diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2026-06-26 11:49:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-07-10 14:47:16 +0200 |
| commit | b1b4efea05a56c0995e4702a86d6624b4fdff32f (patch) | |
| tree | 45ff87a2f0b5f7a577a06c6724adba39ed0d8775 | |
| parent | 061b627ba534230a18ec4d7251562af12325d06a (diff) | |
serial: 8250_mid: Disable DMA for selected platforms
In accordance with Errata (specification updates)
HSUART May Stop Functioning when DMA is Active.
- Denverton document #572409, rev 3.4, DNV60
- Ice Lake Xeon D document #714070, ICXD65
- Snowridge document #731931, SNR44
For a quick fix just disable the respective callbacks during the device probe.
Depending on the future development we might remove them completely.
Reported-by: micas-opensource <zjianan156@gmail.com>
Closes: https://lore.kernel.org/linux-serial/20250625031409.2404219-1-opensource@ruijie.com.cn/
Fixes: 6ede6dcd87aa ("serial: 8250_mid: add support for DMA engine handling from UART MMIO")
Cc: stable <stable@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260626094937.561776-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/8250/8250_mid.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c index 8ec03863606e..f88809ff370b 100644 --- a/drivers/tty/serial/8250/8250_mid.c +++ b/drivers/tty/serial/8250/8250_mid.c @@ -10,6 +10,7 @@ #include <linux/module.h> #include <linux/pci.h> #include <linux/rational.h> +#include <linux/util_macros.h> #include <linux/dma/hsu.h> @@ -368,8 +369,16 @@ static const struct mid8250_board dnv_board = { .freq = 133333333, .base_baud = 115200, .bar = 1, - .setup = dnv_setup, - .exit = dnv_exit, + /* + * Errata: + * HSUART May Stop Functioning when DMA is Active. + * + * - Denverton document #572409, rev 3.4, DNV60 + * - Ice Lake Xeon D document #714070, ICXD65 + * - Snowridge document #731931, SNR44 + */ + .setup = PTR_IF(false, dnv_setup), + .exit = PTR_IF(false, dnv_exit), }; static const struct pci_device_id pci_ids[] = { |