This is a note to let you know that I've just added the patch titled
serial: 8250: 8250_omap: Clear UART_HAS_RHR_IT_DIS bit
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-8250-8250_omap-clear-uart_has_rhr_it_dis-bit.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8973ab7a2441b286218f4a5c4c33680e2f139996 Mon Sep 17 00:00:00 2001
From: Ronald Wahl <ronald.wahl@xxxxxxxxxxx>
Date: Tue, 31 Oct 2023 12:09:09 +0100
Subject: serial: 8250: 8250_omap: Clear UART_HAS_RHR_IT_DIS bit
From: Ronald Wahl <ronald.wahl@xxxxxxxxxxx>
commit 8973ab7a2441b286218f4a5c4c33680e2f139996 upstream.
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@xxxxxxxxxxxxxxx
Fixes: 439c7183e5b9 ("serial: 8250: 8250_omap: Disable RX interrupt after DMA enable")
Signed-off-by: Ronald Wahl <ronald.wahl@xxxxxxxxxxx>
Reviewed-by: Vignesh Raghavendra <vigneshr@xxxxxx>
Link: https://lore.kernel.org/r/20231031110909.11695-1-rwahl@xxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_omap.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -844,7 +844,7 @@ static void __dma_rx_do_complete(struct
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);
@@ -986,7 +986,7 @@ static int omap_8250_rx_dma(struct uart_
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);
Patches currently in stable-queue which might be from ronald.wahl@xxxxxxxxxxx are
queue-5.10/serial-8250_omap-add-earlycon-support-for-the-am654-uart-controller.patch
queue-5.10/serial-8250-8250_omap-clear-uart_has_rhr_it_dis-bit.patch
queue-5.10/serial-8250-8250_omap-do-not-start-rx-dma-on-thri-interrupt.patch
