linux-kernel - Re: [PATCH 10/41] rt2800pci: add rt2800_register

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Message-Id: <200911061713.15898.bzolnier@gmail.com>
Date:	Fri, 6 Nov 2009 17:13:15 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Gertjan van Wingerde <gwingerde@...il.com>
Cc:	linux-wireless@...r.kernel.org, Ivo van Doorn <ivdoorn@...il.com>,
	linux-kernel@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>
Subject: Re: [PATCH 10/41] rt2800pci: add rt2800_register_[read,write]() wrappers

On Wednesday 04 November 2009 20:16:26 Gertjan van Wingerde wrote:
> On Wed, Nov 4, 2009 at 6:33 PM, Bartlomiej Zolnierkiewicz
> <bzolnier@...il.com> wrote:
> > From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> > Subject: [PATCH] rt2800pci: add rt2800_register_[read,write]() wrappers
> >
> > Part of preparations for later code unification.
> >
> > Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> > ---
> >  drivers/net/wireless/rt2x00/rt2800pci.c |  479 ++++++++++++++++----------------
> >  drivers/net/wireless/rt2x00/rt2800pci.h |   21 +
> >  2 files changed, 261 insertions(+), 239 deletions(-)
> >
> > Index: b/drivers/net/wireless/rt2x00/rt2800pci.c
> > ===================================================================
> > --- a/drivers/net/wireless/rt2x00/rt2800pci.c
> > +++ b/drivers/net/wireless/rt2x00/rt2800pci.c
> > @@ -57,7 +57,7 @@ MODULE_PARM_DESC(nohwcrypt, "Disable har
> >  /*
> >  * Register access.
> >  * All access to the CSR registers will go through the methods
> > - * rt2x00pci_register_read and rt2x00pci_register_write.
> > + * rt2800_register_read and rt2800_register_write.
> >  * BBP and RF register require indirect register access,
> >  * and use the CSR registers BBPCSR and RFCSR to achieve this.
> >  * These indirect registers work with busy bits,
> > @@ -66,6 +66,7 @@ MODULE_PARM_DESC(nohwcrypt, "Disable har
> >  * between each attampt. When the busy bit is still set at that time,
> >  * the access attempt is considered to have failed,
> >  * and we will print an error.
> > + * The _lock versions must be used if you already hold the csr_mutex
> >  */
> >  #define WAIT_FOR_BBP(__dev, __reg) \
> >        rt2x00pci_regbusy_read((__dev), BBP_CSR_CFG, BBP_CSR_CFG_BUSY, (__reg))
> 
> The change to the _lock variant seems a bit odd. See below.
> 
> <snip>
> 
> > Index: b/drivers/net/wireless/rt2x00/rt2800pci.h
> > ===================================================================
> > --- a/drivers/net/wireless/rt2x00/rt2800pci.h
> > +++ b/drivers/net/wireless/rt2x00/rt2800pci.h
> > @@ -27,6 +27,27 @@
> >  #ifndef RT2800PCI_H
> >  #define RT2800PCI_H
> >
> > +static inline void rt2800_register_read(struct rt2x00_dev *rt2x00dev,
> > +                                       const unsigned int offset,
> > +                                       u32 *value)
> > +{
> > +       rt2x00pci_register_read(rt2x00dev, offset, value);
> > +}
> > +
> > +static inline void rt2800_register_write(struct rt2x00_dev *rt2x00dev,
> > +                                        const unsigned int offset,
> > +                                        u32 value)
> > +{
> > +       rt2x00pci_register_write(rt2x00dev, offset, value);
> > +}
> > +
> > +static inline void rt2800_register_write_lock(struct rt2x00_dev *rt2x00dev,
> > +                                             const unsigned int offset,
> > +                                             u32 value)
> > +{
> > +       rt2x00pci_register_write(rt2x00dev, offset, value);
> > +}
> > +
> >  /*
> >  * RF chip defines.
> >  *
> 
> Can we add a comment to the _lock variant explaining that this one
> technically isn't
> needed, but is present for alignment purposes with rt2800usb?

I couldn't come with the good comment for it so I just went for
the minimal one in patch #25 (which removed all quoted above inlines):

+static const struct rt2800_ops rt2800pci_rt2800_ops = {
+       .register_read          = rt2x00pci_register_read,
+       .register_write         = rt2x00pci_register_write,
+       .register_write_lock    = rt2x00pci_register_write, /* same for PCI */
+
+       .register_multiread     = rt2x00pci_register_multiread,
+       .register_multiwrite    = rt2x00pci_register_multiwrite,
+
+       .regbusy_read           = rt2x00pci_regbusy_read,
+};

but it certainly can be expanded if somebody has a better idea how
the comment should look like.

-- 
Bartlomiej Zolnierkiewicz
--
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