diff options
| author | Sowjanya Komatineni <skomatineni@nvidia.com> | 2020-07-27 23:57:22 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2020-07-28 19:32:32 +0300 |
| commit | 0d722620986722208c6bc2a67f5d68aa73b7cd5f (patch) | |
| tree | 6eead590290d6df34b990d6679fae26fe5fd5d94 /drivers/i2c | |
| parent | 42aa38b54e35216351e52bb03382a38edc6f1bb8 (diff) | |
| download | linux-0d722620986722208c6bc2a67f5d68aa73b7cd5f.tar.xz | |
i2c: tegra: Fix runtime resume to re-init VI I2C
VI I2C is on host1x bus and is part of VE power domain.
During suspend/resume VE power domain goes through power off/on.
So, controller reset followed by i2c re-initialization is required
after the domain power up.
This patch fixes it.
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-tegra.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 7b93c454b4c7..1bf36669ca67 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -293,6 +293,8 @@ struct tegra_i2c_dev { bool is_curr_atomic_xfer; }; +static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit); + static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val, unsigned long reg) { @@ -675,8 +677,22 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev) goto disable_slow_clk; } + /* + * VI I2C device is attached to VE power domain which goes through + * power ON/OFF during PM runtime resume/suspend. So, controller + * should go through reset and need to re-initialize after power + * domain ON. + */ + if (i2c_dev->is_vi) { + ret = tegra_i2c_init(i2c_dev, true); + if (ret) + goto disable_div_clk; + } + return 0; +disable_div_clk: + clk_disable(i2c_dev->div_clk); disable_slow_clk: clk_disable(i2c_dev->slow_clk); disable_fast_clk: |