Re: [PATCH v7 25/34] i2c: tegra: Factor out register polling into separate function

Thierry Reding
2020-09-21T11:22:34Z

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On Thu, Sep 17, 2020 at 06:05:41PM +0300, Dmitry Osipenko wrote:
> 17.09.2020 14:58, Thierry Reding пишет:
> > On Wed, Sep 09, 2020 at 01:39:57AM +0300, Dmitry Osipenko wrote:
> >> Factor out register polling into a separate function in order to remove
> >> boilerplate code and make code cleaner.
> >>
> >> Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> >> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> >> ---
> >> drivers/i2c/busses/i2c-tegra.c | 57 +++++++++++++++-------------------
> >> 1 file changed, 25 insertions(+), 32 deletions(-)
> >>
> >> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> >> index 405b87e28a98..e071de9ce106 100644
> >> --- a/drivers/i2c/busses/i2c-tegra.c
> >> +++ b/drivers/i2c/busses/i2c-tegra.c
> >> @@ -514,10 +514,24 @@ static void tegra_i2c_vi_init(struct tegra_i2c_dev *i2c_dev)
> >> i2c_writel(i2c_dev, 0x0, I2C_TLOW_SEXT);
> >> }
> >>
> >> +static int tegra_i2c_poll_register(struct tegra_i2c_dev *i2c_dev,
> >> + u32 reg, u32 mask, u32 delay_us,
> >> + u32 timeout_us)
> >> +{
> >> + void __iomem *addr = i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg);
> >> + u32 val;
> >> +
> >> + if (!i2c_dev->is_curr_atomic_xfer)
> >> + return readl_relaxed_poll_timeout(addr, val, !(val & mask),
> >> + delay_us, timeout_us);
> >> +
> >> + return readl_relaxed_poll_timeout_atomic(addr, val, !(val & mask),
> >> + delay_us, timeout_us);
> >> +}
> >> +
> >> static int tegra_i2c_flush_fifos(struct tegra_i2c_dev *i2c_dev)
> >> {
> >> - u32 mask, val, offset, reg_offset;
> >> - void __iomem *addr;
> >> + u32 mask, val, offset;
> >> int err;
> >>
> >> if (i2c_dev->hw->has_mst_fifo) {
> >> @@ -534,16 +548,7 @@ static int tegra_i2c_flush_fifos(struct tegra_i2c_dev *i2c_dev)
> >> val |= mask;
> >> i2c_writel(i2c_dev, val, offset);
> >>
> >> - reg_offset = tegra_i2c_reg_addr(i2c_dev, offset);
> >> - addr = i2c_dev->base + reg_offset;
> >> -
> >> - if (i2c_dev->is_curr_atomic_xfer)
> >> - err = readl_relaxed_poll_timeout_atomic(addr, val, !(val & mask),
> >> - 1000, 1000000);
> >> - else
> >> - err = readl_relaxed_poll_timeout(addr, val, !(val & mask),
> >> - 1000, 1000000);
> >> -
> >> + err = tegra_i2c_poll_register(i2c_dev, offset, mask, 1000, 1000000);
> >> if (err) {
> >> dev_err(i2c_dev->dev, "failed to flush FIFO\n");
> >> return err;
> >> @@ -553,30 +558,18 @@ static int tegra_i2c_flush_fifos(struct tegra_i2c_dev *i2c_dev)
> >>
> >> static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev)
> >> {
> >> - unsigned long reg_offset;
> >> - void __iomem *addr;
> >> - u32 val;
> >> int err;
> >>
> >> - if (i2c_dev->hw->has_config_load_reg) {
> >> - reg_offset = tegra_i2c_reg_addr(i2c_dev, I2C_CONFIG_LOAD);
> >> - addr = i2c_dev->base + reg_offset;
> >> - i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD);
> >> + if (!i2c_dev->hw->has_config_load_reg)
> >> + return 0;
> >>
> >> - if (i2c_dev->is_curr_atomic_xfer)
> >> - err = readl_relaxed_poll_timeout_atomic(
> >> - addr, val, val == 0, 1000,
> >> - I2C_CONFIG_LOAD_TIMEOUT);
> >> - else
> >> - err = readl_relaxed_poll_timeout(
> >> - addr, val, val == 0, 1000,
> >> - I2C_CONFIG_LOAD_TIMEOUT);
> >> + i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD);
> >>
> >> - if (err) {
> >> - dev_warn(i2c_dev->dev,
> >> - "timeout waiting for config load\n");
> >> - return err;
> >> - }
> >> + err = tegra_i2c_poll_register(i2c_dev, I2C_CONFIG_LOAD, 0xffffffff,
> >> + 1000, I2C_CONFIG_LOAD_TIMEOUT);
> >> + if (err) {
> >> + dev_warn(i2c_dev->dev, "timeout waiting for config load\n");
> >> + return err;
> >> }
> >
> > The deindentation in this hunk is messing up the diffstat in my opinion.
> > It would probably be worth splitting that into a separate patch to make
> > it more evident that this patch actually removes boilerplate.
>
> This is intentional and it's mentioned in the v7 changelog.
>
> Previously there was another patch that did what you're suggesting, but
> Andy Shevchenko objected that it was causing a "ping-pong" code changes
> where one patch did a change and then next patch changes the changed
> code again.

Hm... alright then:

Reviewed-by: Thierry Reding <treding@nvidia.com>

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