[U-Boot] [PATCH] dm: mmc: sandbox: Update SD card emulation

[Jaehoon Chung]

On 12/14/2017 07:47 PM, Jean-Jacques Hiblot wrote:
> The SDcard initialization procedure does a few more things than it did earlier:
> * switch the bus width even for 1-bit bus width
> * check that speed has been properly set (in resp[4] of SD_CMD_SWITCH_FUNC)
> 
> Update the SD simulator to handle those requests gracefully.
> 
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot at ti.com>

Reviewed-by: Jaehoon Chung <jh80.chung at samsung.com>

> ---
> 
> This patch makes 'make tests' work again with the HS200/UHS support.
> The new SD initialization procedures checks the content of resp[4] because
> it indicates the speed of the card.
> This patch also fixes a crash occurring during bus width selection (NULL
> pointer).
> 
> Jean-Jacques
> 
> drivers/mmc/sandbox_mmc.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/sandbox_mmc.c b/drivers/mmc/sandbox_mmc.c
> index fdb29a5..8a5d256 100644
> --- a/drivers/mmc/sandbox_mmc.c
> +++ b/drivers/mmc/sandbox_mmc.c
> @@ -48,9 +48,12 @@ static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
>  		cmd->response[1] = 10 << 16;	/* 1 << block_len */
>  		break;
>  	case SD_CMD_SWITCH_FUNC: {
> +		if (!data)
> +			break;
>  		u32 *resp = (u32 *)data->dest;
> -
>  		resp[7] = cpu_to_be32(SD_HIGHSPEED_BUSY);
> +		if ((cmd->cmdarg & 0xF) == UHS_SDR12_BUS_SPEED)
> +			resp[4] = (cmd->cmdarg & 0xF) << 24;
>  		break;
>  	}
>  	case MMC_CMD_READ_SINGLE_BLOCK:
>