEN1/VMLEN2 calculation 



VMLEN1/VMLEN2 needs blanking length which is calculated from
video image size.

The calculation methods are explained on
[SH MIPI] - [Video Mode] - [Blanking Packet setting]
But HFPLEN (= VMLEN2) is un-understandable.

For example, if SH-MIPI input was RGB888 (3byte),
output was RGB888 (3byte)
and 3lane connection, the date goes straight.

But if SH-MIPI input was RGB888 (3byte),
output was RGB565 (2byte)
and 4lane connection, it needs delay in HFPLEN.
Then (input cycle - output cycle) * lane is necessary the delay

Signed-off-by: default avatarKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: default avatarMagnus Damm <damm@opensource.se>
Signed-off-by: default avatarFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
parent f832906a

drivers/video/sh_mipi_dsi.c

+40 −5
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ 
#define VMCTR1		0x0020

#define VMCTR2		0x0024

#define VMLEN1		0x0028

#define VMLEN2		0x002c

#define CMTSRTREQ	0x0070

#define CMTSRTCTR	0x00d0
@@ -153,8 +154,9 @@ static int __init sh_mipi_setup(struct sh_mipi *mipi, 
	void __iomem *base = mipi->base;

	struct sh_mobile_lcdc_chan_cfg *ch = pdata->lcd_chan;

	u32 pctype, datatype, pixfmt, linelength, vmctr2;

	u32 tmp, top, bottom, delay;

	bool yuv;

	u32 tmp;

	int bpp;



	/*

	 * Select data format. MIPI DSI is not hot-pluggable, so, we just use
@@ -342,11 +344,44 @@ static int __init sh_mipi_setup(struct sh_mipi *mipi, 
	iowrite32(vmctr2, mipi->linkbase + VMCTR2);



	/*

	 * 0x660 = 1632 bytes per line (RGB24, 544 pixels: see

	 * sh_mobile_lcdc_info.ch[0].lcd_cfg[0].xres), HSALEN = 1 - default

	 * (unused if VMCTR2[HSABM] = 0)

	 * VMLEN1 = RGBLEN | HSALEN

	 *

	 * see

	 *  Video mode - Blanking Packet setting

	 */

	top = linelength << 16; /* RGBLEN */

	bottom = 0x00000001;

	if (pdata->flags & SH_MIPI_DSI_HSABM) /* HSALEN */

		bottom = (pdata->lane * ch->lcd_cfg[0].hsync_len) - 10;

	iowrite32(top | bottom , mipi->linkbase + VMLEN1);



	/*

	 * VMLEN2 = HBPLEN | HFPLEN

	 *

	 * see

	 *  Video mode - Blanking Packet setting

	 */

	iowrite32(1 | (linelength << 16), mipi->linkbase + VMLEN1);

	top	= 0x00010000;

	bottom	= 0x00000001;

	delay	= 0;



	if (pdata->flags & SH_MIPI_DSI_HFPBM) {	/* HBPLEN */

		top = ch->lcd_cfg[0].hsync_len + ch->lcd_cfg[0].left_margin;

		top = ((pdata->lane * top) - 10) << 16;

	}

	if (pdata->flags & SH_MIPI_DSI_HBPBM) { /* HFPLEN */

		bottom = ch->lcd_cfg[0].right_margin;

		bottom = (pdata->lane * bottom) - 12;

	}



	bpp = linelength / ch->lcd_cfg[0].xres; /* byte / pixel */

	if (pdata->lane > bpp) {

		tmp = ch->lcd_cfg[0].xres / bpp; /* output cycle */

		tmp = ch->lcd_cfg[0].xres - tmp; /* (input - output) cycle */

		delay = (pdata->lane * tmp);

	}



	iowrite32(top | (bottom + delay) , mipi->linkbase + VMLEN2);



	msleep(5);