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i2c: omap: Clear ARDY bit twice 

Initially commit cb527ede1b
"i2c-omap: Double clear of ARDY status in IRQ handler"
added a workaround for undocumented errata ProDB0017052.
But then commit 1d7afc9594
"i2c: omap: ack IRQ in parts" refactored code and missed
one of ARDY clearings. So current code violates errata.
It causes often i2c bus timeouts on my Pandaboard.

This patch adds a second clearing in place.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Taras Kondratiuk <taras.kondratiuk@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
This commit is contained in:
Taras Kondratiuk 2013-10-07 13:41:59 +03:00 committed by Wolfram Sang
parent 47b6e477ed
commit 4cdbf7d346
1 changed files with 3 additions and 0 deletions
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3
drivers/i2c/busses/i2c-omap.c
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@ -939,6 +939,9 @@ omap_i2c_isr_thread(int this_irq, void *dev_id)
/*
* ProDB0017052: Clear ARDY bit twice
*/
if (stat & OMAP_I2C_STAT_ARDY)
omap_i2c_ack_stat(dev, OMAP_I2C_STAT_ARDY);
if (stat & (OMAP_I2C_STAT_ARDY | OMAP_I2C_STAT_NACK |
OMAP_I2C_STAT_AL)) {
omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_RRDY |