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

[Jean-Jacques Hiblot]

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>
---

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:
-- 
1.9.1