Commit 2dd151ab authored by Alexander Shishkin's avatar Alexander Shishkin Committed by Ben Dooks

omap: i2c: make errata 1.153 workaround a separate function

This is to avoid insanely long lines and levels of indentation.
Signed-off-by: default avatarAlexander Shishkin <virtuoso@slind.org>
Cc: Nishant Menon <nm@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
parent 20c9d2c4
...@@ -756,6 +756,27 @@ omap_i2c_rev1_isr(int this_irq, void *dev_id) ...@@ -756,6 +756,27 @@ omap_i2c_rev1_isr(int this_irq, void *dev_id)
#define omap_i2c_rev1_isr NULL #define omap_i2c_rev1_isr NULL
#endif #endif
/*
* OMAP3430 Errata 1.153: When an XRDY/XDR is hit, wait for XUDF before writing
* data to DATA_REG. Otherwise some data bytes can be lost while transferring
* them from the memory to the I2C interface.
*/
static int errata_omap3_1p153(struct omap_i2c_dev *dev, u16 *stat, int *err)
{
while (!(*stat & OMAP_I2C_STAT_XUDF)) {
if (*stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) {
omap_i2c_ack_stat(dev, *stat & (OMAP_I2C_STAT_XRDY |
OMAP_I2C_STAT_XDR));
*err |= OMAP_I2C_STAT_XUDF;
return -ETIMEDOUT;
}
cpu_relax();
*stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
}
return 0;
}
static irqreturn_t static irqreturn_t
omap_i2c_isr(int this_irq, void *dev_id) omap_i2c_isr(int this_irq, void *dev_id)
{ {
...@@ -885,25 +906,9 @@ omap_i2c_isr(int this_irq, void *dev_id) ...@@ -885,25 +906,9 @@ omap_i2c_isr(int this_irq, void *dev_id)
break; break;
} }
/* if ((dev->rev <= OMAP_I2C_REV_ON_3430) &&
* OMAP3430 Errata 1.153: When an XRDY/XDR errata_omap3_1p153(dev, &stat, &err))
* is hit, wait for XUDF before writing data
* to DATA_REG. Otherwise some data bytes can
* be lost while transferring them from the
* memory to the I2C interface.
*/
if (dev->rev <= OMAP_I2C_REV_ON_3430) {
while (!(stat & OMAP_I2C_STAT_XUDF)) {
if (stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) {
omap_i2c_ack_stat(dev, stat & (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
err |= OMAP_I2C_STAT_XUDF;
goto complete; goto complete;
}
cpu_relax();
stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
}
}
omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
} }
......
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