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| author | Jiaqing Zhao <jiaqing.zhao@linux.intel.com> | 2023-06-19 18:57:44 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-23 14:49:43 +0300 |
| commit | 599c0ebdb5ccd9afecc326c09c7a95aa8cb9dbcb (patch) | |
| tree | 3617772035189a726e78a9358f6f4e2dd8bf6b01 /include | |
| parent | 801daff0078087b5df9145c9f5e643c28129734b (diff) | |
| download | linux-599c0ebdb5ccd9afecc326c09c7a95aa8cb9dbcb.tar.xz | |
Revert "8250: add support for ASIX devices with a FIFO bug"
commit a82d62f708545d22859584e0e0620da8e3759bbc upstream.
This reverts commit eb26dfe8aa7eeb5a5aa0b7574550125f8aa4c3b3.
Commit eb26dfe8aa7e ("8250: add support for ASIX devices with a FIFO
bug") merged on Jul 13, 2012 adds a quirk for PCI_VENDOR_ID_ASIX
(0x9710). But that ID is the same as PCI_VENDOR_ID_NETMOS defined in
1f8b061050c7 ("[PATCH] Netmos parallel/serial/combo support") merged
on Mar 28, 2005. In pci_serial_quirks array, the NetMos entry always
takes precedence over the ASIX entry even since it was initially
merged, code in that commit is always unreachable.
In my tests, adding the FIFO workaround to pci_netmos_init() makes no
difference, and the vendor driver also does not have such workaround.
Given that the code was never used for over a decade, it's safe to
revert it.
Also, the real PCI_VENDOR_ID_ASIX should be 0x125b, which is used on
their newer AX99100 PCIe serial controllers released on 2016. The FIFO
workaround should not be intended for these newer controllers, and it
was never implemented in vendor driver.
Fixes: eb26dfe8aa7e ("8250: add support for ASIX devices with a FIFO bug")
Cc: stable <stable@kernel.org>
Signed-off-by: Jiaqing Zhao <jiaqing.zhao@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230619155743.827859-1-jiaqing.zhao@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/serial_8250.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index 19376bee9667..79b328861c5f 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -98,7 +98,6 @@ struct uart_8250_port { struct list_head list; /* ports on this IRQ */ u32 capabilities; /* port capabilities */ unsigned short bugs; /* port bugs */ - bool fifo_bug; /* min RX trigger if enabled */ unsigned int tx_loadsz; /* transmit fifo load size */ unsigned char acr; unsigned char fcr; |