linux-kernel - Re: [PATCH 1/1] 8250_dwlib: Convert bitops to newer form

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Date:   Thu, 30 Jun 2022 13:20:49 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] 8250_dwlib: Convert bitops to newer form

On Thu, 30 Jun 2022, Andy Shevchenko wrote:

> On Thu, Jun 30, 2022 at 12:08 PM Ilpo Järvinen
> <ilpo.jarvinen@...ux.intel.com> wrote:
> >
> > Instead of open-coding, use BIT(), GENMASK(), and FIELD_GET() helpers.
> 
> FIELD_GET() requires bitfield.h to be included. Is this the case already?

It's there already.

-- 
 i.

> If so,
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> 
> > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> > ---
> >  drivers/tty/serial/8250/8250_dwlib.c | 26 +++++++++++++-------------
> >  1 file changed, 13 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/tty/serial/8250/8250_dwlib.c b/drivers/tty/serial/8250/8250_dwlib.c
> > index da330ef46446..a8bbed74ea70 100644
> > --- a/drivers/tty/serial/8250/8250_dwlib.c
> > +++ b/drivers/tty/serial/8250/8250_dwlib.c
> > @@ -46,21 +46,21 @@
> >  #define DW_UART_LCR_EXT_TRANSMIT_MODE  BIT(3)
> >
> >  /* Component Parameter Register bits */
> > -#define DW_UART_CPR_ABP_DATA_WIDTH     (3 << 0)
> > -#define DW_UART_CPR_AFCE_MODE          (1 << 4)
> > -#define DW_UART_CPR_THRE_MODE          (1 << 5)
> > -#define DW_UART_CPR_SIR_MODE           (1 << 6)
> > -#define DW_UART_CPR_SIR_LP_MODE                (1 << 7)
> > -#define DW_UART_CPR_ADDITIONAL_FEATURES        (1 << 8)
> > -#define DW_UART_CPR_FIFO_ACCESS                (1 << 9)
> > -#define DW_UART_CPR_FIFO_STAT          (1 << 10)
> > -#define DW_UART_CPR_SHADOW             (1 << 11)
> > -#define DW_UART_CPR_ENCODED_PARMS      (1 << 12)
> > -#define DW_UART_CPR_DMA_EXTRA          (1 << 13)
> > -#define DW_UART_CPR_FIFO_MODE          (0xff << 16)
> > +#define DW_UART_CPR_ABP_DATA_WIDTH     GENMASK(1, 0)
> > +#define DW_UART_CPR_AFCE_MODE          BIT(4)
> > +#define DW_UART_CPR_THRE_MODE          BIT(5)
> > +#define DW_UART_CPR_SIR_MODE           BIT(6)
> > +#define DW_UART_CPR_SIR_LP_MODE                BIT(7)
> > +#define DW_UART_CPR_ADDITIONAL_FEATURES        BIT(8)
> > +#define DW_UART_CPR_FIFO_ACCESS                BIT(9)
> > +#define DW_UART_CPR_FIFO_STAT          BIT(10)
> > +#define DW_UART_CPR_SHADOW             BIT(11)
> > +#define DW_UART_CPR_ENCODED_PARMS      BIT(12)
> > +#define DW_UART_CPR_DMA_EXTRA          BIT(13)
> > +#define DW_UART_CPR_FIFO_MODE          GENMASK(23, 16)
> >
> >  /* Helper for FIFO size calculation */
> > -#define DW_UART_CPR_FIFO_SIZE(a)       (((a >> 16) & 0xff) * 16)
> > +#define DW_UART_CPR_FIFO_SIZE(a)       (FIELD_GET(DW_UART_CPR_FIFO_MODE, (a)) * 16)
> >
> >  /*
> >   * divisor = div(I) + div(F)
> > --
> > 2.30.2
> >
> 
> 
>