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 <36db7be3-73b6-c822-02e8-13e3864b0463@xilinx.com>
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From:   Bartosz Golaszewski <bgolaszewski@baylibre.com>
Date:   Fri, 26 Mar 2021 18:27:33 +0100
Message-ID: <CAMpxmJUv0iU0Ntmks1f6ThDAG6x_eJLYYCaDSjy+1Syedzc5dQ@mail.gmail.com>
Subject: Re: [PATCH v3 3/3] gpio: xilinx: Utilize generic bitmap_get_value and _set_value
To:     Michal Simek <michal.simek@xilinx.com>
Cc:     Syed Nayyar Waris <syednwaris@gmail.com>,
        Srinivas Neeli <srinivas.neeli@xilinx.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        William Breathitt Gray <vilhelm.gray@gmail.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Robert Richter <rrichter@marvell.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Zhang Rui <rui.zhang@intel.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Amit Kucheria <amit.kucheria@verdurent.com>,
        Linux-Arch <linux-arch@vger.kernel.org>,
        linux-gpio <linux-gpio@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        arm-soc <linux-arm-kernel@lists.infradead.org>,
        linux-pm <linux-pm@vger.kernel.org>,
        Srinivas Goud <srinivas.goud@xilinx.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Mon, Mar 8, 2021 at 8:13 AM Michal Simek <michal.simek@xilinx.com> wrote:
>
>
>
> On 3/6/21 3:06 PM, Syed Nayyar Waris wrote:
> > This patch reimplements the xgpio_set_multiple() function in
> > drivers/gpio/gpio-xilinx.c to use the new generic functions:
> > bitmap_get_value() and bitmap_set_value(). The code is now simpler
> > to read and understand. Moreover, instead of looping for each bit
> > in xgpio_set_multiple() function, now we can check each channel at
> > a time and save cycles.
> >
> > Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> > Cc: Michal Simek <michal.simek@xilinx.com>
> > Signed-off-by: Syed Nayyar Waris <syednwaris@gmail.com>
> > Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>
> > ---
> >  drivers/gpio/gpio-xilinx.c | 63 +++++++++++++++++++-------------------
> >  1 file changed, 32 insertions(+), 31 deletions(-)
> >
> > diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
> > index be539381fd82..8445e69cf37b 100644
> > --- a/drivers/gpio/gpio-xilinx.c
> > +++ b/drivers/gpio/gpio-xilinx.c
> > @@ -15,6 +15,7 @@
> >  #include <linux/of_device.h>
> >  #include <linux/of_platform.h>
> >  #include <linux/slab.h>
> > +#include "gpiolib.h"
> >
> >  /* Register Offset Definitions */
> >  #define XGPIO_DATA_OFFSET   (0x0)    /* Data register  */
> > @@ -141,37 +142,37 @@ static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
> >  {
> >       unsigned long flags;
> >       struct xgpio_instance *chip = gpiochip_get_data(gc);
> > -     int index = xgpio_index(chip, 0);
> > -     int offset, i;
> > -
> > -     spin_lock_irqsave(&chip->gpio_lock[index], flags);
> > -
> > -     /* Write to GPIO signals */
> > -     for (i = 0; i < gc->ngpio; i++) {
> > -             if (*mask == 0)
> > -                     break;
> > -             /* Once finished with an index write it out to the register */
> > -             if (index !=  xgpio_index(chip, i)) {
> > -                     xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET +
> > -                                    index * XGPIO_CHANNEL_OFFSET,
> > -                                    chip->gpio_state[index]);
> > -                     spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
> > -                     index =  xgpio_index(chip, i);
> > -                     spin_lock_irqsave(&chip->gpio_lock[index], flags);
> > -             }
> > -             if (__test_and_clear_bit(i, mask)) {
> > -                     offset =  xgpio_offset(chip, i);
> > -                     if (test_bit(i, bits))
> > -                             chip->gpio_state[index] |= BIT(offset);
> > -                     else
> > -                             chip->gpio_state[index] &= ~BIT(offset);
> > -             }
> > -     }
> > -
> > -     xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET +
> > -                    index * XGPIO_CHANNEL_OFFSET, chip->gpio_state[index]);
> > -
> > -     spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
> > +     u32 *const state = chip->gpio_state;
> > +     unsigned int *const width = chip->gpio_width;
> > +
> > +     DECLARE_BITMAP(old, 64);
> > +     DECLARE_BITMAP(new, 64);
> > +     DECLARE_BITMAP(changed, 64);
> > +
> > +     spin_lock_irqsave(&chip->gpio_lock[0], flags);
> > +     spin_lock(&chip->gpio_lock[1]);
> > +
> > +     bitmap_set_value(old, 64, state[0], width[0], 0);
> > +     bitmap_set_value(old, 64, state[1], width[1], width[0]);
> > +     bitmap_replace(new, old, bits, mask, gc->ngpio);
> > +
> > +     bitmap_set_value(old, 64, state[0], 32, 0);
> > +     bitmap_set_value(old, 64, state[1], 32, 32);
> > +     state[0] = bitmap_get_value(new, 0, width[0]);
> > +     state[1] = bitmap_get_value(new, width[0], width[1]);
> > +     bitmap_set_value(new, 64, state[0], 32, 0);
> > +     bitmap_set_value(new, 64, state[1], 32, 32);
> > +     bitmap_xor(changed, old, new, 64);
> > +
> > +     if (((u32 *)changed)[0])
> > +             xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET,
> > +                             state[0]);
> > +     if (((u32 *)changed)[1])
> > +             xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET +
> > +                             XGPIO_CHANNEL_OFFSET, state[1]);
> > +
> > +     spin_unlock(&chip->gpio_lock[1]);
> > +     spin_unlock_irqrestore(&chip->gpio_lock[0], flags);
> >  }
> >
> >  /**
> >
>
> Srinivas N: Can you please test this code?
>
> Thanks,
> Michal

Hey, any chance of getting that Tested-by?

Bart