linux-kernel - Re: [PATCH 1/1] serial: 8250_pci: fix support for MosChip 98xx boards

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Message-ID: <20140228232520.GA22275@kroah.com>
Date:	Fri, 28 Feb 2014 15:25:20 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	"Ira W. Snyder" <iws@...o.caltech.edu>
Cc:	linux-kernel@...r.kernel.org, gtdev@...arhead.de,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH 1/1] serial: 8250_pci: fix support for MosChip 98xx boards

On Fri, Feb 21, 2014 at 02:49:49PM -0800, Ira W. Snyder wrote:
> On Fri, Feb 21, 2014 at 02:46:17PM -0800, Ira W. Snyder wrote:
> > From: "Ira W. Snyder" <iws@...o.caltech.edu>
> > 
> > Commit 7808edcd306f22aeb23775d34e70b7fa2f58b852 "Basic support for
> > Moschip 9900 family I/O chips" broke support for the 98xx boards. This
> > is due to a missing check for the 99xx family inside the newly added
> > pci_netmos_9900_setup() function, which is now used for all boards in
> > the Moschip family.
> > 
> > The code for skipping BARs is incorrect for the 98xx boards. Using it
> > causes two serial ports to be left undetected on my 9865 board.
> > 
> > By checking for the 99xx boards and using the new code exclusively for
> > them, all of my serial ports are now detected.
> > 
> > Signed-off-by: Ira W. Snyder <iws@...o.caltech.edu>
> > ---
> > 
> > Here is the lspci output for my 9865 board. On the 05:00.2 device, the
> > middle two serial ports (I/O ports 0x1010 and 0x1008) are left unused
> > and undetected without this patch.
> > 
> > After the patch, they work perfectly.
> > 
> > 05:00.0 Serial controller: MosChip Semiconductor Technology Ltd. PCI 9865 Multi-I/O Controller (prog-if 02 [16550])
> > 	Subsystem: Device a000:1000
> > 	Flags: bus master, fast Back2Back, medium devsel, latency 32, IRQ 21
> > 	I/O ports at 1028 [size=8]
> > 	Memory at e0104000 (32-bit, non-prefetchable) [size=4K]
> > 	Memory at e0103000 (32-bit, non-prefetchable) [size=4K]
> > 	Capabilities: <access denied>
> > 	Kernel driver in use: serial
> > 	Kernel modules: parport_pc
> > 
> > 05:00.1 Serial controller: MosChip Semiconductor Technology Ltd. PCI 9865 Multi-I/O Controller (prog-if 02 [16550])
> > 	Subsystem: Device a000:1000
> > 	Flags: bus master, fast Back2Back, medium devsel, latency 32, IRQ 22
> > 	I/O ports at 1020 [size=8]
> > 	Memory at e0102000 (32-bit, non-prefetchable) [size=4K]
> > 	Memory at e0101000 (32-bit, non-prefetchable) [size=4K]
> > 	Capabilities: <access denied>
> > 	Kernel driver in use: serial
> > 	Kernel modules: parport_pc
> > 
> > 05:00.2 Communication controller: MosChip Semiconductor Technology Ltd. PCI 9865 Multi-I/O Controller
> > 	Subsystem: Device a000:3004
> > 	Flags: bus master, fast Back2Back, medium devsel, latency 32, IRQ 23
> > 	I/O ports at 1018 [size=8]
> > 	I/O ports at 1010 [size=8]
> > 	I/O ports at 1008 [size=8]
> > 	I/O ports at 1000 [size=8]
> > 	Memory at e0100000 (32-bit, non-prefetchable) [size=4K]
> > 	Capabilities: <access denied>
> > 	Kernel driver in use: serial
> > 
> >  drivers/tty/serial/8250/8250_pci.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
> > index 50228eed3b6f..374551f196c5 100644
> > --- a/drivers/tty/serial/8250/8250_pci.c
> > +++ b/drivers/tty/serial/8250/8250_pci.c
> > @@ -783,7 +783,8 @@ static int pci_netmos_9900_setup(struct serial_private *priv,
> >  {
> >  	unsigned int bar;
> >  
> > -	if ((priv->dev->subsystem_device & 0xff00) == 0x3000) {
> > +	if ((priv->dev->subsystem_device & 0xff00) == 0x3000 &&
> > +		(priv->dev->device & 0xff00) == 0x9900) {
> >  		/* netmos apparently orders BARs by datasheet layout, so serial
> >  		 * ports get BARs 0 and 3 (or 1 and 4 for memmapped)
> >  		 */
> > -- 
> > 1.8.3.2
> > 
> 
> Adding some CC's that were missed the first time. Greg's email address
> has changed.

Care to resend this in a format that I can apply it in?

thanks,

greg k-h
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