Subject: [PATCH] ARM: OMAP: Cleanup Beagleboard DVI reset gpio

From: [email-masked] (Tony Lindgren)
Date: Wed, 9 May 2012 08:55:55 -0700

Hi Tomi,

* Russ Dill <[email-masked]> [120508 19:52]:
> This removes several boot warnings from board-omap3beagle.c:
> 
>  - gpio_request: gpio--22 (DVI reset) status -22
>  - Unable to get DVI reset GPIO
> 
> There is a combination of leftover code and revision confusion.
> Additionally, xM support is currently a hack.
> 
> For original Beagleboard this removes the double initialization of GPIO
> 170, properly configures it as an output, and wraps the initialization
> in an if block so that xM does not attempt to request it.
> 
> For Beagleboard xM it removes reference to GPIO 129 which was part
> of rev A1 and A2 designs, but never functioned. It then properly assigns
> beagle_dvi_device.reset_gpio in beagle_twl_gpio_setup and removes the
> hack of initializing it high. Additionally, it uses
> gpio_set_value_cansleep since this GPIO is connected through i2c.
> 
> Unfortunately, there is no way to tell the difference between xM A2 and
> A3. However, GPIO 129 does not function on rev A1 and A2, and the TWL
> GPIO used on A3 and beyond is not used on rev A1 and A2, there are no
> problems created by this fix.

Can you check if this needs updates for your clean up patches?

