tty: serial: sh-sci: Fix transmit end interrupt handler

commit b43a18647f03c87e77d50d6fe74904b61b96323e upstream.

The fourth interrupt on SCI port is transmit end interrupt compared to
the break interrupt on other port types. So, shuffle the interrupts to fix
the transmit end interrupt handler.

Fixes: e1d0be616186 ("sh-sci: Add h8300 SCI")
Cc: stable <stable@kernel.org>
Suggested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20230317150403.154094-1-biju.das.jz@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 62f773286d44bb312f67f664799494fb2405276a..ef8858cc2c7f4abc8d5faf937ad298c14c0f78ed 100644 (file)
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -31,6 +31,7 @@
 #include <linux/ioport.h>
 #include <linux/ktime.h>
 #include <linux/major.h>
+#include <linux/minmax.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/of.h>
@@ -2867,6 +2868,13 @@ static int sci_init_single(struct platform_device *dev,
                        sci_port->irqs[i] = platform_get_irq(dev, i);
        }
 
+       /*
+        * The fourth interrupt on SCI port is transmit end interrupt, so
+        * shuffle the interrupts.
+        */
+       if (p->type == PORT_SCI)
+               swap(sci_port->irqs[SCIx_BRI_IRQ], sci_port->irqs[SCIx_TEI_IRQ]);
+
        /* The SCI generates several interrupts. They can be muxed together or
         * connected to different interrupt lines. In the muxed case only one
         * interrupt resource is specified as there is only one interrupt ID.