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i2c-omap: Fix I2C status ACK

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I2C status ack for [RX]RDR and [RX]RDY could
cause race conditions of clearing the event
twice and a violation of the programing
sequence as defined in TRM This patch fixes
the same.

Signed-off-by: Nishanth Menon <[email protected]>
Signed-off-by: Moiz Sonasath <[email protected]>
Signed-off-by: Ben Dooks <[email protected]>
This commit is contained in:
Nishanth Menon 2009-08-20 11:21:14 -05:00 • committed by Ben Dooks
commit dcc4ec2694
1 changed files with 8 additions and 1 deletions
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9
drivers/i2c/busses/i2c-omap.c
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@ -674,7 +674,14 @@ omap_i2c_isr(int this_irq, void *dev_id)
err = 0;
complete:
omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
/*
* Ack the stat in one go, but [R/X]DR and [R/X]RDY should be
* acked after the data operation is complete.
* Ref: TRM SWPU114Q Figure 18-31
*/
omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat &
~(OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR |
OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
if (stat & OMAP_I2C_STAT_NACK) {
err |= OMAP_I2C_STAT_NACK;