From 8973ab7a2441b286218f4a5c4c33680e2f139996 Mon Sep 17 00:00:00 2001
From: Ronald Wahl <ronald.wahl@raritan.com>
Date: Tue, 31 Oct 2023 12:09:09 +0100
Subject: [PATCH] serial: 8250: 8250_omap: Clear UART_HAS_RHR_IT_DIS bit
Git-commit: 8973ab7a2441b286218f4a5c4c33680e2f139996
Patch-mainline: v6.7-rc5
References: git-fixes
This fixes commit 439c7183e5b9 ("serial: 8250: 8250_omap: Disable RX
interrupt after DMA enable") which unfortunately set the
UART_HAS_RHR_IT_DIS bit in the UART_OMAP_IER2 register and never
cleared it.
Cc: stable@vger.kernel.org
Fixes: 439c7183e5b9 ("serial: 8250: 8250_omap: Disable RX interrupt after DMA enable")
Signed-off-by: Ronald Wahl <ronald.wahl@raritan.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20231031110909.11695-1-rwahl@gmx.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/tty/serial/8250/8250_omap.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 7d99bc3be0b8..578f35895b27 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -933,7 +933,7 @@ static void __dma_rx_do_complete(struct uart_8250_port *p)
if (priv->habit & UART_HAS_RHR_IT_DIS) {
reg = serial_in(p, UART_OMAP_IER2);
reg &= ~UART_OMAP_IER2_RHR_IT_DIS;
- serial_out(p, UART_OMAP_IER2, UART_OMAP_IER2_RHR_IT_DIS);
+ serial_out(p, UART_OMAP_IER2, reg);
}
dmaengine_tx_status(rxchan, cookie, &state);
@@ -1079,7 +1079,7 @@ static int omap_8250_rx_dma(struct uart_8250_port *p)
if (priv->habit & UART_HAS_RHR_IT_DIS) {
reg = serial_in(p, UART_OMAP_IER2);
reg |= UART_OMAP_IER2_RHR_IT_DIS;
- serial_out(p, UART_OMAP_IER2, UART_OMAP_IER2_RHR_IT_DIS);
+ serial_out(p, UART_OMAP_IER2, reg);
}
dma_async_issue_pending(dma->rxchan);
--
2.35.3