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author | Dmitry Osipenko <digetx@gmail.com> | 2020-09-30 01:18:48 +0300 |
---|---|---|
committer | Wolfram Sang <wsa@kernel.org> | 2020-10-05 22:57:40 +0200 |
commit | 8548a75f3e8d8d39c1f4ceca04c4febfa8eaa127 (patch) | |
tree | c4706d0639bec759733e066f60cae1b784c80be5 /drivers/i2c/busses/i2c-tegra.c | |
parent | ed022e5dd3a044b95a68d685d2d2871ce31351df (diff) | |
download | linux-stable-8548a75f3e8d8d39c1f4ceca04c4febfa8eaa127.tar.gz linux-stable-8548a75f3e8d8d39c1f4ceca04c4febfa8eaa127.tar.bz2 linux-stable-8548a75f3e8d8d39c1f4ceca04c4febfa8eaa127.zip |
i2c: tegra: Initialize div-clk rate unconditionally
It doesn't make sense to conditionalize the div-clk rate changes because
rate is fixed and it won't ever change once it's set at the driver's probe
time. All further changes are NO-OPs because CCF caches rate and skips
rate-change if rate is unchanged.
Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c/busses/i2c-tegra.c')
-rw-r--r-- | drivers/i2c/busses/i2c-tegra.c | 34 |
1 files changed, 16 insertions, 18 deletions
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 1d1ce266255a..720a75439e91 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -293,7 +293,7 @@ struct tegra_i2c_dev { bool is_curr_atomic_xfer; }; -static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit); +static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev); static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val, unsigned long reg) @@ -691,7 +691,7 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev) * domain ON. */ if (i2c_dev->is_vi) { - ret = tegra_i2c_init(i2c_dev, true); + ret = tegra_i2c_init(i2c_dev); if (ret) goto disable_div_clk; } @@ -778,7 +778,7 @@ static void tegra_i2c_vi_init(struct tegra_i2c_dev *i2c_dev) i2c_writel(i2c_dev, 0x0, I2C_TLOW_SEXT); } -static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit) +static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) { u32 val; int err; @@ -836,16 +836,14 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit) if (i2c_dev->hw->has_interface_timing_reg && tsu_thd) i2c_writel(i2c_dev, tsu_thd, I2C_INTERFACE_TIMING_1); - if (!clk_reinit) { - clk_multiplier = (tlow + thigh + 2); - clk_multiplier *= (i2c_dev->clk_divisor_non_hs_mode + 1); - err = clk_set_rate(i2c_dev->div_clk, - i2c_dev->bus_clk_rate * clk_multiplier); - if (err) { - dev_err(i2c_dev->dev, - "failed changing clock rate: %d\n", err); - return err; - } + clk_multiplier = tlow + thigh + 2; + clk_multiplier *= i2c_dev->clk_divisor_non_hs_mode + 1; + + err = clk_set_rate(i2c_dev->div_clk, + i2c_dev->bus_clk_rate * clk_multiplier); + if (err) { + dev_err(i2c_dev->dev, "failed to set div-clk rate: %d\n", err); + return err; } if (!i2c_dev->is_dvc && !i2c_dev->is_vi) { @@ -1319,7 +1317,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev, if (!time_left && !completion_done(&i2c_dev->dma_complete)) { dev_err(i2c_dev->dev, "DMA transfer timeout\n"); - tegra_i2c_init(i2c_dev, true); + tegra_i2c_init(i2c_dev); return -ETIMEDOUT; } @@ -1340,7 +1338,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev, if (time_left == 0) { dev_err(i2c_dev->dev, "i2c transfer timed out\n"); - tegra_i2c_init(i2c_dev, true); + tegra_i2c_init(i2c_dev); return -ETIMEDOUT; } @@ -1352,7 +1350,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev, if (likely(i2c_dev->msg_err == I2C_ERR_NONE)) return 0; - tegra_i2c_init(i2c_dev, true); + tegra_i2c_init(i2c_dev); /* start recovery upon arbitration loss in single master mode */ if (i2c_dev->msg_err == I2C_ERR_ARBITRATION_LOST) { if (!i2c_dev->is_multimaster_mode) @@ -1811,7 +1809,7 @@ static int tegra_i2c_probe(struct platform_device *pdev) if (ret < 0) goto disable_div_clk; - ret = tegra_i2c_init(i2c_dev, false); + ret = tegra_i2c_init(i2c_dev); if (ret) { dev_err(&pdev->dev, "Failed to initialize i2c controller\n"); goto release_dma; @@ -1918,7 +1916,7 @@ static int __maybe_unused tegra_i2c_resume(struct device *dev) if (err) return err; - err = tegra_i2c_init(i2c_dev, false); + err = tegra_i2c_init(i2c_dev); if (err) return err; |