i2c: omap: ack IRQ in parts

According to flow diagrams on OMAP TRMs,
we should ACK the IRQ as they happen.

Signed-off-by: Felipe Balbi <balbi@ti.com>
[Ack the stat OMAP_I2C_STAT_AL in case of arbitration lost]
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 4045134..bac1f11 100644 (file)
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -850,21 +850,19 @@ omap_i2c_isr(int this_irq, void *dev_id)
                }
 
 complete:
-               /*
-                * 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)
+               if (stat & OMAP_I2C_STAT_NACK) {
                        err |= OMAP_I2C_STAT_NACK;
+                       omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK);
+                       omap_i2c_complete_cmd(dev, err);
+                       return IRQ_HANDLED;
+               }
 
                if (stat & OMAP_I2C_STAT_AL) {
                        dev_err(dev->dev, "Arbitration lost\n");
                        err |= OMAP_I2C_STAT_AL;
+                       omap_i2c_ack_stat(dev, OMAP_I2C_STAT_AL);
+                       omap_i2c_complete_cmd(dev, err);
+                       return IRQ_HANDLED;
                }
 
                /*
@@ -941,12 +939,18 @@ complete:
 
                if (stat & OMAP_I2C_STAT_ROVR) {
                        dev_err(dev->dev, "Receive overrun\n");
-                       dev->cmd_err |= OMAP_I2C_STAT_ROVR;
+                       err |= OMAP_I2C_STAT_ROVR;
+                       omap_i2c_ack_stat(dev, OMAP_I2C_STAT_ROVR);
+                       omap_i2c_complete_cmd(dev, err);
+                       return IRQ_HANDLED;
                }
 
                if (stat & OMAP_I2C_STAT_XUDF) {
                        dev_err(dev->dev, "Transmit underflow\n");
-                       dev->cmd_err |= OMAP_I2C_STAT_XUDF;
+                       err |= OMAP_I2C_STAT_XUDF;
+                       omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XUDF);
+                       omap_i2c_complete_cmd(dev, err);
+                       return IRQ_HANDLED;
                }
        } while (stat);