[PATCH] serial: 8250_em: Fix UART port type

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commit 32e293be736b853f168cd065d9cbc1b0c69f545d upstream.

As per HW manual for  EMEV2 "R19UH0040EJ0400 Rev.4.00", the UART
IP found on EMMA mobile SoC is Register-compatible with the
general-purpose 16750 UART chip. Fix UART port type as 16750 and
enable 64-bytes fifo support.

Fixes: 22886ee96895 ("serial8250-em: Emma Mobile UART driver V2")
Cc: stable@xxxxxxxxxxxxxxx # 4.19.y
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230227114152.22265-2-biju.das.jz@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[biju: manually fixed the conflicts]
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
Resending to 4.19 with confilcts [1] fixed.
[1] https://lore.kernel.org/stable/1679303539169236@xxxxxxxxx/
---
 drivers/tty/serial/8250/8250_em.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_em.c b/drivers/tty/serial/8250/8250_em.c
index 2a76e22d2ec0..5670c8a267d8 100644
--- a/drivers/tty/serial/8250/8250_em.c
+++ b/drivers/tty/serial/8250/8250_em.c
@@ -102,8 +102,8 @@ static int serial8250_em_probe(struct platform_device *pdev)
 	memset(&up, 0, sizeof(up));
 	up.port.mapbase = regs->start;
 	up.port.irq = irq->start;
-	up.port.type = PORT_UNKNOWN;
-	up.port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_IOREMAP;
+	up.port.type = PORT_16750;
+	up.port.flags = UPF_FIXED_PORT | UPF_IOREMAP | UPF_FIXED_TYPE;
 	up.port.dev = &pdev->dev;
 	up.port.private_data = priv;
 
-- 
2.25.1




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