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imx8/lcd: set iomux pad configuration

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

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

@@ -790,8 +790,14 @@

 static void

 backlighton(void)

 {

+	/* gpio1_io10: for panel backlight enable */

+	iomuxpad("pad_gpio1_io10", "gpio1_io10", "~LVTTL ~HYS ~PUE ~ODE FAST 45_OHM");

+

+	/* gpio1_io10 low: panel backlight off */

+	gpioout(GPIO_PIN(1, 10), 0);

+

 	/* pwm2_out: for panel backlight */

-	iomuxpad("pad_spdif_rx", "pwm2_out", nil);

+	iomuxpad("pad_spdif_rx", "pwm2_out", "~LVTTL ~HYS ~PUE ~ODE FAST 45_OHM");

 	setclkrate("pwm2.ipg_clk_high_freq", "osc_25m_ref_clk", Pwmsrcclk);

 	setclkgate("pwm2.ipg_clk_high_freq", 1);

@@ -801,6 +807,9 @@

 	wr(pwm2, PWMSAR, Pwmsrcclk/150000);

 	wr(pwm2, PWMPR, (Pwmsrcclk/100000)-2);

 	mr(pwm2, PWMCR, CR_EN, CR_EN);

+

+	/* gpio1_io10 high: panel backlight on */

+	gpioout(GPIO_PIN(1, 10), 1);

 }

 void

@@ -814,19 +823,10 @@

 	/* GPR13[MIPI_MUX_SEL]: 0 = LCDIF, 1 = DCSS */

 	iomuxgpr(13, 0, 1<<2);

-	/* gpio3_io20: sn65dsi86 bridge */

-	iomuxpad("pad_sai5_rxc", "gpio3_io20", nil);

-

-	/* gpio1_io10: for panel */

-	iomuxpad("pad_gpio1_io10", "gpio1_io10", nil);	

-	

-	/* gpio1_io10 low: panel off */

-	gpioout(GPIO_PIN(1, 10), 0);

-

 	backlighton();

-	/* gpio1_io10 high: panel on */

-	gpioout(GPIO_PIN(1, 10), 1);

+	/* gpio3_io20: sn65dsi86 bridge enable */

+	iomuxpad("pad_sai5_rxc", "gpio3_io20", "~LVTTL ~HYS ~PUE ~ODE FAST 45_OHM");	

 	/* gpio3_io20 high: bridge on */

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