35 lines
1.0 KiB
Diff
35 lines
1.0 KiB
Diff
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From 8e7e594b685f3fe44cd4803e3a4634bed897c2f7 Mon Sep 17 00:00:00 2001
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From: Zhang Ying-22455 <ying.zhang22455@nxp.com>
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Date: Fri, 14 Apr 2017 17:03:03 +0800
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Subject: [PATCH] i2c: imx: add workaround for erratum ERR010027
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ERR010027: Attempting a start cycle while the bus is busy may
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generate a short clock pulse.
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Software must ensure that the I2C BUS is idle by checking the
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bus busy before switching to master mode and attempting a Start
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cycle.
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Signed-off-by: Zhang Ying-22455 <ying.zhang22455@nxp.com>
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---
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drivers/i2c/busses/i2c-imx.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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--- a/drivers/i2c/busses/i2c-imx.c
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+++ b/drivers/i2c/busses/i2c-imx.c
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@@ -940,6 +940,14 @@ static int i2c_imx_xfer(struct i2c_adapt
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enable_runtime_pm = true;
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}
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+ /*
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+ * workround for ERR010027: ensure that the I2C BUS is idle
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+ * before switching to master mode and attempting a Start cycle
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+ */
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+ result = i2c_imx_bus_busy(i2c_imx, 0);
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+ if (result)
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+ goto out;
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+
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result = pm_runtime_get_sync(i2c_imx->adapter.dev.parent);
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if (result < 0)
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goto out;
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