linux-kernel - [PATCH 5.14 038/162] serial: 8250: 8250_omap: Fix RX

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Date:   Mon, 27 Sep 2021 19:01:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jan Kiszka <jan.kiszka@...mens.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Nishanth Menon <nm@...com>
Subject: [PATCH 5.14 038/162] serial: 8250: 8250_omap: Fix RX_LVL register offset

From: Nishanth Menon <nm@...com>

commit 79e9e30a9292a62d25ab75488d3886108db1eaad upstream.

Commit b67e830d38fa ("serial: 8250: 8250_omap: Fix possible interrupt
storm on K3 SoCs") introduced fixup including a register read to
RX_LVL, however, we should be using word offset than byte offset
since our registers are on 4 byte boundary (port.regshift = 2) for
8250_omap.

Fixes: b67e830d38fa ("serial: 8250: 8250_omap: Fix possible interrupt storm on K3 SoCs")
Cc: stable <stable@...r.kernel.org>
Cc: Jan Kiszka <jan.kiszka@...mens.com>
Cc: Vignesh Raghavendra <vigneshr@...com>
Signed-off-by: Nishanth Menon <nm@...com>
Link: https://lore.kernel.org/r/20210903050550.29050-1-nm@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/tty/serial/8250/8250_omap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -106,7 +106,7 @@
 #define UART_OMAP_EFR2_TIMEOUT_BEHAVE	BIT(6)
 
 /* RX FIFO occupancy indicator */
-#define UART_OMAP_RX_LVL		0x64
+#define UART_OMAP_RX_LVL		0x19
 
 struct omap8250_priv {
 	int line;