Alexander Shishkin said the following on 12/16/2009 07:32 PM:
This is to avoid insanely long lines and levels of indentation.
Signed-off-by: Alexander Shishkin <virtuoso@xxxxxxxxx>
CC: linux-i2c@xxxxxxxxxxxxxxx
CC: linux-omap@xxxxxxxxxxxxxxx
---
drivers/i2c/busses/i2c-omap.c | 43 ++++++++++++++++++++++------------------
1 files changed, 24 insertions(+), 19 deletions(-)
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 75bf3ad..ad8242a 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -671,6 +671,27 @@ omap_i2c_rev1_isr(int this_irq, void *dev_id)
#define omap_i2c_rev1_isr NULL
#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 omap3430_workaround(struct omap_i2c_dev *dev, u16 *stat, int *err)
note, though this is identified as being part of 3430, it is not really
restricted to 3430 alone
we might want to rename this as errata_omap3_1p153() perhaps?
+{
+ 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 -1;
+ }
+ cpu_relax();
+ *stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
+ }
+
+ return 0;
+}
wonder if using an inline might help throw away the function call
overhead (considering it is used only once)?
+
static irqreturn_t
omap_i2c_isr(int this_irq, void *dev_id)
{
@@ -794,25 +815,9 @@ complete:
break;
}
- /*
- * 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.
- */
-
- 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;
- }
- cpu_relax();
- stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
- }
- }
+ if (dev->rev <= OMAP_I2C_REV_ON_3430 &&
+ omap3430_workaround(dev, &stat, &err))
+ goto complete;
omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
}
Regards,
Nishanth Menon
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