AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

serial: 8250: Correct the clock for EndRun PTP/1588 PCIe device

Browse Source 
commit 637674fa40059cddcc3ad2212728965072f62ea3 upstream.

The EndRun PTP/1588 dual serial port device is based on the Oxford
Semiconductor OXPCIe952 UART device with the PCI vendor:device ID set
for EndRun Technologies and is therefore driven by a fixed 62.5MHz clock
input derived from the 100MHz PCI Express clock.  The clock rate is
divided by the oversampling rate of 16 as it is supplied to the baud
rate generator, yielding the baud base of 3906250.

Replace the incorrect baud base of 4000000 with the right value of
3906250 then, complementing commit 6cbe45d8ac93 ("serial: 8250: Correct
the clock for OxSemi PCIe devices").

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Cc: stable <stable@kernel.org>
Fixes: 1bc8cde46a ("8250_pci: Added driver for Endrun Technologies PTP PCIe card.")
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2204181515270.9383@angie.orcam.me.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maciej W. Rozycki 2022-04-18 16:27:16 +01:00 committed by Greg Kroah-Hartman
parent 662f945a20
commit aaee3f6617
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/tty/serial/8250/8250_pci.c
View File

@ -2940,7 +2940,7 @@ enum pci_board_num_t {
pbn_panacom2,
pbn_panacom4,
pbn_plx_romulus,
pbn_endrun_2_4000000,
pbn_endrun_2_3906250,
pbn_oxsemi,
pbn_oxsemi_1_4000000,
pbn_oxsemi_2_4000000,
@ -3468,10 +3468,10 @@ static struct pciserial_board pci_boards[] = {
* signal now many ports are available
* 2 port 952 Uart support
*/
[pbn_endrun_2_4000000] = {
[pbn_endrun_2_3906250] = {
.flags = FL_BASE0,
.num_ports = 2,
.base_baud = 4000000,
.base_baud = 3906250,
.uart_offset = 0x200,
.first_offset = 0x1000,
},
@ -4386,7 +4386,7 @@ static const struct pci_device_id serial_pci_tbl[] = {
*/
{ PCI_VENDOR_ID_ENDRUN, PCI_DEVICE_ID_ENDRUN_1588,
PCI_ANY_ID, PCI_ANY_ID, 0, 0,
pbn_endrun_2_4000000 },
pbn_endrun_2_3906250 },
/*
* Quatech cards. These actually have configurable clocks but for
* now we just use the default.