[PATCH] imx8qxp_mek: Start with USDHC2 unpowered

[Peng Fan]

> Subject: [PATCH] imx8qxp_mek: Start with USDHC2 unpowered
> 
> After triggering a "reboot" command in Linux the following hang in SPL is
> observed:
> 
> U-Boot SPL 2020.04 (Apr 15 2020 - 10:49:29 -0300) Normal Boot
> WDT:   Not found!
> Trying to boot from MMC2_2
> spl: mmc init failed with error: -70
> SPL: failed to boot from all boot devices ### ERROR ### Please RESET the
> board ###
> 
> This error happens because the CMD_ERR bit is set in the IRQ status register
> after booting from Linux.
> 
> To ensure a fresh start, force the VMMC supply to get unpowered first.
> 
> Signed-off-by: Fabio Estevam <festevam at gmail.com>

Reviewed-by: Peng Fan <peng.fan at nxp.com>

> ---
>  board/freescale/imx8qxp_mek/spl.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/board/freescale/imx8qxp_mek/spl.c
> b/board/freescale/imx8qxp_mek/spl.c
> index cb4006eb2a..e4e4cbe716 100644
> --- a/board/freescale/imx8qxp_mek/spl.c
> +++ b/board/freescale/imx8qxp_mek/spl.c
> @@ -12,9 +12,24 @@
>  #include <dm/uclass-internal.h>
>  #include <dm/device-internal.h>
>  #include <dm/lists.h>
> +#include <asm/io.h>
> +#include <asm/gpio.h>
> +#include <asm/arch/sci/sci.h>
> +#include <asm/arch/imx8-pins.h>
> +#include <asm/arch/iomux.h>
> 
>  DECLARE_GLOBAL_DATA_PTR;
> 
> +#define GPIO_PAD_CTRL	((SC_PAD_CONFIG_NORMAL <<
> PADRING_CONFIG_SHIFT) | \
> +			 (SC_PAD_ISO_OFF << PADRING_LPCONFIG_SHIFT) | \
> +			 (SC_PAD_28FDSOI_DSE_DV_HIGH << PADRING_DSE_SHIFT) |
> \
> +			 (SC_PAD_28FDSOI_PS_PU << PADRING_PULL_SHIFT))
> +
> +#define USDHC2_SD_PWR IMX_GPIO_NR(4, 19) static iomux_cfg_t
> +usdhc2_sd_pwr[] = {
> +	SC_P_USDHC1_RESET_B | MUX_PAD_CTRL(GPIO_PAD_CTRL), };
> +
>  void spl_board_init(void)
>  {
>  	struct udevice *dev;
> @@ -32,6 +47,9 @@ void spl_board_init(void)
> 
>  	timer_init();
> 
> +	imx8_iomux_setup_multiple_pads(usdhc2_sd_pwr,
> ARRAY_SIZE(usdhc2_sd_pwr));
> +	gpio_direction_output(USDHC2_SD_PWR, 0);
> +
>  	preloader_console_init();
> 
>  	puts("Normal Boot\n");
> --
> 2.17.1