greybus: sdio: send data block details at command request

If SDIO request include data to be transfer send details (data blocks
and block size) in command request, as it seems some controllers need
this info prior to set the registers correctly.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/greybus_protocols.h

@@ -1088,6 +1088,8 @@ struct gb_sdio_command_request {
 #define GB_SDIO_CMD_BCR		0x03
 
 	__le32	cmd_arg;
+	__le16	data_blocks;
+	__le16	data_blksz;
 } __packed;
 
 struct gb_sdio_command_response {

drivers/staging/greybus/sdio.c

@@ -373,8 +373,9 @@ static int gb_sdio_transfer(struct gb_sdio_host *host, struct mmc_data *data)
 
 static int gb_sdio_command(struct gb_sdio_host *host, struct mmc_command *cmd)
 {
-	struct gb_sdio_command_request request;
+	struct gb_sdio_command_request request = {0};
 	struct gb_sdio_command_response response;
+	struct mmc_data *data = host->mrq->data;
 	u8 cmd_flags;
 	u8 cmd_type;
 	int i;
@@ -427,6 +428,11 @@ static int gb_sdio_command(struct gb_sdio_host *host, struct mmc_command *cmd)
 	request.cmd_flags = cmd_flags;
 	request.cmd_type = cmd_type;
 	request.cmd_arg = cpu_to_le32(cmd->arg);
+	/* some controllers need to know at command time data details */
+	if (data) {
+		request.data_blocks = cpu_to_le16(data->blocks);
+		request.data_blksz = cpu_to_le16(data->blksz);
+	}
 
 	ret = gb_operation_sync(host->connection, GB_SDIO_TYPE_COMMAND,
 				&request, sizeof(request), &response,