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i2c: qcom-geni: Add shutdown callback for i2c 

[ Upstream commit 9f78c607600ce4f2a952560de26534715236f612 ]

If the hardware is still accessing memory after SMMU translation
is disabled (as part of smmu shutdown callback), then the
IOVAs (I/O virtual address) which it was using will go on the bus
as the physical addresses which will result in unknown crashes
like NoC/interconnect errors.

So, implement shutdown callback for i2c driver to suspend the bus
during system "reboot" or "shutdown".

Fixes: 37692de5d5 ("i2c: i2c-qcom-geni: Add bus driver for the Qualcomm GENI I2C controller")
Signed-off-by: Roja Rani Yarubandi <rojay@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Roja Rani Yarubandi 2021-05-25 18:40:50 +05:30 committed by Greg Kroah-Hartman
parent de37510ec6
commit 06f667dba4
1 changed files with 9 additions and 0 deletions
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9
drivers/i2c/busses/i2c-qcom-geni.c
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@ -641,6 +641,14 @@ static int geni_i2c_remove(struct platform_device *pdev)
return 0;
}
static void geni_i2c_shutdown(struct platform_device *pdev)
{
struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev);
/* Make client i2c transfers start failing */
i2c_mark_adapter_suspended(&gi2c->adap);
}
static int __maybe_unused geni_i2c_runtime_suspend(struct device *dev)
{
int ret;
@ -701,6 +709,7 @@ MODULE_DEVICE_TABLE(of, geni_i2c_dt_match);
static struct platform_driver geni_i2c_driver = {
.probe = geni_i2c_probe,
.remove = geni_i2c_remove,
.shutdown = geni_i2c_shutdown,
.driver = {
.name = "geni_i2c",
.pm = &geni_i2c_pm_ops,