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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>
This commit is contained in:
Sowjanya Komatineni 2020-07-27 13:57:22 -07:00 committed by Wolfram Sang
parent 42aa38b54e
commit 0d72262098
1 changed files with 16 additions and 0 deletions
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16
drivers/i2c/busses/i2c-tegra.c
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@ -293,6 +293,8 @@ struct tegra_i2c_dev {
bool is_curr_atomic_xfer; 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, static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
unsigned long reg) unsigned long reg)
{ {
@ -675,8 +677,22 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
goto disable_slow_clk; 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; return 0;
disable_div_clk:
clk_disable(i2c_dev->div_clk);
disable_slow_clk: disable_slow_clk:
clk_disable(i2c_dev->slow_clk); clk_disable(i2c_dev->slow_clk);
disable_fast_clk: disable_fast_clk: