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@vger.kernel.org Signed-off-by: Biju Das biju.das.jz@bp.renesas.com --- v4->v5: * Added fixes tag * Updated commit header and description * Removed UPF_BOOT_AUTOCONF from flags. * Reordered the patch (from patch#4 to patch#1) to make it easier for applying it to stable branches. v3->v4: * Both {RZ/V2M, EMMA mobile} SoC is Register-compatible with the general-purpose 16750 UART chip. So started using generic compatible and removed struct serial8250_em_hw_info. * Removed Rb tag from Ilpo as it is new change. v2->v3: * Replaced of_device_get_match_data()->device_get_match_data(). * Replaced of_device.h->property.h * Dropped struct serial8250_em_hw_info *info from priv and started using a local variable info in probe(). * Retained Rb tag from Ilpo as changes are trivial. v2: * New patch --- 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 f8e99995eee9..d94c3811a8f7 100644 --- a/drivers/tty/serial/8250/8250_em.c +++ b/drivers/tty/serial/8250/8250_em.c @@ -106,8 +106,8 @@ static int serial8250_em_probe(struct platform_device *pdev) memset(&up, 0, sizeof(up)); up.port.mapbase = regs->start; up.port.irq = irq; - 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;