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i2c: omap: Fix standard mode false ACK readings

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commit c770657bd2611b077ec1e7b1fe6aa92f249399bd upstream.

Using standard mode, rare false ACK responses were appearing with
i2cdetect tool. This was happening due to NACK interrupt triggering
ISR thread before register access interrupt was ready. Removing the
NACK interrupt's ability to trigger ISR thread lets register access
ready interrupt do this instead.

Cc: <[email protected]> # v3.7+
Fixes: 3b2f8f82da ("i2c: omap: switch to threaded IRQ support")
Signed-off-by: Reid Tonking <[email protected]>
Acked-by: Vignesh Raghavendra <[email protected]>
Reviewed-by: Tony Lindgren <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Reid Tonking 2023-04-26 14:49:56 -05:00 • committed by Greg Kroah-Hartman
commit 5d1f14beab
1 changed files with 1 additions and 1 deletions
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2
drivers/i2c/busses/i2c-omap.c
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@ -1058,7 +1058,7 @@ omap_i2c_isr(int irq, void *dev_id)
u16 stat;
stat = omap_i2c_read_reg(omap, OMAP_I2C_STAT_REG);
mask = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG);
mask = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG) & ~OMAP_I2C_STAT_NACK;
if (stat & mask)
ret = IRQ_WAKE_THREAD;