This is a note to let you know that I've just added the patch titled
serial: tegra: Change lower tolerance baud rate limit for tegra20 and tegra30
to the 4.19-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-tegra-change-lower-tolerance-baud-rate-limit-for-tegra20-and-tegra30.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b40de7469ef135161c80af0e8c462298cc5dac00 Mon Sep 17 00:00:00 2001
From: Patrik John <patrik.john@xxxxxxxxxx>
Date: Tue, 23 Nov 2021 14:27:38 +0100
Subject: serial: tegra: Change lower tolerance baud rate limit for tegra20 and tegra30
From: Patrik John <patrik.john@xxxxxxxxxx>
commit b40de7469ef135161c80af0e8c462298cc5dac00 upstream.
The current implementation uses 0 as lower limit for the baud rate
tolerance for tegra20 and tegra30 chips which causes isses on UART
initialization as soon as baud rate clock is lower than required even
when within the standard UART tolerance of +/- 4%.
This fix aligns the implementation with the initial commit description
of +/- 4% tolerance for tegra chips other than tegra186 and
tegra194.
Fixes: d781ec21bae6 ("serial: tegra: report clk rate errors")
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Patrik John <patrik.john@xxxxxxxxxx>
Link: https://lore.kernel.org/r/sig.19614244f8.20211123132737.88341-1-patrik.john@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/serial-tegra.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -1443,7 +1443,7 @@ static struct tegra_uart_chip_data tegra
.fifo_mode_enable_status = false,
.uart_max_port = 5,
.max_dma_burst_bytes = 4,
- .error_tolerance_low_range = 0,
+ .error_tolerance_low_range = -4,
.error_tolerance_high_range = 4,
};
@@ -1454,7 +1454,7 @@ static struct tegra_uart_chip_data tegra
.fifo_mode_enable_status = false,
.uart_max_port = 5,
.max_dma_burst_bytes = 4,
- .error_tolerance_low_range = 0,
+ .error_tolerance_low_range = -4,
.error_tolerance_high_range = 4,
};
Patches currently in stable-queue which might be from patrik.john@xxxxxxxxxx are
queue-4.19/serial-tegra-change-lower-tolerance-baud-rate-limit-for-tegra20-and-tegra30.patch
