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imx8: reset lcdif and sn65sdi86 bridge before init

--- a/sys/src/9/imx8/lcd.c

+++ b/sys/src/9/imx8/lcd.c

@@ -441,6 +441,14 @@

 }

 static void

+lcdifreset(void)

+{

+	wr(lcdif, LCDIF_CTRL_SET, CTRL_SFTRST);

+	delay(1);

+	wr(lcdif, LCDIF_CTRL_SET, CTRL_CLKGATE);

+}

+

+static void

 lcdifinit(struct video_mode *mode)

 {

 	wr(lcdif, LCDIF_CTRL_CLR, CTRL_SFTRST);

@@ -501,6 +509,11 @@

 {

 	int n;

+	// soft reset

+	i2cwritebyte(dev, 0x09, 1);

+	while(i2creadbyte(dev, 0x09) & 1)

+		;

+

 	// clock derived from dsi clock

 	switch(cfg->hs_clk/2000000){

 	case 384:

@@ -838,8 +851,10 @@

 	gpioout(GPIO_PIN(3, 20), 1);

 	bridge = i2cdev(i2cbus("i2c4"), 0x2C);

-	if(bridge == nil)

-		return;

+	if(bridge == nil){

+		err = "could not find bridge";

+		goto out;

+	}

 	bridge->subaddr = 1;

 	/* power on mipi dsi */

@@ -857,6 +872,8 @@

 	setclkrate("disp.rtrm_clk", "system_pll1_clk", 400*Mhz);

 	setclkgate("disp.axi_clk", 1);

 	setclkgate("sim_display.mainclk", 1);

+

+	lcdifreset();

 	setclkrate("mipi.core", "system_pll1_div3", 266*Mhz);

 	setclkrate("mipi.CLKREF", "system_pll2_clk", 25*Mhz);