Regards,

Tony

> v3
>  - Change patch title to include 'ARM: OMAP:'
>  - Actually rename reset_gpio to dvi_reset_gpio
> 
> v2
>  - Rename reset_gpio to dvi_reset_gpio to self document
>  - Use gpio_set_value_cansleep since TWL gpio can sleep
>  - Use gpio_is_valid instead of -EINVAL check
> 
> Tested on Beagleboard-xM Rev C1 and Beagleboard Rev B4.
> 
> Signed-off-by: Russ Dill <[email-masked]>
> ---
>  arch/arm/mach-omap2/board-omap3beagle.c |   49 ++++++++++++++++---------------
>  1 file changed, 26 insertions(+), 23 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
> index 495b810..3956c51 100644
> --- a/arch/arm/mach-omap2/board-omap3beagle.c
> +++ b/arch/arm/mach-omap2/board-omap3beagle.c
> @@ -81,13 +81,13 @@ static u8 omap3_beagle_version;
>  static struct {
>  	int mmc1_gpio_wp;
>  	int usb_pwr_level;
> -	int reset_gpio;
> +	int dvi_reset_gpio;
>  	int usr_button_gpio;
>  	int mmc_caps;
>  } beagle_config = {
>  	.mmc1_gpio_wp = -EINVAL,
>  	.usb_pwr_level = GPIOF_OUT_INIT_LOW,
> -	.reset_gpio = 129,
> +	.dvi_reset_gpio = -EINVAL,
>  	.usr_button_gpio = 4,
>  	.mmc_caps = MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA,
>  };
> @@ -126,21 +126,21 @@ static void __init omap3_beagle_init_rev(void)
>  		printk(KERN_INFO "OMAP3 Beagle Rev: Ax/Bx\n");
>  		omap3_beagle_version = OMAP3BEAGLE_BOARD_AXBX;
>  		beagle_config.mmc1_gpio_wp = 29;
> -		beagle_config.reset_gpio = 170;
> +		beagle_config.dvi_reset_gpio = 170;
>  		beagle_config.usr_button_gpio = 7;
>  		break;
>  	case 6:
>  		printk(KERN_INFO "OMAP3 Beagle Rev: C1/C2/C3\n");
>  		omap3_beagle_version = OMAP3BEAGLE_BOARD_C1_3;
>  		beagle_config.mmc1_gpio_wp = 23;
> -		beagle_config.reset_gpio = 170;
> +		beagle_config.dvi_reset_gpio = 170;
>  		beagle_config.usr_button_gpio = 7;
>  		break;
>  	case 5:
>  		printk(KERN_INFO "OMAP3 Beagle Rev: C4\n");
>  		omap3_beagle_version = OMAP3BEAGLE_BOARD_C4;
>  		beagle_config.mmc1_gpio_wp = 23;
> -		beagle_config.reset_gpio = 170;
> +		beagle_config.dvi_reset_gpio = 170;
>  		beagle_config.usr_button_gpio = 7;
>  		break;
>  	case 0:
> @@ -196,7 +196,7 @@ static struct mtd_partition omap3beagle_nand_partitions[] = {
>  static int beagle_enable_dvi(struct omap_dss_device *dssdev)
>  {
>  	if (gpio_is_valid(dssdev->reset_gpio))
> -		gpio_set_value(dssdev->reset_gpio, 1);
> +		gpio_set_value_cansleep(dssdev->reset_gpio, 1);
>  
>  	return 0;
>  }
> @@ -204,7 +204,7 @@ static int beagle_enable_dvi(struct omap_dss_device *dssdev)
>  static void beagle_disable_dvi(struct omap_dss_device *dssdev)
>  {
>  	if (gpio_is_valid(dssdev->reset_gpio))
> -		gpio_set_value(dssdev->reset_gpio, 0);
> +		gpio_set_value_cansleep(dssdev->reset_gpio, 0);
>  }
>  
>  static struct panel_dvi_platform_data dvi_panel = {
> @@ -242,12 +242,17 @@ static struct omap_dss_board_info beagle_dss_data = {
>  
>  static void __init beagle_display_init(void)
>  {
> -	int r;
> -
> -	r = gpio_request_one(beagle_dvi_device.reset_gpio, GPIOF_OUT_INIT_LOW,
> -			     "DVI reset");
> -	if (r < 0)
> -		printk(KERN_ERR "Unable to get DVI reset GPIO\n");
> +	if (gpio_is_valid(beagle_config.dvi_reset_gpio)) {
> +		int r;
> +
> +		omap_mux_init_gpio(beagle_config.dvi_reset_gpio, OMAP_PIN_OUTPUT);
> +		r = gpio_request_one(beagle_config.dvi_reset_gpio,
> +				     GPIOF_OUT_INIT_LOW, "DVI reset");
> +		if (r < 0)
> +			printk(KERN_ERR "Unable to get DVI reset GPIO\n");
> +		else
> +			beagle_dvi_device.reset_gpio = beagle_config.dvi_reset_gpio;
> +	}
>  }
>  
>  #include "sdram-micron-mt46h32m32lf-6.h"
> @@ -299,11 +304,14 @@ static int beagle_twl_gpio_setup(struct device *dev,
>  		if (r)
>  			pr_err("%s: unable to configure nDVI_PWR_EN\n",
>  				__func__);
> -		r = gpio_request_one(gpio + 2, GPIOF_OUT_INIT_HIGH,
> -				     "DVI_LDO_EN");
> +
> +		r = gpio_request_one(gpio + 2, GPIOF_OUT_INIT_LOW,
> +				     "DVI_PU");
>  		if (r)
> -			pr_err("%s: unable to configure DVI_LDO_EN\n",
> -				__func__);
> +			pr_err("%s: unable to get DVI_PU GPIO\n", __func__);
> +		else
> +			beagle_dvi_device.reset_gpio = gpio + 2;
> +
>  	} else {
>  		/*
>  		 * REVISIT: need ehci-omap hooks for external VBUS
> @@ -312,7 +320,6 @@ static int beagle_twl_gpio_setup(struct device *dev,
>  		if (gpio_request_one(gpio + 1, GPIOF_IN, "EHCI_nOC"))
>  			pr_err("%s: unable to configure EHCI_nOC\n", __func__);
>  	}
> -	beagle_dvi_device.reset_gpio = beagle_config.reset_gpio;
>  
>  	gpio_request_one(gpio + TWL4030_GPIO_MAX, beagle_config.usb_pwr_level,
>  			"nEN_USB_PWR");
> @@ -524,7 +531,7 @@ static void __init omap3_beagle_init(void)
>  	omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
>  	omap3_beagle_init_rev();
>  
> -	if (beagle_config.mmc1_gpio_wp != -EINVAL)
> +	if (gpio_is_valid(beagle_config.mmc1_gpio_wp))
>  		omap_mux_init_gpio(beagle_config.mmc1_gpio_wp, OMAP_PIN_INPUT);
>  	mmc[0].caps = beagle_config.mmc_caps;
>  	omap_hsmmc_init(mmc);
> @@ -540,10 +547,6 @@ static void __init omap3_beagle_init(void)
>  	omap_sdrc_init(mt46h32m32lf6_sdrc_params,
>  				  mt46h32m32lf6_sdrc_params);
>  
> -	omap_mux_init_gpio(170, OMAP_PIN_INPUT);
> -	/* REVISIT leave DVI powered down until it's needed ... */
> -	gpio_request_one(170, GPIOF_OUT_INIT_HIGH, "DVI_nPD");
> -
>  	usb_musb_init(NULL);
>  	usbhs_init(&usbhs_bdata);
>  	omap_nand_flash_init(NAND_BUSWIDTH_16, omap3beagle_nand_partitions,
> -- 
> 1.7.9.5
> 
> --
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