linux-kernel - [PATCH 4.9 18/66] serial: 8250: Correct the clock for EndRun PTP/1588 PCIe device

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220510130730.299292864@linuxfoundation.org>
Date:   Tue, 10 May 2022 15:07:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Maciej W. Rozycki" <macro@...am.me.uk>,
        stable <stable@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH 4.9 18/66] serial: 8250: Correct the clock for EndRun PTP/1588 PCIe device

From: Maciej W. Rozycki <macro@...am.me.uk>

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@...am.me.uk>
Cc: stable <stable@...nel.org>
Fixes: 1bc8cde46a159 ("8250_pci: Added driver for Endrun Technologies PTP PCIe card.")
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2204181515270.9383@angie.orcam.me.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/tty/serial/8250/8250_pci.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -2915,7 +2915,7 @@ 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,
@@ -3479,10 +3479,10 @@ 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,
 	},
@@ -4430,7 +4430,7 @@ static struct pci_device_id serial_pci_t
 	*/
 	{	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.