This is a note to let you know that I've just added the patch titled
serial: 8250_pci: Correct uartclk for xr17v35x expansion chips
to the 3.14-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-8250_pci-correct-uartclk-for-xr17v35x-expansion-chips.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 899f0c1c7dbcc487fdc8756a49ff70b1d5d75f89 Mon Sep 17 00:00:00 2001
From: Soeren Grunewald <soeren.grunewald@xxxxxxx>
Date: Thu, 11 Jun 2015 09:25:05 +0200
Subject: serial: 8250_pci: Correct uartclk for xr17v35x expansion chips
From: Soeren Grunewald <soeren.grunewald@xxxxxxx>
commit 899f0c1c7dbcc487fdc8756a49ff70b1d5d75f89 upstream.
The internal clock of the master chip, which is usually 125MHz, is only half
(62.5MHz) for the slave chips. So we have to adjust the uartclk for all the
slave ports. Therefor we add a new function to determine if a slave chip is
present and update pci_xr17v35x_setup accordingly.
Signed-off-by: Soeren Grunewald <soeren.grunewald@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_pci.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1613,6 +1613,9 @@ static int pci_eg20t_init(struct pci_dev
#endif
}
+#define PCI_DEVICE_ID_EXAR_XR17V4358 0x4358
+#define PCI_DEVICE_ID_EXAR_XR17V8358 0x8358
+
static int
pci_xr17c154_setup(struct serial_private *priv,
const struct pciserial_board *board,
@@ -1622,6 +1625,15 @@ pci_xr17c154_setup(struct serial_private
return pci_default_setup(priv, board, port, idx);
}
+static inline int
+xr17v35x_has_slave(struct serial_private *priv)
+{
+ const int dev_id = priv->dev->device;
+
+ return ((dev_id == PCI_DEVICE_ID_EXAR_XR17V4358) ||
+ (dev_id == PCI_DEVICE_ID_EXAR_XR17V8358));
+}
+
static int
pci_xr17v35x_setup(struct serial_private *priv,
const struct pciserial_board *board,
@@ -1636,6 +1648,13 @@ pci_xr17v35x_setup(struct serial_private
port->port.flags |= UPF_EXAR_EFR;
/*
+ * Setup the uart clock for the devices on expansion slot to
+ * half the clock speed of the main chip (which is 125MHz)
+ */
+ if (xr17v35x_has_slave(priv) && idx >= 8)
+ port->port.uartclk = (7812500 * 16 / 2);
+
+ /*
* Setup Multipurpose Input/Output pins.
*/
if (idx == 0) {
@@ -1772,9 +1791,6 @@ pci_wch_ch353_setup(struct serial_privat
#define PCI_DEVICE_ID_SUNIX_1999 0x1999
-#define PCI_DEVICE_ID_EXAR_XR17V4358 0x4358
-#define PCI_DEVICE_ID_EXAR_XR17V8358 0x8358
-
/* Unknown vendors/cards - this should not be in linux/pci_ids.h */
#define PCI_SUBDEVICE_ID_UNKNOWN_0x1584 0x1584
#define PCI_SUBDEVICE_ID_UNKNOWN_0x1588 0x1588
Patches currently in stable-queue which might be from soeren.grunewald@xxxxxxx are
queue-3.14/serial-8250_pci-correct-uartclk-for-xr17v35x-expansion-chips.patch
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