tty: serial: fsl_lpuart: fix the wrong mapbase value

stable inclusion
from linux-4.19.207
commit 600624ecbe35e0359806b107f247811b1f79ad25

--------------------------------

[ Upstream commit d5c38948 ]

Register offset needs to be applied on mapbase also.
dma_tx/rx_request use the physical address of UARTDATA.
Register offset is currently only applied to membase (the
corresponding virtual addr) but not on mapbase.

Fixes: 24b1e5f0 ("tty: serial: lpuart: add imx7ulp support")
Reviewed-by: NLeonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: NAdriana Reus <adriana.reus@nxp.com>
Signed-off-by: NSherry Sun <sherry.sun@nxp.com>
Signed-off-by: NAndy Duan <fugang.duan@nxp.com>
Link: https://lore.kernel.org/r/20210819021033.32606-1-sherry.sun@nxp.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/tty/serial/fsl_lpuart.c

@@ -2161,7 +2161,7 @@ static int lpuart_probe(struct platform_device *pdev)
 		return PTR_ERR(sport->port.membase);
 
 	sport->port.membase += sdata->reg_off;
-	sport->port.mapbase = res->start;
+	sport->port.mapbase = res->start + sdata->reg_off;
 	sport->port.dev = &pdev->dev;
 	sport->port.type = PORT_LPUART;
 	ret = platform_get_irq(pdev, 0);